An Algorithm to Use in Adaptive Wideband Duplexer for Software Radio

Shyama KANNANGARA  Michael FAULKNER  

Publication
IEICE TRANSACTIONS on Communications   Vol.E86-B   No.12   pp.3452-3455
Publication Date: 2003/12/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Software Defined Radio Technology and Its Applications)
Category: 
Keyword: 
duplexer,  cancellation,  algorithm,  software radio,  

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Summary: 
This paper proposes a new algorithm to control an adaptive duplexer for multiband software radio. It uses a wideband low isolation device combined with a two-tap/two-loop adjustable canceller to eliminate the need for multiple switched high isolation duplexers. The taps are adjusted to provide isolation peaks in the transmit and receive bands. The algorithm is based on the superposition of squared errors and achieved 66 dB isolation of the transmit signal and a 37 dB cancellation of the transmitter noise in the receiver band.