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Receiving method and device for multi-user orthogonal frequency division multiple access based on space-time reference

A technology of orthogonal frequency division multiple access and receiving method, applied in the field of multi-user communication, can solve the problems of carrier frequency deviation and poor communication effect, and achieve the effect of improving communication quality

Active Publication Date: 2020-06-12
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a multi-user Orthogonal Frequency Division Multiple Access receiving method and device based on a space-time reference, which alleviates the technical problem of relatively poor communication effect caused by carrier frequency deviation when OFDMA technology is used for communication.

Method used

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  • Receiving method and device for multi-user orthogonal frequency division multiple access based on space-time reference
  • Receiving method and device for multi-user orthogonal frequency division multiple access based on space-time reference
  • Receiving method and device for multi-user orthogonal frequency division multiple access based on space-time reference

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0100] Example 1, combined with figure 2 As shown, taking four transmitting users A, B, C, and D as an example, M=4, pilot length N p 128 points, the number of subcarriers N c 32, data frame length N f It is 1024 points. Using scheme 1 for OFDMA reception, the steps are as follows:

[0101] Step S11, configure initialization parameters: number of users M=4, pilot length N p =128, the number of subcarriers N c =32, data frame length N f = 1024, assuming that the subcarriers are evenly allocated to each user, the number of subcarriers occupied by each user Pilot required OFDM symbols, the data frame requires OFDM symbols.

[0102] Step S12, carry out parallel correlation accumulation operation on the local code sequence and the pilot data set, and judge whether the parallel correlation accumulation operation result is greater than the threshold value: first cache an OFDM symbol received, and perform 32-point FFT (Fast Fourier Interval) on it Lie transform) to get 3...

example 2

[0106] Example 2, combined with image 3 As shown, there are four transmitting users A, B, C, and D, the pilot length is 128 points, the number of subcarriers is 32, and the data frame length is 1024 points. Using scheme two for OFDMA reception, the steps are as follows:

[0107] Step S21, configure initialization parameters: number of users M=4, pilot length N p =128, the number of subcarriers N c =32, data frame length N f = 1024, assuming that the subcarriers are evenly allocated to each user, the number of subcarriers occupied by each user Pilot required OFDM symbols, the data frame requires OFDM symbols.

[0108] Step S22, perform serial correlation accumulation operation on the local code sequence and the pilot data set, and judge whether the serial correlation accumulation operation result is greater than the threshold value: perform 32-point FFT (fast Fourier transform) on the received symbol, The FFT data of a frame header is buffered therefrom, that is, the...

example 3

[0112] Example 3, combining Figure 4 As shown, there are four transmitting users A, B, C, and D, the pilot length is 128 points, the number of subcarriers is 32, and the data frame length is 1024 points. Using scheme three for OFDMA reception, the steps are as follows:

[0113] Step S31, configure initialization parameters: number of users M=4, pilot length N p =128, the number of subcarriers N c =32, data frame length N f = 1024, assuming that the subcarriers are evenly allocated to each user, the number of subcarriers occupied by each user Pilot required OFDM symbols, the data frame requires OFDM symbols.

[0114] Step S32, carry out the serial correlation accumulation operation to the local code sequence and the pilot data set, and judge whether the serial correlation accumulation operation result is greater than the threshold value: carry out 32-point FFT (fast Fourier transform) to the received symbol, The FFT data of one frame is buffered therefrom, that is, t...

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Abstract

The invention provides a multi-user orthogonal frequency division multiple access receiving method and device based on space-time reference, and relates to the technical field of multi-users. The method comprises: obtaining a pilot data set of a time slot; performing correlation accumulation operation on the local code sequence and the pilot frequency data set; judging whether a correlation accumulation operation result is greater than a threshold value or not; if so, determining that a user transmission signal exists in the time slot; calculating an initial frequency offset value and an initial phase of the pilot frequency data set; obtaining an initial frequency offset value and an initial phase; tracking the data frame data set of the time slot by adopting a tracking ring; decoding thetracked data frame data set; obtaining user transmission signals. Whether the signals are stored in the user transmission signals or not is judged in a correlation accumulation mode, and the initial frequency deviation and the initial phase are calculated, the follow-up data frame is tracked and corrected by adopting the tracking ring, the technical problem of poor communication effect caused by the carrier frequency deviation when the OFDMA technology is adopted for communication is solved, and the communication quality is improved.

Description

technical field [0001] The present invention relates to the technical field of multi-user communication, in particular to a multi-user Orthogonal Frequency Division Multiple Access receiving method and device based on a space-time reference. Background technique [0002] At present, multi-user communication can use multiple access technology, and the realization principle can be to establish a communication link between the base station and multiple users in the radio broadcast channel. With the development of OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology, people combine OFDM technology and multiple access technology to form OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access) Injection technology) technology, OFDMA requires each user to occupy one or more subcarriers. OFDMA divides the entire frequency band into smaller units, multiple users can use the entire frequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2657H04L2027/0026
Inventor 倪祖耀林志远梁煜王璞瑞晏坚靳瑾匡麟玲
Owner TSINGHUA UNIV