WO2008011834A1 - Procédé d'émission et de réception, dispositif fondé sur ofdm - Google Patents

Procédé d'émission et de réception, dispositif fondé sur ofdm Download PDF

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Publication number
WO2008011834A1
WO2008011834A1 PCT/CN2007/070325 CN2007070325W WO2008011834A1 WO 2008011834 A1 WO2008011834 A1 WO 2008011834A1 CN 2007070325 W CN2007070325 W CN 2007070325W WO 2008011834 A1 WO2008011834 A1 WO 2008011834A1
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Prior art keywords
signal
module
channel
signals
orthogonal
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Application number
PCT/CN2007/070325
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English (en)
Chinese (zh)
Inventor
Bin Li
Meng Zhao
Lixia Xue
Yi Luo
Yinggang Du
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008011834A1 publication Critical patent/WO2008011834A1/fr

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Classifications

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

Definitions

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

Abstract

L'invention concerne un procédé d'émission de signaux fondé sur OFDM, qui consiste notamment: à diviser un signal en au moins deux parties; à mapper chaque partie du signal en code orthogonal; à effectuer une pré-disposition au code orthogonal, puis l'émettre. De plus, un procédé de réception de signaux fondé sur l'OFDM consiste notamment: à effectuer une pré-disposition au signal reçu et récupérer des signaux de canal comportant un code orthogonal; à diviser ces signaux de canal en plusieurs parties selon la règle de mappage utilisée lorsque le signal est émis; à effectuer une disposition correspondante et un décodage de code de correction d'erreur à ces parties en combinaison. Parallèlement, l'invention concerne un dispositif d'émission et de réception fondé sur l'OFDM. Le système d'émission et de réception fondé sur l'OFDM selon l'invention acquiert une plus forte capacité d'antibrouillage en améliorant l'orthogonalité au niveau du signal d'étalement reçu
PCT/CN2007/070325 2006-07-19 2007-07-19 Procédé d'émission et de réception, dispositif fondé sur ofdm WO2008011834A1 (fr)

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