Method for encoding and decoding asynchronous space-time code for collaborative multi-point transmission

Abstract

The invention discloses a method for encoding and decoding an asynchronous space-time code for collaborative multi-point transmission, to solve the problem that the collaborative communication can not be carried out due to time asynchronization and frequency offset during collaborative multi-point joint processing. The method comprises the following specific steps that: (1) user equipment estimates the channel parameter and feeds back the channel parameter to remote wireless equipment; (2) different remote wireless equipment constructs delay convolutional encoding matrixes; (3) the user equipment estimates the overall equivalent channel matrix of the remote wireless equipment; (4) the user equipment constructs the frequency offset matrix; (5) an eNodeB evolutional base station transmits the symbol sequence; (6) the remote wireless equipment carries out space-time coding on the information sequence and sends the information sequence; (7) the user equipment carries out frequency compensation on the received symbol sequence; and (8) the user equipment judges the feedback decoding by using the minimum mean square error and decodes. Due to the adoption of the method, the full-mark set gain can be obtained without carrying out accurate time and frequency synchronization, and the decoding complexity is reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to an asynchronous space-time code technology, in particular to an asynchronous space-time code encoding and decoding method for a coordinated multi-point transmission system, which can be used in a distributed coordinated multi-point transmission system for wireless communication in the future. Background technique [0002] In a multi-cell cellular system, the spectrum efficiency of the communication system can be improved by using MIMO technology. However, due to the existence of co-channel interference, the throughput of edge cells cannot be effectively improved. In order to solve this problem, on the basis of MIMO technology Coordinated multipoint CoMP transmission technology is proposed. In CoMP, remote wireless devices in multiple cells cooperate with each other and can communicate with users in edge cells at the same time, which not only improves system reliability, but also ...

AI Technical Summary

Problems solved by technology

[0003] The coordinated multi-point joint processing CoMP-JP mode can be applied to a single or multiple user equipment UEs under the given time domain and frequency domain resources. In the scenario of multiple remote wireless devices and multi-user equipment, different remote The time and frequency synchronization between the terminal wireless equipment and the user equipment cannot be solved by conventional methods at the same time. The research shows that with the increase of the number of UEs and RREs, the possibility of the system to complete accurate time and frequency synchronization decreases, and even the possibility tends to increase. at zero

Existing space-time processing and codec technologies cannot be applied to scenarios where time and frequency are not precisely synchronized. Therefore, for CoMP-JP mode, it is necessary to study space-time processing with a certain tolerance for time and frequency imprecise synchronization. Processing and Codec Technology

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