Signals, systems, and transforms
Signals, systems, and transforms
Error control systems for digital communication and storage
Error control systems for digital communication and storage
Neural Networks: A Comprehensive Foundation
Neural Networks: A Comprehensive Foundation
GSM and Personal Communications Handbook
GSM and Personal Communications Handbook
Asynchronous Parallel Pattern Search for Nonlinear Optimization
SIAM Journal on Scientific Computing
On the Convergence of Pattern Search Algorithms
SIAM Journal on Optimization
Pattern Search Algorithms for Bound Constrained Minimization
SIAM Journal on Optimization
Pattern Search Methods for Linearly Constrained Minimization
SIAM Journal on Optimization
OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting
OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting
GSM, Gprs and Edge Performance
GSM, Gprs and Edge Performance
On the Convergence of Asynchronous Parallel Pattern Search
SIAM Journal on Optimization
Error Correction Coding: Mathematical Methods and Algorithms
Error Correction Coding: Mathematical Methods and Algorithms
Implementing Generating Set Search Methods for Linearly Constrained Minimization
SIAM Journal on Scientific Computing
Communication Systems
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This study considers the problem of transmitting generic (non-speech) data through compressed voice channels such as those used in wireless communications networks. These networks employ voice codecs that are designed to efficiently encode and reproduce the relatively slow-changing signals of human speech, which leads to communication channels that are nonlinear and have long-term memory. A data modem is presented that utilizes finite alphabets of waveforms that are numerically optimized to be as separable as possible after passing through the voice codec. The optimization of the finite alphabet is performed using a pattern search algorithm. When used with the GSM Enhanced Full-Rate Voice Codec, this system demonstrated improved performance, in terms of error rates, compared to previously reported results. Simulation results for four other voice codecs are also presented.