Publication:
Feedback Allocation For OFDMA Systems With Slow Frequency-domain Scheduling

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Authors
Ganapathy, Harish
Banerjee, Siddhartha
Dimitrov, Nedialko B.
Caramanis, Constantine
Subjects
Limited feedback
multi-user feedback allocation
throughput-optimal
uplink feedback
Random Vector Quantization
sub-modular functions
convex relaxations
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2012
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Abstract
We study the problem of allocating limited feedback resources across multiple users in an orthogonalfrequency- division-multiple-access downlink system with slow frequency-domain scheduling. Many flavors of slow frequency-domain scheduling (e.g., persistent scheduling, semi-persistent scheduling), that adapt user-sub-band assignments on a slower time-scale, are being considered in standards such as 3GPP Long- Term Evolution (LTE). In this paper, we develop a feedback allocation algorithm that operates in conjunction with any arbitrary slow frequency-domain scheduler with the goal of improving the throughput of the system. Given a user-sub-band assignment chosen by the scheduler, the feedback allocation algorithm involves solving a weighted sum-rate maximization at each (slow) scheduling instant. We first develop an optimal dynamic-programming-based algorithm to solve the feedback allocation problem with pseudo-polynomial complexity in the number of users and in the total feedback bit budget. We then propose two approximation algorithms with complexity further reduced, for scenarios where the problem exhibits additional structure.
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Article
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IEEE Transactions on Signal Processing, December, 2012
The article of record as published may be located at http://dx.doi.org/10.1109/TSP.2012.2218243
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Harish Ganapathy, Siddhartha Banerjee, Nedialko B. Dimitrov and Constantine Caramanis. Feedback Allocation For OFDMA Systems With Slow Frequency-domain Scheduling. IEEE Transactions on Signal Processing, December, 2012, doi:10.1109/TSP.2012.2218243
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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