WO2014134805A1 - 数据压缩方法、还原方法，装置及*** - Google Patents

数据压缩方法、还原方法，装置及*** Download PDF

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Publication number
WO2014134805A1
WO2014134805A1 PCT/CN2013/072267 CN2013072267W WO2014134805A1 WO 2014134805 A1 WO2014134805 A1 WO 2014134805A1 CN 2013072267 W CN2013072267 W CN 2013072267W WO 2014134805 A1 WO2014134805 A1 WO 2014134805A1
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Prior art keywords
signal
digital signal
frequency
sampling
data
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PCT/CN2013/072267
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English (en)
French (fr)
Inventor
秦风平
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2013/072267 priority Critical patent/WO2014134805A1/zh
Priority to CN201380000331.9A priority patent/CN103518356A/zh
Priority to EP13877388.2A priority patent/EP2953303A4/en
Publication of WO2014134805A1 publication Critical patent/WO2014134805A1/zh
Priority to US14/842,514 priority patent/US20150372711A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M5/00—Conversion of the form of the representation of individual digits
    • H03M5/02—Conversion to or from representation by pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3059—Digital compression and data reduction techniques where the original information is represented by a subset or similar information, e.g. lossy compression
    • 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
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • 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
    • H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults

Definitions

  • the present invention relates to the field of communications, and in particular, to a data compression method, a reduction method, an apparatus, and a system. Background technique
  • C-RAN Code Division Multiple Access
  • RRU radio remote unit
  • BBU baseband unit
  • CPRI Common Publ ic Radio Interface
  • the above problem is mainly solved by performing data compression processing on the transmitted data without loss of information.
  • the signal output by the RRU is compressed in the compression controller before being transmitted to the BBU, and then differentially and coded compressed by the compressed data and the original data, and the multiplexed data is combined by the multiplexer, and then passed through the CPRI. Passed to the BBU, and finally decoded in the BBU, recovers the compressed signal, and sends it to the baseband processor for subsequent processing.
  • the coding methods mainly include: differential coding, Huffman coding, and block floating-point coding.
  • the main disadvantages of this approach are: The amount of data transmitted over CPRI is still large. Summary of the invention
  • Embodiments of the present invention provide a data compression method, a reduction method, a device, and a system, which can reduce the amount of data transmitted.
  • an embodiment of the present invention provides a data compression method, including:
  • the sampling frequency of the first compressed signal is not less than a frequency threshold; the frequency threshold is twice the baseband cutoff frequency of the first digital signal;
  • the first compressed signal is transmitted over a transport format based on the Common Public Radio Interface (CPRI) protocol.
  • CPRI Common Public Radio Interface
  • the downsampling process is performed on the first digital signal by interpolation and decimation.
  • the first digital signal is a digital signal obtained by sampling the filtered signal at a sampling frequency of not less than twice the chip rate.
  • a data restoration method including:
  • the first compressed signal is obtained by performing a downsampling process on the first digital signal, and the sampling frequency of the first compressed signal is not less than a frequency a threshold value; the frequency threshold is twice the baseband cutoff frequency of the first digital signal; and the first compressed signal is subjected to upsampling processing to obtain a second signal.
  • CPRI common public radio interface
  • the upsampling process is performed on the first compressed signal by interpolation and decimation.
  • the first digital signal is a digital signal obtained by sampling the filtered signal at a sampling frequency of not less than twice the chip rate.
  • a data compression apparatus comprising:
  • An acquiring unit configured to acquire a first digital signal
  • a processing unit configured to perform a downsampling process on the first digital signal, to obtain a first compressed signal, where a sampling frequency of the first compressed signal is not less than a frequency threshold; and the frequency threshold is the first digital signal Double the baseband cutoff frequency;
  • a sending unit configured to send the first compressed signal by using a transmission format based on a CPRI protocol.
  • the processing unit performs the downsampling process on the first digital signal by interpolation and extraction.
  • the acquiring unit acquires the A digital signal is a digital signal obtained by sampling a filtered signal at a sampling frequency of not less than twice the chip rate.
  • a data restoration apparatus comprising:
  • An acquiring unit configured to receive a first compressed signal that is sent by using a common public radio interface (CPRI)-based transmission format, where the first compressed signal is obtained by performing a downsampling process on the first digital signal, where the first compressed signal is
  • the sampling frequency is not less than a frequency threshold; the frequency threshold is twice the baseband cutoff frequency of the first digital signal;
  • a processing unit configured to perform upsampling processing on the first compressed signal received by the acquiring unit, to obtain a second signal.
  • the processing unit performs the upsampling process on the first digital compressed signal by interpolation and decimation.
  • the first digital signal is a digital signal obtained by sampling the filtered signal at a sampling frequency of not less than twice the chip rate.
  • the present invention provides a radio remote unit RRU, including the data compression device provided by the third aspect.
  • the RRU further includes a data restoration device provided by the fourth aspect.
  • an embodiment of the present invention provides a baseband unit BBU, including the data compression apparatus provided by the third aspect.
  • the BBU further includes a data restoration device provided by the fourth aspect.
  • an embodiment of the present invention provides a data compression apparatus, where the apparatus includes: a processor;
  • the system bus is configured to connect the processor and the memory;
  • An application is stored in the memory, the application including instructions operable to cause the processor to perform the following process:
  • the first compressed signal is transmitted through a transmission format based on the CPRI protocol.
  • the downsampling process is performed on the first digital signal by interpolation and decimation.
  • the first digital signal is a digital signal obtained by sampling the filtered signal at a sampling frequency of not less than twice the chip rate.
  • an embodiment of the present invention provides a data restoration apparatus, where the apparatus includes: a processor;
  • the system bus is configured to connect the processor and the memory
  • An application is stored in the memory, the application including instructions operable to cause the processor and the system to perform the following process:
  • the sampling frequency of the first compressed signal is not less than a frequency threshold; the frequency threshold is twice a baseband cutoff frequency of the first digital signal; for the first compressed signal Perform an upsampling process to obtain a second signal.
  • the upsampling process is performed on the first compressed signal by interpolation and decimation.
  • the first digital signal is a digital signal obtained by sampling the filtered signal at a sampling frequency of not less than twice the chip rate.
  • a ninth aspect an embodiment of the present invention provides a data transmission system, including a third aspect or a Seven aspects of data compression devices.
  • system further includes the data restoration device provided by the fourth aspect or the eighth aspect.
