Title :
On the misconvergence of CMA blind equalizers in the reception of PN sequences
Author :
Axford, R.A., Jr. ; Milstein, L.B. ; Zeidler, J.R.
Author_Institution :
Naval Command Control & Ocean Surveillance Center, San Diego, CA, USA
Abstract :
This paper presents an investigation of the misconvergence of the constant modulus algorithm (CMA) for blind equalization in the reception of M-ary PSK or QAM signals that are derived from encoding binary PN sequences. Formulas for the period and probability density-function (p.d.f.) of the pseudo-random M-ary sequence as functions of M and the period of the underlying binary PN sequence are given. The distortion of the probabilistic symmetry of the transmitted constellation is also quantified. Simulation results are presented that illustrate the influence of these signal characteristics on the convergence behavior of CMA
Keywords :
binary sequences; convergence of numerical methods; equalisers; modulation coding; phase shift keying; probability; pseudonoise codes; quadrature amplitude modulation; signal sampling; CMA blind equalizers; M-ary PSK signals; QAM signals; binary PN sequences; constant modulus algorithm; encoding; misconvergence; probabilistic symmetry; probability density-function; pseudo-random M-ary sequence; reception; signal characteristics; simulation; transmitted constellation; Blind equalizers; Convergence; Cost function; Encoding; Oceans; Phase shift keying; Probability density function; Quadrature amplitude modulation; Sea surface; Surveillance;
Conference_Titel :
Military Communications Conference, 1994. MILCOM '94. Conference Record, 1994 IEEE
Conference_Location :
Fort Monmouth, NJ
Print_ISBN :
0-7803-1828-5
DOI :
10.1109/MILCOM.1994.473927
