Title :
Analysis of diversity and equalization techniques applied to M-QAM digital mobile radio systems
Author :
Valdovinos, Antonio ; Casadevall, Fernando J.
Author_Institution :
Dept. de Teoria del Senyal i Comunicacions, Univ. Politecnica de Catalunya, Barcelona, Spain
Abstract :
Presents an investigation of diversity and/or equalization techniques applied to 4 and 16-QAM TDMA radio systems for rapid fading dispersive channels. In particular, typical urban (TU) environments have been considered. A least sum of squared errors (LSSE) channel estimator has been introduced in order to allow the analytic calculation of the equalizer coefficients. By means of simulation methods the authors have found that a degradation of 4 dB can be expected in relation to ideal estimation. Furthermore, the degrading effects of non-linear power amplifiers have been analyzed and a degradation of 2 dB has been found
Keywords :
decision feedback equalisers; digital radio; diversity reception; fading; land mobile radio; parameter estimation; power amplifiers; quadrature amplitude modulation; time division multiple access; time-varying channels; 16-QAM; 4-QAM; M-QAM digital mobile radio systems; TDMA radio systems; degradation; diversity; equalization techniques; least sum of squared errors channel estimator; nonlinear power amplifiers; rapid fading dispersive channels; typical urban environments; Computational modeling; Decision feedback equalizers; Degradation; Delay effects; Fading; Finite impulse response filter; Land mobile radio; Matched filters; Nonlinear distortion; Power amplifiers;
Conference_Titel :
Vehicular Technology Conference, 1994 IEEE 44th
Conference_Location :
Stockholm
Print_ISBN :
0-7803-1927-3
DOI :
10.1109/VETEC.1994.345233
