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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)
T h i s paper addresses the problem of space-frequency code design for broadband multi-a n t e n n a 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 m a x i m u m diversity available in frequency selective MIMO fading channels. Thus,(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(More)
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