System Capacity Promotion and CoChannel Interference Avoidance in TDD Wireless Communication System

doi:10.13190/jbupt.200905.80.374

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2009, Vol. 32 ›› Issue (5): 80-83.doi: 10.13190/jbupt.200905.80.374

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System Capacity Promotion and CoChannel Interference Avoidance in TDD Wireless Communication System

〗FENG Wenjiang,CHENG Zhongwu,WU Yucheng

(College of Communication Engineering, Chongqing University, Chongqing 400030, China)

Received:2009-02-02 Revised:2009-08-10 Online:2009-10-28 Published:2009-10-28

Abstract

Abstract:

Two limited factors in time division duplex (TDD): capacity loss caused by roundtrip delay in sole cell, large region wireless region access network (WRAN) system and performance degradation caused by co-channel interference in multi-cell environment are analyzed. In WRAN
system, capacity loss was reduced by signal transmission in idle time on the basis of distance between customer premises equipment (CPE) and base station. Simulation results show that uplink capacity increase at least by 5%. In multicell system, an improved time slot allocation method is put forward. It shows that at 1% outage probability, 11～12?dB signaltointerference ratio (SIR) performance is improved compared with no optimization situation, and 2.5～3?dB performance is degraded compared with original time slot allocation method, but system complexity is reduced to (M²-M)/2.

Key words: time division duplex, roundtrip delay, cochannel interference, outage probability

〗FENG Wenjiang,CHENG Zhongwu,WU Yucheng. System Capacity Promotion and CoChannel Interference Avoidance in TDD Wireless Communication System[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2009, 32(5): 80-83.

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System Capacity Promotion and CoChannel Interference Avoidance in TDD Wireless Communication System

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