  • the first digital signal is obtained by performing a downsampling process on the first digital signal to obtain a first compressed signal, where a sampling frequency of the first compressed signal is not less than a frequency threshold;
  • the threshold is twice the baseband cutoff frequency of the first digital signal;
  • the first compressed signal is transmitted through a transmission format based on the common public radio interface CPRI protocol. It reduces the amount of data transmitted on the CPRI, improves the data transmission efficiency, or increases the number of RRUs or BBUs that can be supported on a unit CPRI.
  • FIG. 1 is a schematic diagram of an application scenario of a data compression and restoration method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a data compression method according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of a data restoration method according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic diagram of a data compression apparatus according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic diagram of a data restoration apparatus according to Embodiment 4 of the present invention.
  • FIG. 6 is a schematic diagram of a data compression apparatus according to Embodiment 5 of the present invention.
  • FIG. 7 is a schematic diagram of a data restoration apparatus according to Embodiment 6 of the present invention. detailed description
  • the baseband chip rate sent by the user equipment (UE) to the base station and transmitted by the base station to the UE is 3.84 Mchip/ in the Wideband Code Division Multiple Access (WCDMA) system. s, the maximum frequency bandwidth of the signal in the frequency domain is 3.84MHz, and the cutoff frequency is 1.92MHz.
  • WCDMA Wideband Code Division Multiple Access
  • the baseband signal is filtered by the receive filter before being transmitted, so that the bandwidth of the baseband signal is extended to about 4.68 MHz, that is, after the receive filter, the transmitted signal is transmitted except the transmitted signal. Useful letter There will be some redundant signals outside the number).
  • the cutoff frequency of the extended signal is 2.34MHz. According to the Nyquist sampling theorem, the sampling frequency of the signal is at least twice or more than the cutoff frequency of the useful signal to ensure that the sampled signal does not alias, ie the sampling frequency. Both should be more than twice the 2.34MHz.
  • the antenna sends the received signal sent by the UE to the RRU. After downsampling, the downsampled signal is transmitted to the BBU through the CPRI; or the downsampled signal that the BBU sends to the UE is transmitted to the RRU through the CPRI. .
  • the BBU scales to form a BBU poo l, and the RRUs of multiple sites share the resources of the BBU poo l.
  • the BBU poo l is composed of multiple BBUs, and the RRU and the BBU are The connection between the RBU and the BBU in the BBU poo 1 is the same as that of the BBU.
  • the signal sampling frequency transmitted between the BBU and the RRU is 7.68MHz, that is, the sampling frequency of the signal is generally twice that of 3.84MHz, that is, 7.68MHZ. 7. 68MHZ is taken because it allows for synchronization and timing on digital signal processing in hardware.
  • the amount of data of each user transmitted on the CPRI can be reduced, so that no loss of useful signals can be considered.
  • Reduce the sampling frequency of the signal transmitted on the CPRI Without losing the signal, it can be reduced from 7.84MHz to 4.68MHz. If a certain amount of information loss is allowed, it can be lowered even lower. That is, the sampling rate multiple (which is a multiple of the actual sampling frequency with respect to 3.84MHz) satisfies the condition: 3.84 ⁇ 4.68, which is ⁇ 4 ⁇ 68 /3 ⁇ 84.
  • FIG. 1 is a schematic diagram of an application scenario of a data compression method, a restoration method, a device, and a system according to an embodiment of the present invention.
  • the signal transmitted by the CPRI between the RRU and the BBU is downsampled and compressed, and the signal sampling frequency is reduced to multiple ( ⁇ 4.68 / 3.84), and then transmitted through the CPRI protocol, specifically as follows:
  • the process of downsampling is performed in the RRU, and the data of the above sampling rate is doubled (relative to a multiple of 3.84MHz), and the data is down-converted to the multi-sampling rate data, and then transmitted through the CPRI protocol.
  • the BBU After the BBU receives the data, the BBU performs the data.
  • the recovered data is then sent to the baseband processor for subsequent processing.
  • the process of downsampling is performed in the BBU, and the signal output by the baseband processor in the BBU is more than twice the sampling rate data, which is downsampled into doubled sampling rate data, and then transmitted through the CPRI protocol.
  • the RRU upsamples it and restores it to more than twice the sample rate data. It can be seen that the above two processes all downsample the data before transmission, thereby reducing the amount of data transmitted on the CPRI, improving the data transmission efficiency, or increasing the RRU or BBU supported on the unit CPRI. The number.
  • FIG. 2 is a flowchart of a data compression method according to Embodiment 1 of the present invention. As shown in FIG. 2, the method provided by the embodiment of the present invention includes:
  • the first digital signal is a digital signal obtained by sampling the filtered signal at a sampling frequency of not less than twice the chip rate.
  • the baseband chip rate of the signal sent by the UE to the base station and the base station to the UE is 3.84 Mchip/s, that is, the maximum frequency bandwidth of the transmitted signal in the frequency domain is 3.84 MHz, in order to prevent Inter-symbol interference occurs during transmission.
  • the baseband signal is filtered by the receive filter before transmission, which will extend the bandwidth of the baseband signal to about 4.68MHz.
  • the signal filtered by the receive filter becomes the filtered signal, and the filtered signal is sampled.
  • the received signal is referred to as a first digital signal, and the sampling frequency of the first digital signal is generally not less than 7.68 MHz, and the convenience for hardware implementation is usually 7.68 MHz.
  • the sampling frequency of the signal is at least twice the cutoff frequency of the original signal to ensure that the sampled signal does not alias. Therefore, when downsampling the first digital signal, it is not possible to reduce the frequency without limitation, but to ensure that the sampling frequency is more than twice the baseband cutoff frequency of the first digital signal, that is, a frequency threshold can be set, and the frequency threshold can be set.
  • the value is twice the baseband cutoff frequency of the first digital signal. That is, if the first digital signal baseband cutoff frequency is 2.34 MHz, the downsampling frequency must be greater than 4.68 MHz.
  • the down sampling process may be performed on the first digital signal by interpolation and decimation. How to sample by the difference and extraction belongs to the existing mature technology, and will not be described here.
  • the present invention adopts a method of performing interpolation and extraction on a digital signal to reduce the sampling rate, thereby realizing the purpose of data compression, and avoids the problem of high error rate caused by the method of encoding data to realize data compression. It can be seen that since the compression controller is not used to compress the data, the resource consumption is reduced, and the data is not encoded by differential encoding, Huffman encoding, and block floating-point encoding, so that subsequent data recovery can be avoided. Data out of synchronization occurs, thereby avoiding a higher bit error rate.
  • the sampling frequency can be a value between 7.84 MHz and 4.68 MHz. If a certain information loss is allowed, the sampling frequency can be lower than 4.68 MHz.
