Performance Evaluation of RAKE Receiver for Low Data Rate UWB Systems using Multipath Channels for Industrial Environments

Document type: Researchreports
Full text:
Author(s): Muhammad Gufran Khan, Jörgen Nordberg
Title: Performance Evaluation of RAKE Receiver for Low Data Rate UWB Systems using Multipath Channels for Industrial Environments
Series: Research Report
Year: 2008
Issue: 4
ISSN: 1103-1581
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Signal Processing (Sektionen för teknik – avd. för signalbehandling)
School of Engineering S- 372 25 Ronneby
+46 455 38 50 00
http://www.tek.bth.se/
Authors e-mail: Muhammad.Gufran.Khan@bth.se, Jorgen.Nordberg@bth.se
Language: English
Abstract: Since US FCC passed a resolution in 2002 allowing ultra wideband (UWB) transmissions within a specified unlicensed spectral mask, the interest in UWB technology has grown tremendously. The large bandwidth, low power spectral density (PSD), high multiple access capability and high resolution are some qualities of UWB technology.
For UWB communication systems, the industrial environments are an important scenario. However, due to large number of metallic scatterers in the environment, the multipath offered by UWB channels is dense and many multipath components have significant energy. In this report, the performance evaluation of RAKE receivers for a single user system operating in non-line-of-sight (NLOS) scenarios in industrial environments is presented. The channels used for the evaluation are measured in a medium-sized industrial environment. In addition, the standard IEEE 802.15.4a channel model for NLOS industrial environment is used for comparison with the results of the measured channels. The performance is compared for partial RAKE (PRake) and selective RAKE (SRake) in terms of uncoded bit-error-rate (BER) with the assumption that the channel is known.
The effect of different number of fingers on BER of PRake and Srake is studied. Moreover, the performance of maximal ratio combining (MRC) and equal gain combining (EGC) is compared for PRake and Srake receiver. The results also provide a performance comparison between different Tx-Rx separations. Finally, based on the simulation results, conclusions are presented considering the performance and complexity issues.
Subject: Signal Processing\Detection and Classification
Signal Processing\General
Telecommunications\General
Keywords: UWB, RAKE receiver, Channel Modeling
Note: Ingvar Claesson
URN: urn:nbn:se:bth-00411
Edit