System Capacity Promotion and Co-Channel Interference Avoidance in TDD Wireless Communication System
Yucheng Wu · Beijing Youdian Xueyuan xuebao · 2009
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.