CN101060515A - OFDM system signal receiving and sending method and its device - Google Patents
OFDM system signal receiving and sending method and its device Download PDFInfo
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Abstract
The related signal dispatching method in OFDM system comprises: on transmission end, multiplying frequency with frequency multiplication code, then dividing signal into every time and frequency 2D time-frequency block for transmission; embedding guide frequency signal into the transmitted signal for coherent demodulation. This invention makes OFDM signal have well anti-interference capacity and resistance to frequency-and time-selective attenuation.
Description
Technical field
The present invention relates to moving communicating field, particularly OFDM (OrthogonalFrequency Division Multiplexing is called for short " OFDM ") technology.
Background technology
In the last few years, be subjected to people's extensive concern for the multi-carrier transmission technology of representative with OFDM (Orthogonal Frequency Division Multiplexing is called for short " OFDM ").Multi-carrier transmission is decomposed into several independently sub data flows to data flow, and each sub data flow will have much lower bit rate.The low rate multimode symbol that forms with such low bit rate removes to modulate corresponding subcarrier, has just constituted the transmission system that a plurality of low rate symbol parallels send.
OFDM transmits the encoded back of data as a kind of multi-carrier digital modulation technique at frequency domain.Single-carrier technology unlike routine, as amplitude modulation/frequency modulation (Amplitude Modulation/FrequencyModulation, be called for short " AM/FM "), at a time only send single signal with single-frequency, OFDM sends the multipath high-speed signal simultaneously on through the special orthogonal frequency that calculates.
OFDM is again as a kind of multiplex technique, with multi-way signal multiplexing on the different orthogonal subcarrier.Traditional frequency division multiplexing (Frequency Division Multiplexing is called for short " FDM ") technology is divided into several subchannels with bandwidth, and the centre reduces interference with the protection frequency band, and they send data simultaneously.Ofdm system is wanted much less than the bandwidth of traditional FDM system requirements.Because use noiseless quadrature carrier technology, single intercarrier need not to protect frequency band.Make that like this service efficiency of usable spectrum is higher.In addition, the OFDM technology can dynamically be distributed in the data on the subchannel.For obtaining maximum data throughout, multi-carrier modulator can distribute more data intelligently to the little subchannel of noise.
OFDM will through the coding data to be transmitted as frequency domain information, it is modulated to time-domain signal, and, then carries out the inverse process demodulation at receiving terminal in channel.The modulation and demodulation of ofdm system can be respectively by contrary discrete Fourier transform (DFT) (Inverse Discrete Fourier Transform, be called for short " IDFT ") and discrete Fourier transform (DFT) (Discrete Fourier Transform, abbreviation " DFT ") replace.By N point IDFT computing, be the frequency domain data sign reversing time domain data symbol, through after the carrier modulation, send in the channel.At receiving terminal, received signal is carried out coherent demodulation, then baseband signal is carried out N point DFT computing, the data symbol that can obtain to send.In actual applications, IDFT/DFT adopts contrary fast fourier transform (Inverse Fast Fourier Transform is called for short " IFFT ") and fast fourier transform (Fast Fourier Transform is called for short " FFT ") to realize.The employing of FFT technology makes the complexity of ofdm system reduce greatly, add the high-performance information processing device such as programmable logic device (Programmable Logic Device, abbreviation " PLD "), digital signal processor (Digital Signal Processor, abbreviation " DSP "), microprocessor (MicroProcessor, abbreviation " μ P ") etc. development and application, make the realization of ofdm system be more prone to, become most widely used a kind of multi-carrier transmission scheme.
The intersymbol interference that the OFDM technology can be resisted multipath transmisstion effectively and caused (Inter SymbolInterference is called for short " ISI "), its implementation complexity is little more a lot of than the single-carrier system that adopts equalizer.In addition, the information bit that ofdm system can recently transmit on each subcarrier of optimized distribution according to the noise of each subcarrier, thus improve the capacity of system transmissions information greatly.Equally also there is certain shortcoming in the use of OFDM technology, in the reverse transfer that moves at honeycomb, especially in the reverse control signal transmission, because many mobile subscribers own same frequency resource together, thereby causes the phase mutual interference between the user easily.
