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Low PAPR Square STBCs from Complex Partial-Orthogonal Designs (CPODs)

Kumar, Gopu VR Muni and Rajan, B Sundar (2009) Low PAPR Square STBCs from Complex Partial-Orthogonal Designs (CPODs). In: IEEE Global Telecommunications Conference, NOV 26-30, 2007, Washington, DC, pp. 2369-2378.

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Abstract

Space-time codes from complex orthogonal designs (CODs) with no zero entries offer low Peak to Average Power Ratio (PAPR) and avoid the problem of switching off antennas. But square CODs for 2(a) antennas with a + 1. complex variables, with no zero entries were discovered only for a <= 3 and if a + 1 = 2(k), for k >= 4. In this paper, a method of obtaining no zero entry (NZE) square designs, called Complex Partial-Orthogonal Designs (CPODs), for 2(a+1) antennas whenever a certain type of NZE code exists for 2(a) antennas is presented. Then, starting from a so constructed NZE CPOD for n = 2(a+1) antennas, a construction procedure is given to obtain NZE CPODs for 2n antennas, successively. Compared to the CODs, CPODs have slightly more ML decoding complexity for rectangular QAM constellations and the same ML decoding complexity for other complex constellations. Using the recently constructed NZE CODs for 8 antennas our method leads to NZE CPODs for 16 antennas. The class of CPODs do not offer full-diversity for all complex constellations. For the NZE CPODs presented in the paper, conditions on the signal sets which will guarantee full-diversity are identified. Simulation results show that bit error performance of our codes is same as that of the CODs under average power constraint and superior to CODs under peak power constraint.

Item Type: Conference Paper
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: Complex Orthogonal Designs (COD); Complex Partial-Orthogonal Designs (CPODs); Maximum Likelihood (ML) decoding;Peak-to-Average Power Ratio (PAPR);space-time block codes;transmit diversity.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 28 Aug 2009 15:55
Last Modified: 19 Sep 2010 05:33
URI: http://eprints.iisc.ernet.in/id/eprint/20566

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