  • S203 Send the first compressed signal by using a transmission format based on a common public radio interface (CPRI) protocol.
  • CPRI common public radio interface
  • the down-converted data is transmitted through the transmission format of the CPRI protocol, thereby reducing the amount of data transmission and saving resources.
  • the foregoing embodiment describes: acquiring a first digital signal; performing a downsampling process on the first digital signal to obtain a first compressed signal; and transmitting the first compressed signal by using a transmission format based on a common public wireless interface CPRI protocol. . Since the data is down-converted before being transmitted through the CPRI protocol, the amount of data transmitted on the CPRI is reduced, the data transmission efficiency is improved, or the number of RRUs or BBUs that can be supported on a unit CPRI is increased.
  • FIG. 3 is a flowchart of a data restoration method according to Embodiment 2 of the present invention.
  • the method provided by the embodiment of the present invention includes: S301: Receive a first transmission by using a transmission format based on a common public radio interface (CPRI protocol) Compressing the signal, the first compressed signal is obtained by downsampling the first digital signal, the sampling frequency of the first compressed signal is not less than a frequency threshold; the frequency threshold is a baseband cutoff of the first digital signal Double the frequency.
  • CPRI protocol common public radio interface
  • the first digital signal is a digital signal obtained by sampling at a sampling frequency of not less than twice the chip rate.
  • the BBU receives the first compressed signal sent by the RRU (or BBU) through the CPRI, the first compressed signal is a down-converted compressed signal, and the sampling frequency of the first compressed signal satisfies Nyquist
  • the sampling frequency is more than twice the baseband cutoff frequency of the first digital signal, that is, if the first compressed signal baseband cutoff frequency is 2.34 MHz, the downsampling frequency must be greater than 3.68 MHz.
  • the second signal may be a first digital signal or a signal different from the first digital signal.
  • the up-sampling process can be performed by the difference and the decimation, and the first compressed signal can be restored to the state before the down-sampling.
  • the sampling frequency of the first digital signal is generally not less than 7.68 MHz, which is usually 7.68 MHz for the convenience of subsequent hardware processing.
  • the data compression method provided by the embodiment of the present invention can be used in the BBU and can be used in the RRU. It can also be used in other related systems in the field. It can be seen that since the signal is restored without relying on the relationship between the data before and after, the data out of synchronization does not occur, thereby avoiding a high bit error rate.
  • the above embodiment describes that the first compressed signal obtained by downsampling is received through the CPRI; the first compressed signal is subjected to upsampling processing to obtain a second signal. Since the first compressed signal received by the CPRI can be restored to its pre-sampling state for subsequent processing, thereby reducing the amount of data transmitted on the CPRI, improving data transmission efficiency, or increasing The number of RRUs or BBUs that can be supported on a unit CPRI.
  • an embodiment of the present invention provides a data compression apparatus corresponding to a data compression method.
  • 4 is a schematic diagram of a data compression apparatus according to Embodiment 3 of the present invention.
  • the apparatus provided by the embodiment of the present invention includes: an obtaining unit 401, a processing unit 402, and a sending unit 403.
  • the obtaining unit 401 is configured to acquire a first digital signal.
  • the processing unit 402 is configured to perform a downsampling process on the first digital signal to obtain a first compressed signal, where a sampling frequency of the first compressed signal is not less than a frequency threshold; the frequency threshold is the first number Signal baseband cutoff frequency is twice.
  • the sending unit 403 is configured to send the first compressed signal by using a transmission format based on a CPRI protocol.
  • the first digital signal acquired by the acquiring unit 401 is a digital signal obtained by sampling the filtered signal by using a sampling frequency of not less than twice the chip rate.
  • the processing unit 402 performs the downsampling process on the first digital signal by interpolation and decimation.
  • the device provided by the embodiment of the present invention is configured with the data compression method provided in the foregoing embodiment. Therefore, the specific working process of the device provided by the embodiment of the present invention is not described herein again.
  • the first digital signal is obtained by the obtaining unit 401; the processing unit 402 performs a downsampling process on the first digital signal to obtain a first compressed signal; and the sending unit 403 passes the first compressed signal.
  • Transmission format based on CPRI protocol. Since the data is down-converted before being transmitted through the CPRI protocol, the amount of data transmitted on the CPRI is reduced, the data transmission efficiency is improved, or the number of RRUs or BBUs that can be supported on a unit CPRI is increased.
  • FIG. 5 is a schematic diagram of a data restoration apparatus according to Embodiment 4 of the present invention.
  • the apparatus provided by the embodiment of the present invention includes: an obtaining unit 501 and a processing unit 502.
  • the obtaining unit 501 is configured to receive a first compressed signal that is sent by using a general public radio interface (CPRI)-based transmission format, where the first compressed signal is obtained by performing a downsampling process on the first digital signal, where the first compressed signal is obtained.
  • the sampling frequency is not less than a frequency threshold; the frequency threshold is twice the baseband cutoff frequency of the first digital signal
  • the processing unit 502 is configured to perform an upsampling process on the first compressed signal received by the acquiring unit 501 to obtain a second signal.
  • the processing unit 502 performs the upsampling process on the first digital compressed signal by interpolation and decimation.
  • the device provided in the embodiment of the present invention is configured with the data restoration method provided in the foregoing embodiment 2. Therefore, the specific working process of the device provided by the embodiment of the present invention is not described herein again.
  • the acquiring unit 501 receives the first compressed signal obtained by downsampling through the CPRI; the processing unit 502 performs upsampling processing on the first compressed signal received by the obtaining unit 501 to obtain the second signal. . Since the first compressed signal received through the CPRI can be restored to its pre-sampling state for subsequent processing, thereby realizing that the amount of data transmitted on the CPRI can be reduced, the data transmission efficiency is improved, or increased.
  • the embodiment of the present invention further provides a radio remote unit RRU, including the data compression apparatus in the third embodiment or the data restoration apparatus in the above four embodiments.
  • the embodiment of the present invention provides a baseband unit BBU, which includes the data compression apparatus in the third embodiment or the data restoration apparatus in the fourth embodiment.
  • FIG. 6 is a schematic diagram of a data compression apparatus according to Embodiment 5 of the present invention.
  • the apparatus provided by the embodiment of the present invention includes: a network interface 61, a processor 62, and a memory 63.
  • the system bus 64 is used to connect the network interface 61, the processor 62, and the memory 63.
  • Network interface 61 is used for communication with the data compression device and other devices.
  • the memory 63 may be a persistent storage such as a hard disk drive and a flash memory having a software module and a device driver.
  • the software modules are capable of executing the various functional modules of the above described method of the present invention; the device drivers can be network and interface drivers.
