Novel DS-UWB Partial RAKE Receiver Over Different UWB Channels

ABSTRACT

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.

Keywords:

• MRC
• Multipath channel
• RAKE receiver
• Saleh–Valenzuela channel model
• UWB technology

ACKNOWLDGEMENTS

We, authors, are thankful to reviewer and editor for their constructive comments.

Additional information

Notes on contributors

Twinkle Doshi

Twinkle Doshi is presently working as head and associate professor in Electronics & Communication Engineering Department of BITS Edu Campus. She has 12 years of academic experience. She received her ME degree in automatic control and robotics engineering from Electrical Departmen, MS University Of Baroda, India, in 2004. She is currently working towards her PhD degree at Electronics Department, SVNIT, Surat. Her current research interest lies in the area of optimization techniques for DS-UWB RAKE receiver and wireless communication. She is a life member of ISTE. She is recipient of the scholarship for post-graduation from ABB, Baroda.

E-mail: [email protected]

Upena Dalal

(Mrs.) Upena. D. Dalal is presently working as head and associate professor in Electronics Engineering Department of S. V. National Institute of Technology, Surat, INDIA. She has 20 years of academic experience. She completed her BE (electronics) from SVRCET, Surat, in 1991 and obtained ME (electronics & communications) from DDIT, Nadiad, with gold medal. She obtained PhD from SVNIT in 2009. She is also awarded with 5th N.V. Gadadhar memorial Award by IETE and Rashtriya Gaurav Award as well as International Gold Star Award by India International Friendship Society. She has received Divya Bhaskar women of the year award in 2010. She has published 60+ conference and journal papers at national and international level. She has guided many UG and PG projects, dissertations, and seminars in the area of advance communication systems. She guides 14 research scholars presently. Her book on Wireless Communication is published by Oxford University Press in July 2009. One more book edited by her and Dr Y. P. Kosta entitled WiMax New Developments is published by Inteh, Vienna, Austria. She has organized eight national-level training programmes and is a conference member of IEEE, LM-IETE, LM-IE, LM-ISTE, and LM-IJERIA.

E-mail: [email protected].