Frequency-Domain Pre-Rake Transmission for DSSS/TDD Mobile Communications Systems

Fumiyuki ADACHI
Kazuaki TAKEDA
Hiromichi TOMEBA

IEICE TRANSACTIONS on Communications   Vol.E88-B    No.2    pp.784-787
Publication Date: 2005/02/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.2.784
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
frequency-domain equalization,  pre-rake,  spread spectrum,  mobile radio,  

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In this Letter, a frequency-domain pre-rake transmission is presented for a direct sequence spread spectrum with time division duplex (DSSS/TDD) system under a frequency-selective fading channel. The mathematical relationship between frequency-domain and time-domain pre-rake transmissions is discussed. It is confirmed by the computer simulation that, similar to the time-domain pre-rake transmission, frequency-domain pre-rake transmission can improve the bit error rate (BER) performance. The frequency-domain pre-rake transmission shows only slight performance degradation compared to the frequency-domain rake reception for large SF.