Interleaving enhances the quality of digital transmission over the radio fading channel. This enhancement comes at the cost of introducing additional time-delay, memory space requirements, and system complexity. This paper describes commonly used interleaving techniques. It addresses the realization and performance of a convolutional interleaver that cuts down time-delay and memory space increase considerably. Base-band computer simulations are presented for convolutionally coded and interleaved QPSK transmission over Rayleigh and Rician flat-fading channels at different interference levels.
This paper presents some of the challenges facing the introduction of ultra-wideband (UWB) technology in wireless applications intended for commercial use, summarizes relevant regulatory and standards developments, and addresses potential implications on spectrum management and radio regulations.
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