Two-stage maximum likelihood estimation (TSMLE) for MT-CDMA signals

Author

Rahman, Quasi Mehbubar ; Sesay, Abu B.

Author_Institution

Dept. of Electr. & Comput. Eng., Calgary Univ., Alta., Canada

Volume

1

fYear

2001

fDate

2001

Firstpage

111

Abstract

This paper proposes a new type of receiver for MT-CDMA signals, which is based on the two-stage maximum likelihood estimation (TSMLE). The first stage of the TSMLE performs the channel estimation considering either the received symbol or the estimate of the received symbol is known while the second stage uses this estimated channel information to estimate the next symbol. The performance of this receiver is investigated in terms of the bit error rate (BER) for a multipath, slowly Rayleigh fading channel in the indoor environment. The multiple access interference (MAI) is taken into account. A model for the computation of average bit error probability is derived for quadrature phase shift keying (QPSK) modulation. The influence of number of tones is studied for given bandwidth (BW), bit rate and transmission power

Keywords

OFDM modulation; Rayleigh channels; code division multiple access; error statistics; indoor radio; maximum likelihood estimation; multipath channels; multiuser channels; quadrature phase shift keying; radio receivers; radiofrequency interference; spread spectrum communication; BER; DS-SS; MT-CDMA signals; OFDM; QPSK; TSMLE; average bit error probability; bandwidth; bit error rate; bit rate; channel estimation; direct sequence spread spectrum; estimated channel information; indoor environment; multipath; multiple access interference; orthogonal frequency division multiplexing; quadrature phase shift keying; received symbol; received symbol estimate; receiver performance; slowly Rayleigh fading channel; transmission power; two-stage MLSE; two-stage maximum likelihood estimation; Bit error rate; Channel estimation; Computational modeling; Error probability; Fading; Indoor environments; Maximum likelihood estimation; Multiple access interference; Phase modulation; Quadrature phase shift keying;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering, 2001. Canadian Conference on

Conference_Location

Toronto, Ont.

ISSN

0840-7789

Print_ISBN

0-7803-6715-4

Type

conf

DOI

10.1109/CCECE.2001.933668

Filename

933668