Iterative CDMA Receiver with EM Channel Estimation and Turbo Decoding

Author

Torrieri, Don ; Ustunel, E. ; Seunghyun Min ; Dong H Kang

Author_Institution

Army Res. Lab., Adelphi, MD

fYear

2006

fDate

23-25 Oct. 2006

Firstpage

1

Lastpage

6

Abstract

This paper presents an efficient iterative code-division multiple-access direct-sequence system that uses a turbo code and requires few pilot symbols for carrier estimation and tracking. The signal strength and the noise-power spectral density are separately estimated by applying the expectation maximization (EM) algorithm. The higher throughput of the proposed system relative to a conventional 3 ^rd Generation Partnership Project system is verified through simulations using a Jakes fading environment. The complexity of the proposed EM iterative parameter-estimation scheme is low because the required number of complex multiplications is equal to only four times the fading block size

Keywords

channel coding; channel estimation; code division multiple access; expectation-maximisation algorithm; fading channels; iterative decoding; radio receivers; spread spectrum communication; tracking; turbo codes; EM algorithm; EM channel estimation; Jakes fading environment; code-division multiple-access direct-sequence system; expectation maximization algorithm; fading block; iterative CDMA receiver; noise-power spectral density; parameter-estimation scheme; pilot symbols; tracking; turbo decoding; Amplitude estimation; Binary phase shift keying; Bit error rate; Channel estimation; Fading; Iterative algorithms; Iterative decoding; Maximum likelihood estimation; Multiaccess communication; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Military Communications Conference, 2006. MILCOM 2006. IEEE

Conference_Location

Washington, DC

Print_ISBN

1-4244-0617-X

Electronic_ISBN

1-4244-0618-8

Type

conf

DOI

10.1109/MILCOM.2006.302174

Filename

4086800