WO2008011834A1 - A sending and receiving method, device based on ofdm - Google Patents

A sending and receiving method, device based on ofdm Download PDF

Info

Publication number
WO2008011834A1
WO2008011834A1 PCT/CN2007/070325 CN2007070325W WO2008011834A1 WO 2008011834 A1 WO2008011834 A1 WO 2008011834A1 CN 2007070325 W CN2007070325 W CN 2007070325W WO 2008011834 A1 WO2008011834 A1 WO 2008011834A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
module
channel
signals
orthogonal
Prior art date
Application number
PCT/CN2007/070325
Other languages
French (fr)
Chinese (zh)
Inventor
Bin Li
Meng Zhao
Lixia Xue
Yi Luo
Yinggang Du
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008011834A1 publication Critical patent/WO2008011834A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/26035—Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences

Definitions

  • the present invention relates to Orthogonal Frequency Division Multiplexing (OFDM) signal transmission technology in the field of mobile communications, and in particular, to a method and apparatus for transmitting and receiving based on orthogonal frequency division multiplexing.
  • OFDM Orthogonal Frequency Division Multiplexing
  • Cellular technology is a wireless mobile communication technology that divides a geographic area into a number of cells, called “cells.”
  • Mobile phones or mobile phones use this technology and are often referred to as cellular phones.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM is a multi-carrier digital modulation technology. Unlike conventional single-carrier technology, such as Amplitude Modulation/Frequency Modulation (AM/FM), a single signal is transmitted at a single frequency. OFDM is in Multiple high-speed signals are simultaneously transmitted on a specially calculated orthogonal frequency. OFDM, in turn, is a multiplexing technique that multiplexes multiple signals onto different orthogonal subcarriers.
  • AM/FM Amplitude Modulation/Frequency Modulation
  • OFDM uses the data to be transmitted as frequency domain information, modulates it into a time domain signal, and transmits it on the channel, and performs inverse process demodulation at the receiving end.
  • the modulation and demodulation of the OFDM system can be replaced by an Inverse Discrete Fourier Transform (IDFT) and a Discrete Fourier Transform (DFT), respectively.
  • IDFT Inverse Discrete Fourier Transform
  • DFT Discrete Fourier Transform
  • Passing N point IDFT The operation converts the frequency domain data symbols into time domain data symbols, and after carrier modulation, is sent to the channel.
  • the received signal is coherently demodulated, and then the baseband signal is subjected to an N-point DFT operation to obtain a transmitted data symbol.
  • IDFT/DFT is implemented by Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT).
  • FIG. 1 it is a schematic diagram of signal transmission in the reverse control channel of the OFDM system in the prior art.
  • control channel signal such as a channel quality indicator (CQI) 10-bit signal
  • CQI channel quality indicator
  • first perform HADAMA D mapping that is, select one of the 1024x1024 HADAMARD orthogonal matrices or
  • a 1024-bit long WALSH (Walsh) code is obtained, which is then scrambled by a scrambling code. This scrambling is to distinguish other channels, so the scrambling codes of different channels are different.
  • the scrambled WALSH codes of different channels are added and combined.
  • the combined 1024 bits are further scrambled to distinguish between different users, cells or sectors.
  • each sub-block contains 128 bits, and then 128-point FFT transform is performed for each sub-block, 128 complex values are output, and the resulting 1024 complex values are OFDM-based. It is carried on 128 subcarriers and 8 symbols.
  • the inventors have found that the above prior art solutions have the following problems in the implementation of the present invention:
  • the spread spectrum signals such as WALSH codes
  • the main reason for the above situation is that due to the inherent frequency selective fading of OFDM systems and the inherent time-selective fading in mobile communications, different subcarriers are degraded at different times at different times, which leads to the transmission of control channels.
  • the 1024-bit long WALSH orthogonal code that is transmitted is no longer orthogonal at the receiving end, so that the receiver's reception performance to the control channel is greatly degraded.
  • the present invention provides a method and apparatus for transmitting and receiving based on orthogonal frequency division multiplexing, so that an OFDM-based transceiver system has stronger anti-interference capability, and can improve orthogonality of a spread spectrum signal received by a receiving end.
  • the present invention provides a transmission method based on orthogonal frequency division multiplexing, including: dividing a signal to be transmitted into at least two groups of signals; mapping each of the groups of signals to an orthogonal code; Each orthogonal code is preprocessed on the transmitting side and then transmitted.
  • the present invention also provides a receiving method based on orthogonal frequency division multiplexing, comprising the steps of: performing receiving side preprocessing on a received signal, and recovering a channel signal including a plurality of orthogonal codes therefrom;
  • the channel signals of the plurality of orthogonal codes are grouped according to the orthogonal code length when the transmitting end performs mapping, and the joint orthogonal code correlation processing and error correction decoding are performed based on the grouped signals after the grouping.
  • the present invention further provides a transmitting device based on orthogonal frequency division multiplexing, comprising: a first grouping module, configured to divide a signal to be transmitted into at least two groups of signals; and a mapping module, configured to use the first grouping module Each of the output signals is mapped to an orthogonal code.
  • the transmitting side pre-processing module is configured to perform pre-processing on the transmitting side of each orthogonal code output by the mapping module.
  • the present invention also provides a receiving apparatus based on orthogonal frequency division multiplexing, comprising: a receiving side preprocessing module, configured to perform receiving side preprocessing on the received signal, and recover a channel including multiple orthogonal codes therefrom. a second packet module, configured to group the signal including the multiple orthogonal codes into orthogonal code lengths mapped by the transmitting end; and a correlation processing and decoding module, configured to: after the grouped signals Perform joint orthogonal code correlation processing and error correction decoding.
  • a receiving side preprocessing module configured to perform receiving side preprocessing on the received signal, and recover a channel including multiple orthogonal codes therefrom.
  • a second packet module configured to group the signal including the multiple orthogonal codes into orthogonal code lengths mapped by the transmitting end
  • a correlation processing and decoding module configured to: after the grouped signals Perform joint orthogonal code correlation processing and error correction decoding.
  • the signals to be transmitted are grouped, so that The length of each group of signals after grouping is smaller than the original length of the signal to be transmitted, and the length of one orthogonal code mapped to each group of signals is correspondingly shorter, and the time-frequency block occupied by the OFDM signal corresponding to each orthogonal code is also It is small, so it effectively resists the frequency selective fading and time selective fading inherent in the OFDM system, thereby improving the orthogonality of the spread spectrum signals received at the receiving end.
  • FIG. 1 is a schematic diagram of signal transmission in a reverse control channel of an OFDM system in the prior art
  • FIG. 2 is a flowchart of a transmission method based on an OFDM system according to a first embodiment of the present invention
  • FIG. 3 is a first embodiment of the present invention. Schematic diagram of a transmission method based on an OFDM system
  • FIG. 4 is a flowchart of a receiving method based on an OFDM system according to a first embodiment of the present invention
  • FIG. 5 is a schematic diagram of a receiving method based on an OFDM system according to a first embodiment of the present invention
  • FIG. 6 is a schematic diagram showing the principle of a transmission method based on an OFDM system according to a second embodiment of the present invention.
  • FIG. 7 is a schematic diagram showing the principle of a receiving method based on an OFDM system according to a second embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing the principle of a transmission method based on an OFDM system using other coding modes according to a second embodiment of the present invention.
  • FIG. 9 is a schematic diagram showing the principle of an OFDM system-based receiving method using other coding modes according to a second embodiment of the present invention.
  • FIG. 10 is a structural diagram of a transmitting and receiving apparatus based on an OFDM system according to a third embodiment of the present invention.
  • FIG. 11 is a diagram of a transmitting and receiving apparatus based on an OFDM system according to a fourth embodiment of the present invention. Composition.
  • the transmitting end performs error correction coding on the signal of a predetermined length, so that the transmitted signal has a certain gain in quality, and then groups the encoded signals to ensure the signal length of each group. Less than the original predetermined length, so that each group of coded signals is mapped to the orthogonal code, a shorter orthogonal code is obtained, and each orthogonal code is transmitted on consecutive time-frequency blocks of the OFDM system. Thereby, the frequency selective fading and time selective fading inherent in the OFDM system are avoided, and the orthogonal codes received by the receiving end are still orthogonal, which improves the reliability of information transmission.
  • the transmission and reception methods based on the OFDM system of the first embodiment of the present invention will be described in detail below.
  • the transmission method based on the OFDM system of the present embodiment is as shown in FIG. 2.
  • Step 201 The transmitting end performs channel error correction coding on a predetermined length of the to-be-transmitted signal in each channel, and the error correction coding used may be a REED-MULLER ("RM") code, a Hamming code, or a BCH. Code and so on.
  • RM REED-MULLER
  • FIG. 3 is a schematic diagram of a principle of a transmission method based on an OFDM system according to a first embodiment of the present invention.
  • the transmitting end has 10 bits of signals to be transmitted in each of the plurality of channels, the 10-bit signals to be transmitted in each channel are respectively subjected to channel error correction coding.
  • the transmitting end uses the "REED - MULLER" code for channel error correction coding on the 10 bit signals to be transmitted in the CQI channel, and the encoder outputs 32 bits.
  • the other channels are to be transmitted.
  • the 10-bit signal is encoded in the same way, resulting in 32 bits of the encoder output.
  • the transmitted signal is obtained by performing channel error correction coding on a signal of a predetermined length to be transmitted. There is a certain gain in quality, which improves transmission reliability.
  • the transmitting end groups the encoded coded signals in each channel, and the length of each group of coded signals is less than a predetermined length.
  • the CQI channel is also taken as an example.
  • the transmitting end divides the 32-bit encoded signals in the CQI channel into four groups, and each group of encoded signals has a length of 8 bits. Similarly, 32 bits of other channels are similarly The coded signals are divided into 4 groups.
  • the transmitting end maps each group of coded signals of each channel into an orthogonal code, such as a Walsh code.
  • step 204 the transmitting end scrambles and combines the mapped signal and the pilot signal of each channel with corresponding channel scrambling codes.
  • the transmitting end scrambles 1024 bits in each channel with corresponding channel scrambling codes, and different control channels use different scrambling codes to distinguish the control channels. For example, 1024 bits in the CQI channel are scrambled with the scrambling code of the CQI channel to obtain 1024 bits after scrambling.
  • the transmitting end combines the signals scrambled by the channel scrambling code in each channel to obtain 1024 bit signals.
  • the transmitting end scrambles the combined signal with a cell scrambling code. Specifically, as shown in Figure 3.
  • the transmitting side scrambles the combined 1024 bit signals with a cell scrambling code to distinguish different cells or sectors.
  • step 206 the transmitting end performs DFT transformation on the signal scrambled by the cell scrambling code, Usually implemented by FFT transform.
  • the transmitting end modulates the DFT-converted signal into an OFDM signal transmission, where the OFDM signal corresponding to each orthogonal code is transmitted on consecutive time-frequency blocks.
  • the transmitting end may divide the 1024-bit signal scrambled by the cell scrambling code into 8 sub-blocks before performing DFT conversion on the signal, so that each sub-block contains 128 bits, continuously.
  • the two sub-blocks correspond to a Walsh orthogonal code.
  • the 1024 A total of 8 OFDM symbols are required for transmission of bit information. For example, if an OFDM system has a total of 512 subcarriers, then the OFDM signal modulated by the 8 subblocks is mapped to 128 subcarriers of the 512 subcarriers and transmitted through 8 OFDM symbols. It should be noted that two consecutive sub-blocks corresponding to each Walsh code need to be transmitted on consecutive subcarriers and consecutive OFDM symbols.
