Research On The Detection Algorithm In Multi-Antenna Systems

TD-SCDMA is one of the four International standards of the Third Generation Mobile Communication (3G). As a code division multiplexing system, TD-SCDMA distinguishes the cellulars and UEs by the complex codes generated by the speading codes and scrambling codes. Because the spreading codes and scrambling codes in TD-SCDMA are shorter and less than WCDMA, there is more likely to cause coincident codes of the complex codes generated by the speading codes and scrambling codes. In this situation, the system cannot distinguish the UEs. Even though there is no coincident code, the system is still hard to distinguish the UEs when the complex codes are very similar.To avoid the appearance of the coincident codes and the complex codes which are too similar, code planning is required in the TD-SCDMA. Compared with the 512 codes in the WCDMA, the code resource in the TD-SCDMA is less, so the code planning is much more important, the research of the correlation of the different codes is essential.Compared with WCDMA, the research of TD-SCDMA is slow and the network planning technique is immature. The study of the code planning in TD-SCDMA is rare while this research is very important because of the short and few codes in the TD-SCDMA. Therefore, this research is necessary before the large-scale application of TD-SCDMA.In this article, some basal cotents, scrambling codes, spreading codes and complex codes generated by scrambling codes and spreading codes in TD-SCDMA are introduced at first. Than the 128 scrambiling codes is grouped by the possibility of the coincident codes generated by the scrambling codes, so that the interference can be weighed.The interference of a pair of complex codes is be expounded base on the correlation between the code sequences next.Later in the article, some data measured in the experiment is given to confirm the dissertation. Finally, the idea of network overall optimization based on the above-mentioned content is given.