Vijay Ahirwar

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It is known that in an OFDM system using Hadamard transform or phase alteration before the IDFT operation can reduce the peak-to-average power ratio (PAPR). Both these techniques can be viewed as constellation preceding for PAPR reduction. In general, using non-diagonal transforms, like Hadamard transform, increases the ML decoding complexity. In this paper(More)
This paper addresses the problem of space-frequency code design for broadband multian t enna OFDM systems. We show that space-time codes achieving full diversity in quasi-static flat fading environment can be used to construct space-frequency codes that achieve the max imum diversity available in frequency selective MIMO fading channels. Thus, the abundant(More)
It is known that in an OFDM system using Hadamard transform or phase alteration before the IDFT operation can reduce the Peak-to-Average Power Ratio (PAPR). Both these techniques can be viewed as constellation precoding for PAPR reduction. In general, using non-diagonal transforms, like Hadamard transform, increases the ML decoding complexity. In this paper(More)
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