  • the processing performed after the packet is mapped to an orthogonal code by the transmitting end includes, but is not limited to, the manner shown in the above steps 204 to 207, for example, when there is only one channel to be transmitted. In this case, there are no relevant steps for the merge. Therefore, the processing process after the packet mapping may be collectively referred to as the pre-processing process on the transmitting side, and may be implemented in various specific manners according to the actual situation, and is not limited to the manner shown in steps 204 to 207 in this embodiment. .
  • a 10-bit signal in a CQI channel is mapped to obtain a 1024-bit orthogonal code.
  • a 10-bit signal in a CQI channel is error-correction-coded to obtain 32 bits.
  • each group of coded signals has only 8 bits after being grouped, each orthogonal code obtained after mapping has only 256 bits.
  • each orthogonal code is shorter in length, and each The OFDM signal corresponding to the orthogonal code is transmitted on consecutive subcarriers and consecutive OFDM symbols, thereby effectively avoiding the frequency selective fading inherent in the OFDM system and the time selective fading inherent in mobile communication, thereby ensuring reception.
  • the orthogonal codes in each channel received by the terminal are still orthogonal, thereby effectively avoiding mutual interference between users and achieving better reception quality, especially for high-speed mobile user equipment, and the improvement of reception quality is more remarkable.
  • the transmitting end may also divide the 1024 bit signals into 16 sub-blocks, each sub-block contains 64 bits, and the consecutive 4 sub-blocks correspond to a 256-long Walsh code, and the transmitting end only needs to guarantee one corresponding to one.
  • the OFDM signal of the Walsh code is transmitted on consecutive subcarriers and consecutive OFDM symbols, so as to avoid the selective fading of frequency and time inherent in the OFDM system.
  • the receiving method corresponding to the first embodiment of the above-described OFDM system-based transmission method is as shown in FIG.
  • Step 401 The receiving end demodulates the received OFDM signal.
  • the receiving end performs IDFT conversion on the demodulated signal.
  • FIG. 5 is a schematic diagram of the principle of the OFDM system-based receiving method according to the first embodiment of the present invention.
  • the receiving end extracts the samples on the 128 subcarriers in each OFDM symbol, and performs IDFT transformation on them, and collects 8 symbols in total, that is, a total of 1024 bits are obtained.
  • the receiving end de-interfers the IDFT-converted signal with a cell scrambling code. Specifically, the receiving end distinguishes the signals of the respective cells by multiplying the obtained 1024 bit signals by conjugate multiplexing of the cell scrambling codes.
  • the receiving end performs descrambling on the descrambling sequence by using the channel scrambling code. Specifically, as shown in FIG. 5, the receiving end further decodes the signal descrambled by the cell scrambling code by using a channel scrambling code. The channel signal of each channel is obtained.
  • the receiving end groups the channel signals descrambled by the channel scrambling code by the orthogonal code length mapped by the transmitting end. For the above case, since the length of each Walsh code mapped in the transmitting end is 256, the receiving end groups the 1024 bit signals of each channel obtained by descrambling the channel scrambling code into groups of 256 bits each. , get 4 sets of signals.
  • step 406 the receiving end performs correlation processing and error correction decoding of each group of signals to obtain a decoding result. Specifically, for each channel, the receiver is at all possible decoding junctions.
  • the transmitting end may also perform channel error correction coding on the transmission signal, and directly group and map the signals to be transmitted. Therefore, if the transmitting end does not perform channel error correction coding on the signal to be transmitted, then when the receiving end finds the sequence with the largest value as the decoding result, the
  • the possible decoding result is the mth bit of the orthogonal code corresponding to the kth group signal obtained by the same packet as the transmitting end, and A is the number of signal groups.
  • the essence is a certain channel letter.
  • steps 401 to 404 can also be understood as a receiving side of steps 401 to 404 shown in this embodiment.
  • the purpose of the transmission side pre-processing is to recover a channel signal comprising a plurality of orthogonal codes from the received signal, thereby providing a desired signal for subsequent processing of the packet and the orthogonal code.
  • the second embodiment of the present invention is substantially the same as the first embodiment in the transmission and reception method based on the OFDM system, except that in the first embodiment, the transmitting end only scrambles the signals of the respective control channels with corresponding channels. After the scrambling and combining, in the embodiment, the transmitting end scrambles the pilot signal with the pilot channel scrambling code, and scrambles the scrambled pilot signal and the channel scrambling code of each control channel.
  • the signals are combined, as shown in FIG. 6, which is a schematic diagram of a transmission method based on an OFDM system according to a second embodiment of the present invention.
  • the channel scrambling code to descramble at the receiving end The obtained pilot signal is subjected to channel estimation, and the other channel signals are coherently demodulated according to the obtained channel estimation, and then the coherently demodulated signals of the other channels are separately grouped and orthogonal code correlated.
  • the steps of processing and error correction decoding are as shown in FIG. Wherein, when the receiving end performs the correlation processing and the error correction decoding of the orthogonal code, in all possible decoding result sequences, find the corresponding sequence with the largest value of the ⁇ , the sequence Output as a decoding result.
  • x k , m is
  • the mth bit of the kth group signal, 3 ⁇ 4m is the mth bit of the orthogonal code corresponding to the kth group signal encoded and grouped by the same way as the transmitting end, and Re represents the real part , * represents the conjugate, m is the channel estimate, A is the number of coded signals, and B is the length of the orthogonal code.
  • the transmitting end scrambles the pilot signal, and combines the scrambled pilot signal with the scrambled signal of each channel, so that the receiving end can perform the pilot signal obtained after the descrambling.
  • Channel estimation, and coherent demodulation based on the obtained evaluation results, further improves the reception quality.
  • the 3 ⁇ 4m is the mth of the orthogonal code corresponding to the kth group signal obtained by the same packet as the transmitting end.
  • Bits, A is the number of signal groups.
  • the encoded signal in each channel is not necessarily 32 bits, and is not necessarily divided into four. group. Assuming that the encoded signal is mxn bits and is divided into m groups, the transmission mode and the reception mode are as shown in FIG. 8 and FIG. 9, respectively, wherein when m is 4, n is 8; when m is 8, n is 7; When m is 16, n is 6.
  • a third embodiment of the present invention is based on an embodiment of a transmitting apparatus and a receiving apparatus of an OFDM system, as shown in FIG.
  • the encoding module 110 is configured to perform error correction coding on the signal to be transmitted of a predetermined length, and output the signal;
  • the first grouping module 120 is configured to output the signal of the encoding module.
  • the scrambling module 140, the mapped orthogonal codes of the channels output by the mapping module are scrambled and outputted by the corresponding channel scrambling code, and the merging module 150 is configured to scramble the first scrambling module.
  • the signals of the subsequent channels are combined and output;
  • the second scrambling module 160 is configured to perform scrambling on the signal output by the merging module, and output the signal;
  • the DFT transform module 170 is configured to use the second scrambling module.
  • the output signal is subjected to DFT conversion and output; the modulation module 180 is configured to modulate the signal output by the DFT transform module into an OFDM signal and output the signal; and the transmitting module 190 is configured to send the OFDM signal output by the modulation module.
  • the sending module 190 transmits the OFDM signal corresponding to each orthogonal code on consecutive time-frequency blocks.
  • the transmitting end may not perform channel error correction encoding before the packet, and therefore the encoding module 110 may not be included in the transmitting end.
  • the first scrambling module 140, the merging module 150, the second scrambling module 160, the DFT transform module 170, the modulating module 180, and the sending module 190 can be summarized as a transmitting side preprocessing module, and the specific part of the sending side preprocessing module Implementations include, but are not limited to, the aforementioned internal structures.
  • the receiving device includes a receiving module 210 for receiving an OFDM signal, a demodulating module 220, configured to demodulate and output the OFDM signal received by the receiving module, and an IDFT transform module 230, configured to output the demodulation module.
  • the signal is subjected to IDFT conversion and output;
  • the second descrambling module 240 is configured to descramble the signal output by the IDFT transform module by using a cell scrambling code;
  • the first descrambling module 250 is configured to: the second descrambling module
  • the output signal is descrambled and outputted by the channel scrambling code;
  • the second grouping module 260 is configured to group the signals output by the first descrambling module according to the orthogonal code length mapped by the transmitting end, and output the same; 270.
  • the group of signals output by the second grouping module are subjected to orthogonal code correlation processing and error correction decoding, and then output.
  • the receiving module 210, the demodulating module 220, the IDFT transform module 230, the second descrambling module 240, and the first descrambling module 250 may be summarized as a receiving side preprocessing module, and the receiving The side pre-processing module provides the second grouping module 260 with its required channel signal including a plurality of orthogonal codes, and specific implementations of the receiving-side pre-processing module include, but are not limited to, the aforementioned internal structure.
  • the correlation processing and decoding module 270 is specifically configured to find out in all possible sequences of decoding results.
  • the transmitting and receiving apparatus based on the OFDM system of the fourth embodiment of the present invention is substantially the same as that of the third embodiment, as shown in FIG. 11, except that in the transmitting apparatus, the first scrambling module 140 is also used for the pair.
  • the pilot signal is scrambled by the pilot channel scrambling code
  • the combining module 150 combines the signals of the channels scrambled by the first scrambling module 140 and the pilot signals, and outputs the signals to the DFT transform module 170.
  • a channel estimation module 290 and a decoherence module 280 are added.
  • the channel estimation module 290 is configured to perform channel estimation according to the pilot signal obtained after descrambling by the first descrambling module 250.
  • the decohering module 280 is configured to use the estimated value obtained by the channel estimation module 290 for each channel signal. Coherent demodulation is performed and output to the second grouping module 260. The coherently demodulated channel signals are grouped by the second grouping module 260 according to the orthogonal code length mapped by the transmitting end, and then output to the correlation processing and error correction decoding module 270 . Receiving device by including a pilot signal in a signal transmitted by the transmitting device The channel estimation can be performed according to the pilot signal obtained after descrambling, and coherent demodulation is adopted according to the obtained estimation result, thereby further improving the reception quality.
  • the transmitting apparatus 110 may not be provided in the transmitting apparatus.
  • the receiving module 210, the demodulating module 220, the IDFT transform module 230, the second descrambling module 240, and the first descrambling module 250, the channel estimating module 290, and the decoherence module 280 in the receiving device may be summarized as the receiving side. Preprocessing module.
  • each orthogonal code mapped is correspondingly shorter, and thus each The OFDM signal corresponding to the orthogonal code occupies a small time-frequency block, so it effectively resists the frequency selective fading and time-selective fading inherent in the OFDM system, thereby improving the spread spectrum signal received by the receiving end (eg, Orthogonality of orthogonal codes).
  • the signal has a large gain in transmission quality.
  • the transmitting end distinguishes the transmission signals of the plurality of channels by scrambling the channel scrambling code, and distinguishes the transmission signals of the different cells by the scrambling of the cell scrambling code, thereby effectively utilizing the spectrum resources.
  • the transmitting end performs scrambling on the pilot signal, and combines the scrambled pilot signal with the scrambled signal of each channel, and the receiving end performs channel estimation according to the descrambled pilot signal.
  • the value, and coherent demodulation based on the obtained evaluation result further improves the reception quality.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Power Engineering (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Error Detection And Correction (AREA)