  • the sampling frequency of the first compressed signal is not less than a frequency threshold; the frequency threshold is twice the baseband cutoff frequency of the first digital signal;
  • the first compressed signal is transmitted through a transmission format based on the CPRI protocol.
  • the first digital signal is a digital signal obtained by sampling at a sampling frequency of not less than twice the chip rate.
  • the network interface 61 is specifically a CPRI.
  • the downsampling process is performed on the first digital signal by interpolation and decimation.
  • the above is described in the embodiment, by acquiring the first digital signal; performing down-sampling processing on the first digital signal to obtain a first compressed signal; and transmitting the first compressed signal in a transmission format based on a CPRI protocol. Since the data is down-converted before being transmitted through the CPRI protocol, the amount of data transmitted on the CPRI is reduced, the data transmission efficiency is improved, or the number of RRUs or BBUs that can be supported on a unit CPRI is increased.
  • FIG. 7 is a schematic diagram of a data restoration apparatus according to Embodiment 6 of the present invention.
  • the apparatus provided by the embodiment of the present invention includes: a network interface 71, a processor 72, and a memory 73.
  • the system bus 74 is used to connect the network interface 71, the processor 72, and the memory 73.
  • Network interface 71 is used for communication with the data restoration device and other devices.
  • the memory 73 may be a persistent storage such as a hard disk drive and a flash memory having a software module and a device driver.
  • the software modules are capable of executing the various functional modules of the above described method of the present invention; the device drivers can be network and interface drivers.
  • the first compressed signal obtained by downsampling is received by the CPRI, the sampling frequency of the first compressed signal is not less than a frequency threshold; the frequency threshold is twice the baseband cutoff frequency of the first digital signal.
  • the first digital signal is measured by using a sampling frequency of not less than twice the chip rate.
  • the digital signal obtained.
  • the network interface 71 is specifically a CPRI.
  • the upsampling process is performed on the first compressed signal by interpolation and decimation.
  • the first compressed signal obtained by downsampling is received by CPRI; the first compressed signal is subjected to upsampling processing to obtain a second signal. Since the first compressed signal received by the CPRI can be restored to its pre-sampling state for subsequent processing, thereby reducing the amount of data transmitted on the CPRI, improving data transmission efficiency, or increasing The number of RRUs or BBUs that can be supported on a unit CPRI.
  • the embodiment of the present invention further provides a data transmission system, including the data compression device in the third embodiment, or the data compression device in the fifth embodiment.
  • the system further includes the data restoration device of the above-described fourth embodiment, or the data restoration device of the above-described sixth embodiment.
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically programmable ROM
