NDLI: Optimum joint detection using soft decision combined with maximum gradient search

Content Provider	IEEE Xplore Digital Library
Author	Al Murrani, K.
Copyright Year	2009
Description	Author affiliation: Department of Electrical and Electronic, Engineering, The University of Nottingham, Malaysia Campus Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia (Al Murrani, K.)
Abstract	The number of computations required by the optimum maximum likelihood receiver to make a decision on the received signal vector grows exponentially with the number of users in a multiuser CDMA environment which makes it too complex to implement practically. In this paper we suggest a modification in the approach of this receiver to arrive at the maximum likelihood decision. Instead of comparing the received vector for all possible combinations of the transmitted data vector, we use the gradient method to scale the surface of the decision metric in the direction of the optimum maximizing point. Combining this with soft decision by restricting the movement by one dimension at a time after making a decision along the respective axis, we can arrive at the maximum likelihood decision with a number of computations that increases quadratically rather than exponentially with the number of users. Results show that the performance of the optimum receiver using this approach is virtually indistinguishable from the standard computationally intensive approach.
Starting Page	638
Ending Page	641
File Size	306172
Page Count	4
File Format	PDF
ISBN	9781424435845
DOI	10.1109/ISWCS.2009.5285221
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-07
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Maximum likelihood detection Gradient methods Viterbi algorithm Bit error rate Multiple access interference Iterative algorithms Correlators Decorrelation Multiaccess communication Maximum likelihood decoding
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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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