NLOS环境下低复杂度的UWB-SRAKE接收机性能分析
doi: 10.3724/SP.J.1146.2008.00394
Performance Analysis on Reduced-Complexity UWB SRAKE Receiver under NLOS Environment
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摘要: 该文提出一种适用于NLOS环境UWB多径信道下低复杂度的选择性RAKE接收机(RC-SRAKE)，通过本地参考波形与接收信号的卷积抽样来确定SRAKE的Finger参数，不需要已知信道信息或信道估计过程，降低了复杂度。给出了RC-SRAKE误码率的表达式，分析了Finger数目和信道噪声对RC-SRAKE性能的影响。通过对IEEE.802.15.4a中NLOS信道的仿真实验表明，与能获得准确信道信息的理想SRAKE相比，在Finger数目较少的情况下RC-SRAKE能达到与之相近的性能。Abstract: In this paper, a Reduced-Complexity Selective RAKE (RC-SRAKE) receiver scheme is proposed, which can be adopted in ultra-wideband multipath channel under NLOS environment. It employs a convolution based finger selection algorithm, which has low complexity because it does not require precise channel information or channel estimation. A closed-form expression for symbol error probability of the proposed RC-SRAKE is derived in term of the combined fingers and impulse noise. The derived expressions are evaluated numerically with IEEE 802.15.4a NLOS channel models. It is demonstrated that RC-SRAKE can achieve the approximate performance as to ideal SRAKE with a fewer fingers.
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