  • EEPROM electrically erasable programmable ROM
  • registers hard disk, removable disk, CD-ROM, or technical field Any other form of storage medium known.

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Abstract

本发明涉及一种数据压缩方法、还原方法，装置及***。包括：获取第一数字信号；对所述第一数字信号进行降采样处理，获取第一压缩信号，其中，所述第一压缩信号的采样频率不小于频率阈值；所述频率阈值为所述第一数字信号基带截止频率的两倍；将所述第一压缩信号通过基于通用公共无线接口CPRI协议的传输格式发送。由于在将数据通过CPRI协议传输之前进行降频，从而实现了减少在CPRI上传输的数据量，提高了数据传输效率，或者说增加了单位CPRI上可支持的RRU或BBU的个数。

Description

数据压缩方法、 还原方法， 装置及*** 技术领域
本发明涉及通信领域， 尤其涉及一种数据压缩方法、 还原方法， 装置及 ***。 背景技术
通信***中， 不同的设备之间互传信息需要占用大量的传输资源。 例如 在 CDMA无线接入网络（CDMA Radio Acces s Network ， C-RAN)架构中， 射频 拉远单元 ( Radio Remote Uni t, RRU )和基带单元 ( Base Band Uni t, BBU ) 之间通过通用公共无线接口 （Common Publ ic Radio Interface, CPRI )传输 的数据量大， 光纤传输资源消耗多， 增加了硬件成本。
现有技术中主要是通过对经传输的数据在不损失信息的前提下进行数据 压缩处理来解决上述问题。 即将 RRU输出的信号在传输给 BBU之前， 先在压 缩控制器中对数据进行压缩， 并且用压缩数据和原始数据再进行差分、 编码 压缩， 并经过复用器将多路数据复合， 然后通过 CPRI传递给 BBU, 最后再在 BBU中进行解码，恢复出被压缩的信号，将其送入基带处理器进行后续的处理。 其中的编码的方法主要有： 差分编码、 霍夫曼编码和块浮点编码等。 这种方 法的主要缺点为： 通过 CPRI传输的数据量仍然很大。 发明内容
本发明实施例提供了一种数据压缩方法、 还原方法， 装置及***， 可以 减少传输的数据量。
第一方面， 本发明实施例提供了一种数据压缩方法， 包括：
获取第一数字信号；
对所述第一数字信号进行降采样处理， 获取第一压缩信号， 其中， 所述 第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字信 号基带截止频率的两倍；
将所述第一压缩信号通过基于通用公共无线接口 CPRI协议的传输格式发 送。
结合第一方面，在第一种可能的实现方式中，通过插值和抽取对所述第一 数字信号进行所述降采样处理。
结合第一方面，在第二种可能的实现方式中，所述第一数字信号为采用不 小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
第二方面， 提供了一种数据还原方法， 包括：
接收通过基于通用公共无线接口 CPRI协议的传输格式发送的第一压缩信 号， 所述第一压缩信号是对第一数字信号进行降采样处理获得的， 所述第一 压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字信号的 基带截止频率的两倍； 对所述第一压缩信号进行上采样处理， 获得第二信号。
结合第二方面，在第一种可能的实现方式中，通过插值和抽取对所述第一 压缩信号进行所述上采样处理。
结合第二方面，在第二种可能的实现方式中，所述第一数字信号为采用不 小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
第三方面， 提供了一种数据压缩装置， 所述装置包括：
获取单元， 用于获取第一数字信号；
处理单元， 用于对所述第一数字信号进行降采样处理， 获取第一压缩信 号， 其中， 所述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为 所述第一数字信号基带截止频率的两倍；
发送单元，用于将所述第一压缩信号通过基于 CPRI协议的传输格式发送。 结合第三方面，在第一种可能的实现方式中，所述处理单元通过插值和抽 取对所述第一数字信号进行所述降采样处理。
结合第三方面，在第二种可能的实现方式中，所述获取单元获取的所述第 一数字信号为采用不小于两倍码片速率的采样频率对滤波信号进行采样获得 的数字信号。
在第四方面， 提供了一种数据还原装置， 所述装置包括：
获取单元， 用于接收通过基于通用公共无线接口 CPRI协议的传输格式发 送的第一压缩信号， 所述第一压缩信号是对第一数字信号进行降采样处理获 得的， 所述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述 第一数字信号的基带截止频率的两倍；
处理单元， 用于对所述获取单元接收的所述第一压缩信号进行上采样处 理， 获得第二信号。
结合第四方面， 在第一种可能的实现方式中， 所述处理单元通过插值和 抽取对所述第一数字压缩信号进行所述上采样处理。
结合第四方面， 在第二种可能的实现方式中， 所述第一数字信号为采用 不小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
第五方面， 本提供了一种射频拉远单元 RRU，包括第三方面提供的数据压 缩装置。
结合第五方面，在第一种可能的实现方式中，所述 RRU还包括第四方面提 供的数据还原装置。
第六方面， 本发明实施例提供了一种基带单元 BBU, 包括第三方面提供的 数据压缩装置。
结合第六方面，在第一种可能的实现方式中，所述 BBU还包括第四方面提 供的数据还原装置。
第七方面， 本发明实施例提供了一种数据压缩装置， 所述装置包括： 处理器；
存储器；
***总线；
所述***总线用于连接所述处理器和所述存储器； 所述存储器中存储应用程序， 所述应用程序包括可用于使所述处理器执 行以下过程的指令：
获取第一数字信号；
对所述第一数字信号进行降采样处理， 获取第一压缩信号， 其中， 所述 第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字信 号基带截止频率的两倍；
将所述第一压缩信号通过基于 CPRI协议的传输格式发送。
结合第七方面，在第一种可能的实现方式中，通过插值和抽取对所述第一 数字信号进行所述降采样处理。
结合第七方面，在第二种可能的实现方式中，所述第一数字信号为采用不 小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
第八方面， 本发明实施例提供了一种数据还原装置， 所述装置包括： 处理器；
存储器；
***总线；
所述***总线用于连接所述处理器和所述存储器；
所述存储器中存储应用程序， 所述应用程序包括可用于使所述处理器和 所述***执行以下过程的指令：
通过 CPRI接收通过降采样获得的第一压缩信号， 所述第一压缩信号的采 样频率不小于频率阈值； 所述频率阈值为第一数字信号基带截止频率的两倍； 对所述第一压缩信号进行上采样处理， 获得第二信号。
结合第八方面，在第一种可能的实现方式中，通过插值和抽取对所述第一 压缩信号进行所述上采样处理。
结合第八方面，在第二种可能的实现方式中，所述第一数字信号为采用不 小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
第九方面， 本发明实施例提供了一种数据传输***， 包括第三方面或第 七方面提供的数据压缩装置。