In the standard of IEEE802.20, in order to improve for example communication efficiency of control signal of low-rate signal, high pass (Qualcomm) company has proposed a kind of scheme of WALSH sign indicating number (walsh code) mapping of employing 1024 bit long, as shown in Figure 1.Wherein, signal for each control channel, as channel quality indication (Channel Quality Indicator, abbreviation " CQI ") 10 bit signals, at first carry out HADAMARD (Hadamard) mapping, promptly select wherein delegation or row from 1024 * 1024 HADAMARD orthogonal matrix, obtain the WALSH sign indicating number of one 1024 bit long, this WALSH sign indicating number is again by a scrambler scrambling.This scrambling is in order to distinguish other channel, thereby the scrambler of different channels is different.Afterwards, the WALSH sign indicating number by scrambling with different channels carries out the addition merging.1024 bits after the merging are further by scrambling, and this scrambler is to be used to distinguish different users, cellular cell or sector.1024 bits of exporting after the scrambling are divided into 8 sub-pieces, and each sub-piece contains 128 bits, each sub-piece are carried out 128 FFT conversion again, export 128 complex values, and 1024 complex values that obtain at last are carried on 128 subcarriers and 8 symbols.
In actual applications, there is following problem in such scheme: during by the ofdm system transmission signals, can't guarantee spread-spectrum signal that receiving terminal receives quadrature still, the reliability of transmission can not get ensureing.
Cause the main cause of this situation to be, because there is intrinsic frequency selective fading in ofdm system, and there is intrinsic time selective fading in the mobile communication, make different sub carrier produce the weak of different amplitudes at different time, and then make the WALSH orthogonal code of 1024 bit long that control channel transmitted, thereby make receiver descend greatly to the receptivity of control channel at receiving terminal quadrature no longer.In addition, because 10 bit informations of control channel do not adopt error correction coding protection, and receiver employing non-coherent demodulation, all make transmission reliability descend.
Summary of the invention
In view of this, main purpose of the present invention is to provide signal transmit-receive method and the device thereof in a kind of ofdm system, makes ofdm signal not only have antijamming capability but also be highly resistant to frequency selective fading and time selective fading.
For achieving the above object, the invention provides the signaling method in a kind of ofdm system, comprise following steps:
The signal that transmitting terminal will send carries out spread spectrum with spreading code, and will send in each time-frequency piece through the division of signal of spread spectrum, the time that described time-frequency piece is made up of continuous sub-carriers and continuous symbol and the two-dimensional block of frequency.
Wherein, also comprise following steps:
Described transmitting terminal will become sub-piece through the division of signal of spread spectrum, and the length of the short spreading code of the size of each sub-piece correspondence and use is identical, and each sub-piece sends by a described time-frequency piece respectively.
In this external described method, when described transmitting terminal has the signal that needs transmission at least one channel, send needing the signal of transmission to adopt orthogonal intersection to carry out merging behind the orthogonal spectrum expansion respectively in each channel, being divided into again in each described time-frequency piece.
In this external described method, also comprise following steps:
Described transmitting terminal adopts orthogonal intersection to carry out merging behind the orthogonal spectrum expansion signal that needs in pilot signal and other each channels to send, and is divided in each described time-frequency piece to send again.
In this external described method, also comprise following steps;
Described transmitting terminal carries out the channel error correction coding earlier before needing the signal of transmission to carry out described spread spectrum in described channel.
In this external described method, described channel error correction coding adopts " REED-MULLER " sign indicating number.
In this external described method, also comprise following steps:
Described transmitting terminal carries out scrambling to this signal earlier before will arriving each time-frequency piece through the division of signal of spread spectrum, the division of signal after scrambling is sent in each time-frequency piece again.
In this external described method, also comprise following steps:
Described signal after scrambling repeats to be carried at least two described time-frequency pieces and sends.
