Two-way relay communication system signal sending and receiving method
A communication system and two-way relay technology, applied in the field of communication, can solve problems such as difficult channel estimation, and achieve the effect of improving detection performance
Active Publication Date: 2020-05-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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The detection of signals in traditional two-way relay communication systems is very dependent on the accuracy of the estimated channel, but due to the complexity of channels experienced by two-way relay communication systems, channel estimation is particularly difficult
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[0042] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0043] figure 1 The system model of the present invention is shown. The relay station simultaneously receives signals from base station 1 and base station 2, amplifies them, and sends them to base station 1 and base station 2 respectively. For the two-way relay communication system, the signal received by the relay station is:
[0044] x=h 1 the s 1 + h 2 the s 2 + u
[0045] Among them, s 1 is the signal vector composed of symbols sent by base station 1, s 2 is a signal vector composed of symbols sent by base station 2, with a total of N lines, indicating that there are N symbols to send, h 1 Indicates the channel response from base station 1 to relay station, h 2 Indicates the channel response from base station 2 to relay station, u refers to the noise, where u(n) obeys the mean value is 0 and the variance is σ 2 The cyclic symm...
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The invention belongs to the technical field of communication and particularly relates to a two-way relay communication system signal sending and receiving method. The conventional two-way relay communication system signal detection needs channel estimation, after estimation of channel information h1 and h2, interference offset is carried out on a receiving signal to eliminate the influence of the own signal and then the coherent detection is carried out to restore a sending signal. Owing to the complexity of the system, the channel estimation is very difficult, and the conventional signal detection mode is very dependent on the accuracy of the channel estimation. The two-way relay communication system signal sending and receiving method is different from the conventional two-way relay communication system signal detection scheme, the method does not need the channel estimation and can directly process the receiving signal and carry out clustering and indicate the class of symbols after clustering through a mark symbol sent by the sending end, so that the sending symbol is restored. Compare with the conventional technology, the method can greatly improve the detection performance of a receiver and does not need the channel estimation at the receiving end.
Description
technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a signal sending and receiving method of a two-way relay communication system. Background technique [0002] The two-way relay communication system can overcome the shadow fading caused by large-scale obstacles, and has been widely used in wireless communication. The signal detection of the traditional two-way relay communication system requires channel estimation first, then uses the estimated channel to perform interference cancellation, and finally uses the estimated channel to perform coherent detection (Coherent Detection) to recover the transmitted symbols. The detection of signals in traditional two-way relay communication systems is very dependent on the accuracy of the estimated channel, but due to the complexity of the channels experienced by two-way relay communication systems, channel estimation is particularly difficult. Contents of the invention ...
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IPC IPC(8): H04L27/20H04L27/22H04B7/155
CPCH04B7/15507H04L27/20H04L27/22
Inventor 梁应敞张倩倩黄雨迪
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA