A Markov Decision Theoretic Approach to Pilot Allocation and Receive Antenna Selection

Stephen, Reuben George and Murthy, Chandra R and Coupechoux, Marceau (2013) A Markov Decision Theoretic Approach to Pilot Allocation and Receive Antenna Selection. In: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 12 (8). pp. 3813-3823.

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Abstract

This paper considers antenna selection (AS) at a receiver equipped with multiple antenna elements but only a single radio frequency chain for packet reception. As information about the channel state is acquired using training symbols (pilots), the receiver makes its AS decisions based on noisy channel estimates. Additional information that can be exploited for AS includes the time-correlation of the wireless channel and the results of the link-layer error checks upon receiving the data packets. In this scenario, the task of the receiver is to sequentially select (a) the pilot symbol allocation, i.e., how to distribute the available pilot symbols among the antenna elements, for channel estimation on each of the receive antennas; and (b) the antenna to be used for data packet reception. The goal is to maximize the expected throughput, based on the past history of allocation and selection decisions, and the corresponding noisy channel estimates and error check results. Since the channel state is only partially observed through the noisy pilots and the error checks, the joint problem of pilot allocation and AS is modeled as a partially observed Markov decision process (POMDP). The solution to the POMDP yields the policy that maximizes the long-term expected throughput. Using the Finite State Markov Chain (FSMC) model for the wireless channel, the performance of the POMDP solution is compared with that of other existing schemes, and it is illustrated through numerical evaluation that the POMDP solution significantly outperforms them.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copyright of this article is belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords:	Antenna selection; pilot allocation; POMDP; FSMC
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	02 Oct 2013 14:56
Last Modified:	02 Oct 2013 14:56
URI:	http://eprints.iisc.ac.in/id/eprint/47439

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