An Incremental Relay Transmission Method Based on Multiple Input Multiple Output Cooperative Network

Abstract

The invention discloses an incremental relay transmission method based on an MIMO (multiple-input multiple-output) collaboration network. A transmission process is divided into two timeslots, and the method comprises the following steps that: 1, in the first timeslot, an information source S broadcasts a signal sequence, an information destination D and a relay R receive the signal sequence; 2, after receiving signals, the D calculates the SNR (signal to noise ratio) of a received symbol on each antenna, and compares one of the SNRs with a preset threshold value, if the output SNRs on the antenna are all greater than the threshold value, the D determines that the signal transmission is successful, otherwise, the D determines that the signal transmission fails; 3, the D feeds back single-bit information B to the S and the R, if B = 1, the R does not forward signals in the second timeslot, if B = 0, the R amplifies and forwards signals (received by the R in the first timeslot) in the second timeslot, and the S does not send any signal; and 4, after the two timeslots are ended, the D mergers two signals by using a MRC (maximum ratio combining) technology, and then carries out decoding on the signals. Due to the adoption of the method disclosed by the invention, while a higher diversity gain is achieved, the spectrum utilization rate is improved, therefore, the system resources are utilized more fully.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an incremental relay transmission method based on a multiple-input multiple-output (MIMO) cooperative network. Background technique [0002] Since J.N. Laneman et al. proposed in 2004, cooperative diversity technology has attracted extensive attention. By applying cooperative techniques, additional diversity gain can be obtained while also reducing radio frequency (RF) power requirements. However, in a cooperative network, due to half-duplex communication and the limitation that channels in different time slots must be orthogonal, the two benefits mentioned above are at the expense of spectral efficiency. [0003] In order to solve this shortcoming, three technologies have been proposed to enhance the spectral efficiency of cooperative networks, namely: beamforming, space-time coding, and incremental relaying. In beamforming, it is assumed that the source and the relay alr...

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