Pre-FFT combining with balanced subcarrier performance for STBC-OFDM systems

Author

Hsieh, Yun-Jung ; Shieh, Hong-Wei ; Lee, Yinman

Author_Institution

Grad. Inst. of Commun. Eng., Nat. Chi Nan Univ., Nantou, Taiwan

fYear

2009

fDate

8-10 Dec. 2009

Firstpage

1

Lastpage

5

Abstract

Recently, pre-fast Fourier transform (pre-FFT) combining has been introduced for space-time block-coded (STBC) orthogonal frequency division multiplexing (OFDM) systems. Despite the complexity reduction, the resultant signal-to-noise ratio (SNR) values of different subcarriers are often not balanced, and it limits the system performance. In this paper, we propose to use the max-min fair criterion for pre-FFT combining in STBC-OFDM systems to solve the problem. Semidefinite relaxation (SDR) is employed to approximate the solution. Simulation results show that the error-rate performance of the proposed pre-FFT combining scheme can be improved as compared with that of the conventional one under various numbers of transmit/receive antennas and multipath channel environments with affordable computational complexity.

Keywords

MIMO communication; OFDM modulation; antenna arrays; block codes; communication complexity; fast Fourier transforms; receiving antennas; space-time codes; transmitting antennas; MIMO; STBC-OFDM systems; computational complexity; multipath channel; multiple-input multiple-output channel; orthogonal frequency division multiplexing systems; preFFT combining; prefast Fourier transform; semidefinite relaxation; signal-to-noise ratio; space-time block-code; transmit-receive antennas; Computational complexity; Computational modeling; Diversity reception; Fourier transforms; MIMO; Multipath channels; OFDM; Receiving antennas; System performance; Transmitting antennas; Orthogonal frequency division multiplexing (OFDM); max-min fair criterion; multiple-input multiple-output (MIMO); pre-fast Fourier transform (pre-FFT) combining; space-time block code (STBC);

fLanguage

English

Publisher

ieee

Conference_Titel

Information, Communications and Signal Processing, 2009. ICICS 2009. 7th International Conference on

Conference_Location

Macau

Print_ISBN

978-1-4244-4656-8

Electronic_ISBN

978-1-4244-4657-5

Type

conf

DOI

10.1109/ICICS.2009.5397527

Filename

5397527