scholarly journals Adaptive IIR Filters for Single Interference Suppression in a BPSK DS CDMA System In Rayleigh Fading Channel

2007 ◽  
Vol 30 (1) ◽  
pp. 65-73
Author(s):  
Aloys Mvuma
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Notch Filter ◽  
Rayleigh Fading Channel ◽  
Second Order ◽  
Gradient Algorithm ◽  
Cdma System ◽  
Notch Filters ◽  
Code Division Multiple ◽  
Ber Performance

In this paper, effect of a single narrow-band interference (NBI) on bit error rate (BER) performance for a binary phase shift keying (BPSK) synchronous direct-sequence code-division multiple access (DS CDMA) communication system operating in a frequency nonselective Rayleigh fading channel is analyzed. Second-order adaptive infinite impulseresponse (IIR) notch filters with plain gradient algorithm (GA) for suppression of NBI in the DS CDMA system are proposed. A general closed-form BER expression for the DS CDMA system with NBI suppression second order adaptive IIR notch filters is derived based on the standard Gaussian approximation (SGA) method. BER expressions are then derived for the allpass filter-based adaptive IIR notch filter and adaptive IIR notch filter with constrained poles and zeros, the two structures that are commonly found in literature. It is observed that both adaptive IIR notch filter structures exhibit comparable BER performance. Extensive computer simulation results are presented to verify the accuracy and limitations of the analysis.

scholarly journals Simulation and Analysis of MC-CDMA System under AWGN and Rayleigh Fading Channel

2013 ◽  
Vol 6 (2) ◽  
pp. 336-342
Author(s):  
Bhavana Kulhare ◽  
Dr. Poonam Sinha
Keyword(s):  
Fading Channel ◽  
Rayleigh Fading ◽  
Additive White Gaussian Noise ◽  
Standard Technique ◽  
Multipath Fading ◽  
Rayleigh Fading Channel ◽  
Complete Analysis ◽  
Cdma System ◽  
Spectrum Utilization ◽  
Code Division Multiple

This paper presents a detailed analysis of Multicarrier Code Division Multiple Access (MC-CDMA) system over Additive White Gaussian Noise (AWGN) and Rayleigh Fading Channel with analysisof the effects of different number of sub-carriers and multiuser scenarios and at the end a comparison with standard technique is also performed. The complete analysis is performed by simulating the mathematical model of the MC-CDMA system with various combinations of sub-carriers, number of users, SNR, path gains and path delays etc. the simulation results shows that the MC-CDMA is an effective way to overcome the multipath fading losses and spectrum utilization with relatively simple system architecture.

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