Method for forwarding multi-system soft information in Rayleigh channel

Abstract

The invention discloses a method for forwarding multi-system soft information in a Rayleigh channel. When high order modulation is adopted, under a low SNR (Signal Noise Ratio) region, an MPSK (Multiple Phase Shift Keying) signal estimation forwarding method in a fading channel is selected; and under a high SNR region, an MPSK signal mutual information forwarding method in the fading channel is selected. The method for forwarding the multi-system soft information in the Rayleigh channel has the beneficial effects that the system bit error rate performance is better; and under the condition that the SNR is the same as relay number, the data rate is gradually increased along with the increase of system number, and the reliability of each scheme is obviously reduced, but the bit error rate performance of a soft information forwarding scheme is still superior to an AF scheme and a DF scheme.

Description

technical field [0001] The invention belongs to the technical field of cooperative communication, and in particular relates to a method for forwarding multi-ary soft information in a Rayleigh channel. Background technique [0002] Wireless communication will produce multipath fading in the process of using radio waves for information transmission, and the fading characteristics of wireless channels are one of the main reasons that hinder the increase of channel capacity and the improvement of service quality. Space diversity technology can effectively suppress multipath fading. As a space diversity technology, cooperative diversity technology can obtain space diversity degree by sharing antennas of adjacent users, so it can significantly improve system performance. [0003] Cooperative communication and networking is an emerging research field with great potential and application prospects. In recent years, with the in-depth study of cooperative diversity technology, the me...

AI Technical Summary

Problems solved by technology

[0019] Chinese patent (application number: 200710136098, patent name: variable rate soft information forwarding scheme), this scheme is based on estimated forwarding, that is, the estimated value of the forwarded symbol at the relay, which relies heavily on the power constraint at the relay, Compression and forwarding are easy to cause information loss and misdecoding

[0020] Chinese patent (patent number: 201210161488, patent name: a method of information transmission in a wireless relay system), this method only involves the EF forwarding scheme based on BPSK modulation, the transmission rate is not high, and it is not suitable for certain requirements on the transmission rate The required environment, and the system model is different

[0021] Chinese patent (patent number: 200910247316, patent name: a relay demodulation and forwarding system and method for overcoming signal distortion), the invention only involves the Gaussian channel, and does not give the solution under the Rayleigh channel, which is not applicable to the real environment

In addition, under the condition of high signal-to-noise ratio, the reliability of the estimated forwarding scheme is not optimal

Images