Abstract

A signal-sending method based on OFDM is disclosed and it includes: Divide signal into two parts at least. Map each part of the signal into an orthogonal code. Make pre-disposal to the orthogonal code and then send it out. Additionally, a signal-receiving method based on OFDM is also disclosed and it includes: Make pre-disposal to the received signal and recover channel signals including orthogonal code. Divide these channel signals into several parts according to mapping rule which is used as the signal is sent. Make corresponding disposal and error correction code decoding to these parts in combination. At the same time, a sending and receiving device based on OFDM is disclosed also. The sending and receiving system based on OFDM according to this invention wins stronger anti-jamming ability by improving the orthogonality among received spreading signal.

Description

基于正交频分复用的收发方法及装置  Transceiver method and device based on orthogonal frequency division multiplexing
本申请要求于 2006 年 7 月 19 日提交中国专利局、 申请号为 200610106627.0、 发明名称为"基于正交频分复用的收发方法及***"的中国专 利申请的优先权， 其全部内容通过引用结合在本申请中。  This application claims priority to Chinese Patent Application No. 200610106627.0, entitled "Transmission Method and System Based on Orthogonal Frequency Division Multiplexing", filed on July 19, 2006, the entire contents of which are hereby incorporated by reference. Combined in this application.
技术领域 Technical field
本发明涉及移动通信领域中的正交频分复用 （ Orthogonal Frequency Division Multiplexing, 简称' OFDM" )信号传输技术， 尤其涉及一种基于正交 频分复用的收发方法及装置。  The present invention relates to Orthogonal Frequency Division Multiplexing (OFDM) signal transmission technology in the field of mobile communications, and in particular, to a method and apparatus for transmitting and receiving based on orthogonal frequency division multiplexing.
背景技术 Background technique
蜂窝技术是一种无线移动通信技术，这种技术把一个地理区域分成若干个 小区， 称作"蜂窝" (cell)。 手机 (或移动电话)均采用这项技术， 因此常常被称作 蜂窝电话 (cellular phone)。在蜂窝移动通信***中，以正交频分复用（ Orthogonal Frequency Division Multiplexing, 简称' OFDM" )为代表的多载波技术收到了 广泛的关注。  Cellular technology is a wireless mobile communication technology that divides a geographic area into a number of cells, called "cells." Mobile phones (or mobile phones) use this technology and are often referred to as cellular phones. In the cellular mobile communication system, the multi-carrier technology represented by Orthogonal Frequency Division Multiplexing (OFDM) has received extensive attention.
OFDM作为一种多载波数字调制技术， 不像常规的单载波技术， 如调幅 / 调频（ Amplitude Modulation/Frequency Modulation, 简称" AM/FM" )在某一时 刻只用单一频率发送单一信号， OFDM在经过特别计算的正交频率上同时发 送多路高速信号。 OFDM又作为一种复用技术， 将多路信号复用在不同的正 交子载波上。  OFDM is a multi-carrier digital modulation technology. Unlike conventional single-carrier technology, such as Amplitude Modulation/Frequency Modulation (AM/FM), a single signal is transmitted at a single frequency. OFDM is in Multiple high-speed signals are simultaneously transmitted on a specially calculated orthogonal frequency. OFDM, in turn, is a multiplexing technique that multiplexes multiple signals onto different orthogonal subcarriers.
OFDM将待传输数据作为频域信息， 将其调制为时域信号， 并在信道上 传输， 而在接收端则进行逆过程解调。 OFDM ***的调制和解调可以分别由 逆离散傅立叶变换 ( Inverse Discrete Fourier Transform, 简称 "IDFT" )和离散 傅立叶变换 ( Discrete Fourier Transform, 简称" DFT" )来代替。通过 N点 IDFT 运算， 把频域数据符号变换为时域数据符号， 经过载波调制之后， 发送到信道 中。 在接收端， 将接收信号进行相干解调， 然后将基带信号进行 N点 DFT运 算， 即可获得发送的数据符号。 在实际应用中， IDFT/DFT采用逆快速傅立叶 变换 ( Inverse Fast Fourier Transform, 简称 "IFFT" )和快速傅立叶变换 ( Fast Fourier Transform , 简称" FFT" )来实现。 OFDM uses the data to be transmitted as frequency domain information, modulates it into a time domain signal, and transmits it on the channel, and performs inverse process demodulation at the receiving end. The modulation and demodulation of the OFDM system can be replaced by an Inverse Discrete Fourier Transform (IDFT) and a Discrete Fourier Transform (DFT), respectively. Passing N point IDFT The operation converts the frequency domain data symbols into time domain data symbols, and after carrier modulation, is sent to the channel. At the receiving end, the received signal is coherently demodulated, and then the baseband signal is subjected to an N-point DFT operation to obtain a transmitted data symbol. In practical applications, IDFT/DFT is implemented by Inverse Fast Fourier Transform (IFFT) and Fast Fourier Transform (FFT).
为了提高低速率信号例如控制信号的通信效率， 现有技术中有一种采用 1024比特长的 WALSH码（沃尔什码）映射的方案。 以图 1为例， 其为现有 技术中 OFDM***反向控制信道中的信号传输示意图。  In order to improve the communication efficiency of low-rate signals such as control signals, there is a scheme in the prior art that uses a 1024-bit long WALSH code (Walsh code) mapping. Taking FIG. 1 as an example, it is a schematic diagram of signal transmission in the reverse control channel of the OFDM system in the prior art.
对于每个控制信道的信号， 如信道质量指示 （ Channel Quality Indicator, 简称" CQI" ) 的 10比特信号， 首先进行 HADAMA D (哈达玛）映射， 即从 1024x1024的 HADAMARD正交矩阵中选择其中一行或一列 , 得到一个 1024 比特长的 WALSH (沃尔什）码， 该 WALSH码再被一个扰码加扰。 本次加扰 是为了区别其它信道， 因而不同信道的扰码是不一样的。 然后， 将不同信道的 被加扰的 WALSH码进行相加合并。 合并后的 1024比特进一步被加扰， 该扰 码是用于区别不同的用户， 蜂窝小区或扇区。 加扰后输出的 1024比特被分成 8个子块， 每个子块含 128个比特， 再对每个子块进行 128点的 FFT变换， 输 出 128个复数值，最后得到的 1024个复数值以 OFDM方式被携带在 128个子 载波和 8个符号上发送。  For each control channel signal, such as a channel quality indicator (CQI) 10-bit signal, first perform HADAMA D mapping, that is, select one of the 1024x1024 HADAMARD orthogonal matrices or In one column, a 1024-bit long WALSH (Walsh) code is obtained, which is then scrambled by a scrambling code. This scrambling is to distinguish other channels, so the scrambling codes of different channels are different. Then, the scrambled WALSH codes of different channels are added and combined. The combined 1024 bits are further scrambled to distinguish between different users, cells or sectors. The 1024 bits output after scrambling are divided into 8 sub-blocks, each sub-block contains 128 bits, and then 128-point FFT transform is performed for each sub-block, 128 complex values are output, and the resulting 1024 complex values are OFDM-based. It is carried on 128 subcarriers and 8 symbols.
发明人在实现本发明过程中发现，上述现有技术方案存在以下问题： 通过 OFDM***传输信号时， 无法保证接收端收到的扩频信号（如 WALSH码 )依 然正交,传输的可靠性得不到保障。造成上述情况的主要原因在于，由于 OFDM ***存在固有的频率选择性衰落 , 以及移动通信中存在固有的时间选择性衰 落，使得不同子载波在不同时间产生不同幅度的衰弱，进而使得控制信道所传 输的 1024比特长的 WALSH正交码在接收端不再正交， 从而使得接收机对控 制信道的接收性能大大下降。 The inventors have found that the above prior art solutions have the following problems in the implementation of the present invention: When transmitting signals through the OFDM system, there is no guarantee that the spread spectrum signals (such as WALSH codes) received by the receiving end are still orthogonal, and the reliability of the transmission is obtained. Not guaranteed. The main reason for the above situation is that due to the inherent frequency selective fading of OFDM systems and the inherent time-selective fading in mobile communications, different subcarriers are degraded at different times at different times, which leads to the transmission of control channels. The 1024-bit long WALSH orthogonal code that is transmitted is no longer orthogonal at the receiving end, so that the receiver's reception performance to the control channel is greatly degraded.
发明内容 本发明提供一种基于正交频分复用的收发方法及装置， 使得基于 OFDM 的收发***具有更强的抗干扰能力 ,能够提高接收端接收到的扩频信号的正交 性。 SUMMARY OF THE INVENTION The present invention provides a method and apparatus for transmitting and receiving based on orthogonal frequency division multiplexing, so that an OFDM-based transceiver system has stronger anti-interference capability, and can improve orthogonality of a spread spectrum signal received by a receiving end.
本发明提供了一种基于正交频分复用的发送方法， 包括： 将待传输信号分 为至少两组信号； 将所述每组信号各映射到一个正交码； 将所述映射后的各正 交码进行发送侧预处理后发送。  The present invention provides a transmission method based on orthogonal frequency division multiplexing, including: dividing a signal to be transmitted into at least two groups of signals; mapping each of the groups of signals to an orthogonal code; Each orthogonal code is preprocessed on the transmitting side and then transmitted.
本发明还提供了一种基于正交频分复用的接收方法， 包含以下步骤： 对接 收到的信号进行接收侧预处理，从中恢复出包括多个正交码的信道信号； 将所 述包括多个正交码的信道信号按发送端进行映射时的正交码长度进行分组，并 基于所述分组后的各组信号进行联合的正交码相关处理和纠错译码。  The present invention also provides a receiving method based on orthogonal frequency division multiplexing, comprising the steps of: performing receiving side preprocessing on a received signal, and recovering a channel signal including a plurality of orthogonal codes therefrom; The channel signals of the plurality of orthogonal codes are grouped according to the orthogonal code length when the transmitting end performs mapping, and the joint orthogonal code correlation processing and error correction decoding are performed based on the grouped signals after the grouping.
本发明还提供了一种基于正交频分复用的发送装置，包含：第一分组模块， 用于将待传输信号分为至少两组信号； 映射模块， 用于将所述第一分组模块输 出的每组信号各映射到一个正交码；发送侧预处理模块， 用于将所述映射模块 输出的各正交码进行发送侧预处理后发送。  The present invention further provides a transmitting device based on orthogonal frequency division multiplexing, comprising: a first grouping module, configured to divide a signal to be transmitted into at least two groups of signals; and a mapping module, configured to use the first grouping module Each of the output signals is mapped to an orthogonal code. The transmitting side pre-processing module is configured to perform pre-processing on the transmitting side of each orthogonal code output by the mapping module.
本发明还提供了一种基于正交频分复用的接收装置， 包括：接收侧预处理 模块， 用于对接收到的信号进行接收侧预处理，从中恢复出包括多个正交码的 信道信号； 第二分组模块， 用于将所述包括多个正交码的信号按发送端映射的 正交码长度进行分组；相关处理及译码模块， 用于将所述分组后的各组信号进 行联合的正交码相关处理和纠错译码。  The present invention also provides a receiving apparatus based on orthogonal frequency division multiplexing, comprising: a receiving side preprocessing module, configured to perform receiving side preprocessing on the received signal, and recover a channel including multiple orthogonal codes therefrom. a second packet module, configured to group the signal including the multiple orthogonal codes into orthogonal code lengths mapped by the transmitting end; and a correlation processing and decoding module, configured to: after the grouped signals Perform joint orthogonal code correlation processing and error correction decoding.
根据以上本发明技术方案可以看出， 由于对待传输信号进行了分组，使得 分组后的每组信号长度小于待传输信号的原长度，进而每组信号各映射到的一 个正交码长度也相应地较短 , 每个正交码所对应的 OFDM信号占用的时频块 也就较小， 因此有效的抵抗了 OFDM***固有的频率选择性衰落与时间选择 性衰落， 进而能够提高接收端接收到的扩频信号的正交性。 According to the technical solution of the present invention, it can be seen that the signals to be transmitted are grouped, so that The length of each group of signals after grouping is smaller than the original length of the signal to be transmitted, and the length of one orthogonal code mapped to each group of signals is correspondingly shorter, and the time-frequency block occupied by the OFDM signal corresponding to each orthogonal code is also It is small, so it effectively resists the frequency selective fading and time selective fading inherent in the OFDM system, thereby improving the orthogonality of the spread spectrum signals received at the receiving end.
附图说明 DRAWINGS
图 1是现有技术中 OFDM***反向控制信道中的信号传输示意图； 图 2是根据本发明第一实施方式的基于 OFDM***的发送方法流程图； 图 3是根据本发明第一实施方式的基于 OFDM***的发送方法原理示意 图；  1 is a schematic diagram of signal transmission in a reverse control channel of an OFDM system in the prior art; FIG. 2 is a flowchart of a transmission method based on an OFDM system according to a first embodiment of the present invention; FIG. 3 is a first embodiment of the present invention. Schematic diagram of a transmission method based on an OFDM system;
