CN101425818B - Method and system for ultra-wideband communication frequency domain equalization - Google Patents
Method and system for ultra-wideband communication frequency domain equalization Download PDFInfo
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Abstract
The invention discloses a send terminal method of the frequency domain balance of super broadband communication, which comprises the following steps: the symbol mapping of MBOK is carried out to the data to be sent; MBOK spread spectrum codes of mutual orthogonal intersection are selected according to a mapped symbol; circulation prefix processing is carried out to the data to be sent; filtration or filtration shaping processing is carried out to the data to be sent; and the data to be sent is sent to a receiving terminal by RFs. The invention also discloses a receiving terminal method and a system of the frequency domain balance of super broadband communication, adopts a multi-band double-orthogonal-intersection spread spectrum mode for the spread spectrum, combines with the frequency domain balance technology of low complexity, lowers the complexity of the signal processing in broadband communication, has better multi-path signal processing performance, solves the problem of balance ratio and has low power consumption and complexity. Meanwhile, the processing of the frequency domain balance is carried out before the MBOK dispreading at the receiving terminal, and high demodulation gain is obtained. In addition, the invention can lower the hardware complexity in a long time-delay channel.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of method and system of ultra-wideband communication frequency domain equalization.
Background technology
Broadband wireless communications is because its information rate is high, the broader bandwidth of signal; And wireless transmission channel all has multipath characteristics; This can cause frequency selective fading, and causes the intersymbol of data-signal to produce the interference that superposes, and influences judgement and the reduction of receiving terminal to signal.Thereby need overcome multipath and disturb the influence that transmission error is caused.Traditional method is to adopt the processing of time domain equalization, and time-domain equalizer commonly used has linear equalizer, DFF or the like.When the speed ratio of communicating by letter was lower, time-domain equalizer can reduce the influence of multipath.
Except time domain equalization mode commonly used; OFDM (OrthogonalFrequency Division Multiplexing commonly used; OFDM) or the communication mode of DSSS (DirectSequence Spread Spectrum, DSSS) come influence that anti-multipath is disturbed.OFDM adopts the mode that is divided into the broadband some very narrow subcarriers; Tackle the decline of frequency selectivity; When the bandwidth of subcarrier is very little; Multipath disturbs and just is transformed into the just decline of signal, can't cause intersymbol data to be disturbed, and so just can resist multipath and disturb the influence that data-signal is caused.DSSS also can be used for resisting the interference of multipath, and the method for employing is the multichannel stack (RAKE) of multipath signal.This mode can be carried out each path of multipath signal the processing of addition, makes concentration of energy.Its principle is when spread-spectrum signal is communicated by letter, and utilizes the characteristic of the low cross correlation of frequency expansion sequence, under the situation that has multipath to disturb, the signal of each multipath is generated separable independent channel, adds and obtain the energy of each subchannel then.
In realizing process of the present invention, the inventor finds to exist at least in the prior art following problem: when the time delay of channel was long, time domain equalization was owing to be the signal processing of serial, so it can cause the hardware complexity of very high signal processing.Particularly current data communication becomes more and more faster, adopts time domain equalization can strengthen the requirement to hardware process speed, thereby causes the limitation in its application.
The shortcoming of OFDM is that hardware configuration is quite complicated, and it is also high to consume energy.Is hundreds and thousands of number of sub-carrier (being made as n) because signal isolates, when the polarity of all signals was all identical, the amplitude of total signal just be original n times.With regard to having the amplitude stack problem of signal, be referred to as peak-to-average force ratio problem (PAPR) like this.The peak-to-average force ratio problem makes the emission power consumption increase by ten several times, and also the linearity to automatic electric-level control (AGC) control and HFS circuit has proposed very high requirement.
Adopt the DSSS communication of RAKE that limitation is also arranged.According to the operation principle of RAKE, it need guarantee correlation properties by long spreading code, is the length that multipath length preferably is no more than its single spread symbol in theory.This will significantly reduce the peak data rate of communication.And owing to need extra channel estimation circuit, its hardware complexity is also than higher.Be unfavorable for datel circuit design at a high speed, its task performance depends on the way in footpath simultaneously, and under the many especially situation of the way of multipath, the processing complexity of RAKE further improves.
Summary of the invention
The problem that the embodiment of the invention will solve provides a kind of method and system of ultra-wideband communication frequency domain equalization; To overcome in the prior art when carrying out broadband wireless communications; Handle the high defective of complexity of the hardware of multipath signal, and further improve the gain that multipath signal is handled.
