Improving the Performance of UWB Wireless Rake Receiver By using New Combining Technique
R. Fayadh, and S. Mohammed.
International Journal of Emerging Science and Engineering (IJESE) 5 (7): 20-26 (July 2018)

In wireless communication system, the signals are arriving to the receiver in terms of general summation for several "multipath components (MPCs)" through "direct line of sight (LOS) and indirect non line of sight (NLOS)". Multipath occurs due to "reflection, diffraction, and scattering" of transmitted signal. “MPCs” are considered one of the main problem in wireless communication system especially in ültra-wideband (UWB)" system because these “MPCs” have a different amplitudes, phases, and delays with respect to the transmitted signals and cause signal distortions and fading that degrade the quality of the received signal and lead to poor performance in wireless communication systems, However multipath phenomena is used to enhance system performance by using a dedicated wireless receiver such as wireless "rake receiver" to resolve the “MPCs” and reduce "multipath fading" effects to improve system performance. The combiner is a main part of rake receiver that coherently combines “MPCs” using one of the combining schemes to form a complete replica of a transmitted signal to capture most of the energy of the received signal. By this combiner, the system can achieve better performances that lead to maximize the average "signal to noise ratio (SNR)" to recover the transmitted signal with lower "bit error rate (BER)". This technique is suitable for ÜWB" wireless devices that are commonly used for high-speed data rate through short-range indoor wireless communication. In this paper new combiner was proposed to enhance the combining performance of ÜWB" wireless rake receiver named adaptive partial-hybrid (AP-H) combiner. For comparison, the two conventional combiners: "selective combiner and partial combiner" were designed. The simulation results were obtained by using MATLAB software, these results shown higher system performance when using the proposed AP-H combiner than other conventional combiners. For this work ÜWB" signal was used with binary phase shift keying-Time Hopping (BPSK-TH) multiple access modulation scheme
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