Title :
LNA phase distortion effect on the constant modulus algorithm in CDMA systems
Author :
Dadashzadeh, G. ; Hakkak, M. ; Jedari, E. ; Kamarei, Mahmoud
Author_Institution :
Tarbiat-Modares Univ., Tehran, Iran
Abstract :
We propose a modified CMA (constant modulus algorithm) with a generalized GWSSUN channel model for a blind adaptive array in code division multiple access (CDMA) systems. Also, we analyze the AM-PM conversion as a phase statement of desensitization of an LNA (low noise amplifier) on CDMA signals to study the BER performance in the modified CMA. Simulation results of BER performance with DBPSK modulation for a linear array are shown; when the interference is stronger, the radiation patterns are affected by AM-PM conversion, indicating the need for regular calibration.
Keywords :
adaptive antenna arrays; amplifiers; amplitude modulation; antenna radiation patterns; array signal processing; code division multiple access; differential phase shift keying; distortion; error statistics; linear antenna arrays; radiofrequency interference; AM-PM conversion; BER performance; CDMA systems; CMA; DBPSK modulation; LNA phase distortion effect; blind adaptive array; code division multiple access; constant modulus algorithm; linear array; low noise amplifier; radiation patterns; Adaptive arrays; Bit error rate; Calibration; Interference; Low-noise amplifiers; Multiaccess communication; Performance analysis; Phase distortion; Phase noise; Signal analysis;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2003. IEEE
Conference_Location :
Columbus, OH, USA
Print_ISBN :
0-7803-7846-6
DOI :
10.1109/APS.2003.1217409