For achieving the above object, the technical scheme of the embodiment of the invention provides a kind of transmitting terminal method of ultra-wideband communication frequency domain equalization, may further comprise the steps:
A. data to be sent are carried out the sign map of MBOK (M-ary Bi-Orthogonal Keying, polynary biorthogonal keying);
B. according to mapped symbol, select mutually orthogonal MBOK spreading code;
C. said data to be sent are carried out circulation prefix processing;
D. said data to be sent are carried out the processing of filtering and Waveform shaping;
E. said data to be sent are sent to receiving terminal through radio frequency.
Wherein, in said step B, after selecting mutually orthogonal MBOK spreading code, also comprise: use the positive-negative polarity modulation to increase information bit.
Wherein, in said step B, said MBOK spreading code is taken from Walsh or Gold sign indicating number.
Wherein, in said step C, said circulation prefix processing comprises the reconstruction of adding Cyclic Prefix or Cyclic Prefix.
Wherein, said data to be sent are through the digital baseband data after the chnnel coding.
The technical scheme of the embodiment of the invention also provides a kind of receiving terminal method of ultra-wideband communication frequency domain equalization, may further comprise the steps:
S1. through radio frequency reception data, and with said data transaction is digital signal;
S2. said data are carried out filtering;
S3. remove the Cyclic Prefix of said data, and said data are carried out frequency domain equalization handle;
S4. said data are carried out the despreading of MBOK spread-spectrum signal;
S5. select the symbol of transmitting terminal the data after despreading.
Wherein, in said step S4, the said M road interlock circuit simultaneously that adopts carries out relevant with the digital signal that receives.
Wherein, in said step S5, selecting a road of correlation magnitude maximum is the symbol of transmitting terminal.
Wherein, in said step S5, also comprise: adopt polarity to distinguish information symbol.
The technical scheme of the embodiment of the invention also provides a kind of system of ultra-wideband communication frequency domain equalization, and said system comprises transmitting terminal and receiving terminal, and said transmitting terminal comprises:
The sign map unit is used for data to be sent are carried out the sign map of MBOK;
The spreading code selected cell is used for according to mapped symbol, selects mutually orthogonal MBOK spreading code;
The circulation prefix processing unit is used for said data to be sent are carried out circulation prefix processing;
The transmitting filter unit is used for said data to be sent are carried out the processing of filtering and Waveform shaping;
Rf transmitter unit is used for said data to be sent are sent to receiving terminal through radio frequency;
Said receiving terminal comprises:
Rf receiver unit is used for receiving data through radio frequency, and is digital signal with said data transaction;
The receiving filter unit is used for said data are carried out filtering;
Go cyclic prefix unit, be used to remove the Cyclic Prefix of said data, and said data are carried out frequency domain equalization handle;
Despread unit is used for said data are carried out the despreading of MBOK spread-spectrum signal;
Maximum and symbol selected cell are used for choosing maximum from the relevant value of despreading, and judge its value of symbol.
Compared with prior art, technical scheme of the present invention has following advantage:
1, the problem that does not have peak-to-average force ratio greatly reduces the requirement of the linearity of radio-frequency devices like this, has reduced equipment cost and hardware complexity, and OFDM mode relatively, and its performance increases on the contrary, and the BPSK that bit error rate performance is superior to AWGN under modulates.Significantly reduce simultaneously the power consumption (10dB of OFDM radio-frequency power rollback) of radio communication, be particularly suitable for battery powered handheld device.
2, adopt frequency domain equalization to combine the low complex degree modulation of MBOK, can obtain frequency diversity gain, channel despreading gain and MBOK modulation gain, it is at E
b/ N
0The gain many above the ber curve 3dB of BPSK modulation under the AWGN (being not counted in the chnnel coding gain) arranged under the coordinate.The processing gain that exceeds RAKE receiver far away.And the spreading ratio of MBOK is low, helps improving data rate.
3, the channel multi-path long delay time,, solved the problem of the hardware handles complexity of time domain equalization, so be suitable for the occasion of the radio communication of high speed, long multidiameter delay because this programme has adopted frequency domain equalization.Its effect of saving hardware costs is fairly obvious.
Description of drawings
Fig. 1 is the sketch map of a kind of ultra broadband MBOK frequency-domain equalization technology of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, specific embodiments of the invention describes in further detail.Following examples are used to explain the present invention, but are not used for limiting scope of the present invention.
The sketch map of a kind of ultra broadband MBOK frequency-domain equalization technology of the embodiment of the invention is as shown in Figure 1, comprises following process:
In the present embodiment, base band data at first through the sign map of MBOK, is selected mutually orthogonal MBOK spreading code according to mapped symbol then and is represented different symbols.This different MBOK orthogonal code is taken from Walsh, Gold sign indicating number (perhaps correlation is good, the spreading code that code character is many), the perhaps similarly set of orthogonal intersection, and use the positive-negative polarity modulation to increase information bit.
