2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization

Yohei Kojima; Kazuaki Takeda; Fumiyuki Adachi

doi:10.1587/transcom.E92.B.2065

2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization

Yohei Kojima, Kazuaki Takeda, Fumiyuki Adachi

Research Organization of Electrical Communication (ROEC)

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.

Original language	English
Pages (from-to)	2065-2071
Number of pages	7
Journal	IEICE Transactions on Communications
Volume	E92-B
Issue number	6
DOIs	https://doi.org/10.1587/transcom.E92.B.2065
Publication status	Published - 2009 Jun

Keywords

Channel estimation
DS-CDMA
Frequency-domain equalization
MMSE

ASJC Scopus subject areas

Software
Computer Networks and Communications
Electrical and Electronic Engineering

Access to Document

10.1587/transcom.E92.B.2065

Fingerprint Dive into the research topics of '2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization'. Together they form a unique fingerprint.

Cite this

@article{4e18a937b0534bcc902ca08a765789d6,

title = "2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization",

abstract = "Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.",

keywords = "Channel estimation, DS-CDMA, Frequency-domain equalization, MMSE",

author = "Yohei Kojima and Kazuaki Takeda and Fumiyuki Adachi",

year = "2009",

month = jun,

doi = "10.1587/transcom.E92.B.2065",

language = "English",

volume = "E92-B",

pages = "2065--2071",

journal = "IEICE Transactions on Communications",

issn = "0916-8516",

publisher = "Maruzen Co., Ltd/Maruzen Kabushikikaisha",

number = "6",

}

TY - JOUR

T1 - 2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization

AU - Kojima, Yohei

AU - Takeda, Kazuaki

AU - Adachi, Fumiyuki

PY - 2009/6

Y1 - 2009/6

N2 - Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.

AB - Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.

KW - Channel estimation

KW - DS-CDMA

KW - Frequency-domain equalization

KW - MMSE

UR - http://www.scopus.com/inward/record.url?scp=77956561711&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77956561711&partnerID=8YFLogxK

U2 - 10.1587/transcom.E92.B.2065

DO - 10.1587/transcom.E92.B.2065

M3 - Article

AN - SCOPUS:77956561711

VL - E92-B

SP - 2065

EP - 2071

JO - IEICE Transactions on Communications

JF - IEICE Transactions on Communications

SN - 0916-8516

IS - 6

ER -