Title :
A low complexity receiver for T-transform based OFDM systems
Author :
Ali, Imran ; Pollok, André ; Luo, Lin ; Davis, Linda
Author_Institution :
Inst. for Telecommun. Res., Univ. of South Australia, Mawson Lakes, SA, Australia
Abstract :
Recently, a T-transform based multicarrier communication system with significant uncoded BER performance improvement over conventional OFDM in a Rayleigh fading channel was proposed. However, due to the involvement of Walsh Hadamard transform (WHT), the T-transform OFDM system does not satisfy the cyclic convolution property and hence fails to diagonalize the channel matrix, resulting in an enormous equalization complexity. In this paper, we propose a new receiver processing mechanism where the T-transform is replaced by two equivalent transforms and the equalization is carried out in between them. The new approach diagonalizes the channel matrix and single tap equalization is possible without any compromise in the performance. The detailed computational complexity of the proposed approach is also presented and compared with some other schemes.
Keywords :
Hadamard transforms; OFDM modulation; Rayleigh channels; error statistics; radio receivers; BER; OFDM system; Rayleigh fading channel; T-transform; WHT; Walsh Hadamard transform; channel matrix; cyclic convolution; equalization complexity; equivalent transform; low complexity receiver; multicarrier communication system; single tap equalization; Bit error rate; Complexity theory; Convolution; Fading; OFDM; Receivers; Transforms;
Conference_Titel :
Personal Indoor and Mobile Radio Communications (PIMRC), 2011 IEEE 22nd International Symposium on
Conference_Location :
Toronto, ON
Print_ISBN :
978-1-4577-1346-0
Electronic_ISBN :
pending
DOI :
10.1109/PIMRC.2011.6139776