摘要
在超宽带(Ultra-Wideband或Ultra-Wide bandwidth,简称UWB)室内密集多径的传输环境下,传统的Rake接收机在分集接收时需要进行信道参数估计。此外,为了收集多径能量,其相关接收器组的抽头数也要求较高,因而增加了接收机结构的复杂度,不利于在实际中应用。基于自适应信号检测算法在DS CDMA系统中具有算法简单以及较强的抗干扰性能等优点,提出了以自适应MMSE(Minimum Mean Square Error)接收机为核心的直扩超宽带(DS UWB)室内高速无线链路的实现方案,并从理论上推导出了该方案在IEEE 802.15.3a信道模型中的误码性能。仿真结果表明,在基本不损失误码性能的前提下,方案与采用传统Rake接收机的方案相比,不需要信道估计,从而具有结构简单、易于实现等优点。
In ultra-wideband （UWB） indoor dense multipath environments, traditional coherent Rake receiver requires channel estimation. Moreover, in order to collect enough signal energy from dense multipath components, the number of Rake fingers must be large enough. Consequently, the receiver structure is too complex to be implemented in practice. However, we know that adaptive signal detection performs well in DS-CDMA systems due to its simple algorithm and robustness of anti-interference. In this paper, we propose an indoor link scheme based on adaptive minimum mean square error （MMSE） receiver for DS-UWB transmission. Its bit error rate （BER） performance in the newly proposed IEEE 802. 15.3a UWB indoor channel model is analyzed theoretically. The simulation results show that, nearly without loss of BER performance, compared with the traditional Rake receiver scheme, the new scheme requires no channel estimation and, therefore, is simpler in structure and easier for implementation.
出处
《北京石油化工学院学报》
2009年第3期28-33,共6页
Journal of Beijing Institute of Petrochemical Technology
