NDLI: Packet access using DS-CDMA with frequency-domain equalization

Content Provider	IEEE Xplore Digital Library
Author	Garg, D. Adachi, F.
Copyright Year	1983
Abstract	The next-generation mobile communications system is anticipated to support very high-speed data rates exceeding several tens megabits per second. In this paper, we consider high-speed downlink packet access for direct-sequence code-division multiple access (DS-CDMA) as in third-generation wideband code-division multiple-access systems. Adaptive modulation and coding (AMC), multicode operation and hybrid automatic repeat request (HARQ) will be the enabling technologies. With such high-speed data transmissions, however, multicode operation severely suffers from the loss of orthogonality among the spreading codes since the wireless channel becomes severely frequency-selective. In this paper, we apply frequency-domain equalization (FDE) based on minimum mean-square error (MMSE) criterion instead of conventional rake combining for receiving the packet. A new MMSE-FDE weight is derived for packet combining. The throughput in a frequency-selective Rayleigh-fading channel is evaluated by computer simulation for Chase combining and incremental redundancy (IR) packet combining. It is shown that the use of MMSE-FDE for the reception of multicode DS-CDMA packet gives an improved throughput irrespective of the channel's frequency-selectivity.
Starting Page	161
Ending Page	170
Page Count	10
File Size	467102
File Format	PDF
ISSN	07338716
Volume Number	24
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiaccess communication Frequency Throughput Mobile communication Downlink Direct-sequence code-division multiple access Wideband Adaptive systems Modulation coding Automatic repeat request multicode Adaptive modulation coding (AMC) automatic repeat request direct-sequence code-division multiple access (DS-CDMA) equalizers error correction coding hybrid automatic repeat request (HARQ) high-speed downlink packet access (HSDPA) minimum mean-square error frequency-domain equalization (MMSE-FDE) mobile communication
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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