Double-repeat signal transmission method based on interference cancellation

Abstract

The invention provides a dual-relay signal transmission method based on interference elimination, which is applied to a two-bounce dual-relay communication system. A first signal to be transmitted is sent to all node terminals by a source node terminal in a first transmission interval, and all relay node terminals respectively generate a first relay signal after detecting the first signal to be transmitted; then a second signal to be transmitted is sent to a second relay node terminal by the source node terminal in a second transmission interval, and simultaneously, the generated first relay signal is sent to all the node terminals by a first relay node terminal; after detecting the first relay signal, an objective node terminal restores the corresponding first signal to be transmitted, and simultaneously, after detecting signals sent from the source node terminal and the first relay node terminal, the second relay node terminal adopts the method of interference elimination to generate a second relay signal from the detected signal and send the second relay signal to the objective node terminal in a third transmission interval; after detecting the second relay signal, the objective node terminal restores the corresponding second signal to be transmitted. Therefore, two signals can be transmitted in three intervals, and the transmission efficiency is improved.

Description

technical field [0001] The invention relates to a dual-relay signal transmission method based on interference cancellation. Background technique [0002] Since the operating frequency spectrum of the next generation mobile communication is above 2 GHz, the system is more sensitive to the non-line-of-sight large-scale attenuation. In order to make up for the shortcomings of working in high frequency bands, more base stations (BS) need to be expanded to ensure a higher transmission rate than the existing communication system, but this will lead to an increase in BS density and a significant increase in industrial costs. In order to solve these problems, in recent years, academia and industry have proposed the concept of cooperative diversity, which uses the relay node (Relay Node, RN) between the source node (SourceNode, SN) and the destination node (Destination Node, DN) to help SN sends data reliably to DN. For details, please refer to the literature: "J.N.Laneman, D.N.C.Ts...

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Problems solved by technology

However, the scheme proposed in the previous literature requires additional frequency domain resources or orthogonal code domain resources. Strictly speaking, it is not a real full-rate transmission

The solution in the latter document accumulates the interference at the RN and DN terminals one by one. After the data packet transmission is completed, the DN eliminates the interference at one time and completes the decoding in a recursive way. Under high SNR, if the data packet length is sufficient Long, this scheme can realize real full-rate transmission, but its disadvantages are: 1. The algorithm is too complicated and requires a large buffer (Buffer) at the DN end to store a large data packet content. If you consider the cellular system Downlink, the general mobile terminal system cannot achieve such complex processing requirements; 2. Only when the SN sends the entire data packet, the DN can use the interference elimination algorithm to obtain the original data packet information, so this method can only be applied to data delay 3. The channel conditions between each point need to be reported to the DN, which is not a small overhead for the system; 4. When the channel quality is not high, if the data packet If it is too long, the accumulation of errors will cause a significant decrease in system performance

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