Joint Antenna Selection and Frequency-Domain Scheduling in OFDMA Systems with Imperfect Estimates from Dual Pilot Training Scheme

Kashyap, Salil and Mehta, Neelesh B (2013) Joint Antenna Selection and Frequency-Domain Scheduling in OFDMA Systems with Imperfect Estimates from Dual Pilot Training Scheme. In: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 12 (7). pp. 3473-3483.

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Abstract

Transmit antenna selection (AS) has been adopted in contemporary wideband wireless standards such as Long Term Evolution (LTE). We analyze a comprehensive new model for AS that captures several key features about its operation in wideband orthogonal frequency division multiple access (OFDMA) systems. These include the use of channel-aware frequency-domain scheduling (FDS) in conjunction with AS, the hardware constraint that a user must transmit using the same antenna over all its assigned subcarriers, and the scheduling constraint that the subcarriers assigned to a user must be contiguous. The model also captures the novel dual pilot training scheme that is used in LTE, in which a coarse system bandwidth-wide sounding reference signal is used to acquire relatively noisy channel state information (CSI) for AS and FDS, and a dense narrow-band demodulation reference signal is used to acquire accurate CSI for data demodulation. We analyze the symbol error probability when AS is done in conjunction with the channel-unaware, but fair, round-robin scheduling and with channel-aware greedy FDS. Our results quantify how effective joint AS-FDS is in dispersive environments, the interactions between the above features, and the ability of the user to lower SRS power with minimal performance degradation.

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; fading channels; OFDMA; scheduling; symbol error probability; diversity techniques; multiple antennas; imperfect channel knowledge
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	02 Oct 2013 06:05
Last Modified:	02 Oct 2013 06:05
URI:	http://eprints.iisc.ac.in/id/eprint/47364

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