Programmable multiuser synchronization for OFDM-CDMA

Author

Wu, Shan-Tsung ; Chen, Kwang-Cheng

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

2

fYear

2001

fDate

2001

Firstpage

830

Abstract

A more effective synchronization is required for multiuser detection because of its high sensitivity to estimation errors of timings, carrier phases, and amplitudes. From the multiuser synchronization approach proposed in Chang et al., (2000), we develop a linear-complexity programmable multiuser synchronization structure for OFDM-CDMA in a multiray fading channel. Based on LMMSE and BLUE, we develop joint estimation of timings, carrier phases, and amplitudes. The structure can be programmed to various OFDM-CDMA by adjusting system parameters and its performance is also verified by simulations. An algorithm is further proposed to avoid irrelevant calculations of FFT. The proposed structure is valuable and desirable for its programmability and near-far resistance

Keywords

OFDM modulation; amplitude estimation; code division multiple access; fading channels; fast Fourier transforms; interference suppression; least mean squares methods; multiuser channels; phase estimation; synchronisation; BLUE; FFT; LMMSE; OFDM-CDMA; amplitude estimation; carrier phase estimation; linear complexity; multiray fading channel; multiuser detection; near-far resistance; programmable multiuser synchronization; timing estimation; Amplitude estimation; Equalizers; Estimation error; Fading; Frequency synchronization; Multiaccess communication; Multiple access interference; Multiuser detection; OFDM; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd

Conference_Location

Rhodes

ISSN

1090-3038

Print_ISBN

0-7803-6728-6

Type

conf

DOI

10.1109/VETECS.2001.944495

Filename

944495