Carry out MBOK spreading code mapping and select after, in order to overcome the influence of multipath, satisfy the condition of circular convolution so that accomplish the equilibrium of frequency domain, need to add Cyclic Prefix at receiving terminal.The length of the Cyclic Prefix that adds confirms that according to the maximum time scope that multipath disturbs the length of the data block that each Cyclic Prefix is corresponding is determined by the acceptable data user rate.In addition, also can adopt other similar techniques,, can not add Cyclic Prefix like this, but effect all is to handle for the frequency domain equalization that carries out receiving terminal, and satisfy the circular convolution characteristic like the reconstruction of Cyclic Prefix.
In order to set up the frequency domain filtering of no intersymbol interference in the sending and receiving end, send signal through normal transmitting filter, filtering out of band signal, and the processing of carrying out Waveform shaping.Can carry out the emission of wireless signal by the radio-frequency transmissions circuit afterwards.This radiating circuit through after the up-conversion of carrier modulation, transforms to radio frequency band with digital baseband signal, carries out radiation by antenna at last and sends.This radiating circuit also can comprise the emission of the high-frequency digital baseband signal of carrierfree modulation.
After through wireless multipath channel, receiving terminal at first carries out the reception of radio frequency, just obtains the baseband signal of numeral.This baseband signal is analog signal at this moment, after through the analog to digital converter sampling, becomes digital signal.Filter filtering band through receiving terminal disturbs outward again.After removing Cyclic Prefix, carry out the frequency domain equalization of receiving terminal again and handle.The effect of frequency domain equalization is an inverse filter of doing channel, removes multipath and disturbs the intersymbol interference that causes.
Subsequently; Carry out the despreading work of MBOK spread-spectrum signal again; Through despreading, obtain channel despreading gain, despreading adopts M road interlock circuit simultaneously to carry out relevant with the digital signal that receives; Get a road of correlation magnitude maximum and declare, and adopt polarity to come further differentiation information symbol as the symbol of making a start.
The present invention uses the modem section in radio communication, after the digital baseband data process chnnel coding that information source is sent here, carries out the MBOK sign map of this programme and the interpolation of Cyclic Prefix.At receiving terminal, after the baseband signal digitlization, remove Cyclic Prefix, the data behind the execution frequency domain equalization are given the channel decoding part, and the data after the channel decoding are exactly the original data-signal that receives reduction through receive-transmit system.
Use occasion of the present invention is applicable to broadband and channel condition more complicated, that is: environment multipath that electromagnetic wave is caused disturbs occasion more intense and that time delay is long, so generally be applicable under the wireless environment.And when the speed of information about 1Mbps or in higher (broadband connections), native system can reduce the complexity of communication system, reduces cost.
Application example of the present invention is under the ultra broadband condition, and the speed of information is very high, and the complexity of system is very big to the hardware cost influence, and the information rate of ultra broadband very high (about 100Mbps).At this time adopt the modulation system of MBOK+FDE, can alleviate the spread spectrum pressure of base band and the complexity of equalizing system greatly.Need not the processing of RAKE or peak-to-average force ratio also can obtain than DSSS and the better base band error performance of OFDM.Being particularly suitable for handheld device etc. is the wireless device of the energy with the battery, therefore has remarkable economical and is worth and wide application prospect.
The present invention has adopted the spread spectrum of multi-system biorthogonal spreading code (MBOK) mode, and combines the frequency-domain equalization technology (FDE) of low complex degree.The complexity of signal processing when low broadband connections has fallen in the present invention provides simultaneously than multipath signal in the past and handles more performance.The invention solves the problem of peak-to-average force ratio, have lower power consumption and complexity; And in the present invention, frequency domain equalization combines MBOK, has very high demodulation gain; In addition, at the channel of long delay, adopt the present invention can reduce hardware complexity.
MBOK spread spectrum mode comes down to operation that channel impulse response is sampled.Utilize this unique character, we are employed in the receiving terminal demodulation design that frequency domain equalization is carried out in the MBOK despreading before, and it can receive very big channel despreading gain.Variation has taken place because get the actual characteristic of channel in such processing, significantly reduces the interference characteristic of multipath signal, makes that the deep fade on the multipath frequency domain has not existed, and has improved the lowest signal-to-noise that signal receives greatly, has improved the performance of communication system.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from know-why of the present invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (10)
1. the transmitting terminal method of a ultra-wideband communication frequency domain equalization is characterized in that, may further comprise the steps:
A. data to be sent are carried out the sign map of MBOK;
B. according to mapped symbol, select mutually orthogonal MBOK spreading code;
C. the data to be sent after the sign map are carried out circulation prefix processing;
D. the data to be sent after the circulation prefix processing are carried out the processing of filtering and Waveform shaping;
E. the data to be sent after filtering and the Waveform shaping processing are sent to receiving terminal through radio frequency.
