Paper Info
Title
Complexity reduction techniques for blind adaptive beamforming in OFDM antenna arrays
Abstract
In this paper, we propose two complexity reduction techniques for blind adaptive beamforming in orthogonal frequency division multiplexing (OFDM) antenna array systems. For each sub-carrier, a beamformer with generalized sidelobe canceller (GSC) structure is designed according to the constrained constant modulus (CCM) criterion with weight vectors adaptation based on the recursive least squares (RLS) method. The two techniques that we propose for complexity reduction rely on frequency domain interpolation and spatial domain clustering, respectively. The former exploits the coherence bandwidth of the radio channel, so that only the weight vectors at selected frequencies need to be adapted, while the remaining weight vectors are obtained via interpolation. The latter relies on the partitioning of the receiving array into sub-arrays of smaller size. In addition, a combination of these two techniques is proposed to further reduce the complexity. A complexity analysis is presented to quantify the computational savings offered by the proposed techniques. Finally, simulation results are provided to illustrate that these savings can be obtained at the price of only a minor, acceptable loss in performance when compared to the direct application of the conventional CCM-RLS-GSC beamforming algorithm to the wideband OFDM antenna array systems.
Year
DOI
Venue
2014
10.1109/WCSP.2014.6992162
WCSP
Keywords
DocType
Citations 
computational saving,RLS method,spatial domain clustering,frequency domain interpolation,weight vector adaptation,interpolation,vector,adaptive signal processing,frequency interpolation technique,receiving antennas,generalized sidelobe canceller structure,OFDM modulation,orthogonal frequency division multiplexing,communication complexity,CCM criterion,broadband antennas,radio channel,antenna arrays,complexity reduction technique,constrained constant modulus criterion,array signal processing,recursive least square method,least squares approximations,OFDM antenna array system,OFDM,receiving antenna array,spatial clustering technique,blind adaptive beamforming,vectors,Blind adaptive beamforming,GSC structure
Conference
0
PageRank 
References 
Authors
0.34
7
4
Name
Order
Citations
PageRank
Boya Qin1193.38
Yunlong Cai226028.76
Benoît Champagne3191.89
Minjian Zhao411827.18