Title :
Performance of multi-level modulation in MMSE receiver based CDMA systems
Author :
Almutairi, Ali E. ; Latchman, Haniph A. ; Miller, Scott L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
fDate :
6/21/1905 12:00:00 AM
Abstract :
This paper studies the effect of using higher order modulation formats in the performance of minimum mean-squared error (MMSE) receiver based direct-sequence (DS) code-division multiple access (CDMA) systems in terms of the bit error rate (BER) at different loading levels in additive white Gaussian noise (AWGN) and slow fading channels. The performance of BPSK, QPSK, and 16 QAM modulation formats are compared and analytical and simulation results are presented in terms of the symbol error rates for these different modulation formats. A comparison of the rejection of the near-far effects for each modulation scheme is also presented. Under a high loading level, 16 QAM outperforms QPSK and BPSK for identical bandwidth and information rate while at a moderate loading levels, QPSK represents the best option
Keywords :
AWGN; cellular radio; code division multiple access; error statistics; fading channels; interference suppression; least mean squares methods; multiuser channels; quadrature amplitude modulation; quadrature phase shift keying; radio receivers; radiofrequency interference; 16 QAM; AWGN; BER; BPSK; DS-CDMA; MMSE receiver based CDMA systems; QPSK; additive white Gaussian noise; bandwidth; bit error rate; cellular systems; direct-sequence code-division multiple access; high loading level; higher order modulation formats; information rate; loading levels; minimum mean-squared error; multi-level modulation; multiple access interference suppression; near-far effects rejection; performance; simulation results; slow fading channels; symbol error rates; AWGN; Additive white noise; Analytical models; Binary phase shift keying; Bit error rate; Fading; Multiaccess communication; Performance analysis; Quadrature amplitude modulation; Quadrature phase shift keying;
Conference_Titel :
Military Communications Conference Proceedings, 1999. MILCOM 1999. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-5538-5
DOI :
10.1109/MILCOM.1999.822713