For Full-Text PDF, please login, if you are a member of IEICE,|
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
Enhancement of Constant Amplitude Coding for Multicode Wideband CDMA Systems
Su Il KIM Gill Young JUNG Soon Young YOON Hwang Soo LEE
IEICE TRANSACTIONS on Communications
Publication Date: 2000/11/25
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
muticode wideband CDMA, constant amplitude transmission, HPA, peak-to-average power ratio, PAPR,
Full Text: PDF>>
A constant amplitude transmission scheme for multicode wideband CDMA systems is proposed. Multicode wideband CDMA systems result in large amplitude fluctuation because the multicode signal is the sum of constituent code channel signals. This large amplitude fluctuation brings out large non-linear distortion and then, if unaccounted, can significantly degrade the bit error rate (BER) performance. Constant amplitude transmission, achieved by using a Walsh code and parity generator, is proposed to combat the large amplitude fluctuation and reduce the peak-to-average power ratio (PAPR). Unlike other constant amplitude transmission scheme, the proposed scheme does not use a redundant code channel. Computer simulation results show that the proposed scheme improves BER performance significantly and that the proposed scheme is extremely effective to the non-linear distortion of high power amplifier (HPA).