结合第九方面， 在第一种可能的实现方式中， 所述***还包括第四方面 或第八方面提供的数据还原装置。
本发明实施例中， 通过获取第一数字信号； 对所述第一数字信号进行降 采样处理， 获取第一压缩信号， 其中， 所述第一压缩信号的采样频率不小于 频率阈值； 所述频率阈值为所述第一数字信号基带截止频率的两倍； 将所述 第一压缩信号通过基于通用公共无线接口 CPRI协议的传输格式发送。 而实现 了减少在 CPRI上传输的数据量，提高了数据传输效率，或者说增加了单位 CPRI 上可支持的 RRU或 BBU的个数。 附图说明
图 1是本发明实施例提供的数据压缩、 还原方法应用场景示意图； 图 2是本发明实施例一提供的数据压缩方法流程图；
图 3是本发明实施例二提供的数据还原方法流程图；
图 4是本发明实施例三提供的数据压缩装置示意图；
图 5是本发明实施例四提供的数据还原装置示意图；
图 6是本发明实施例五提供的数据压缩装置示意图；
图 7是本发明实施例六提供的数据还原装置示意图。 具体实施方式
下面通过附图和实施例， 对本发明的技术方案做进一步的详细描述。 在宽带码分多址 ( Wideband Code Divi s ion Mul t iple Acces s , WCDMA ) ***中， 用户设备（User Equipment, UE )发送给基站、 以及基站发送给 UE 的基带码片速率为 3. 84Mchip/s , 即发送的信号在频域上的最大频率带宽为 3. 84MHz , 其截止频率为 1. 92MHz。 为了防止传输过程中出现码间干扰， 基带 信号发送之前都会经过接收滤波器滤波， 从而会使基带信号的带宽扩展到约 4. 68MHz , 即经过接收滤波器后， 传输的信号中除了发送的信号（称为有用信 号）外还会有部分冗余信号， 这部分冗余信号可以起到防止传输过程出现码 间干扰的作用。 扩展后信号的截止频率为 2. 34MHz , 根据奈奎斯特采样定理， 信号的采样频率至少要大于有用信号截止频率的两倍以上， 才能保证经过采 样的信号不会产生混叠， 即采样频率都应在 2. 34MHz 的两倍以上。 天线将接 收到的 UE发送的信号发送给 RRU, 经过降采样之后， 将经过降采样后的信号 通过 CPRI传递给 BBU;或者 BBU将要发送给 UE的经过降采样的信号通过 CPRI 传输给 RRU发送出去。
随着基站向云无线接入网 （C loud RAN )发展， BBU规模化集中形成 BBU poo l , 多个站点的 RRU共享 BBU poo l的资源， BBU poo l由多个 BBU构成， RRU 和 BBU之间的连接方式与 RRU和 BBU poo 1中的一个 BBU之间的连接方式一样， 本实施例以 BBU为例子进行描述
这个过程中，基于实现的方便，在 BBU和 RRU之间传输的信号采样频率都 为 7. 68MHz ,即信号的采样频率一般为 3. 84MHz的两倍，即 7. 68MHZ。取 7. 68MHZ 是因为这样做在硬件上可以方便数字信号处理上的同步和定时。 但是随着用 户数的增加， 需要在 CPRI上传输更多的用户数， 为了达到这样的目的可以通 过减少 CPRI上传输的每一个用户的数据量来实现， 所以考虑在不损失有用信 号的基础上降低 CPRI上传输的信号的采样频率。 在不损失信号的前提下， 可 以从 7. 84MHz降到 4. 68MHz , 如果允许一定的信息损失， 则可以降的更低。 即 采样率倍数 ( 为实际采样频率相对于 3. 84MHz的倍数）满足条件： 3.84 ≥4.68 即可， 可知 ≥4·68 /3·84。
图 1是本发明实施例提供的数据压缩方法、还原方法，装置及***的应用 场景示意图。 如图 1所示， 对在 RRU和 BBU之间通过 CPRI传输的信号进行降 采样压缩， 将信号采样频率降为 倍（ ≥4.68 / 3.84 ) , 再通过 CPRI协议传输， 具体为： ) 图中， 降采样的过程在 RRU中进行， 将两倍（相对于 3. 84MHz 的倍数） 以上采样率数据通过降频， 降为 倍采样率数据， 再通过 CPRI协议 传输， BBU接收到该数据后再进行上采样，将数据恢复成两倍以上采样率数据， 然后将恢复的数据发送至基带处理器进行后续处理。 （b ) 图中， 降采样的过 程在 BBU中进行， BBU中的基带处理器输出的信号为两倍以上采样率数据， 对 其进行降采样成 倍采样率数据， 然后再通过 CPRI协议传输， RRU接收到该 数据后， 对其进行上采样， 恢复成两倍以上采样率数据。 从中可以看出， 上 述两个过程都是在传输之前将数据进行降采样， 从而减少了在 CPRI上传输的 数据量，提高了数据传输效率，或者说增加了单位 CPRI上可支持的 RRU或 BBU 的个数。
下述实施例描述的为数据压缩方法的流程。图 2是本发明实施例一提供的 数据压缩方法流程图。 如图 2所示， 本发明实施例提供的方法包括：
S201 , 获取第一数字信号。
所述第一数字信号为采用不小于两倍码片速率的采样频率对滤波信号进 行采样获得的数字信号。
现有 WCDMA***中， UE发送给基站、 以及基站发送给 UE的的信号的基带 码片速率为 3. 84Mchip/ s ,即发送的信号在频域上的最大频率带宽为 3. 84MHz , 为了防止传输过程中出现码间干扰， 基带信号发送之前都会经过接收滤波器 滤波， 从而会使基带信号的带宽扩展到约 4. 68MHz , 经过接收滤波器滤波后的 信号这里成为滤波信号， 对滤波信号采样获得的信号称为第一数字信号， 第 一数字信号的采样频率一般不小于 7. 68MHz , 为硬件实现的方便通常取 7. 68MHz。
S202 , 对所述第一数字信号进行降采样处理， 获取第一压缩信号， 其中， 所述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数 字信号基带截止频率的两倍。
具体地， 根据奈奎斯特采样定理： 信号的采样频率至少要大于原始信号 截止频率的两倍， 才能保证经过采样的信号不会产生混叠。 因此， 对第一数 字信号进行降采样处理时， 不能无限制的降频， 而是需要保证采样频率为第 一数字信号基带截止频率的两倍以上， 即可以设定一个频率阈值， 该频率阈 值为所述第一数字信号基带截止频率的两倍。 即如果第一数字信号基带截止 频率为 2. 34MHz , 则降采样频率必需大于 4. 68MHz。
具体地， 可以通过插值和抽取对所述第一数字信号进行所述降采样处理。 如何通过差值和抽取进行将采样属于现有的成熟技术， 在此不再赘述。 本发 明采用了对数字信号进行插值抽取的方法来实现采样率的降低， 以实现数据 压缩的目的， 避免了采用对数据进行编码实现数据压缩的方法所带来的高误 码率的问题。 可见， 由于没有采用压缩控制器对数据进行压缩， 因此， 减少 了资源的消耗， 并且没有采用差分编码、 霍夫曼编码和块浮点编码等对数据 进行编码， 因此， 可以避免后续数据恢复时发生数据失步， 从而避免较高的 误码率。
需要说明的是， 在不损失信号的前提下， 将采样频率可以取 7. 84MHz到 4. 68MHz之间的值，如果允许一定的信息损失，则将采样频率可以低于 4. 68MHZ。
S203 , 将所述第一压缩信号通过基于通用公共无线接口 CPRI协议的传输 格式发送。
将降频后的数据通过 CPRI协议的传输格式发送， 从而可以减小数据传输 量， 节省资源。 可以用于 RRU中。 也可以用于本领域中其它相关***中。
上述实施例描述的为， 获取第一数字信号； 对所述第一数字信号进行降 采样处理， 获取第一压缩信号； 将所述第一压缩信号通过基于通用公共无线 接口 CPRI协议的传输格式发送。 由于在将数据通过 CPRI协议传输之前进行 降频， 从而实现了减少在 CPRI上传输的数据量， 提高了数据传输效率， 或者 说增加了单位 CPRI上可支持的 RRU或 BBU的个数。