图 4是根据本发明第一实施方式的基于 OFDM***的接收方法流程图； 图 5是根据本发明第一实施方式的基于 OFDM***的接收方法原理示意 图；  4 is a flowchart of a receiving method based on an OFDM system according to a first embodiment of the present invention; FIG. 5 is a schematic diagram of a receiving method based on an OFDM system according to a first embodiment of the present invention;
图 6是根据本发明第二实施方式的基于 OFDM***的发送方法原理示意 图；  6 is a schematic diagram showing the principle of a transmission method based on an OFDM system according to a second embodiment of the present invention;
图 7是根据本发明第二实施方式的基于 OFDM***的接收方法原理示意 图；  7 is a schematic diagram showing the principle of a receiving method based on an OFDM system according to a second embodiment of the present invention;
图 8是根据本发明第二实施方式中采用其他编码方式的基于 OFDM*** 的发送方法原理示意图；  8 is a schematic diagram showing the principle of a transmission method based on an OFDM system using other coding modes according to a second embodiment of the present invention;
图 9是根据本发明第二实施方式中采用其他编码方式的基于 OFDM*** 的接收方法原理示意图；  9 is a schematic diagram showing the principle of an OFDM system-based receiving method using other coding modes according to a second embodiment of the present invention;
图 10是根据本发明第三实施方式的基于 OFDM***的发送、接收装置结 构图；  10 is a structural diagram of a transmitting and receiving apparatus based on an OFDM system according to a third embodiment of the present invention;
图 11是根据本发明第四实施方式的基于 OFDM***的发送、接收装置结 构图。 11 is a diagram of a transmitting and receiving apparatus based on an OFDM system according to a fourth embodiment of the present invention. Composition.
具体实施方式 detailed description
为使本发明实施例的目的、技术方案和优点更加清楚， 下面将结合附图对 本发明各实施例作进一步地伴细描述。  The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
在本发明的一个实施例中， 发送端通过将预定长度的信号先进行纠错编 码， 使得所传输的信号在质量上有一定的增益， 再将编码后的信号分组， 保证 每组的信号长度小于原先的预定长度，从而使得每组编码信号在映射到正交码 后， 得到一个较短的的正交码， 并且将每一个正交码在 OFDM***的连续的 时频块上进行发送， 从而避免了 OFDM***固有的频率选择性衰落与时间选 择性衰落，保证了接收端所接收到的正交码仍然正交，提高了信息传输的可靠 性。  In an embodiment of the present invention, the transmitting end performs error correction coding on the signal of a predetermined length, so that the transmitted signal has a certain gain in quality, and then groups the encoded signals to ensure the signal length of each group. Less than the original predetermined length, so that each group of coded signals is mapped to the orthogonal code, a shorter orthogonal code is obtained, and each orthogonal code is transmitted on consecutive time-frequency blocks of the OFDM system. Thereby, the frequency selective fading and time selective fading inherent in the OFDM system are avoided, and the orthogonal codes received by the receiving end are still orthogonal, which improves the reliability of information transmission.
下面对本发明的第一实施方式基于 OFDM***的发送与接收方法进行详 细阐述。 本实施方式的基于 OFDM***的发送方法如图 2所示。  The transmission and reception methods based on the OFDM system of the first embodiment of the present invention will be described in detail below. The transmission method based on the OFDM system of the present embodiment is as shown in FIG. 2.
步骤 201 : 发送端将各信道中预定长度的待传输信号分别进行信道纠错编 码， 采用的纠错编码可以为里德 -米勒（ REED - MULLER, 简称" RM" )码、 汉明码或 BCH码等等。  Step 201: The transmitting end performs channel error correction coding on a predetermined length of the to-be-transmitted signal in each channel, and the error correction coding used may be a REED-MULLER ("RM") code, a Hamming code, or a BCH. Code and so on.
具体而言， 请结合参看图 3， 其是根据本发明第一实施方式的基于 OFDM ***的发送方法原理示意图。 发送端在多个信道中各有 10比特的待传输信号 时， 将各信道中待传输的 10比特信号分别进行信道纠错编码。 以 CQI信道为 例， 发送端对 CQI信道中待传输的 10个比特信号采用 "REED - MULLER"码 进行信道纠错编码， 编码器输出 32个比特， 同样的， 对其他各信道中待传输 的 10比特信号采用相同的方式进行编码，得到编码器输出的 32个比特。在本 步骤中，通过对预定长度的待传输信号进行信道纠错编码，使得所传输的信号 在质量上有一定的增益， 提高了传输可靠性。 Specifically, please refer to FIG. 3, which is a schematic diagram of a principle of a transmission method based on an OFDM system according to a first embodiment of the present invention. When the transmitting end has 10 bits of signals to be transmitted in each of the plurality of channels, the 10-bit signals to be transmitted in each channel are respectively subjected to channel error correction coding. Taking the CQI channel as an example, the transmitting end uses the "REED - MULLER" code for channel error correction coding on the 10 bit signals to be transmitted in the CQI channel, and the encoder outputs 32 bits. Similarly, the other channels are to be transmitted. The 10-bit signal is encoded in the same way, resulting in 32 bits of the encoder output. In this step, the transmitted signal is obtained by performing channel error correction coding on a signal of a predetermined length to be transmitted. There is a certain gain in quality, which improves transmission reliability.
接着， 进入步骤 202: 发送端将各信道中经编码后的编码信号分组， 每组 编码信号的长度小于预定长度。 针对上述案例， 同样以 CQI信道为例， 发送 端将 CQI信道中的 32比特的编码信号分为 4组， 每组编码信号的长度为 8比 特， 类似地， 同样将其他各信道的 32比特的编码信号分别分为 4组。  Next, proceeding to step 202: the transmitting end groups the encoded coded signals in each channel, and the length of each group of coded signals is less than a predetermined length. For the above case, the CQI channel is also taken as an example. The transmitting end divides the 32-bit encoded signals in the CQI channel into four groups, and each group of encoded signals has a length of 8 bits. Similarly, 32 bits of other channels are similarly The coded signals are divided into 4 groups.
接着， 进入步骤 203: 发送端将各信道的各组编码信号分别映射到一个正 交码中， 如 Walsh码。  Next, proceeding to step 203: the transmitting end maps each group of coded signals of each channel into an orthogonal code, such as a Walsh code.
具体而言， 如图 3所示。 同样以 CQI信道为例， 发送端将 CQI信道的各 组编码信号分别映射到一个 Walsh码中。 由于每组编码信号的长度为 8比特， 因此一组编码信号映射后得到一个长度为 28，即 256比特的 Walsh码。 也就是 说， 每一个信道中共得到 4x256=1024个比特的信号（每个信道中有 4组编码 信号）， 其中包含了 4个 Walsh码，每个 Walsh码的长度为 256比特。 Specifically, as shown in FIG. Similarly, taking the CQI channel as an example, the transmitting end maps each group of coded signals of the CQI channel to a Walsh code. Since each group of encoded signals has a length of 8 bits, a set of encoded signals is mapped to obtain a Walsh code having a length of 28 , that is, 256 bits. That is to say, a total of 4x256=1024 bits of signals (four sets of coded signals in each channel) are obtained in each channel, which includes four Walsh codes, each of which has a length of 256 bits.
接着， 进入步骤 204: 发送端将各信道的经映射后的信号和导频信号以相 应的信道扰码进行加扰后合并。  Next, proceeding to step 204: the transmitting end scrambles and combines the mapped signal and the pilot signal of each channel with corresponding channel scrambling codes.
具体而言， 如图 3所示。 发送端对每一个信道中的 1024个比特以相应的 信道扰码进行加扰， 不同的控制信道采用不同的扰码以便区别各控制信道。 比 如说， 对 CQI信道中的 1024个比特以 CQI信道的扰码进行加扰， 得到加扰后 的 1024个比特。 发送端将各信道中经信道扰码加扰后的信号合并， 得到 1024 个比特信号。  Specifically, as shown in Figure 3. The transmitting end scrambles 1024 bits in each channel with corresponding channel scrambling codes, and different control channels use different scrambling codes to distinguish the control channels. For example, 1024 bits in the CQI channel are scrambled with the scrambling code of the CQI channel to obtain 1024 bits after scrambling. The transmitting end combines the signals scrambled by the channel scrambling code in each channel to obtain 1024 bit signals.
接着， 进入步骤 205， 发送端将合并后的信号以小区扰码进行加扰。 具体 而言，如图 3所示。发送端对合并后的 1024个比特信号以小区扰码进行加扰， 以便区别不同的蜂窝小区或扇区。  Next, proceeding to step 205, the transmitting end scrambles the combined signal with a cell scrambling code. Specifically, as shown in Figure 3. The transmitting side scrambles the combined 1024 bit signals with a cell scrambling code to distinguish different cells or sectors.
接着， 进入步骤 206: 发送端对经小区扰码加扰后的信号进行 DFT变换， 通常可通过 FFT变换实现。 Next, proceed to step 206: the transmitting end performs DFT transformation on the signal scrambled by the cell scrambling code, Usually implemented by FFT transform.
接着， 进入步骤 207: 发送端将经 DFT变换后的信号调制为 OFDM信号 发送， 其中， 每一个正交码所对应的 OFDM信号在连续的时频块上发送。 具 体而言， 针对上述案例， 发送端可在对信号进行 DFT变换前， 先将经小区扰 码加扰后的 1024个比特的信号划分为 8个子块，使每个子块包含 128个比特， 连续的两个子块对应一个 Walsh正交码。 并在对 8个子块的共 1024个比特信 号进行 DFT变换后， 将这 8个子块所包含的 1024个比特信号调制为 OFDM 信号， 映射到一个 OFDM***的 128个子载波上进行传输， 所述 1024个比特 信息共需要 8个 OFDM符号来传输。 比如说， 一个 OFDM***共有 512个子 载波， 那么， 发送端将由这 8个子块所调制成的 OFDM信号映射到这 512个 子载波中的 128个子载波上， 并通过 8个 OFDM符号进行发送。 需要说明的 是， 与每个 Walsh码所对应的连续的两个子块需要在连续的子载波与连续的 OFDM符号上发送。  Next, proceeding to step 207: the transmitting end modulates the DFT-converted signal into an OFDM signal transmission, where the OFDM signal corresponding to each orthogonal code is transmitted on consecutive time-frequency blocks. Specifically, for the above case, the transmitting end may divide the 1024-bit signal scrambled by the cell scrambling code into 8 sub-blocks before performing DFT conversion on the signal, so that each sub-block contains 128 bits, continuously. The two sub-blocks correspond to a Walsh orthogonal code. And performing DFT transform on a total of 1024 bit signals of 8 sub-blocks, modulating 1024 bit signals included in the 8 sub-blocks into OFDM signals, and mapping to 128 sub-carriers of an OFDM system for transmission, the 1024 A total of 8 OFDM symbols are required for transmission of bit information. For example, if an OFDM system has a total of 512 subcarriers, then the OFDM signal modulated by the 8 subblocks is mapped to 128 subcarriers of the 512 subcarriers and transmitted through 8 OFDM symbols. It should be noted that two consecutive sub-blocks corresponding to each Walsh code need to be transmitted on consecutive subcarriers and consecutive OFDM symbols.
本领域技术人员可以理解，在发送端将分组后的信号各映射到一个正交码 以后进行的处理， 包括但不限上述步骤 204至 207所示方式， 例如， 当只有一 个信道有待传输信号的情况下， 便不存在合并的相关步骤。 因此， 可以将分组 映射后的处理过程统称为发送侧预处理过程，在该过程中可以根据实际情况采 用多种具体方式予以实现，而不局限于本实施方式中的步骤 204至 207所示方 式。  A person skilled in the art can understand that the processing performed after the packet is mapped to an orthogonal code by the transmitting end includes, but is not limited to, the manner shown in the above steps 204 to 207, for example, when there is only one channel to be transmitted. In this case, there are no relevant steps for the merge. Therefore, the processing process after the packet mapping may be collectively referred to as the pre-processing process on the transmitting side, and may be implemented in various specific manners according to the actual situation, and is not limited to the manner shown in steps 204 to 207 in this embodiment. .
在现有技术中 , CQI信道中的 10比特信号经映射后得到一个 1024个比特 的正交码， 而在本实施方式中， CQI信道中的 10比特信号虽经纠错编码后得 到 32个比特， 但由于经分组后， 每组编码信号只有 8比特， 因此， 映射后得 到的每个正交码只有 256比特。 而且， 由于每一个正交码长度较短， 而且每个 正交码所对应的 OFDM信号在连续的子载波与连续的 OFDM符号上进行发 送， 因此有效避免了 OFDM***固有的频率选择性衰落， 以及移动通信中固 有的时间选择性衰落 ,从而保证了接收端所接收到的各信道中的正交码仍然正 交， 进而有效避免了用户间的相互干扰， 达到了更好的接收质量， 尤其对于高 速移动的用户设备， 接收质量的提高更为显著。 In the prior art, a 10-bit signal in a CQI channel is mapped to obtain a 1024-bit orthogonal code. In the present embodiment, a 10-bit signal in a CQI channel is error-correction-coded to obtain 32 bits. However, since each group of coded signals has only 8 bits after being grouped, each orthogonal code obtained after mapping has only 256 bits. Moreover, since each orthogonal code is shorter in length, and each The OFDM signal corresponding to the orthogonal code is transmitted on consecutive subcarriers and consecutive OFDM symbols, thereby effectively avoiding the frequency selective fading inherent in the OFDM system and the time selective fading inherent in mobile communication, thereby ensuring reception. The orthogonal codes in each channel received by the terminal are still orthogonal, thereby effectively avoiding mutual interference between users and achieving better reception quality, especially for high-speed mobile user equipment, and the improvement of reception quality is more remarkable.
