Throughput Analysis of Best-m Feedback in OFDM Systems with Uniformly Correlated Subchannels

Ananya, SN and Mehta, Neelesh B (2015) Throughput Analysis of Best-m Feedback in OFDM Systems with Uniformly Correlated Subchannels. In: UNSPECIFIED, FEB 28-MAR 02, 2014, Kanpur, INDIA.

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Abstract

Practical orthogonal frequency division multiplexing (OFDM) systems, such as Long Term Evolution (LTE), exploit multi-user diversity using very limited feedback. The best-m feedback scheme is one such limited feedback scheme, in which users report only the gains of their m best subchannels (SCs) and their indices. While the scheme has been extensively studied and adopted in standards such as LTE, an analysis of its throughput for the practically important case in which the SCs are correlated has received less attention. We derive new closed-form expressions for the throughput when the SC gains of a user are uniformly correlated. We analyze the performance of the greedy but unfair frequency-domain scheduler and the fair round-robin scheduler for the general case in which the users see statistically non-identical SCs. An asymptotic analysis is then developed to gain further insights. The analysis and extensive numerical results bring out how correlation reduces throughput.

Item Type:	Conference Proceedings
Series.:	National Conference on Communications NCC
Publisher:	IEEE
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Keywords:	Orthogonal frequency division multiplexing (OFDM); Correlation; Channel quality feedback; Best-m; Frequency-domain scheduling; Adaptive modulation and coding
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	19 Jul 2015 09:30
Last Modified:	19 Jul 2015 09:30
URI:	http://eprints.iisc.ac.in/id/eprint/51851

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