相应地， 本发明实施例提供了一种数据还原方法。 图 3是本发明实施例 二提供的数据还原方法流程图。 如图 3所示， 本发明实施例提供的方法包括： S301, 接收通过基于通用公共无线接口 CPRI协议的传输格式发送的第一 压缩信号， 所述第一压缩信号是对第一数字信号进行降采样处理获得的， 所 述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字 信号的基带截止频率的两倍。
所述第一数字信号为采用不小于两倍码片速率的采样频率进行采样获得 的数字信号。
具体地， BBU (或 RRU )通过 CPRI接收到 RRU (或 BBU )发送的第一压缩 信号， 该第一压缩信号为经过降频处理的压缩信号， 并且第一压缩信号的采 样频率满足奈奎斯特采样定理， 即其采样频率为第一数字信号基带截止频率 的两倍以上， 即如果第一压缩信号基带截止频率为 2. 34MHz , 则降采样频率必 需大于 3. 68MHz。 从而保证下一步骤可以对第一压缩信号进行恢复。
S 302,对所述第一压缩信号进行上采样处理， 获得第二信号。 所述第二信 号可以为第一数字信号， 也可以为和第一数字信号不同的信号。
具体地， 可以通过差值和抽取对其进行上采样处理， 可以将第一压缩信 号恢复为降采样之前的状态。 所述第一数字信号的采样频率一般不小于 7. 68 MHz , 为便于后续硬件处理的方便， 通常为 7. 68MHz。 需要说明的是， 本发明 实施例提供的数据压缩方法既可以用于 BBU中， 可以用于 RRU中。 也可以用 于本领域中其它相关***中。 可见， 由于恢复信号时不需要依赖前后数据的 关系， 因此不会发生数据失步， 从而避免较高的误码率。
上述实施例描述的为， 通过 CPRI接收通过降采样获得的第一压缩信号； 对所述第一压缩信号进行上采样处理， 获得第二信号。 由于可以对通过 CPRI 接收到的第一压缩信号恢复成其降采样之前的状态， 用于后续的处理， 由此 实现了可以减少在 CPRI上传输的数据量， 提高了数据传输效率， 或者说增加 了单位 CPRI上可支持的 RRU或 BBU的个数。
相应地，本发明实施例提供了一种与数据压缩方法对应的数据压缩装置。 图 4是本发明实施例三提供的数据压缩装置示意图。 如图 4所示， 本发明实 施例提供的装置包括： 获取单元 401、 处理单元 402和发送单元 403。 获取单元 401 , 用于获取第一数字信号。
处理单元 402 , 用于对所述第一数字信号进行降采样处理， 获取第一压缩 信号， 其中， 所述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值 为所述第一数字信号基带截止频率的两倍。
发送单元 403 , 用于将所述第一压缩信号通过基于 CPRI协议的传输格式 发送。
其中，所述获取单元 401获取的所述第一数字信号为采用不小于两倍码片 速率的采样频率对滤波信号进行采样获得的数字信号。
所述处理单元 402 通过插值和抽取对所述第一数字信号进行所述降采样 处理。
需要说明的是,本发明实施例提供的装置植入上述实施例一提供的数据压 缩方法， 因此， 本发明实施例提供的装置的具体工作过程在此不再赘述。
上述是实施例描述的为，通过获取单元 401获取第一数字信号；处理单元 402对所述第一数字信号进行降采样处理， 获取第一压缩信号； 发送单元 403 将所述第一压缩信号通过基于 CPRI协议的传输格式发送。 由于在将数据通过 CPRI协议传输之前进行降频，从而实现了减少在 CPRI上传输的数据量， 提高 了数据传输效率， 或者说增加了单位 CPRI上可支持的 RRU或 BBU的个数。
相应地， 本发明实施例提供了一种与数据还原方法对应的数据还原装置。 图 5是本发明实施例四提供的数据还原装置示意图。 如图 5所示， 本发明实 施例提供的装置包括： 获取单元 501和处理单元 502。
获取单元 501 , 用于接收通过基于通用公共无线接口 CPRI协议的传输格 式发送的第一压缩信号， 所述第一压缩信号是对第一数字信号进行降采样处 理获得的， 所述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为 所述第一数字信号的基带截止频率的两倍
处理单元 502 ,用于对所述获取单元 501接收的所述第一压缩信号进行上 采样处理， 获得第二信号。 所述处理单元 502 通过插值和抽取对所述第一数字压缩信号进行所述上 采样处理。
需要说明的是,本发明实施例提供的装置植入上述实施例二提供的数据还 原方法， 因此， 本发明实施例提供的装置的具体工作过程在此不再赘述。
上述是实施例描述的为， 获取单元 501通过 CPRI接收通过降采样获得的 第一压缩信号； 处理单元 502对所述获取单元 501接收的所述第一压缩信号 进行上采样处理， 获得第二信号。 由于可以对通过 CPRI接收到的第一压缩信 号恢复成其降采样之前的状态，用于后续的处理，由此实现了可以减少在 CPRI 上传输的数据量， 提高了数据传输效率， 或者说增加了单位 CPRI上可支持的 RRU或 BBU的个数。
相应地， 本发明实施例还提供了一种射频拉远单元 RRU，包括上述实施例 三中的数据压缩装置或 /和上述实施例四种的数据还原装置。
相应地， 本发明实施例提供了一种基带单元 BBU, 包括上述实施例三中的 数据压缩装置或 /和上述实施例四中的数据还原装置。
相应地， 本发明实施例提供了一种与数据压缩方法对应的另一种数据压 缩装置。 图 6是本发明实施例五提供的数据压缩装置示意图。 如图 6所示， 本发明实施例提供的装置包括： 网络接口 61、 处理器 62和存储器 63。 *** 总线 64用于连接网络接口 61、 处理器 62和存储器 63。
网络接口 61用于与所述数据压缩装置和其它装置的通信。
存储器 63可以是永久存储器， 例如硬盘驱动器和闪存， 存储器 63中具 有软件模块和设备驱动程序。 软件模块能够执行本发明上述方法的各种功能 模块； 设备驱动程序可以是网络和接口驱动程序。
在启动时， 这些软件组件被加载到存储器 63中， 然后被处理器 62访问 并执行如下指令：
获取第一数字信号；
对所述第一数字信号进行降采样处理， 获取第一压缩信号， 其中， 所述 第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字信 号基带截止频率的两倍；
将所述第一压缩信号通过基于 CPRI协议的传输格式发送。
其中，所述第一数字信号为采用不小于两倍码片速率的采样频率进行采样 获得的数字信号。
所述网络接口 61具体为 CPRI。
通过插值和抽取对所述第一数字信号进行所述降采样处理。
上述是实施例描述的为， 通过获取第一数字信号； 对所述第一数字信号 进行降采样处理， 获取第一压缩信号； 将所述第一压缩信号通过基于 CPRI协 议的传输格式发送。 由于在将数据通过 CPRI协议传输之前进行降频， 从而实 现了减少在 CPRI上传输的数据量， 提高了数据传输效率， 或者说增加了单位 CPRI上可支持的 RRU或 BBU的个数。
相应地， 本发明实施例提供了一种与数据还原方法对应的另一种数据还 原装置。 图 7是本发明实施例六提供的数据还原装置示意图。 如图 7所示， 本发明实施例提供的装置包括： 网络接口 71、 处理器 72和存储器 73。 *** 总线 74用于连接网络接口 71、 处理器 72和存储器 73。
网络接口 71用于与所述数据还原装置与其它装置的通信。
存储器 73可以是永久存储器， 例如硬盘驱动器和闪存， 存储器 73中具 有软件模块和设备驱动程序。 软件模块能够执行本发明上述方法的各种功能 模块； 设备驱动程序可以是网络和接口驱动程序。
在启动时， 这些软件组件被加载到存储器 73中， 然后被处理器 72访问 并执行如下指令：
通过 CPRI接收通过降采样获得的第一压缩信号， 所述第一压缩信号的采 样频率不小于频率阈值； 所述频率阈值为第一数字信号基带截止频率的两倍。
