An optimized transmitter precoding scheme for synchronous DS-CDMA

A technique is presented to reduce the multiple-access interference in the forward link of a direct-sequence code-division multiple-access system. For each symbol period, an energy-constrained nonlinear transformation is applied at the transmitter output to minimize the mean-squared error at the rec...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on communications 2006-01, Vol.54 (1), p.32-36
Main Authors: Hons, E.S., Khandani, A.K., Tong, W.
Format: Article
Language:English
Subjects:
Additive white noise
Algorithms
Amplification
Applied sciences
AWGN
Code-division multiple access (CDMA)
Coding, codes
Costs
Decorrelation
Detectors
Error correction codes
Exact sciences and technology
Gaussian noise
Information, signal and communications theory
interference cancellation
Links
Multiaccess communication
Multiple access interference
multiple-access channels
Nonlinearity
quadratic optimization
Signal and communications theory
Stations
Symbols
Telecommunications and information theory
Transformations
transmitter precoding
Transmitters
trust region
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A technique is presented to reduce the multiple-access interference in the forward link of a direct-sequence code-division multiple-access system. For each symbol period, an energy-constrained nonlinear transformation is applied at the transmitter output to minimize the mean-squared error at the receiver, subject to a constraint on the peak transmitted energy. The proposed algorithm can be implemented with existing optimization techniques that solve the quadratic trust-region problem. It is shown that in the presence of forward error-correction codes, the proposed method results in a significant gain over earlier known techniques at the cost of a modest increase in computational complexity at the base station. Another advantage of the proposed precoder is that it caps the peak energy (while earlier methods cap the average energy), requiring less sophisticated power amplifiers.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2005.861691