Multi-Antenna OFDM System Using Coded Wavelet with Weighted Beamforming

A major drawback in deploying beamforming scheme in orthogonal frequency division multiplexing (OFDM) is to obtain the optimal weights that are associated with information beams. Two beam weighting methods, namely co-phasing and singular vector decomposition (SVD), are considered to maximize the signal beams for such beamforming scheme. Initially the system performance with and without interleaving is investigated using coded fast Fourier transform (FFT)-OFDM and wavelet-based OFDM. The two beamforming schemes are applied to the wavelet-based OFDM as confirmed to perform better than the FFT-OFDM. It is found that the beam-weight by SVD improves the performance of the system by about 2dB at the expense of the co-phasing method. The capacity performances of the weighting methods are also compared and discussed.

Keywords

Beamforming, steering, MIMO, wavelet, OFDM, ISI, FFT, LTE, beam-weight

Citation

Radioengineering. 2014, vol. 23, č. 1, s. 356-361. ISSN 1210-2512
http://www.radioeng.cz/fulltexts/2014/14_01_0356_0361.pdf

Document type

Peer-reviewed

Document version

Published version

Language of document

en

Document licence

Creative Commons Attribution 3.0 Unported License
http://creativecommons.org/licenses/by/3.0/