NDLI: A Subcarrier Allocation Scheme for MC-DS-CDMA Systems in the Presence of Multiple Access Interference

Content Provider	IEEE Xplore Digital Library
Author	Hai Long Yong Huat Chew Kainan Zhou
Copyright Year	2008
Description	Author affiliation: Agency for Sci., Technol. & Res. (A*STAR), Singapore (Hai Long; Yong Huat Chew; Kainan Zhou)
Abstract	Subcarrier allocation for multiuser MC-DS-CDMA systems is much more complicated when compared to OFDM systems due to the presence of multiple access interference (MAI) when multiple users transmit simultaneously on the same subcarrier. In this paper, we propose a novel suboptimal algorithm to adaptively allocate subcarriers for MC-DS-CDMA systems, with the effect of MAI taken into consideration. An earlier proposed algorithm minimizes the bit- error-rate (BER) of respective users rather than minimizes the overall system BER. Each user performs channel estimation, orders subcarrier channel gains and feedbacks an index vector to the base station (BS). BS uses these index vectors from all the users, together with subcarrier allocation coefficients of the previous updating stage, to adaptively generate subcarrier allocation coefficients of the current updating stage so that BER performance is optimized. However, since the assignment process depends on the earlier allocation coefficients of other users, an error can propagate and affect the decision to be made in the next stage. In the proposed approach, the problem is formulated using Quadratic Programming (QP), and a single objective function is used to optimize the overall system BER. The algorithm uses the actual values of channel gains and does not depend on any information from the previous updating stage. Thus, the discrepancy propagation is avoided. We use Kuhn-Tucker conditions to convert the formulated QP to a linear programming (LP) problem, and the solution can be obtained using standard LP solvers.
Starting Page	958
Ending Page	963
File Size	185097
Page Count	6
File Format	PDF
ISBN	9781424419975
ISSN	15253511
DOI	10.1109/WCNC.2008.174
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-03-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Multiple access interference Bit error rate Quadratic programming Feedback Linear programming OFDM Communications Society Vectors Channel estimation Performance gain
Content Type	Text
Resource Type	Article

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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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An adaptive subcarrier allocation scheme for MC-DS-CDMA systems in the presence of multiple access interference

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