Energy spreading transform for down-link MC-CDMA

Author

Hwang, Taewon ; Li, Ye Geoffrey ; Yuan-Wu, Yi

Author_Institution

Sch. of Electr. & Electron. Eng., Yonsei Univ., Seoul

Volume

7

Issue

5

fYear

2008

fDate

5/1/2008 12:00:00 AM

Firstpage

1522

Lastpage

1526

Abstract

In this paper, we apply recently developed energy spreading transform (EST) technique to down-link MC-CDMA systems for frequency and spatial diversity. The performance of the proposed EST based MC-CDMA systems is independent of the number of active users, which is different from all current MC-CDMA systems. It is demonstrated by computer simulation that the BER for the EST based system is 1.1 times 110^-4 while it is 1.6 times 10^-3 for a MC-CDMA system without EST when the system is with full load and E_b/N_o = 12 dB. The EST based MC-CDMA system also facilitates transmit diversity and MIMO techniques when multiple transmit and receive antennas are available. In particular, we develop symbol shuffle and combined schemes for spatial diversity for a EST based MC-CDMA system with multiple transmit antennas at the base station. Compared with a MC-CDMA system without EST, the required E_b/N_o for 1% BER for the developed scheme is improved by about 4 dB.

Keywords

MIMO systems; antenna arrays; code division multiple access; diversity reception; error statistics; receiving antennas; transforms; transmitting antennas; MIMO technique; down-link MC-CDMA; energy spreading transform technique; error statistics; frequency-spatial diversity; multicarrier code division multiple access; multiple transmit-receive antenna; symbol shuffling; Bit error rate; Data communication; Fading; Intersymbol interference; MIMO; Multiaccess communication; Multicarrier code division multiple access; Multipath channels; OFDM; Telecommunications;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2008.061092

Filename

4524311