A multi-cell channel estimation method in td-scdma system

Abstract

The invention provides a multi-cell channel estimation method for a time division-synchronous code division multiple access (TD-SCDMA) system. The method specifically comprises the following steps of: performing rough channel estimation on each cell by adopting single-cell Steiner channel estimation; determining the total number of access users according to a rough channel estimation result; judging whether the total number of the access users meets multi-cell joint channel estimation conditions, performing multi-cell joint channel estimation on the access users of each cell of the total number of the access users meets the multi-cell joint channel estimation, otherwise performing multi-cell serial interference cancellation channel estimation on the access users of each cell; and performing de-noising processing on a multi-cell joint channel estimation result or a multi-cell serial interference cancellation channel estimation result. By the method, operational complexity can be greatly reduced and the needs of the access users in any number can be satisfied under the condition of ensuring high channel estimation accuracy, thereby better solving the problem of severe inter-channel interference of the TD-SCDMA system on cell edges and providing quality assurance for multi-cell joint detection.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a multi-cell channel estimation method in a TD-SCDMA system. Background technique [0002] TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) system was proposed by CWTS (China Wireless Telecommunications Standards group) and accepted by ITU (International Telecommunications Union) One of the third generation mobile communication standards. Among them, joint detection is one of the key technologies applied in TD-SCDMA system, and the performance of this technology depends on fast and accurate channel estimation. [0003] The TD-SCDMA system can be networked with different frequencies or with the same frequency. Among them, the advantage of the same frequency network is that all cells may use all possible frequency resources and have a high spectrum utilization rate. However, its An unavoidable problem is brought about, that is, user signals of adjac...

AI Technical Summary

Problems solved by technology

[0006] First, the computational complexity is high; the huge amount of computation restricts the speed of channel estimation, which leads to a significant reduction in the idle time of joint detection;

[0007] Second, the conditions are harsh; similar to traditional single-cell Steiner channel estimation, multi-cell joint channel estimation has a limit on the maximum number of access users that can be satisfied. For the uplink, this limit is easily exceeded. The access users in the range will be treated as white noise, which will greatly reduce the channel estimation accuracy

[0008] In short, a technical problem that needs to be urgently solved by those skilled in the art is: how to solve the problem that low-rate users are seriously interfered by high-rate users in a multi-rate TD-SCDMA system with relatively low computational complexity

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