【摘要】 在TD-SCDMA HSDPA系统3GPP协议的基础上,提出了基于发送端信道编码比特与接收端解速率匹配后软比特之间的平均互信息的链路模型.本模型以互信息为接口参数,采用QPSK比特信噪比合并、16QAM信噪比等效等建模方法,考虑了TD-SCDMA HSDPA系统速率匹配、HARQ合并、16QAM星座重排等因素的影响.仿真结果表明,该链路模型在瑞利衰落信道,QPSK和16QAM调制方式下的块误码率(BLER)误差均在0.2~0.3 dB以下.且模型具有仿真数据量少、时间复杂度低和扩展性好的优点.更多还原

【Abstract】 Based on the analysis of 3GPP protocol for TD-SCDMA high speed downlink packet access(HSDPA) system,this paper proposes a link model that estimates transmission block error rate using the average MI between the channel-encoded bit at the transmitter and the post-rate-dematching soft bit at the(receiver.) This link model uses methods like QPSK bit SNR combining and 16QAM SNR equivalence to(incorporate) the TD-SCDMA HSDPA characteristics including rate matching,hybrid automatic repeat request(HARQ) combining,16QAM constellation rearrangement naturally.The simulation result shows the proposed link model has an accuracy of 0.2～0.3 dB under Rayleigh-fading channels and using either QPSK or 16QAM modulation.The proposed link model requires 10 to 20 percent of simulation data of that of AVI model,maintains a low complexity and can be easily extended to future systems.更多还原