Iterative EM estimation based LDPC CDMA receiver

被引：0

作者：

Torrieri, Don ^{[1
]}

Mathur, Avinash ^{[2
]}

Mukherjee, Amitav ^{[2
]}

Kwon, Hyuck M. ^{[2
]}

机构：

[1] Army Res Lab, Adelphi, MD 20783 USA

[2] Wichita State Univ, Dept Elect & Comp Engn, Wichita, KS 67260 USA

来源：

2006 FORTIETH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS, VOLS 1-5 | 2006年

关键词：

EM Algorithm; iterative receiver; LDPC;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper proposes a scheme of iteratively obtaining an estimate of channel coefficient and noise power spectral density (PSD), initially with the aid of pilot symbols. The iterative receiver employs a low-density parity-check (LDPC) code and channel estimation based on expectation maximization. Pilot bits are distributed among subframes followed by spreading and binary phase-shift keying. At the receiver, an initial estimate of channel coefficient and noise PSD is obtained using pilot information. Subsequent values of channel coefficient and noise PSD are both iteratively updated by the soft feedback from the LDPC decoder. The updated channel coefficient and noise PSD are iteratively passed to the LDPC decoder, which results in an improved decoding accuracy, as shown.

引用

页码：2219 / +

页数：2