The present invention also provides the signal acceptance method in a kind of ofdm system, comprises following steps:
Receiving terminal is received signal in default time-frequency piece, and with corresponding spreading code the signal that is received is carried out despreading and carries out the signal that coherent demodulation obtains being transmitted with pilot tone; Wherein, the time formed by continuous sub-carriers and continuous symbol of described time-frequency piece and the two-dimensional block of frequency.
Wherein, also comprise following steps:
Described receiving terminal carries out coherent demodulation with the signal after despreading with pilot tone, carries out the channel error correction decoding again, obtains the signal that described transmitting terminal need send.
In this external described method, also comprise following steps:
Described receiving terminal carries out descrambling earlier to all signals that receive, and again the signal behind descrambling is carried out described despreading.
The present invention also provides a kind of sender unit of ofdm system, comprises:
Spread spectrum module is used for the signal that need send is carried out spread spectrum with spreading code;
Sending module is used for the division of signal behind described spread spectrum module spread spectrum is sent to each time-frequency piece, the time of being made up of continuous sub-carriers and continuous symbol of described time-frequency piece and the two-dimensional block of frequency.
Wherein, described spread spectrum module adopts orthogonal intersection that the signal and the pilot signal that need at least one channel to send are carried out spread spectrum; Described dispensing device also comprises the merging module, is used for each channel and pilot signal are outputed to described sending module after signal behind the described spread spectrum module spread spectrum and pilot signal merging.
In addition, also comprise channel error correction coding module, be used for the signal that each described channel need send is carried out outputing to described spread spectrum module after the channel error correction coding.
In addition, also comprise scrambling module, be used for outputing to described sending module behind the signal scrambling from described merging module.
The present invention also provides a kind of signal receiving device of ofdm system, comprises:
Receiver module is used in default time-frequency piece received signal, the time that described time-frequency piece is made up of continuous sub-carriers and continuous symbol and the two-dimensional block of frequency;
The despreading module, the signal that is used for described receiver module is received carries out exporting after the despreading with corresponding spreading code.
Wherein, also comprise
The coherent demodulation module is used to utilize the pilot signal of described despreading module output that other signal is carried out exporting after the coherent demodulation;
Channel error correction decoding module is used for the back output of decoding of the signal of described coherent demodulation module output.
In addition, also comprise descrambling module, the signal that is used for that described receiver module is received carries out outputing to described despreading module behind the descrambling.
By relatively finding that the main distinction of technical scheme of the present invention and prior art is that the signal that will send earlier at transmitting terminal carries out spread spectrum with spreading code, will in each time-frequency piece, send through the division of signal of spread spectrum again.Because the time that the time-frequency piece is made up of continuous sub-carriers and continuous symbol and the two-dimensional block of frequency, make each subcarrier in a time-frequency piece can aspect time decline property, keep relative stablizing in frequency decline property with each symbol, thereby can effectively resist intrinsic frequency selective fading of ofdm system and time selective fading, can improve the antijamming capability of signal by the spread spectrum of spreading code.
Transmitting terminal can send the signal of a plurality of channels simultaneously, earlier the signal that needs in each channel to send is carried out orthogonal spectrum expansion with orthogonal intersection, again in each channel after the signal of spread spectrum merges, be divided in each time-frequency piece and send.Receiving terminal is received this transmission signal in default time-frequency piece after, adopt corresponding inverse process to obtain signal in each channel.Comprised pilot signal in the signal that needs to send, receiving terminal adopts coherent demodulation, has improved the quality of reception.Because the signal that transmitting terminal sent has been avoided the intrinsic frequency selective fading of ofdm system, and intrinsic time selective fading in the mobile communication, thereby guaranteed the spread-spectrum signal quadrature still in each received channel of receiving terminal, and then effectively avoided phase mutual interference between the user, reached the better quality of reception.
The length of an interior transmission signals of time-frequency piece can be identical with a spreading code length, so that corresponding to the bit signal before the spread spectrum, make receiving terminal receive the signal that just can solve a bit behind the time-frequency piece, improved transmission performances for each channel.