2. the transmitting terminal method of ultra-wideband communication frequency domain equalization according to claim 1 is characterized in that, in said step B, after selecting mutually orthogonal MBOK spreading code, also comprises: use the positive-negative polarity modulation to increase information bit.
3. the transmitting terminal method of ultra-wideband communication frequency domain equalization according to claim 1 or claim 2 is characterized in that in said step B, said MBOK spreading code is taken from Walsh or Gold sign indicating number, the spreading code that perhaps other correlation is good, code character is many.
4. the transmitting terminal method of ultra-wideband communication frequency domain equalization according to claim 1 is characterized in that, in said step C, said circulation prefix processing comprises the reconstruction of adding Cyclic Prefix or Cyclic Prefix.
5. the transmitting terminal method of ultra-wideband communication frequency domain equalization according to claim 1 is characterized in that, said data to be sent are for through the digital baseband data after the chnnel coding.
6. the receiving terminal method of a ultra-wideband communication frequency domain equalization is characterized in that, may further comprise the steps:
S1. through radio frequency reception data, and with said data transaction is digital signal;
S2. the data after the conversion are carried out filtering;
S3. remove the Cyclic Prefix of the data after the Filtering Processing, and carry out frequency domain equalization and handle removing data behind the Cyclic Prefix;
S4. the data after frequency domain equalization being handled are carried out the despreading of MBOK spread-spectrum signal;
S5. select the symbol of transmitting terminal the data after despreading.
7. like the receiving terminal method of the said ultra-wideband communication frequency domain equalization of claim 6, it is characterized in that, in said step S4, adopt M road interlock circuit simultaneously to carry out relevant with the digital signal that receives.
8. like the receiving terminal method of the said ultra-wideband communication frequency domain equalization of claim 7, it is characterized in that in said step S5, selecting a road of correlation magnitude maximum is the symbol of transmitting terminal.
9. like the receiving terminal method of claim 7 or 8 said ultra-wideband communication frequency domain equalizations, it is characterized in that, in said step S5, also comprise: adopt polarity to distinguish information symbol.
10. the system of a ultra-wideband communication frequency domain equalization is characterized in that, said system comprises transmitting terminal and receiving terminal,
Said transmitting terminal comprises:
The sign map unit is used for data to be sent are carried out the sign map of MBOK;
The spreading code selected cell is used for according to mapped symbol, selects mutually orthogonal MBOK spreading code;
The circulation prefix processing unit is used for the data to be sent after the sign map are carried out circulation prefix processing;
The transmitting filter unit is used for the data to be sent after the circulation prefix processing are carried out the processing of filtering and Waveform shaping;
Rf transmitter unit is used for the data to be sent after filtering and the Waveform shaping processing are sent to receiving terminal through radio frequency;
Said receiving terminal comprises:
Rf receiver unit is used for receiving data through radio frequency, and is digital signal with said data transaction;
The receiving filter unit is used for the data after the conversion are carried out filtering;
Go cyclic prefix unit, be used to remove the Cyclic Prefix of the data after the Filtering Processing, and carry out frequency domain equalization and handle removing data behind the Cyclic Prefix;
Despread unit is used for the data after the frequency domain equalization processing are carried out the despreading of MBOK spread-spectrum signal;
Maximum and symbol selected cell are used for choosing maximum from the relevant value of despreading, and judge its value of symbol.
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| CN103001916B (en) * | 2012-11-30 | 2015-05-20 | 南京邮电大学 | Time domain reshaping method of orthogonal frequency division multiplexing (OFDM) communication system |
| CN111884761B (en) * | 2020-07-14 | 2021-08-31 | 中国电子科技集团公司第五十四研究所 | Data transmission method for transmitting end of single carrier frequency domain equalization system |
| CN116366091A (en) * | 2022-12-23 | 2023-06-30 | 北京环佳通信技术有限公司 | Distributed frequency domain spreading method and despreading method for self-organizing network scene |
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| CN101138159A (en) * | 2004-11-10 | 2008-03-05 | 脉冲互联有限公司 | Ultra-wideband communication apparatus and methods |
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Non-Patent Citations (5)
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| Parihar, A.，et al..Equalization for DS-UWB Systems-PartⅡ:4BOK Modulation.《IEEE Transactions on Communications》.2007,第55卷(第8期),1525-1535. * |
| 孟静.MBOK扩频调制技术及基于FPGA的实现研究.《南京理工大学优秀毕业论文》.2005, * |
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| 衡量等.低复杂度的MBOK DS-UWB接收机同步跟踪算法.《清华大学学报(自然科学版)》.2008,第48卷(第4期),第562-566页. * |
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