需要说明的是，发送端也可以将 1024个比特信号划分为 16个子块，每个 子块包含 64个比特， 连续的 4个子块对应于一个 256长的 Walsh码， 发送端 只需保证对应于一个 Walsh码的 OFDM信号在连续的子载波与连续的 OFDM 符号上发送， 即可达到避免 OFDM***固有的频率与时间的选择性衰落的目 的。  It should be noted that the transmitting end may also divide the 1024 bit signals into 16 sub-blocks, each sub-block contains 64 bits, and the consecutive 4 sub-blocks correspond to a 256-long Walsh code, and the transmitting end only needs to guarantee one corresponding to one. The OFDM signal of the Walsh code is transmitted on consecutive subcarriers and consecutive OFDM symbols, so as to avoid the selective fading of frequency and time inherent in the OFDM system.
上述基于 OFDM***的发送方法第一实施方式对应的接收方法如图 4所 示。  The receiving method corresponding to the first embodiment of the above-described OFDM system-based transmission method is as shown in FIG.
步骤 401: 接收端将接收到的 OFDM信号进行解调。  Step 401: The receiving end demodulates the received OFDM signal.
接着， 进入步骤 402: 接收端将解调后的信号进行 IDFT转换。 针对上述 案例， 具体请结合参看图 5, 其为根据本发明第一实施方式的基于 OFDM系 统的接收方法原理示意图。 接收端在每个 OFDM符号里提取其中 128个子载 波上的样值， 并对它们进行 IDFT变换， 共收集 8个符号， 即总共得到 1024 个比特。  Next, proceed to step 402: The receiving end performs IDFT conversion on the demodulated signal. For the above case, please refer to FIG. 5 in detail, which is a schematic diagram of the principle of the OFDM system-based receiving method according to the first embodiment of the present invention. The receiving end extracts the samples on the 128 subcarriers in each OFDM symbol, and performs IDFT transformation on them, and collects 8 symbols in total, that is, a total of 1024 bits are obtained.
接着， 进入步骤 403: 接收端将经 IDFT变换后的信号以小区扰码进行解 扰。 具体地说， 接收端通过将得到的 1024个比特信号进行小区扰码的共轭相 乘， 区分出各个小区的信号。  Next, proceeding to step 403: The receiving end de-interfers the IDFT-converted signal with a cell scrambling code. Specifically, the receiving end distinguishes the signals of the respective cells by multiplying the obtained 1024 bit signals by conjugate multiplexing of the cell scrambling codes.
接着， 进入步骤 404: 接收端再对解扰的序列以信道扰码进行解扰。 具体 而言，如图 5所示，接收端将经小区扰码解扰的信号进一步以信道扰码进行解 扰， 得到各信道的信道信号。 Then, proceeding to step 404: the receiving end performs descrambling on the descrambling sequence by using the channel scrambling code. Specifically, as shown in FIG. 5, the receiving end further decodes the signal descrambled by the cell scrambling code by using a channel scrambling code. The channel signal of each channel is obtained.
接着， 进入步骤 405 : 接收端将经信道扰码解扰后的信道信号按发送端映 射的正交码长度进行分组。针对上述案例， 由于在发送端中映射的各 Walsh码 长度为 256 , 因此， 接收端将经信道扰码解扰后得到的各信道的 1024个比特 信号按每组长度为 256比特的方式进行分组， 得到 4组信号。  Next, proceeding to step 405: the receiving end groups the channel signals descrambled by the channel scrambling code by the orthogonal code length mapped by the transmitting end. For the above case, since the length of each Walsh code mapped in the transmitting end is 256, the receiving end groups the 1024 bit signals of each channel obtained by descrambling the channel scrambling code into groups of 256 bits each. , get 4 sets of signals.
接着， 进入步骤 406: 接收端将各组信号进行正交码的相关处理和纠错译 码， 得到译码结果。 具体地说， 对于每一个信道， 接收端在所有可能的译码结  Next, proceeding to step 406: the receiving end performs correlation processing and error correction decoding of each group of signals to obtain a decoding result. Specifically, for each channel, the receiver is at all possible decoding junctions.
2  2
果序列中， 找出所对应的 £ £ ¾WW 值最大的序列， 将该序列作为译码结 k=l m=\ 果输出。 其中， xk,m 为第 k组信号的第 m个比特， ¾m 为可能的译码结果经 与发送端相同的方式编码和分组后的第 k组信号所对应的正交码的第 m个比 特， A为编码信号组数， B为正交码的长度。 In the sequence, find the corresponding sequence with the largest £ £ 3⁄4 W W value, and output the sequence as the decoding knot k=lm=\. Where x k , m is the mth bit of the kth group of signals, and 3⁄4m is the mth of the orthogonal code corresponding to the kth group of signals encoded and grouped in the same manner as the transmitting end Bit, A is the number of coded signal groups, and B is the length of the orthogonal code.
针对上述案例， 如果接收端得到的 CQI 信道的 4 组信号分别为  For the above case, if the four signals of the CQI channel obtained by the receiving end are
•^j 1？ 2 " · " 256 , 1？ 2 " · ·， ^2 256 , ^3 1？ 2 " · " 256 ^4 1？ 2 " · " 256 ' >^^_^^^·^Ι¾· ^目 1^1 的方式对可能的译码结果进行编码后，得到 再以与发送端相同的方 式对 进行分组， 分组后得到的 4 组相应的正交码为 Wl l,Wl 2,...,w1 256 , w2 1,w2 2,...,w2 256 , w3 1 ,w3 2,...,w3 256 ^ w4 1,w4 2,...,w4 256 , 那么， 在所有可能的译码结 •^j 1? 2 " · " 256 , 1? 2 " · ·, ^2 256 , ^3 1? 2 " · " 256 ^4 1? 2 " · " 256 '>^^_^^^·^Ι3⁄4· ^目1^1 The way to possible translation After the code results are encoded, they are grouped in the same way as the sender, and the corresponding orthogonal codes obtained after grouping are Wl l , Wl 2 , ..., w 1 256 , w 2 1 , w 2 2 ,...,w 2 256 , w 3 1 ,w 3 2 ,...,w 3 256 ^ w 4 1 ,w 4 2 ,...,w 4 256 , then, in all possible translations Code knot
4 256 4 256
果中找出的所对应的 值最大的一个序列， 该序列即为发送端的 The largest sequence of values found in the result, which is the sender's
k=l  k=l
CQI信道的译码结果。 The decoding result of the CQI channel.
需要说明的是，由于发送端对待传输信号进行信道纠错编码的目的在于提 高传输可靠性，因此，如果只从提高接收端接收到的正交码的正交性角度考虑， 发送端也可以不对待传输信号进行信道纠错编码，而直接将待传输信号进行 组以及映射。 因此对应的， 如果发送端没有对待传输信号进行信道纠错编码， 那么接收端在找出 值最大的序列作为译码结果时，所述 为
Figure imgf000012_0001
It should be noted that the purpose of performing channel error correction coding on the signal to be transmitted by the transmitting end is to improve the transmission reliability. Therefore, if only the orthogonality of the orthogonal code received by the receiving end is considered, The transmitting end may also perform channel error correction coding on the transmission signal, and directly group and map the signals to be transmitted. Therefore, if the transmitting end does not perform channel error correction coding on the signal to be transmitted, then when the receiving end finds the sequence with the largest value as the decoding result, the
Figure imgf000012_0001
可能的译码结果经与发送端相同的分组后得到的第 k组信号所对应的正交码 的第 m个比特， A为信号组数。 根据步骤 406中描述的 ¾w 可以看出，其实质是对某个信道信 The possible decoding result is the mth bit of the orthogonal code corresponding to the kth group signal obtained by the same packet as the transmitting end, and A is the number of signal groups. As can be seen from the 3⁄4 w described in step 406, the essence is a certain channel letter.
m=\ 号被分组后的各组信号联合起来进行检测， 才能找到需要的译码结果， 即进行 联合的正交码相关处理和纠错译码。  The grouped signals of m=\ are combined and detected to find the required decoding result, that is, the joint orthogonal code correlation processing and error correction decoding are performed.
此外 ,在介绍发送端时提到 ,当进行分组并映射到正交码之后的处理过程 , 可以理解为发送侧预处理过程，而该过程的具体实现方式可以根据实际情况而 定。 因此对应的， 在接收端， 也可以将步骤 401至步骤 404理解为一种接收侧 于本实施方式所示的步骤 401至步骤 404。 发送侧预处理的目的在于， 从接收 到的信号中恢复出包括多个正交码的信道信号，从而为后续分组以及进行正交 码的相关处理和纠错译码提供所需的信号。  In addition, when the sender is introduced, it is mentioned that the processing after the grouping and mapping to the orthogonal code can be understood as the sending side pre-processing, and the specific implementation of the process can be determined according to the actual situation. Therefore, correspondingly, at the receiving end, steps 401 to 404 can also be understood as a receiving side of steps 401 to 404 shown in this embodiment. The purpose of the transmission side pre-processing is to recover a channel signal comprising a plurality of orthogonal codes from the received signal, thereby providing a desired signal for subsequent processing of the packet and the orthogonal code.
本发明的第二实施方式基于 OFDM***的发送与接收方法与第一实施方 式大致相同， 其区别仅在于， 在第一实施方式中， 发送端仅将各控制信道的信 号以相应的信道扰码加扰后合并， 而在本实施方式中，发送端还将导频信号以 导频信道扰码进行加扰，并将加扰后的导频信号与各控制信道的经信道扰码加 扰后的信号进行合并， 如图 6 所示， 其是根据本发明第二实施方式的基于 OFDM ***的发送方法原理示意图。 相应的， 在接收端使用经信道扰码解扰 后得到的导频信号进行信道估值，并根据所得到的信道估值对其它各信道信号 进行相干解调，再对其它各信道经相干解调后的信号分别进行分组、正交码的 相关处理和纠错译码的步骤， 如图 7所示。 其中， 接收端在进行正交码的相关 处理和纠错译码时， 在所有可能的译码结果序列中， 找出所对应的 ^ίέ¾»^，》Λ^值最大的序列， 将该序列作为译码结果输出。 其中， xk,m 为 The second embodiment of the present invention is substantially the same as the first embodiment in the transmission and reception method based on the OFDM system, except that in the first embodiment, the transmitting end only scrambles the signals of the respective control channels with corresponding channels. After the scrambling and combining, in the embodiment, the transmitting end scrambles the pilot signal with the pilot channel scrambling code, and scrambles the scrambled pilot signal and the channel scrambling code of each control channel. The signals are combined, as shown in FIG. 6, which is a schematic diagram of a transmission method based on an OFDM system according to a second embodiment of the present invention. Correspondingly, using the channel scrambling code to descramble at the receiving end The obtained pilot signal is subjected to channel estimation, and the other channel signals are coherently demodulated according to the obtained channel estimation, and then the coherently demodulated signals of the other channels are separately grouped and orthogonal code correlated. The steps of processing and error correction decoding are as shown in FIG. Wherein, when the receiving end performs the correlation processing and the error correction decoding of the orthogonal code, in all possible decoding result sequences, find the corresponding sequence with the largest value of the ^^έ^^, the sequence Output as a decoding result. Where x k , m is
J  J
第 k组信号的第 m个比特， ¾m 为可能的译码结果经与发送端相同的方式编 码和分组后的第 k组信号所对应的正交码的第 m个比特, Re代表取实数部分， *代表取共轭， m为所述信道估值， A为编码信号组数， B为正交码的长度。 由于发送端对导频信号进行了加扰，并将加扰后的导频信号与各信道的经 加扰后的信号进行合并后发送 ,使得接收端能根据解扰后得到的导频信号进行 信道估值， 并根据得到的估值结果采用相干解调， 进一步提高了接收质量。 同 理，如果发送端在进行分组之前没有进行信道纠错编码， 那么所述 ¾m 为可能 的译码结果经与发送端相同的分组后得到的第 k组信号所对应的正交码的第 m个比特， A为信号组数。 The mth bit of the kth group signal, 3⁄4m is the mth bit of the orthogonal code corresponding to the kth group signal encoded and grouped by the same way as the transmitting end, and Re represents the real part , * represents the conjugate, m is the channel estimate, A is the number of coded signals, and B is the length of the orthogonal code. The transmitting end scrambles the pilot signal, and combines the scrambled pilot signal with the scrambled signal of each channel, so that the receiving end can perform the pilot signal obtained after the descrambling. Channel estimation, and coherent demodulation based on the obtained evaluation results, further improves the reception quality. Similarly, if the transmitting end does not perform channel error correction coding before performing the packet, the 3⁄4m is the mth of the orthogonal code corresponding to the kth group signal obtained by the same packet as the transmitting end. Bits, A is the number of signal groups.