Before the signal that need to send in each channel carried out spread spectrum, carry out the channel error correction coding earlier, further guaranteed transmission reliability.
Transmitting terminal is before sending signal, and the signal through spread spectrum in each channel that will merge earlier carries out scrambling, has reached to distinguish the different cellular cells or the purpose of sector.
The signal that transmitting terminal sent repeats to be carried in a plurality of time-frequency pieces and sends, to reach the effect of frequency diversity.
Description of drawings
Fig. 1 is the signal in a reverse control channel transmission schematic diagram in the ofdm system in the prior art;
Fig. 2 is the sending method flow chart according to signal in the ofdm system of first embodiment of the invention;
Fig. 3 is the sending method schematic diagram according to signal in the ofdm system of first embodiment of the invention;
Fig. 4 is the method for reseptance flow chart according to signal in the ofdm system of first embodiment of the invention;
Fig. 5 is according to the transmission of the ofdm system signal of second embodiment of the invention, receiving system structure chart.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is, transmitting terminal merges the signal that needs in each channel to send after with the orthogonal intersection spread spectrum, and the division of signal after will merging again is made up of in the time-frequency piece continuous sub-carriers and continuous symbol to each to be sent.The ofdm signal that transmits by the continuity assurance of each subcarrier in the time-frequency piece and each symbol is keeping relative stablizing aspect frequency decline property and the time decline property, thereby guaranteed the spread-spectrum signal quadrature still in each received channel of receiving terminal, and then effectively avoided phase mutual interference between the user, and improved the antijamming capability of signal by the spread spectrum of spreading code, reached the better quality of reception.
More than principle of the present invention has been done simple introduction, be described in detail according to the transmission and the method for reseptance of this principle below signal in the first execution mode ofdm system of the present invention.
The signaling method of present embodiment as shown in Figure 2, in step 210, the signal that transmitting terminal will be in each channel needs to send carries out the channel error correction coding, carries out the channel error correction coding as adopting " REED-MULLER " sign indicating number.
Specifically, as shown in Figure 3, when transmitting terminal has the signal that needs transmission in a plurality of channels, adopt " REED-MULLER " sign indicating number to carry out the channel error correction coding respectively the signal that needs in each channel to send.With channel 1 is example, if there are 10 bit signals to need to send in the channel 1, " sign indicating number carries out the channel error correction coding to these 10 bit signals, and encoder is exported 32 bits; similarly, channel 2 is adopted in a like fashion to channel N encoded then to adopt REED-MULLER.In this step, carry out the channel error correction coding, improved transmission reliability by the signal that need are sent.
Then, in step 220, transmitting terminal adopts orthogonal intersection to carry out merging behind the orthogonal spectrum expansion signal after encoded in each channel and pilot signal.
Specifically, as shown in Figure 3, channel 1 has all been exported the signal of 32 bits after encoded to channel N, and transmitting terminal adopts orthogonal intersection to carry out orthogonal spectrum expansion respectively these 32 bit signals in each channel, as adopts the WALSH orthogonal code of 16 bit long.Thereby different channels adopts different but orthogonal spreading codes to guarantee the phase mutual interference between the mutually orthogonal user of avoiding of each channel.And, improved the antijamming capability of signal by the spread spectrum of spreading code.Owing to adopted the WALSH orthogonal intersection of 16 bit long, so the signal behind spread spectrum is 32 * 16 in each channel, i.e. 512 bits, transmitting terminal merges the signal behind spread spectrum in each channel.Simultaneously, transmitting terminal also adopts the WALSH orthogonal code of 16 bit long to pilot signal, and the signal through spread spectrum in the pilot signal behind the spread spectrum and other each channels is merged, so that receiving terminal adopts coherent demodulation, has further improved the quality of reception.
Then, enter step 230, the signal after transmitting terminal is combined carries out scrambling.Specifically, as shown in Figure 3,512 bits after transmitting terminal is combined carry out scrambling, to distinguish different users, cellular cell or sector.
