Uplink performance evaluation of multicode DS/CDMA systems in the presence of nonlinear distortions
- 1 August 2000
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal on Selected Areas in Communications
- Vol. 18 (8) , 1418-1428
- https://doi.org/10.1109/49.864007
Abstract
This paper investigates the behavior of multicode direct sequence code division multiple access (DS/CDMA) systems in the presence of nonlinear distortions caused by high power amplifiers. The performance of the multicode system can be degraded due to a large variation in the envelope of the multicode signal. A technique that uses a small number of parallel transmitted sequences is proposed for combating the nonlinearity. This technique ran be modified to have a constant envelope for achieving further performance improvement. Comprehensive comparisons are made for different systems, based on both theoretical analysis and computer simulation. Our study shows that the technique employing a few parallel transmitted sequences, in conjunction with quasi-ML (maximum likelihood) detection, and the use of the modified scheme, are very effective for combating the nonlinearity.Keywords
This publication has 12 references indexed in Scilit:
- Performance evaluation of parallel combinatory SSMA systems in Rayleigh fading channelPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Analysis of non-linear distortions on MC-CDMAPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Impact of imperfect CSI estimation on multidimensional communication systems over a Rayleigh fading channelPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1999
- A hybrid analytical-simulation procedure for performance evaluation in M-QAM-OFDM schemes in presence of nonlinear distortionsIEEE Transactions on Vehicular Technology, 1998
- An adaptive data predistorter for compensation of nonlinear distortion in OFDM systemsIEEE Transactions on Communications, 1997
- An application of MMSE predistortion to OFDM systemsIEEE Transactions on Communications, 1996
- Quantization analysis and design of a digital predistortion linearizer for RF power amplifiersIEEE Transactions on Vehicular Technology, 1996
- Adaptive linearization using predistortion-experimental resultsIEEE Transactions on Vehicular Technology, 1994
- Channel coding with multilevel/phase signalsIEEE Transactions on Information Theory, 1982
- Performance Evaluation for Phase-Coded Spread-Spectrum Multiple-Access Communication--Part I: System AnalysisIEEE Transactions on Communications, 1977