Square complex orthogonal designs with low PAPR

Das, Smarajit ; Sundar Rajan, B. (2007) Square complex orthogonal designs with low PAPR In: IEEE International Symposium on Information Theory, 2007, ISIT 2007, 24-29 June, 2007, Nice, France.

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Official URL: http://ieeexplore.ieee.org/document/4557181/

Related URL: http://dx.doi.org/10.1109/ISIT.2007.4557181


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 resulting in high Peak to Average of 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, maximal-rate SCODs with no zero entry have been reported for 8 transmit antennas, constructed using Amicable Orthogonal Designs. In this paper, maximal-rate SCODs with no zero entry for 2a 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 2a times 2a maximal-rate SCODs with the fraction of number of zero entries to the total number of entries equal to [1-(a-1)/( 2a)] 2[log2(2 a /a+1)] is reported. Moreover, it is shown that these codes are obtainable by premultiplying the well known SCODs with appropriate scaled unitary matrices consisting of nonzero entries that are plusmn1 only. A procedure to compute these scaled unitary matrices is also presented.

Item Type:Conference or Workshop Item (Paper)
Source:Copyright of this article belongs to Institute of Electrical and Electronics Engineers.
ID Code:111151
Deposited On:08 Dec 2017 10:29
Last Modified:08 Dec 2017 10:29

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