【英文摘要】 In recent years,smart antennas technology has become one of the most attractive technologies in mobile communications. By smart antennas technology,mobile base station can reduce interference materially,enhance system performance and improve system capacity.In this paper,we analyze the Carrier-to-Interference-and-Noise-Ration and interference based on TD-SCDMA system,mainly examine the capacity improvement at different BER (bit error rate) and path loss.Computer calculation and simulations have also been ca...
【英文摘要】 Joint Detection technology is a hot point in the research of TD-SCDMA system.Because of a SNR degradation,JD can not reach the need of system performance when system loads is close to the spread factor.MSJD and iterative multi-user detection are put forth to overcome the problem.When iterative MUD is adopted,the research shows that system performance is close to single user performance after 3 iterations,but its computational complexity grows exponentially with the number of code channel.When MSJD is adopte...
【英文摘要】 A scheme of extended joint detection was presented,which was used to cancel strong adjacent cell interference(ACI) and intra cell interference.The spread code was judged and the channel characteristic of severe ACI was estimated first.Then the system matrix was extended with such information to joint detect with the users in desired cell,canceling ACI and intra cell interference simultaneously.Simulation results show that the severe ACI in time division-synchronous code division multiple access(TD-SCDMA) sy...
【英文摘要】 The adoption of B. Steiner channel estimation algorithm is prevalent in TD-SCDMA system. However, the estimated channel impulse responses are affected by the noise in the channel, therefore their amplitudes and delays are larger than the real channel impulse responses. Two improved algorithms are proposed, both of which set gates for the channel impulse responses. The simulation results show that both the outputs of channel estimator and the system performance are improved by adopting the gate method.