在研究IEEE802.16标准关于VoIP传输机制的基础上,指出语音流的静默特性严重制约了VoIP的容量。通过分析VoIP业务流的统计特性得出了在统计复用情况下VoIP的容量极限。提出了一种基于统计复用的带宽调度方法及其实现算法,以克服由于语音...在研究IEEE802.16标准关于VoIP传输机制的基础上,指出语音流的静默特性严重制约了VoIP的容量。通过分析VoIP业务流的统计特性得出了在统计复用情况下VoIP的容量极限。提出了一种基于统计复用的带宽调度方法及其实现算法,以克服由于语音静默带来的语音速率波动。仿真结果表明,该调度方法与UGS（unsolicited grant service）调度相比能够显著提升VoIP的容量,同时使BS和SS之间的VoIP丢包率和传输时延保持在0.02%和5.1ms以下。展开更多
In this paper, the effect of imperfect channel state information at the receiver, which is caused by noise and other interference, on the multi-access channel capacity is analysed through a statistical-mechanical appr...In this paper, the effect of imperfect channel state information at the receiver, which is caused by noise and other interference, on the multi-access channel capacity is analysed through a statistical-mechanical approach. Replica analyses focus on analytically studying how the minimum mean square error （MMSE） channel estimation error appears in a multiuser channel capacity formula. And the relevant mathematical expressions are derived. At the same time, numerical simulation results are demonstrated to validate the Replica analyses. The simulation results show how the system parameters, such as channel estimation error, system load and signal-to-noise ratio, affect the channel capacity.展开更多
文摘在研究IEEE802.16标准关于VoIP传输机制的基础上,指出语音流的静默特性严重制约了VoIP的容量。通过分析VoIP业务流的统计特性得出了在统计复用情况下VoIP的容量极限。提出了一种基于统计复用的带宽调度方法及其实现算法,以克服由于语音静默带来的语音速率波动。仿真结果表明,该调度方法与UGS（unsolicited grant service）调度相比能够显著提升VoIP的容量,同时使BS和SS之间的VoIP丢包率和传输时延保持在0.02%和5.1ms以下。
基金Project supported by the National Nature Science Foundation of China (Grant Nos 60773085 and 60801051)
文摘In this paper, the effect of imperfect channel state information at the receiver, which is caused by noise and other interference, on the multi-access channel capacity is analysed through a statistical-mechanical approach. Replica analyses focus on analytically studying how the minimum mean square error （MMSE） channel estimation error appears in a multiuser channel capacity formula. And the relevant mathematical expressions are derived. At the same time, numerical simulation results are demonstrated to validate the Replica analyses. The simulation results show how the system parameters, such as channel estimation error, system load and signal-to-noise ratio, affect the channel capacity.
