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Introduction to CPM-SC-FDMA: A Novel Multiple-Access Power-Efficient Transmission Scheme | IEEE Journals & Magazine | IEEE Xplore

Introduction to CPM-SC-FDMA: A Novel Multiple-Access Power-Efficient Transmission Scheme


Abstract:

This paper presents a novel multiple-access modulation scheme which combines key characteristics of single carrier frequency division multiple access (SC-FDMA) with conti...Show More

Abstract:

This paper presents a novel multiple-access modulation scheme which combines key characteristics of single carrier frequency division multiple access (SC-FDMA) with continuous phase modulation (CPM) in order to generate a power efficient waveform. CPM-SC-FDMA is developed based upon the observation that the samples from a CPM waveform may be treated as "data symbols" taken from a constant-envelope encoder. As with any encoder output, these samples may be precoded using the Discrete Fourier Transform and transmitted using SC-FDMA. Having originated from a constant envelope CPM waveform, CPM-SC-FDMA can potentially retain much of the power efficiency of CPM-thus resulting in a lower peak-to-average power ratio (PAPR) than conventional SC-FDMA. In this paper, we account for the information rate, memory, power efficiency, bit error rate (BER) performance and spectral occupancy of CPM-SC-FDMA. In addition, we investigate the impact of amplifier nonlinearity on BER performance as the number of users increases. Finally, we provide a detailed numerical comparison with a commensurate convolutionally coded QPSK-SC-FDMA scheme (CC-QPSK-SC-FDMA). We show a CPM-SC-FDMA scheme that provides an overall gain of up to 4 dB relative to the CC-QPSK-SC-FDMA scheme over a frequency-selective channel.
Published in: IEEE Transactions on Communications ( Volume: 59, Issue: 7, July 2011)
Page(s): 1904 - 1915
Date of Publication: 14 July 2011

ISSN Information:


I Introduction

Orthogonal frequency division multiplexing (OFDM) has grown in popularity to become the modulation of choice for many high data-rate communication systems. The spectral efficiency of OFDM is based on the observation that the orthogonality of subcarriers provides a way to pack more subchannels into the same channel spectrum in order to accommodate multiple users [1], [2]. In OFDM, the subcarriers are generated using the computationally-efficient inverse discrete Fourier transform (IDFT) and can thus exploit the well-known circular convolution properties of the DFT in order to implement low-complexity frequency-domain equalization techniques. Despite its many advantages, however, OFDM has the disadvantage of having large fluctuations in its signal amplitude, which gives it a high peak-to-average-power ratio (PAPR).

References

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