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 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

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10.1587/transcom.E92.B.2065

Cite this

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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.",

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AU - Takeda, Kazuaki

AU - Adachi, Fumiyuki

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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.

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

Abstract

Keywords

ASJC Scopus subject areas

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