Distributed DFT-Spread OFDM

Author

Chia, Meng Wah ; Thian, Boon Sim ; Tjhung, Tjeng Thiang

Author_Institution

Inst. for Infocomm Res.

fYear

2006

fDate

Oct. 2006

Firstpage

1

Lastpage

5

Abstract

In this paper, we develop a signal model for the transmission of discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-SOFDM) in a frequency selective channel. Although maximum likelihood (ML) estimation of the transmitted signal in the DFT-SOFDM system gives the optimum bit-error rate (BER) performance, it incurs exponential complexity due to its exhaustive search implementation. However, our signal model allows the use of sphere decoding algorithm (SDA) which significantly reduces the complexity of ML estimation. Computer simulation of an DFT-SOFDM system at signal-to-noise ratio (SNR) of 5 dB demonstrates that the SDA searches 39 points compared to 216 in the original ML implementation

Keywords

OFDM modulation; channel coding; decoding; discrete Fourier transforms; error statistics; maximum likelihood estimation; BER; SDA; bit-error rate; discrete Fourier transform; distributed DFT-spread OFDM; frequency selective channel; maximum likelihood estimation; orthogonal frequency division multiplexing; sphere decoding algorithm; Bit error rate; Discrete Fourier transforms; Fading; Frequency diversity; Frequency division multiaccess; Frequency domain analysis; Maximum likelihood decoding; Maximum likelihood estimation; OFDM; Performance gain;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication systems, 2006. ICCS 2006. 10th IEEE Singapore International Conference on

Conference_Location

Singapore

Print_ISBN

1-4244-0411-8

Electronic_ISBN

1-4244-0411-8

Type

conf

DOI

10.1109/ICCS.2006.301427

Filename

4085722