Comparison of RCPT HARQ throughput using OFDM, MC-CDMA and DS-CDMA with frequency-domain equalization

Author

Garg, D. ; Adachi, Fumiyuki

Author_Institution

Dept. of Electr. & Commun. Eng., Tohoku Univ.

fYear

2004

fDate

7-7 Sept. 2004

Firstpage

60

Lastpage

64

Abstract

OFDM, MC-CDMA and DS-CDMA are being researched vigorously as the prospective signaling technique for the next generation mobile communications systems, which is characterized by the broadband packet technology. With packet transmission, hybrid ARQ (HARQ) is inevitable for error control. HARQ with rate compatible punctured turbo (RCPT) codes is one of the promising techniques. Data rate equivalent to OFDM can be attained with MC-CDMA and DS-CDMA by assigning all the available orthogonal codes to the same user, resulting in what is commonly referred to as multicode MC-CDMA and multicode DS-CDMA. In this paper, we introduce RCPT HARQ to DS-CDMA with minimum mean square error frequency-domain equalization (MMSE-FDE) and compare its throughput performance with OFDM, multicode MC-CDMA and multicode DS-CDMA with rake combining. It is found that the throughput of DS-CDMA with MMSE-FDE is the same as or better than that of MC-CDMA. However, with higher level modulation, coded OFDM is better than either MC-CDMA or DS-CDMA

Keywords

OFDM modulation; automatic repeat request; broadband networks; code division multiple access; equalisers; least mean squares methods; mobile communication; spread spectrum communication; turbo codes; DS-CDMA; MC-CDMA; MMSE-FDE; OFDM; RCPT HARQ throughput; broadband packet technology; direct sequence code division multiple access; frequency-domain equalization; hybrid automatic repeat request; minimum mean square error; multicarrier-code division multiple access; next generation mobile communications system; orthogonal code; orthogonal frequency division multiplexing; packet transmission; rake combining; rate compatible punctured turbo code; turbo code; Automatic repeat request; Bit error rate; Error correction; Frequency; Mean square error methods; Mobile communication; Multiaccess communication; Multicarrier code division multiple access; OFDM; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications Systems, 2004. ICCS 2004. The Ninth International Conference on

Conference_Location

Singapore, China

Print_ISBN

0-7803-8549-7

Type

conf

DOI

10.1109/ICCS.2004.1359339

Filename

1359339