采用串行干擾消除技術(shù)的多速率單小區(qū)CDMA系統(tǒng)性能分析
Performance of Multi-rate Single Cell CDMA Systems with Linear Successive Interference Cancellation
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摘要: 串行干擾消除(SIC)技術(shù)可以有效抑制多址干擾(MAI)，顯著提高DS-CDMA系統(tǒng)容量。該文針對單小區(qū)DS-CDMA移動通信系統(tǒng)的上行鏈路，推導(dǎo)出在加性高斯白噪聲信道條件下，采用匹配濾波器的傳統(tǒng)單用戶接收機(jī)雙速率系統(tǒng)、線性SIC雙速率系統(tǒng)以及理想SIC雙速率系統(tǒng)的容量極限，并給出了數(shù)值結(jié)果。研究結(jié)果表明，在任何條件下，相對于傳統(tǒng)的單用戶接收機(jī)系統(tǒng)，采用線性SIC技術(shù)能顯著提高系統(tǒng)容量。另外，隨著系統(tǒng)中用戶數(shù)目的增多，理想SIC和線性SIC的接收功率之間的差異越來越大，因此，對實(shí)際的多速率SIC系統(tǒng)進(jìn)行功率分配時(shí)，不能簡單地用理想SIC模型來替代實(shí)際的線性SIC系統(tǒng)，以免系統(tǒng)性能嚴(yán)重惡化。
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關(guān)鍵詞:
- DS-CDMA;多用戶檢測;串行干擾消除;系統(tǒng)容量;接收功率
Abstract: Successive Interference Cancellation (SIC) can effectively mitigate Multiple Access Interference (MAI) and improve the capacity of Direct-Sequence Code-Division Multiple Access (DS-CDMA) systems. In this paper, for the uplink of a single cell DS-CDMA system, the capacity limits of a conventional single-user detection receiver, a system with linear SIC receiver, and a system with perfect SIC are derived for an Addictive White Gaussian Noise (AWGN) channel. The results show that the linear SIC system can provide a much larger capacity compared with the conventional system in all cases. Moreover, with increasing of the number of the users in the system, the difference between the whole power of the perfect SIC and that of the linear SIC increases. So, if the perfect SIC is used to guide the power allocation, the resulting performance will be significantly worse than predicted. -
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