An OFDM transmission scheme using variable-length groupwise orthogonal code multiplexing

Author

Oh, Seong Keun ; Kwon, Ki Bum ; Sunwoo, Myung Hoon

Author_Institution

Sch. of Electr. & Comput. Eng., Ajou Univ., Suwon, South Korea

Volume

4

fYear

2003

fDate

6-9 Oct. 2003

Firstpage

2457

Abstract

This paper proposes a novel orthogonal frequency division multiplexing (OFDM) transmission scheme using variable-length groupwise (VLG) orthogonal code multiplexing (OCM). It reduces significantly the complexity for multiplexing and demultiplexing with just a little sacrifice in the performance as compared with the ordinary OCM scheme (S.K. Oh et al., (2003)). In the proposed scheme, all the subcarriers are divided into multiple subcarrier groups, in which each group is composed of only relatively less correlated subcarriers. The scheme then transmits modulation symbols through two-step interleaving and groupwise OCM. As a proper set of VLG orthogonal codes, and use the set of discrete Fourier transform (DFT) codes. Also consider the coded and uncoded VLG-OCM OFDM systems. Finally, evaluate the bit error rate (BER) performance and the complexity according to the OCM code length.

Keywords

OFDM modulation; channel coding; discrete Fourier transforms; error statistics; fading channels; transform coding; variable length codes; BER; DFT; OCM; OFDM transmission scheme; VLG; bit error rate; code demultiplexing; discrete Fourier transform code; multiple subcarrier group; orthogonal code multiplexing; orthogonal frequency division multiplexing; variable-length groupwise; Bit error rate; Demultiplexing; Discrete Fourier transforms; Fading; Frequency conversion; Frequency diversity; Frequency division multiplexing; Interleaved codes; OFDM modulation; Peak to average power ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th

ISSN

1090-3038

Print_ISBN

0-7803-7954-3

Type

conf

DOI

10.1109/VETECF.2003.1285975

Filename

1285975