Signal suppression, noise and power division in spread spectrum systems with limiting
Abstract
This paper treats the problem of finding useful spread spectrum signal output components which pass through a bandpass nonlinearity. Any portion of the output which correlates in a statistical sense with one of the input spread signals is to be counted as 'useful output'. Any component which does not correlate is statistically orthogonal and is therefore defined as a residual noise. Expressions are given for the useful component amplitudes, and power division between signals and noise. Our result is quite general and encompasses a good deal of the literature on hard and soft limiters. Some known results are first duplicated as a check in a section on workedout examples. Then an original problem involving QPSK spread spectrum multiple accessing is solved which would be virtually impossible to attack by conventional expansion techniques.
 Publication:

NTC '77; National Telecommunications Conference, Volume 3
 Pub Date:
 1977
 Bibcode:
 1977ntc.....3...35A
 Keywords:

 Bandpass Filters;
 Phase Shift Keying;
 Signal Processing;
 Spread Spectrum Transmission;
 Transmission Efficiency;
 Bit Synchronization;
 Multichannel Communication;
 Nonlinear Filters;
 Statistical Analysis;
 System Effectiveness;
 Communications and Radar