需要说明的是，由于在发送端中可使用各种编码方式对各信道的待传输信 号进行纠错编码， 因此， 各信道中经编码后的信号并非一定为 32比特， 也并 非一定分为 4组。 假设编码后的信号为 mxn比特， 分为 m组， 则发送方式与 接收方式分别如图 8和图 9所示，其中， m为 4时， n为 8; m为 8时， n为 7; m为 16时， n为 6。  It should be noted that, since the signal to be transmitted of each channel can be error-corrected and encoded in various manners in the transmitting end, the encoded signal in each channel is not necessarily 32 bits, and is not necessarily divided into four. group. Assuming that the encoded signal is mxn bits and is divided into m groups, the transmission mode and the reception mode are as shown in FIG. 8 and FIG. 9, respectively, wherein when m is 4, n is 8; when m is 8, n is 7; When m is 16, n is 6.
本发明的第三实施方式基于 OFDM***的发送装置与接收装置实施例， 如图 10所示。 在发送装置中， 包含编码模块 110, 用于将预定长度的待传输 信号进行纠错编码后输出； 第一分组模块 120, 用于将该编码模块输出的信号 分为至少两组编码信号后输出 ,每组的长度小于所述预定长度； 130映射模块， 用于将该第一分组模块输出的每组编码信号各映射到一个正交码后输出；第一 加扰模块 140， 将该映射模块输出的各信道的经映射所得的各正交码以相应的 信道扰码进行加扰后输出； 合并模块 150， 用于将经该第一加扰模块加扰后的 各信道的信号合并后输出； 第二加扰模块 160, 用于将该合并模块输出的信号 以小区扰码进行加扰后输出； DFT变换模块 170， 用于将该第二加扰模块输出 的信号进行 DFT变换后输出； 调制模块 180, 用于将该 DFT变换模块输出的 信号调制为 OFDM信号后输出； 发送模块 190, 用于发送该调制模块输出的 OFDM信号。 其中， 发送模块 190将每个正交码所对应的 OFDM信号在连续 的时频块上进行发送。 A third embodiment of the present invention is based on an embodiment of a transmitting apparatus and a receiving apparatus of an OFDM system, as shown in FIG. In the transmitting device, the encoding module 110 is configured to perform error correction coding on the signal to be transmitted of a predetermined length, and output the signal; the first grouping module 120 is configured to output the signal of the encoding module. Dividing into at least two sets of coded signals and outputting, the length of each set is less than the predetermined length; 130 mapping module, configured to map each set of coded signals output by the first grouping module to an orthogonal code and output; The scrambling module 140, the mapped orthogonal codes of the channels output by the mapping module are scrambled and outputted by the corresponding channel scrambling code, and the merging module 150 is configured to scramble the first scrambling module. The signals of the subsequent channels are combined and output; the second scrambling module 160 is configured to perform scrambling on the signal output by the merging module, and output the signal; the DFT transform module 170 is configured to use the second scrambling module. The output signal is subjected to DFT conversion and output; the modulation module 180 is configured to modulate the signal output by the DFT transform module into an OFDM signal and output the signal; and the transmitting module 190 is configured to send the OFDM signal output by the modulation module. The sending module 190 transmits the OFDM signal corresponding to each orthogonal code on consecutive time-frequency blocks.
与本发明发送方法实施例同理， 发送端可以不在分组前进行信道纠错编 码， 因此发送端中也可以不包括编码模块 110。 并且可以将第一加扰模块 140、 合并模块 150、 第二加扰模块 160、 DFT变换模块 170、 调制模块 180以及发 送模块 190概括为发送侧预处理模块，所述发送侧预处理模块的具体实现包括 但不限于前述的内部结构。  Similar to the embodiment of the transmitting method of the present invention, the transmitting end may not perform channel error correction encoding before the packet, and therefore the encoding module 110 may not be included in the transmitting end. And the first scrambling module 140, the merging module 150, the second scrambling module 160, the DFT transform module 170, the modulating module 180, and the sending module 190 can be summarized as a transmitting side preprocessing module, and the specific part of the sending side preprocessing module Implementations include, but are not limited to, the aforementioned internal structures.
在接收装置中包含接收模块 210, 用于接收 OFDM信号； 解调模块 220, 用于将该接收模块收到的 OFDM信号解调后输出； IDFT变换模块 230, 用于 将该解调模块输出的信号进行 IDFT变换后输出； 第二解扰模块 240 , 用于将 该 IDFT变换模块输出的信号以小区扰码进行解扰后输出；第一解扰模块 250， 用于将该第二解扰模块输出的信号以信道扰码进行解扰后输出；第二分组模块 260, 用于将第一解扰模块输出的信号按发送端映射的正交码长度进行分组后 输出； 相关处理及译码模块 270， 用于将该第二分组模块输出的各组信号进行 正交码的相关处理和纠错译码后输出。 与发送装置的具体实现情况相对应，可以将接收模块 210、解调模块 220、 IDFT变换模块 230、 第二解扰模块 240以及第一解扰模块 250概括为接收侧 预处理模块，所述接收侧预处理模块为第二分组模块 260提供其所需的包括多 个正交码的信道信号，所述接收侧预处理模块的具体实现包括但不限于前述的 内部结构。 The receiving device includes a receiving module 210 for receiving an OFDM signal, a demodulating module 220, configured to demodulate and output the OFDM signal received by the receiving module, and an IDFT transform module 230, configured to output the demodulation module. The signal is subjected to IDFT conversion and output; the second descrambling module 240 is configured to descramble the signal output by the IDFT transform module by using a cell scrambling code; and the first descrambling module 250 is configured to: the second descrambling module The output signal is descrambled and outputted by the channel scrambling code; the second grouping module 260 is configured to group the signals output by the first descrambling module according to the orthogonal code length mapped by the transmitting end, and output the same; 270. The group of signals output by the second grouping module are subjected to orthogonal code correlation processing and error correction decoding, and then output. Corresponding to the specific implementation of the sending device, the receiving module 210, the demodulating module 220, the IDFT transform module 230, the second descrambling module 240, and the first descrambling module 250 may be summarized as a receiving side preprocessing module, and the receiving The side pre-processing module provides the second grouping module 260 with its required channel signal including a plurality of orthogonal codes, and specific implementations of the receiving-side pre-processing module include, but are not limited to, the aforementioned internal structure.
相关处理及译码模块 270具体用于在所有可能的译码结果序列中，找出所  The correlation processing and decoding module 270 is specifically configured to find out in all possible sequences of decoding results.
2  2
对应的 £ Xk,m Wk, 值最大的序列， 将该序列作为译码结果， 其中， xk m 为 第 k组信号的第 m个比特， ¾m 为可能的译码结果经与发送端相同的方式编 码和分组后的第 k组信号所对应的正交码的第 m个比特， A为编码信号组数， B为正交码的长度。 如果发送装置在分组之前没有进行信道纠错编码（即没有 编码模块 110 ), 则所述 ¾m 为可能的译码结果经与发送端相同的分组后得到 的第 k组信号所对应的正交码的第 m个比特， A为信号组数。 Corresponding £ X k, m W k, the maximum value of the sequence, this sequence as a decoding result, wherein, x km is the m-th bit of the k-th group signals, ¾m decoding result is possible with the sender via the same The mode encodes and encodes the mth bit of the orthogonal code corresponding to the kth group of signals, A is the number of coded signal groups, and B is the length of the orthogonal code. If the transmitting device does not perform channel error correction coding (ie, without the encoding module 110) before the packet, the 3⁄4m is an orthogonal code corresponding to the kth group signal obtained after the same decoding result as the transmitting end. The mth bit, A is the number of signal groups.
本发明的第四实施方式基于 OFDM***的发送与接收装置如图 11所示， 与第三实施方式大致相同， 其区别仅在于， 在发送装置中， 第一加扰模 140 块还用于对导频信号以导频信道扰码进行加扰，合并模块 150将经该第一加扰 模块 140加扰后的各信道的信号以及导频信号合并后输出到 DFT 变换模块 170。 在接收装置中， 增加了信道估值模块 290 以及解相干模块 280。 信道估 值模块 290用于根据第一解扰模块 250解扰后得到的导频信号进行信道估值； 解相干模块 280用于根据该信道估值模块 290得出的估值对其它各信道信号进 行相干解调后输出到第二分组模块 260。 由第二分组模块 260对经相干解调后 的各信道信号按发送端映射的正交码长度进行分组后输出到相关处理和纠错 译码模块 270。 通过在发送装置发送的信号中包含了导频信号， 使得接收装置 能根据解扰后得到的导频信号进行信道估值，并根据得到的估值结果采用相干 解调， 进一步提高了接收质量。 The transmitting and receiving apparatus based on the OFDM system of the fourth embodiment of the present invention is substantially the same as that of the third embodiment, as shown in FIG. 11, except that in the transmitting apparatus, the first scrambling module 140 is also used for the pair. The pilot signal is scrambled by the pilot channel scrambling code, and the combining module 150 combines the signals of the channels scrambled by the first scrambling module 140 and the pilot signals, and outputs the signals to the DFT transform module 170. In the receiving device, a channel estimation module 290 and a decoherence module 280 are added. The channel estimation module 290 is configured to perform channel estimation according to the pilot signal obtained after descrambling by the first descrambling module 250. The decohering module 280 is configured to use the estimated value obtained by the channel estimation module 290 for each channel signal. Coherent demodulation is performed and output to the second grouping module 260. The coherently demodulated channel signals are grouped by the second grouping module 260 according to the orthogonal code length mapped by the transmitting end, and then output to the correlation processing and error correction decoding module 270 . Receiving device by including a pilot signal in a signal transmitted by the transmitting device The channel estimation can be performed according to the pilot signal obtained after descrambling, and coherent demodulation is adopted according to the obtained estimation result, thereby further improving the reception quality.
与前述基于第三实施方式的发送、接收装置同理，发送装置中也可以没有 编码模块 110。并且，可以将接收装置中的接收模块 210、解调模块 220、 IDFT 变换模块 230、 第二解扰模块 240以及第一解扰模块 250、 信道估值模块 290 以及解相干模块 280概括为接收侧预处理模块。  In the same manner as the above-described transmitting and receiving apparatus according to the third embodiment, the transmitting apparatus 110 may not be provided in the transmitting apparatus. Moreover, the receiving module 210, the demodulating module 220, the IDFT transform module 230, the second descrambling module 240, and the first descrambling module 250, the channel estimating module 290, and the decoherence module 280 in the receiving device may be summarized as the receiving side. Preprocessing module.
通过以上本发明各实施例可以看出，由于采用了在发送端对待传输信号进 行分组后再映射为正交码的技术， 使得映射到的每个正交码长度相应地较短， 进而每个正交码所对应的 OFDM信号占用的时频块也就较小 , 因此有效的抵 抗了 OFDM***固有的频率选择性衰落与时间选择性衰落， 进而能够提高接 收端接收到的扩频信号（如正交码） 的正交性。  It can be seen from the foregoing embodiments of the present invention that, by adopting a technique of grouping a signal to be transmitted at a transmitting end and then mapping it to an orthogonal code, the length of each orthogonal code mapped is correspondingly shorter, and thus each The OFDM signal corresponding to the orthogonal code occupies a small time-frequency block, so it effectively resists the frequency selective fading and time-selective fading inherent in the OFDM system, thereby improving the spread spectrum signal received by the receiving end (eg, Orthogonality of orthogonal codes).
进一步，通过在将待传输信号进行分组前先进行纠错编码的技术，使得信 号在传输质量上有较大的增益。  Further, by performing the technique of error correction coding before grouping the signals to be transmitted, the signal has a large gain in transmission quality.
更进一步，发送端通过以信道扰码进行加扰的方式区分多个信道的发送信 号， 以小区扰码进行加扰的方式区分不同小区的发送信号，有效利用了频谱资 源。  Further, the transmitting end distinguishes the transmission signals of the plurality of channels by scrambling the channel scrambling code, and distinguishes the transmission signals of the different cells by the scrambling of the cell scrambling code, thereby effectively utilizing the spectrum resources.
最后，发送端通过对导频信号进行加扰， 并将加扰后的导频信号与各信道 的经加扰后的信号进行合并后发送，接收端根据解扰后的导频信号进行信道估 值， 并根据得到的估值结果采用相干解调， 进一步提高了接收质量。  Finally, the transmitting end performs scrambling on the pilot signal, and combines the scrambled pilot signal with the scrambled signal of each channel, and the receiving end performs channel estimation according to the descrambled pilot signal. The value, and coherent demodulation based on the obtained evaluation result, further improves the reception quality.
虽然通过参照本发明的某些优选实施方式，已经对本发明进行了图示和描 述，但本领域的普通技术人员应该明白，可以在形式上和细节上对其作各种改 变， 而不偏离本发明的精神和范围。  Although the invention has been illustrated and described with reference to the preferred embodiments of the present invention, it will be understood The spirit and scope of the invention.

