Reply to the comments on "Reduction of peak-to-average power ratio of OFDM system using a companding technique"

Wang, Xianbin; Tjhung, Tjeng Thiang; Ng, Chun Sum

doi:10.1109/11.825538

Cited by 29 publications

(2 citation statements)

References 6 publications

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“…In this paper, the performance of the companded signal is compared to that of an uncompanded signal of equal power, based on the analyses Mattsson et al [17] and Wang et al [18]. It should be recalled that companding the OFDM signal effectively increases its signal strength [7].…”

Section: Modified µ-Law Compandingmentioning

confidence: 99%

“…It should be recalled that companding the OFDM signal effectively increases its signal strength [7]. Therefore, we include a normalization constant K such that E s = E s c (the symbol energy of the uncompanded signal is equal to the symbol energy of the companded signal), and the companding equation at the transmitter is redefined as [18]:…”

Section: Modified µ-Law Compandingmentioning

confidence: 99%

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On Optimizing the PAPR of OFDM Signals With Coding, Companding, and MIMO

2019

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One main disadvantage of the multiple-input-multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) system is that the signals transmitted on each antenna may experience high peak-to-average-power ratio (PAPR). We will present a new hybrid PAPR reduction technique that combines and optimizes three methods, namely convolutional code, successive suboptimal cross-antenna rotation and inversion (SS-CARI), and iterative modified companding and filtering. The results for the hybrid PAPR reduction technique show that this scheme significantly reduces the PAPR compared with SS-CARI alone; it can improve the bit error rate to levels better than what obtains with the space-time block coding MIMO-OFDM system, and the spectral splatter due to companding is also controlled by the use of frequencydomain filtering. In addition, it is a flexible technique in which the net gain can be optimized based on the requirements of scheme parameters, such as the code rate, the constraint length of the convolutional code, the number of subblocks for SS-CARI, and the companding parameters. INDEX TERMS Companding, convolutional codes, multiple-input multiple-output (MIMO), orthogonal frequency division multiplexing (OFDM), peak-to-average power ratio (PAPR), signal scrambling, space-time block coding (STBC).

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Section: Modified µ-Law Compandingmentioning

confidence: 99%

Section: Modified µ-Law Compandingmentioning

confidence: 99%