Performance of UWB Systems with Direct-Sequence Bipolar Pulse Amplitude Modulation and RAKE Reception over IEEE 802.15.3a Channel
Direct-Sequence Pulse Amplitude Modulation (DS-PAM) has been widely proposed for Ultra-Wideband (UWB) communication systems because it provides better performance with low computational complexity. UWB signals suffer from severe multi-path interference when employed in indoor fading environments. But using RAKE reception can make use of the rich multi-path of UWB systems to improve system performance. In this paper we present the performance of a RAKE receiver employing maximal ratio combining (MRC) in a DS UWB system with BPAM modulation. Performance in a practical multi-path fading Channel (IEEE 802.15.3a Channel) is considered to analyze the performance of DS-PAM UWB systems with different RAKE receivers. The bit error rate (BER) of ARake, PRake, and SRake over DS-BPAM UWB systems is simulated. The results indicate that ARake has the best performance, SRake is better than PRake when the number of fingers is the same.