对所述第一压缩信号进行上采样处理， 获得第二信号。
其中， 所述第一数字信号为采用不小于两倍码片速率的采样频率进行采 样获得的数字信号。
所述网络接口 71具体为 CPRI。
通过插值和抽取对所述第一压缩信号进行所述上采样处理。
上述是实施例描述的为，通过 CPRI接收通过降采样获得的第一压缩信号； 对所述第一压缩信号进行上采样处理， 获得第二信号。 由于可以对通过 CPRI 接收到的第一压缩信号恢复成其降采样之前的状态， 用于后续的处理， 由此 实现了可以减少在 CPRI上传输的数据量， 提高了数据传输效率， 或者说增加 了单位 CPRI上可支持的 RRU或 BBU的个数。
本发明实施例还提供了一种数据传输***， 包括上述实施例三中的数据 压缩装置， 或上述实施例五中的数据压缩装置。
所述***还包括上述实施例四中的数据还原装置， 或上述实施例六中 的数据还原装置。
专业人员应该还可以进一步意识到， 结合本文中所公开的实施例描述的 各示例的单元及算法步骤， 能够以电子硬件、 计算机软件或者二者的结合来 实现， 为了清楚地说明硬件和软件的可互换性， 在上述说明中已经按照功能 一般性地描述了各示例的组成及步骤。 这些功能究竟以硬件还是软件方式来 执行， 取决于技术方案的特定应用和设计约束条件。 专业技术人员可以对每 个特定的应用来使用不同装置来实现所描述的功能， 但是这种实现不应认为 超出本发明的范围。
结合本文中所公开的实施例描述的装置或算法的步骤可以用硬件、 处理 器执行的软件模块， 或者二者的结合来实施。 软件模块可以置于随机存储器 ( RAM ) 、 内存、 只读存储器（ROM ) 、 电可编程 R0M、 电可擦除可编程 R0M、 寄存器、 硬盘、 可移动磁盘、 CD-R0M、 或技术领域内所公知的任意其它形式 的存储介质中。
以上所述的具体实施方式， 对本发明的目的、 技术方案和有益效果进行 了进一步详细说明， 所应理解的是， 以上所述仅为本发明的具体实施方式而 已， 并不用于限定本发明的保护范围， 凡在本发明的精神和原则之内， 所做 的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种数据压缩方法， 其特征在于， 所述方法包括：
获取第一数字信号；
对所述第一数字信号进行降采样处理， 获取第一压缩信号， 其中， 所述 第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字信 号的基带截止频率的两倍；
将所述第一压缩信号通过基于通用公共无线接口 CPRI协议的传输格式发 送。
2. 如权利要求 1所述的数据压缩方法， 其特征在于， 通过插值和抽取对 所述第一数字信号进行所述降采样处理。
3. 如权利要求 1所述的数据压缩方法， 其特征在于， 所述第一数字信号 为采用不小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信 号。
4. 一种数据还原方法， 其特征在于， 所述方法包括：
接收通过基于通用公共无线接口 CPRI协议的传输格式发送的第一压缩信 号， 所述第一压缩信号是对第一数字信号进行降采样处理获得的， 所述第一 压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字信号的 基带截止频率的两倍；
对所述第一压缩信号进行上采样处理， 获得第二信号。
5. 如权利要求 4所述的数据还原方法， 其特征在于， 通过插值和抽取对 所述第一压缩信号进行所述上采样处理。
6. 如权利要求 4所述的数据还原方法， 其特征在于， 所述第一数字信号 为采用不小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信 号。
7. 一种数据压缩装置， 其特征在于， 所述装置包括：
获取单元， 用于获取第一数字信号； 处理单元， 用于对所述第一数字信号进行降采样处理， 获取第一压缩信 号， 其中， 所述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为 所述第一数字信号基带截止频率的两倍；
发送单元，用于将所述第一压缩信号通过基于 CPRI协议的传输格式发送。
8. 如权利要求 7述的数据压缩装置， 其特征在于， 所述处理单元通过插 值和抽取对所述第一数字信号进行所述降采样处理。
9. 如权利要求 7述的数据压缩装置， 其特征在于， 所述获取单元获取的 所述第一数字信号为采用不小于两倍码片速率的采样频率对滤波信号进行采 样获得的数字信号。
10. 一种数据还原装置， 其特征在于， 所述装置包括：
接收单元， 用于接收通过基于通用公共无线接口 CPRI协议的传输格式发 送的第一压缩信号， 所述第一压缩信号是对第一数字信号进行降采样处理获 得的， 所述第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述 第一数字信号的基带截止频率的两倍；
处理单元， 用于对所述获取单元接收的所述第一压缩信号进行上采样处 理， 获得第二信号。
11. 如权利要求 10所述的数据还原装置，其特征在于，所述处理单元通过 插值和抽取对所述第一压缩信号进行所述上采样处理。
12. 如权利要求 10述的数据还原装置，其特征在于，所述第一数字信号为 采用不小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
13. 一种射频拉远单元 RRU，其特征在于， 包括如权利要求 7所述的数据压 缩装置。
14. 如权利要求 13所述的 RRU, 其特征在于， 还包括如权利要求 10所述的 数据还原装置。
15. 一种基带单元 BBU, 其特征在于， 包括如权利要求 7所述的数据压缩 装置。
16. 如权利要求 15所述的 BBU, 其特征在于， 还包括如权利要求 10所述的 数据还原装置。
17. 一种数据压缩装置， 其特征在于， 所述装置包括：
处理器；
存储器；
***总线；
所述***总线用于连接所述处理器和所述存储器； 所述存储器中存储应 获取第一数字信号；
对所述第一数字信号进行降采样处理， 获取第一压缩信号， 其中， 所述 第一压缩信号的采样频率不小于频率阈值； 所述频率阈值为所述第一数字信 号基带截止频率的两倍；
将所述第一压缩信号通过基于 CPRI协议的传输格式发送。
18. 如权利要求 17所述数据压缩装置，其特征在于，通过插值和抽取对所 述第一数字信号进行所述降采样处理。
19. 如权利要求 17所述数据压缩装置，其特征在于，所述第一数字信号为 采用不小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
20. —种数据还原装置， 其特征在于， 所述装置包括：
处理器；
存储器；
***总线；
所述***总线用于连接所述处理器和所述存储器；
所述存储器中存储应用程序， 所述应用程序包括可用于使所述处理器和 所述***执行以下过程的指令：
通过 CPRI接收通过降采样获得的第一压缩信号， 所述第一压缩信号的采 样频率不小于频率阈值； 所述频率阈值为第一数字信号基带截止频率的两倍； 对所述第一压缩信号进行上采样处理， 获得第二信号。
21. 如权利要求 20所述数据还原装置，其特征在于，通过插值和抽取对所 述第一压缩信号进行所述上采样处理。
22. 如权利要求 20所述数据还原装置，其特征在于，所述第一数字信号为 采用不小于两倍码片速率的采样频率对滤波信号进行采样获得的数字信号。
23. 一种数据传输的***， 其特征在于， 包括如权利要求 7或如权利要求 17所述的数据压缩装置。
24. 根据权利要求 23所述的***，其特征在于，还包括如权利要求 10或如 权利要求 20所述的数据还原装置。
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