Claims

权 利 要 求 Rights request
1. 一种基于正交频分复用的发送方法， 其特征在于， 包括：  A transmission method based on orthogonal frequency division multiplexing, characterized in that it comprises:
将待传输信号分为至少两组信号；  Dividing the signal to be transmitted into at least two groups of signals;
将所述每组信号各映射到一个正交码；  Mapping each of the sets of signals to an orthogonal code;
将所述映射后的各正交码进行发送侧预处理后发送。  The mapped orthogonal codes are preprocessed on the transmitting side and then transmitted.
2. 根据权利要求 1所述的方法， 其特征在于， 在所述将待传输信号分为 至少两组信号之前还包括： 将信道中预定长度的信息序列进行纠错编码，形成 所述信道中待传输的编码信号；  The method according to claim 1, wherein before the dividing the signal to be transmitted into at least two groups of signals, the method further comprises: performing error correction coding on a sequence of information of a predetermined length in the channel to form the channel. Coded signal to be transmitted;
所述将待传输信号分为至少两组信号的步骤包括：将所述信道中待传输的 编码信号分为至少两组信号 ,其中每组信号的长度小于所述信息序列的预定长 度。  The step of dividing the signal to be transmitted into at least two groups of signals comprises dividing the coded signals to be transmitted in the channel into at least two groups of signals, wherein the length of each group of signals is less than a predetermined length of the sequence of information.
3. 根据权利要求 1所述的方法， 其特征在于， 所述每个正交码对应的信 号通过连续的时频块发送。  The method according to claim 1, wherein the signal corresponding to each orthogonal code is sent by a continuous time-frequency block.
4. 根据权利要求 1至 3中任一项所述的方法， 其特征在于， 所述将映射 后的各正交码进行发送侧预处理后发送的步骤包括：  The method according to any one of claims 1 to 3, wherein the step of performing the pre-processing of the mapped orthogonal codes on the transmitting side comprises:
将所述映射后的各正交码进行离散傅立叶变换；  Performing discrete Fourier transform on each of the mapped orthogonal codes;
将经过所述离散傅立叶变换后的信号调制为正交频分复用信号； 将所述调制后的正交频分复用信号发送。  The discrete Fourier transformed signal is modulated into an orthogonal frequency division multiplexed signal; and the modulated orthogonal frequency division multiplexed signal is transmitted.
5. 根据权利要求 4所述的方法， 其特征在于， 当至少两个信道中有所述 待传输信号时， 在进行所述离散傅立叶变换之前还包括：  The method according to claim 4, wherein, when the signal to be transmitted is included in the at least two channels, before the performing the discrete Fourier transform, the method further includes:
将各信道中映射后的各正交码和导频信号分别以相应的信道扰码进行加 扰；  The orthogonal codes and pilot signals mapped in each channel are respectively scrambled by corresponding channel scrambling codes;
将经过上述加扰后的各信号合并。 The signals after the above scrambling are combined.
6. 一种基于正交频分复用的接收方法， 其特征在于， 包括： 对接收到的信号进行接收侧预处理，从中恢复出包括多个正交码的信道信 号； A receiving method based on orthogonal frequency division multiplexing, comprising: performing receive side preprocessing on a received signal, and recovering a channel signal including a plurality of orthogonal codes therefrom;
将所述包括多个正交码的信道信号按发送端进行映射时的正交码长度进 行分组， 并基于所述分组后的各组信号进行联合的正交码相关处理和纠错译 码。  The channel signals including the plurality of orthogonal codes are grouped by orthogonal code lengths when mapped by the transmitting end, and combined orthogonal code correlation processing and error correction decoding are performed based on the grouped signals.
7. 根据权利要求 6所述的方法， 其特征在于： 所述进行联合的正交码相 关处理和纠错译码步骤包括： 在所有可能的译码结果序列中， 找出所对应的 £ 值最大的序
Figure imgf000018_0001
列， 将该序列作为译码结果， 其中， xk,m 为第 k组信号的第 m个比特， wk m 为 可能的译码结果经与发送端相同的方式编码和分组后的第 k组信号所对应的 正交码的第 m个比特， A为编码信号组数， B为正交码的长度。 7. The method according to claim 6, wherein: said performing orthogonal code correlation processing and error correction decoding step comprises: finding a corresponding £ value in all possible decoding result sequences; Maximum order
Figure imgf000018_0001
Column, the sequence is taken as the decoding result, where x k , m is the mth bit of the kth group signal, and w km is the kth group after the possible decoding result is encoded and grouped in the same manner as the transmitting end The mth bit of the orthogonal code corresponding to the signal, A is the number of coded signal groups, and B is the length of the orthogonal code.
8. 根据权利要求 6所述的方法， 其特征在于： 所述进行联合的正交码相 关处理和纠错译码步骤包括： 在所有可能的译码结果序列中， 找出所对应的 值最大的序
Figure imgf000018_0002
列， 将该序列作为译码结果， 其中， xk,m 为第 k组信号的第 m个比特， wk m 为 可能的译码结果经与发送端相同的方式分组后的第 k组信号所对应的正交码 的第 m个比特， A为信号组数， B为正交码的长度。 8. The method according to claim 6, wherein: performing the joint orthogonal code correlation processing and the error correction decoding step comprises: finding a corresponding maximum value among all possible decoding result sequences Preface
Figure imgf000018_0002
Column, the sequence is taken as the decoding result, where x k , m is the mth bit of the kth group signal, and w km is the kth group signal after the possible decoding result is grouped in the same manner as the transmitting end The mth bit of the corresponding orthogonal code, A is the number of signal groups, and B is the length of the orthogonal code.
9. 根据权利要求 6至 8中任意一项所述的方法， 其特征在于， 所述对接 收到的信号进行接收侧预处理步骤包括：  The method according to any one of claims 6 to 8, wherein the receiving side pre-processing step of the received signal comprises:
对接收到的信号进行解调； 将所述解调后的信号进行逆离散傅立叶变换，得到包括多个正交码的信道 信号。 Demodulating the received signal; The demodulated signal is subjected to inverse discrete Fourier transform to obtain a channel signal including a plurality of orthogonal codes.
10. 根据权利要求 9所述的方法， 其特征在于， 当所述接收到的信号包括 至少两个信道的信号时， 所述接收侧预处理步骤还包括： 将所述经过逆离散傅 立叶变换后的信号以信道扰码进行解扰，得到包括多个正交码的信道信号以及 导频信号； 使用所述导频信号进行信道估值， 并根据所述信道估值对其它各信 道的包括多个正交码的信道信号进行相干解调；  The method according to claim 9, wherein when the received signal includes signals of at least two channels, the receiving side pre-processing step further comprises: after the inverse discrete Fourier transform The signal is descrambled by the channel scrambling code to obtain a channel signal including a plurality of orthogonal codes and a pilot signal; the pilot signal is used for channel estimation, and the other channels are included according to the channel estimation. Channel signals of orthogonal codes are coherently demodulated;
所述将包括多个正交码的信道信号进行分组步骤具体为：将所述经过相干 解调后的包括多个正交码的信道信号进行分组。  The step of grouping the channel signals including the plurality of orthogonal codes is specifically: grouping the coherently demodulated channel signals including the plurality of orthogonal codes.
11、 根据权利要求 10所述的方法， 其特征在于， 所述进行联合的正交码 相关处理和纠错译码步骤包括：
Figure imgf000019_0001
The method according to claim 10, wherein the performing the orthogonal code correlation processing and the error correction decoding step comprises:
Figure imgf000019_0001
序列， 将该序列作为译码结果， 其中， xk,m 为第 k组信号的第 m个比特， ¾m 为可能的译码结果经与发送端相同的方式编码和分组后的第 k组信号所对应 的正交码的第 m个比特， Re代表取实数部分， *代表取共轭， hk,m为所述信道 估值， A为编码信号组数， B为正交码的长度。 a sequence, the sequence is used as a decoding result, where x k , m is the mth bit of the kth group of signals, and 3⁄4m is the kth group signal after the possible decoding result is encoded and grouped in the same manner as the transmitting end The mth bit of the corresponding orthogonal code, Re represents the real part, * represents the conjugate, h k , m is the channel estimate, A is the number of coded signals, and B is the length of the orthogonal code.
12. 一种基于正交频分复用的发送装置， 其特征在于， 包含：  12. A transmitting device based on orthogonal frequency division multiplexing, comprising:
第一分组模块， 用于将待传输信号分为至少两组信号；  a first grouping module, configured to divide the signal to be transmitted into at least two groups of signals;
映射模块， 用于将所述第一分组模块输出的每组信号各映射到一个正交 码；  a mapping module, configured to map each group of signals output by the first grouping module to an orthogonal code;
发送侧预处理模块，用于将所述映射模块输出的各正交码进行发送侧预处 理后发送。 The sending side pre-processing module is configured to perform pre-processing on the transmitting side of each orthogonal code output by the mapping module.
13. 根据权利要求 12所述的发送装置， 其特征在于， 所述发送侧预处理 模块包括： The transmitting device according to claim 12, wherein the transmitting side preprocessing module comprises:
离散傅立叶变换模块，用于将所述映射模块输出的各正交码进行离散傅立 叶变换；  a discrete Fourier transform module, configured to perform discrete Fourier transform on each orthogonal code output by the mapping module;
调制模块，用于将所述离散傅立叶变换模块输出的信号调制为正交频分复 用信号；  a modulation module, configured to modulate a signal output by the discrete Fourier transform module into an orthogonal frequency division multiplexing signal;
发送模块， 用于发送所述调制模块输出的正交频分复用信号。  And a sending module, configured to send an orthogonal frequency division multiplexing signal output by the modulation module.
14. 根据权利要求 13所述的发送装置， 其特征在于， 当至少两个信道中 有待传输信号时 , 所述发送侧预处理模块还包含第一加扰模块和合并模块； 所述第一加扰模块，用于将所述映射模块输出的各信道的各正交码以相应 的信道扰码进行加扰，以及将导频信号以导频信道扰码进行加扰；  The transmitting device according to claim 13, wherein, when there is a signal to be transmitted in at least two channels, the transmitting side pre-processing module further includes a first scrambling module and a merging module; a scrambling module, configured to scramble each orthogonal code of each channel output by the mapping module with a corresponding channel scrambling code, and scramble the pilot signal with a pilot channel scrambling code;
所述合并模块， 用于将所述第一加扰模块输出的各信号合并， 并输出到所 述离散傅立叶变换模块。  The merging module is configured to combine the signals output by the first scrambling module and output the signals to the discrete Fourier transform module.
15. 根据权利要求 12至 14中任意一项所述的发送装置， 其特征在于， 所 述发送侧预处理模块在进行发送时，将每个所述正交码对应的信号在连续的时 频块上发送。  The transmitting device according to any one of claims 12 to 14, wherein the transmitting side preprocessing module transmits the signal corresponding to each orthogonal code in a continuous time frequency when transmitting Sent on the block.
16.根据权利要求 12至 14中任意一项所述的发送装置， 其特征在于， 还 包括编码模块： 用于将信道中预定长度的信息序列进行纠错编码，形成所述信 道中待传输的编码信号；  The transmitting device according to any one of claims 12 to 14, further comprising: an encoding module: configured to perform error correction coding on a sequence of information of a predetermined length in the channel to form a to-be-transmitted channel in the channel. Coded signal
所述第一分组模块，具体用于将所述信道中待传输的编码信号分为至少两 组信号， 其中每组信号的长度小于所述信息序列的预定长度。  The first grouping module is specifically configured to divide the coded signals to be transmitted in the channel into at least two groups of signals, wherein a length of each group of signals is less than a predetermined length of the information sequence.
17. 一种基于正交频分复用的接收装置， 其特征在于，  17. A receiving device based on orthogonal frequency division multiplexing, characterized in that
接收侧预处理模块， 用于对接收到的信号进行接收侧预处理，从中恢复出 包括多个正交码的信道信号； a receiving side preprocessing module, configured to perform preprocessing on the receiving side of the received signal, and recover therefrom a channel signal comprising a plurality of orthogonal codes;
第二分组模块，用于将所述包括多个正交码的信号按发送端映射的正交码 长度进行分组；  a second grouping module, configured to group the signals including the plurality of orthogonal codes by orthogonal code lengths mapped by the transmitting end;
相关处理及译码模块，用于将所述分组后的各组信号进行联合的正交码相 关处理和纠错译码。  And a correlation processing and decoding module, configured to perform joint orthogonal code correlation processing and error correction decoding on the grouped signals.
18、 根据权利要求 17所述的接收装置， 其特征在于， 所述接收侧预处理 模块包括：  The receiving device according to claim 17, wherein the receiving side preprocessing module comprises:
接收模块， 用于接收来自发送端的正交频分复用信号；  a receiving module, configured to receive an orthogonal frequency division multiplexing signal from the transmitting end;
解调模块 , 用于将所述正交频分复用信号进行解调；  a demodulation module, configured to demodulate the orthogonal frequency division multiplexed signal;
逆离散傅立叶变换模块， 用于将所述解调后的信号进行逆离散傅立叶变 换， 得到包括多个正交码的信道信号。  And an inverse discrete Fourier transform module, configured to perform inverse discrete Fourier transform on the demodulated signal to obtain a channel signal including a plurality of orthogonal codes.
19. 根据权利要求 17或 18所述的接收装置， 其特征在于，  19. The receiving device according to claim 17 or 18, wherein
所述相关处理及译码模块， 具体用于在所有可能的译码结果序列中，找出  The correlation processing and decoding module is specifically configured to find out in all possible decoding result sequences
2  2
所对应的£ £ Xk,m Wk„ 值最大的序列， 将该序列作为译码结果， 其中， ½ Corresponding to the sequence with the largest value of £ £ X k,m W k„, the sequence is used as the decoding result, where 1⁄2
k=l m=l 为第 k组信号的第 m个比特， ¾m 为可能的译码结果经与发送端相同的方式 编码和分组后的第 k组信号所对应的正交码的第 m个比特， A为编码信号组 数， B为正交码的长度。 k=lm=l is the mth bit of the kth group of signals, and 3⁄4m is the mth bit of the orthogonal code corresponding to the kth group of signals encoded and grouped in the same manner as the transmitting end. , A is the number of coded signal groups, and B is the length of the orthogonal code.
20. 根据权利要求 17或 18所述的接收装置， 其特征在于， 所述接收到的 信号包括至少两个信道的信号， 所述接收侧预处理模块还包括：  The receiving device according to claim 17 or 18, wherein the received signal comprises a signal of at least two channels, and the receiving side preprocessing module further comprises:
第一解扰模块，用于将经过所述逆离散傅立叶变换后的信号以信道扰码进 行解扰， 得到包括多个正交码的信道信号和导频信号；  a first descrambling module, configured to descramble the signal subjected to the inverse discrete Fourier transform by using a channel scrambling code to obtain a channel signal and a pilot signal including a plurality of orthogonal codes;
信道估值模块， 用于 ^居所述导频信号进行信道估值； 以及解相干模块，用于根据所述信道估值对其它各信道的包括多个正交码 的信道信号进行相干解调， 然后输出到所述第二分组模块。 a channel estimation module, configured to perform channel estimation on the pilot signal; And a decoherence module, configured to perform coherent demodulation on the channel signals of the other channels including the plurality of orthogonal codes according to the channel estimation, and then output to the second grouping module.
21、 根据权利要求 20所述的接收装置， 其特征在于，  21. The receiving device according to claim 20, wherein
所述相关处理及译码模块，具体用于在所有可能的译码结果序列中，找出所对 应的 1^ ；¾„^^，„^值最大的序列， 将该序列作为译码结果， 其中， xk,m 为 The correlation processing and decoding module is specifically configured to find a sequence corresponding to the largest value of the corresponding 1^; 3⁄4„^^, „^ in all possible decoding result sequences, and use the sequence as a decoding result. Where x k , m is
J  J
第 k组信号的第 m个比特， ¾m 为可能的译码结果经与发送端相同的方式编 码和分组后的第 k组信号所对应的正交码的第 m个比特, Re代表取实数部分， *代表取共轭， m为所述信道估值， A为编码信号组数， B为正交码的长度。 The mth bit of the kth group signal, 3⁄4m is the mth bit of the orthogonal code corresponding to the kth group signal encoded and grouped by the same way as the transmitting end, and Re represents the real part , * represents the conjugate, m is the channel estimate, A is the number of coded signals, and B is the length of the orthogonal code.
PCT/CN2007/070325 2006-07-19 2007-07-19 A sending and receiving method, device based on ofdm WO2008011834A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610106627.0 2006-07-19
CN2006101066270A CN101110805B (en) 2006-07-19 2006-07-19 Receiving and dispatching method and system based on orthogonal frequency division multiplexing

