Time division multiplex and time reversal based IDMA wireless communication scheme

Abstract

The invention discloses a IDMA ascending and descending communication system based on time-division multiplex (TDD)and time reverse (TR), named as time-division multiplex time reverse interlace multiple address (TDR-IDMA)system, wherein the invention uses time-division complex to reversely rotate the respond time of channel impact and taking reverse value as the front signal processor at the receiver of ascending channel and the signal pre-treating device at the sender of the descending channel. Via the weak correlation of channel impact responses of different users, the front signal processor can effectively restrain multiple user interferences, thereby the iterate multi-user check at the receiver of base station can be quickly contracted, and the signal preprocessor at the sender of the descending channel can support the signal check of mobile terminal, and the time-division multiplex can arrange channel evaluator of mobile receiver to base station, to simply the complexity of descending receiver most and improve descending data transmission rate. Compared with traditional IDMA system, the TDR-IDMA has quick multi-user and simplified mobile device.

Description

technical field [0001] The invention belongs to the field of wireless communication signal processing, such as wireless communication multiple access technology, iterative detection technology and multiple input multiple output technology. Background technique [0002] The traditional IDMA system introduces the idea of ​​turbo code iterative decoding into the wireless communication system, which greatly improves the performance of the IDMA system compared with other communication systems. The IDMA system removes the special spreader on the basis of CDMA. Simplifies the structure of the transmitter and uses low-rate coding to increase the coding gain, and effectively combines spread spectrum and coding to greatly improve the spectral efficiency. At the same time, the work of distinguishing multiple users is handed over to the interleaver. Different users use different interleavers, and chip-level iterative detection is used at the receiving end. The algorithm is simple, and t...

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Problems solved by technology

[0003] The main disadvantage of the traditional IDMA system: Since the base station receiving end of the IDMA system adopts an iterative detection structure, the number of iterations directly affects the final bit error rate of the system

The simulation results show that for the traditional IDMA system, when 24 users only use repetitive coding, it generally requires 15 or more iterations before the system can converge. For details, see: [1] LiPing, L.Liu, K.Y.Wu , and W.K.Leung, Interleave-division multiple-access (IDMA) communications, in Proc.3rd International Symposium on Turbo Codes & Related Topics, pp.173-180, 2003; [2] Li Ping and L.Liu, Analysis and design of IDMAsystems based on SNR evolution and power allocation, in Proc.VTC'2004-Fall, LosAngles, CA, Sept.2004; [3] Li Ping, Lihai Liu, Keying Wu and W.K.Leung.Interleave-Division Multiple-Access.IEEE Transactions on Wireless Communication, VOL.5, NO.4, April 2006, PP.938-947; however, the future wireless communication system is a multi-service, high-speed system with high requirements for speed, and the number of iterations has become the speed bottleneck of the traditional IDMA system

Different mobile users are distinguished by the interleaving scheme of the interleaver. It is impossible to obtain the interleaving schemes of other users at the mobile user end, and iterative detection is difficult to implement at the mobile user end.

Multi-user interference and inter-symbol interference cannot be overcome by iterative detection

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