Then, enter step 240, transmitting terminal sends the division of signal after scrambling in each time-frequency piece, and wherein, the time-frequency piece is made up of continuous sub-carriers and continuous symbol, such as being made up of continuous 8 subcarriers and continuous 2 symbols.Because the time that the time-frequency piece is made up of continuous sub-carriers and continuous symbol and the two-dimensional block of frequency, therefore, each subcarrier in a time-frequency piece can keep relative stablizing in frequency decline property with each symbol aspect time decline property, thereby can effectively resist intrinsic frequency selective fading of ofdm system and time selective fading.In concrete the application, the size of time-frequency piece depends on the disturbed condition in the environment.The time-frequency piece must be sufficiently little, so that for most time-frequency pieces, inner each subcarrier and each symbol are basic identical on weak degree.If it is more violent that the interference in the environment changes on frequency, just should reduce the span of time-frequency piece on subcarrier, more violent if the interference in the environment changes in time, just should reduce the span of time-frequency piece on symbol.In general, less time-frequency piece is having preferable performance aspect opposing frequency selective fading and the time selective fading, and certainly, less time-frequency piece can only carry less amount of information.
Specifically, as shown in Figure 3, transmitting terminal is divided into the experimental process piece with 512 bit signals after scrambling, the size of each sub-piece correspondence is identical with the length of a spreading code, that is to say, 512 bit signals after scrambling are divided into 32 sub-pieces in chronological order, make each sub-piece contain 16 bits, corresponding WALSH code length, the bit signal before promptly making a sub-piece corresponding to a spread spectrum.Each sub-piece sends by a described time-frequency piece respectively, so that receiving terminal is received the signal that just can solve a bit behind the time-frequency piece for each channel, has improved transmission performances.That is to say that if time-frequency piece is made up of continuous 8 subcarriers and continuous 2 symbols, so, 32 sub-pieces will be sent by 32 time-frequency pieces, account for 64 subcarriers and 8 symbols altogether.
Need to prove that in the present embodiment, transmitting terminal will the signal after scrambling repeats to be carried at least two time-frequency pieces and sends, to reach the effect of frequency diversity.That is to say that transmitting terminal repeats these same 32 sub-pieces to be carried on other 32 time-frequency pieces, to reach the effect of frequency diversity.
The signal acceptance method of present embodiment as shown in Figure 4, in step 410, receiving terminal is received signal in default time-frequency piece.At above-mentioned case, receiving terminal is received signal in carrying the time-frequency piece of these 512 bit signals.
Then, enter step 420, receiving terminal carries out descrambling to received signal, distinguishes different users, cellular cell or sector.
Then, enter step 430, receiving terminal carries out despreading with the signal of corresponding spreading code after to descrambling, and obtains the signal of channel error correction coding in each channel by coherent demodulation.At above-mentioned case, receiving terminal carries out despreading with the WALSH sign indicating number of corresponding 16 bit long 512 bit signals after to descrambling, and is obtaining 32 bit signals of channel 1 to the channel error correction coding of channel N after the coherent demodulation respectively.
Then, enter step 440, the signal that receiving terminal is exported after to despreading carries out the channel error correction decoding.At above-mentioned case, receiving terminal carries out the channel error correction decoding to the channel after despreading and the coherent demodulation 1 to 32 bit signals of channel N respectively, obtains transmitting terminal and need the signal that sends in each channel.
The transmission of the second execution mode ofdm system signal of the present invention, receiving system are as shown in Figure 5.
In the dispensing device of ofdm system signal, comprise and be used for needing the signal of transmission to carry out the channel error correction coding module of channel error correction coding each channel, be used for adopting orthogonal intersection to carry out the spread spectrum module of spread spectrum to the signal behind each channel channel correction module coding, be used for signal and the pilot signal merging module that merge of each channel behind the spread spectrum module spread spectrum, be used for the scrambling module that carries out scrambling to from the signal that merges module, and be used for sending module that the division of signal after the scrambling module scrambling is sent to each time-frequency piece.Wherein, the time that the time-frequency piece is made up of continuous sub-carriers and continuous symbol and the two-dimensional block of frequency, make each subcarrier in a time-frequency piece can aspect time decline property, keep relative stablizing in frequency decline property, thereby can effectively resist intrinsic frequency selective fading of ofdm system and time selective fading with each symbol.And, can improve the antijamming capability of signal by the spread spectrum of spreading code.