Publications (1)

Publication Number Publication Date
WO2008011834A1 true WO2008011834A1 (en) 2008-01-31

Family

ID=38981154

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/070325 WO2008011834A1 (en) 2006-07-19 2007-07-19 A sending and receiving method, device based on ofdm

Country Status (2)

Country Link
CN (1) CN101110805B (en)
WO (1) WO2008011834A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011060033A1 (en) * 2009-11-10 2011-05-19 Immunolight, L.L.C. Up and down coversion systems for production of emitted light from various energy sources including radio frequency, microwave energy and magnetic induction sources for upconversion

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101841355B (en) * 2009-03-17 2013-12-11 中兴通讯股份有限公司 Demodulation pilot frequency mapping processing method and device
CN102014475B (en) 2010-01-08 2012-01-04 华为技术有限公司 Resource mapping and code division multiplexing method and device
CN107426744A (en) * 2016-05-23 2017-12-01 中兴通讯股份有限公司 The system of selection of cell signal and device
CN111385074B (en) * 2018-12-28 2023-10-17 中兴通讯股份有限公司 Reference signal processing method and device
US11997030B2 (en) * 2019-11-12 2024-05-28 Qualcomm Incorporated Architecture for non-coherent communication in wireless networks

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1448015A (en) * 2000-07-12 2003-10-08 高通股份有限公司 Multiplexing real time services and non-real time services for OFDM systems
CN1529438A (en) * 2003-09-30 2004-09-15 焦秉立 CDMA spectrum-spreading method, despreading method and receiver
CN1549471A (en) * 2003-05-16 2004-11-24 中国科学技术大学 Transmitter and receiver capable of raising space time block code performance
US20050094613A1 (en) * 2003-10-31 2005-05-05 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving a pilot signal for distinguishing a base station in a communication system using an OFDM scheme
US20050249298A1 (en) * 2004-04-28 2005-11-10 Taeyoon Kim Multi-code multi-carrier code division multiple access (CDMA) system and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7512185B2 (en) * 2004-03-08 2009-03-31 Infineon Technologies Ag Dual carrier modulator for a multiband OFDM UWB transceiver

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1448015A (en) * 2000-07-12 2003-10-08 高通股份有限公司 Multiplexing real time services and non-real time services for OFDM systems
CN1549471A (en) * 2003-05-16 2004-11-24 中国科学技术大学 Transmitter and receiver capable of raising space time block code performance
CN1529438A (en) * 2003-09-30 2004-09-15 焦秉立 CDMA spectrum-spreading method, despreading method and receiver
US20050094613A1 (en) * 2003-10-31 2005-05-05 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving a pilot signal for distinguishing a base station in a communication system using an OFDM scheme
US20050249298A1 (en) * 2004-04-28 2005-11-10 Taeyoon Kim Multi-code multi-carrier code division multiple access (CDMA) system and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011060033A1 (en) * 2009-11-10 2011-05-19 Immunolight, L.L.C. Up and down coversion systems for production of emitted light from various energy sources including radio frequency, microwave energy and magnetic induction sources for upconversion

Also Published As

Publication number Publication date
CN101110805A (en) 2008-01-23
CN101110805B (en) 2012-01-04

Similar Documents

Publication Publication Date Title
US10103862B2 (en) Method, apparatus, and system for transmitting and receiving information of an uncoded channel in an orthogonal frequency division multiplexing system
KR100922950B1 (en) Apparatus and method for transmitting and receiving process result of a data frame in a orthogonal frequency division multiple system
KR100520159B1 (en) Apparatus and method for interference cancellation of ofdm system using multiple antenna
US9954709B2 (en) Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals
US20060291372A1 (en) Apparatus and method for reducing pilot overhead in a wireless communication system
WO2016127324A1 (en) Peak-to-average power ratio reducing method, apparatus, device and system
US20060250944A1 (en) Apparatus and method for transmitting bit-interleaved coded modulation signals in an orthogonal frequency division multiplexing system
US9537698B2 (en) Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals
WO2008011834A1 (en) A sending and receiving method, device based on ofdm
KR20070096539A (en) Apparatus and method for transmitting/receiving control channel in orthogonal frequency division multiplexing system
JPWO2008013034A1 (en) Mobile communication system, base station apparatus and mobile station apparatus
US8611203B2 (en) Coding information for communication over an orthogonal frequency division multiple access (OFDMA)-based wireless link
US20070286064A1 (en) Transmission/reception apparatus and method for supporting both high rate packet data transmission and orthogonal frequency division multiplexing transmission in a mobile communication system
WO2009003417A1 (en) Method and apparatus for sending and receiving multicast/broadcast service
US20180035138A1 (en) Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals
WO2007137489A1 (en) Signal receiving and transmitting method in the Orthogonal Frequency Division Multiplexing system and apparatus thereof
EP1576757A1 (en) Transmitter diversity method for ofdm system
WO2008025278A1 (en) An orthogonal frequency divide multiplexing based signal transmitting method and device thereof
WO2008049283A1 (en) A method and system for data transmission and reception using scrambling codes to identify cells
WO2008017256A1 (en) A method and device for receiving and transmitting ofdm signal
TWI696359B (en) Cyclic-frequency shift orthogonal frequency division multiple access spread spectrum device
CN110024346B (en) Method and sending end equipment for data processing
WO2008074254A1 (en) A signal receiving and transmitting method and device based on ofdm
WO2007134542A1 (en) Method and apparatus of sending and receiving signal
CN106254294B (en) The method that short packages ultra wide band is sent is realized in block code ofdm system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07764252

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

122 Ep: pct application non-entry in european phase

Ref document number: 07764252

Country of ref document: EP

Kind code of ref document: A1