科研之友
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摘要
Ultra-wideband (UWB) is a wireless technology for transmitting large amounts of digital data over a wide spectrum of frequency bands with very low power for a short distance. This technology is useful for indoor communication. However, it generates many multipaths. So, to obtain optimum result, RAKE receiver is to be used. The complexity associated with a RAKE receiver can be minimized by using reduced number of fingers. To address the above-mentioned issue of complexity in RAKE receiver, two methods like partial combining (called PRAKE) and selective combining (called SRAKE) are evaluated. The PRAKE receiver exhibits less optimum performance by combining first arriving multipath components, while the SRAKE combines the strongest multipath components and gives better results. SRAKE has to keep track of all multipath components in order to select the best multipath which leads to increase in complexity. A novel algorithm that introduces a predefined cut-off value for the multipath amplitude gain level is proposed for the PRAKE. It is shown that though the complexity is increased to some extent, the performance of the PRAKE improves to a level comparable to that of SRAKE. The responses of SRAKE, PRAKE, and proposed novel PRAKE are analysed for different channel conditions like line of sight and non-line of sight using Saleh-Valenzuela channel model.
- 出版日期2015-11-2