The signal that in the receiving system of ofdm system signal, comprise the receiver module that is used in default time-frequency piece received signal, is used for that receiver module is received carry out descrambling descrambling module, be used for to the signal behind the descrambling module descrambling with corresponding spreading code carry out despreading the despreading module, be used for the signal of despreading is carried out the demodulation module of coherent demodulation, be used for the signal through the output of despreading module is carried out the channel error correction decoding module exported behind the channel error correction decoding.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (18)
1. the signaling method in the ofdm system is characterized in that, comprises following steps:
The signal that transmitting terminal will send carries out spread spectrum with spreading code, and will send in each time-frequency piece through the division of signal of spread spectrum, the time that described time-frequency piece is made up of continuous sub-carriers and continuous symbol and the two-dimensional block of frequency.
2. the signaling method in the ofdm system according to claim 1 is characterized in that, also comprises following steps:
Described transmitting terminal will become sub-piece through the division of signal of spread spectrum, and the length of the short spreading code of the size of each sub-piece correspondence and use is identical, and each sub-piece sends by a described time-frequency piece respectively.
3. the signaling method in the ofdm system according to claim 1, it is characterized in that, when described transmitting terminal has the signal that needs transmission at least one channel, send needing the signal of transmission to adopt orthogonal intersection to carry out merging behind the orthogonal spectrum expansion respectively in each channel, being divided into again in each described time-frequency piece.
4. the signaling method in the ofdm system according to claim 3 is characterized in that, also comprises following steps:
Described transmitting terminal adopts orthogonal intersection to carry out merging behind the orthogonal spectrum expansion signal that needs in pilot signal and other each channels to send, and is divided in each described time-frequency piece to send again.
5. according to the signaling method in each described ofdm system in the claim 1 to 4, it is characterized in that, also comprise following steps;
Described transmitting terminal carries out the channel error correction coding earlier before needing the signal of transmission to carry out described spread spectrum in described channel.
6. the signaling method in the ofdm system according to claim 5 is characterized in that, described channel error correction coding adopts " REED-MULLER " sign indicating number.
7. the signaling method in the ofdm system according to claim 5 is characterized in that, also comprises following steps:
Described transmitting terminal carries out scrambling to this signal earlier before will arriving each time-frequency piece through the division of signal of spread spectrum, the division of signal after scrambling is sent in each time-frequency piece again.
8. the signaling method in the ofdm system according to claim 7 is characterized in that, also comprises following steps:
Described signal after scrambling repeats to be carried at least two described time-frequency pieces and sends.
9. the signal acceptance method in the ofdm system is characterized in that, comprises following steps:
Receiving terminal is received signal in default time-frequency piece, and with corresponding spreading code the signal that is received is carried out despreading and carries out the signal that coherent demodulation obtains being transmitted with pilot tone; Wherein, the time formed by continuous sub-carriers and continuous symbol of described time-frequency piece and the two-dimensional block of frequency.
10. the signal acceptance method in the ofdm system according to claim 9 is characterized in that, also comprises following steps:
Described receiving terminal carries out coherent demodulation with the signal after despreading with pilot tone, carries out the channel error correction decoding again, obtains the signal that described transmitting terminal need send.
11. the signal acceptance method according in claim 9 or the 10 described ofdm systems is characterized in that, also comprises following steps:
Described receiving terminal carries out descrambling earlier to all signals that receive, and again the signal behind descrambling is carried out described despreading.
