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Square Complex Orthogonal Designs with Low PAPR and Signaling Complexity

Das, Smarajit and Rajan, B Sundar (2009) Square Complex Orthogonal Designs with Low PAPR and Signaling Complexity. In: IEEE Transactions on Wireless Communications, 8 (1). pp. 204-213.

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Space-Time Block Codes from square complex orthogonal designs (SCOD) have been extensively studied and most of the existing SCODs contain large number of zero. The zeros in the designs result in high peak-to-average power ratio (PAPR) and also impose a severe constraint on hardware implementation of the code when turning off some of the transmitting antennas whenever a zero is transmitted. Recently, rate 1/2 SCODs with no zero entry have been reported for 8 transmit antennas. In this paper, SCODs with no zero entry for 2(a) transmit antennas whenever a + 1 is a power of 2, are constructed which includes the 8 transmit antennas case as a special case. More generally, for arbitrary values of a, explicit construction of 2(a) x 2(a) rate a+1/2(a) SCODs with the ratio of number of zero entries to the total number of entries equal to 1 - a+1/2(a) 2(left perpendicular log2(2a/a+1) right perpendicular) is reported, whereas for standard known constructions, the ratio is 1 - a+1/2(a). The codes presented do not result in increased signaling complexity. Simulation results show that the codes constructed in this paper outperform the codes using the standard construction under peak power constraint while performing the same under average power constraint.

Item Type: Journal Article
Publication: IEEE Transactions on Wireless Communications
Publisher: IEEE
Additional Information: Copyright 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Amicable orthogonal designs;MIMO;orthogonal designs;PAPR;space-time codes;transmit diversity.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 05 Nov 2009 07:39
Last Modified: 19 Sep 2010 05:25
URI: http://eprints.iisc.ac.in/id/eprint/18831

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