Symbol level network encoding method for wireless relaying system

Abstract

The invention discloses a symbol level network encoding method for a wireless relaying system based on a modulation constellation diagram rotation. A rotation angle set of network encoding symbols is determined according to state information of a wireless channel, so that a symbol superposition coefficient of two paired user signals for network encoding is determined; by precognition of the superposition coefficient, a base station performs detection according to the received network encoding information and information directly transmitted by a user, so that information of two users can be correctly recovered, and a relatively high transmission diversity gain can be obtained. According to the symbol level network encoding method, on the basis of reducing the transmission performance drop caused by introduction of wireless relaying, the reliability of uplink transmission is promoted effectively; the method is suitable for multi-address access relaying scenes for Type I or non-transparent relaying as well as bidirectional relaying and multicast relaying scenes; and furthermore, the conventional wireless air interface protocol is compatible, and the conventional communication protocol of a terminal is not modified, so that the method has an extremely good popularization and application prospect.

Description

technical field [0001] The invention relates to a wireless cellular mobile communication method using relay transmission, in particular to a symbol-level network coding method using modulation constellation diagram rotation, and belongs to the technical fields of broadband wireless communication and wireless relay transmission. Background technique [0002] The future mobile communication system will be committed to realizing ubiquitous communication between anyone or anything at any time, any place, providing high-speed data services to as many users as possible within the coverage of the entire network, and reducing user transmission costs. Latency, which poses a huge challenge to existing communication technologies and network architectures. Therefore, it is necessary to introduce new advanced communication technologies on the basis of the existing network architecture and communication solutions to further increase the transmission rate of the wireless communication syst...

AI Technical Summary

Problems solved by technology

For the network coding transmission scheme of the wireless relay system, there are currently some research results in the industry, but almost all the research results have not considered how to combine the characteristics of the current Type I relay system, that is, in the actual system protocol, the relay needs to Recover the received information first, instead of simply forwarding it directly

At the same time, the serving base station needs to combine the direct transmission information and the mixed information processed by network coding to recover the target signal. This will increase the complexity of the receiving end, and at the same time, due to factors such as multi-path transmission and synchronization, the bit error rate of transmission will be increased.

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