12. the sender unit of an ofdm system is characterized in that, comprises:
Spread spectrum module is used for the signal that need send is carried out spread spectrum with spreading code;
Sending module is used for the division of signal behind described spread spectrum module spread spectrum is sent to each time-frequency piece, the time of being made up of continuous sub-carriers and continuous symbol of described time-frequency piece and the two-dimensional block of frequency.
13. the sender unit of ofdm system according to claim 12 is characterized in that, described spread spectrum module adopts orthogonal intersection that the signal and the pilot signal that need at least one channel to send are carried out spread spectrum; Described dispensing device also comprises the merging module, is used for each channel and pilot signal are outputed to described sending module after signal behind the described spread spectrum module spread spectrum and pilot signal merging.
14. the sender unit of ofdm system according to claim 13 is characterized in that, also comprises channel error correction coding module, is used for the signal that each described channel need send is carried out outputing to described spread spectrum module after the channel error correction coding.
15. the sender unit according to each described ofdm system in the claim 12 to 14 is characterized in that, also comprises scrambling module, is used for outputing to described sending module behind the signal scrambling from described merging module.
16. the signal receiving device of an ofdm system is characterized in that, comprises:
Receiver module is used in default time-frequency piece received signal, the time that described time-frequency piece is made up of continuous sub-carriers and continuous symbol and the two-dimensional block of frequency;
The despreading module, the signal that is used for described receiver module is received carries out exporting after the despreading with corresponding spreading code.
17. the signal receiving device of ofdm system according to claim 16 is characterized in that, also comprises
The coherent demodulation module is used to utilize the pilot signal of described despreading module output that other signal is carried out exporting after the coherent demodulation;
Channel error correction decoding module is used for the back output of decoding of the signal of described coherent demodulation module output.
18. the signal receiving device according to claim 16 or 17 described ofdm systems is characterized in that, also comprises descrambling module, the signal that is used for that described receiver module is received carries out outputing to described despreading module behind the descrambling.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100797885A CN101060515A (en) | 2006-05-15 | 2006-05-15 | OFDM system signal receiving and sending method and its device |
| PCT/CN2007/001569 WO2007137489A1 (en) | 2006-05-15 | 2007-05-15 | Signal receiving and transmitting method in the Orthogonal Frequency Division Multiplexing system and apparatus thereof |
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| CNA2006100797885A CN101060515A (en) | 2006-05-15 | 2006-05-15 | OFDM system signal receiving and sending method and its device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102299728A (en) * | 2011-08-24 | 2011-12-28 | 北京福星晓程电子科技股份有限公司 | Power line carrier communication sending method based on time frequency coding and device |
| CN102340474A (en) * | 2009-12-31 | 2012-02-01 | 英特尔公司 | OFDM transmitter and methods for reducing the effects of severe interference with symbol loading |
| CN102547997A (en) * | 2010-12-15 | 2012-07-04 | 上海贝尔股份有限公司 | Method and equipment for carrying out adaptive scheduling in wireless communication system based on interference |
| CN107148802A (en) * | 2014-11-06 | 2017-09-08 | 华为技术有限公司 | The system and method that the transmission symbol interfered for reducing is arranged |
| WO2019174006A1 (en) * | 2018-03-15 | 2019-09-19 | 华为技术有限公司 | Data transmission method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1434588A (en) * | 2003-03-07 | 2003-08-06 | 北京邮电大学 | Time-frequency union spreading method based on OFDM-CDMA for broadband radio communication system |
| JP2004363721A (en) * | 2003-06-02 | 2004-12-24 | Matsushita Electric Ind Co Ltd | Wireless communication system and wireless communication method |
| KR100643740B1 (en) * | 2004-04-09 | 2006-11-10 | 삼성전자주식회사 | Apparatus and method for pilot code pattern transmission / reception for base station classification in communication system using orthogonal frequency division multiplexing |
| CN100483977C (en) * | 2004-10-29 | 2009-04-29 | 清华大学 | Time-frequency matrix two-dimensional channel dynamic allocation method in multimedia information transmission |
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| WO2019174006A1 (en) * | 2018-03-15 | 2019-09-19 | 华为技术有限公司 | Data transmission method and device |
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