Construction method of spreading codes and multi-community joint detection method

Abstract

The invention discloses a construction method of spreading codes for users in the adjacent community under multiframe structure and a multi-community joint detection method based on the construction method. As users in adjacent communities use code channels with the same time division multiplex (TDM), large exchange space is needed when a radio network controller and the node B in the current community exchange all the multiplex code channel information, and the computation difficulty is high, therefore, the invention provides that so long as plural users in the current adjacent community usethe same code channel by TDM and the spreading factors of the plural users are different, the radio network controller only exchanges information of spreading codes of small spreading factors with the node B; and that spreading codes of small spreading factors can be utilized to structure spreading codes of large spreading factors, thus simplifying structure of spreading codes, lowering complexity, achieving multi-community joint detection, simplifying utilization and reducing complexity.

Description

technical field [0001] The invention relates to the field of third-generation mobile communication, in particular to a method for constructing a spreading code and a multi-cell joint detection method under the configuration of an uplink multiframe structure in TD-CDMA and TD-SCDMA mobile communication. Background technique [0002] At present, most of the third-generation mobile communication systems adopt code division multiple access technology. The transmitting end uses the orthogonal spreading code to spread the signal and sends it out, and the receiving end uses the known spreading code sequence to detect the transmitted signal, such as figure 1 shown. In the current TD-SCDMA system, the spreading code adopts OVSF code, such as image 3 shown. The generation process of the spreading code is: a branch in the same code tree is generated by the branch of the previous node, for example, the first-level code tree Generate the second level code tree Second level code tr...

AI Technical Summary

Problems solved by technology

[0009] The technical problem solved by the present invention is that in the prior art, when the user time-division multiplexes the same code channel, the radio network controller and the Node B of the cell need a large data interaction space for exchanging all the multiplexed code channel information, and the calculation of the matrix T is complicated Therefore, a construction method of spreading codes and a multi-cell joint detection method are proposed

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