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Codeset Overlay for Complementary Code Keying Direct Sequence Spread Spectrum

Authors:
Farzad Talebi
Thomas Pratt

Keywords: WiFi; CCK; Spread Spectrum; IEEE 802.11b.

Abstract:
A method to improve communications reliabil- ity of complementary code keying in IEEE 802.11b WiFi systems is proposed that involves the use of an overlay signaling dimension that preserves the underlying data rate and power spectrum characteristics of the WiFi signals. The specific overlay technique expands the number of code sets and selects the codeset in a data-dependent man- ner to provide redundancies that improve the error rate performance of the underlying communications scheme. Sequential detection is employed at the receiver, where symbols are recovered using the redundancies embedded in the overlay. The maximum likelihood sequential detection criterion vectors adopted for the scheme correspond to different memory depths, and in the best case achieve gains that are in excess of 3 dB without any rate loss or band-width expansion relative to to the original complementary code keying scheme, and the method can be implemented with reasonable increases in computational complexity.

Pages: 179 to 183

Copyright: Copyright (c) IARIA, 2012

Publication date: September 23, 2012

Published in: conference

ISSN: 2308-4278

ISBN: 978-1-61208-236-3

Location: Barcelona, Spain

Dates: from September 23, 2012 to September 28, 2012