Title :
Iterative Detection of Multicode DS-CDMA Signals with Strongly Nonlinear Transmitters
Author :
Dinis, Rui ; Silva, Paulo
Author_Institution :
Inst. de Telecomun., FCT-UNL, Lisbon, Portugal
Abstract :
Whenever a DS-CDMA signal is the sum of several components associated to different spreading codes it has high envelope fluctuations and a high peak-to-mean envelope power ratio (PMEPR) setting strong linearity requirements for the power amplifiers. The use of clipping and filtering techniques (which can be repeated several times) was shown to be an effective way of reducing the PMEPR of DS-CDMA signals. We consider an improved receiver where there is an iterative estimation and cancellation of nonlinear distortion effects. The proposed receiver allows significant performance improvements after just a few iterations, even when we have strong nonlinear distortion effects.
Keywords :
code division multiple access; codes; filtering theory; iterative methods; nonlinear distortion; radio receivers; radio transmitters; radiofrequency interference; signal detection; spread spectrum communication; clipping; filtering; iterative estimation; iterative signal detection; linearity requirement; multicode DS-CDMA signal; nonlinear distortion effect cancellation; nonlinear transmitter; peak-to-mean envelope power ratio; power amplifier; receiver; spreading codes; Broadcasting; Degradation; Downlink; Filtering; Fluctuations; Multiaccess communication; Nonlinear distortion; Signal to noise ratio; Telecommunications; Transmitters;
Conference_Titel :
Computer Communications and Networks, 2009. ICCCN 2009. Proceedings of 18th Internatonal Conference on
Conference_Location :
San Francisco, CA
Print_ISBN :
978-1-4244-4581-3
Electronic_ISBN :
1095-2055
DOI :
10.1109/ICCCN.2009.5235357
