Low-complexity adaptive step size constrained constant modulus SG algorithms for adaptive beamforming

2009 ◽  
Vol 89 (12) ◽  
pp. 2503-2513 ◽  
Author(s):  
Lei Wang ◽  
Rodrigo C. de Lamare ◽  
Yun Long Cai
Keyword(s):  
Low Complexity ◽  
Adaptive Beamforming ◽  
Constant Modulus ◽  
Step Size ◽  
Adaptive Step Size ◽  
Adaptive Step

Adaptive Step-Size Constant-Modulus Algorithm for High-Speed Optical Coherent Communication System

2012 ◽  
Vol 32 (10) ◽  
pp. 1006004 ◽  
Author(s):  
邸雪静 Di Xuejing ◽  
童程 Tong Cheng ◽  
张霞 Zhang Xia ◽  
张晓光 Zhang Xiaoguang ◽  
席丽霞 Xi Lixia
Keyword(s):  
Communication System ◽  
High Speed ◽  
Constant Modulus ◽  
Constant Modulus Algorithm ◽  
Step Size ◽  
Adaptive Step Size ◽  
Coherent Communication ◽  
Adaptive Step

scholarly journals Analysis of Low Complexity Adaptive Step-size Orthogonal Gradient-based FEQ for OFDM Systems

1970 ◽  
Vol 5 (2) ◽  
pp. 134-145
Author(s):  
Suchada Sitjongsataporn
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Weighted Least Squares ◽  
Low Complexity ◽  
Gradient Algorithm ◽  
Frequency Division ◽  
Ofdm Systems ◽  
Step Size ◽  
Adaptive Step Size ◽  
Gradient Based ◽  
Adaptive Step

We propose two low complexity adaptive step-size mechanisms based on the normalised orthogonal gradient algorithm for frequency-domain equalisation in orthogonal frequency division multiplexing (OFDM) systems. These algorithms are derived from employing a mixed-subcarrier exponentially weighted least squares criterion. Two low complexity adaptive stepsizeapproaches are investigated by exploiting an estimate of autocorrelation between previous and present weight-estimated mixed-subcarrier errors. We compare our approaches with a previously fixed stepsize normalised orthogonal gradient adaptive algorithm and other existing algorithm for implementation. Simulation results demonstrate that the proposed algorithms can achieve good performance for involving an OFDM receiver.

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