Abstract
Polynomial-cancellation-coded orthogonal frequency division multiplexing (PCC-OFDM) is a form of OFDM that has waveforms which are very well localized in both the time and frequency domains and so it is ideally suited for use in the 5G network. This paper analyzes the performance of PCC-OFDM in the uplink of a multiuser system using orthogonal frequency division multiple access (OFDMA) and compares it with conventional cyclic prefix OFDM (CP-OFDM), and universal filtered multicarrier (UFMC). PCC-OFDM is shown to be very much less sensitive to time and frequency offsets than either CP-OFDM or UFMC. For a given constellation size, PCC-OFDM in additive white Gaussian noise (AWGN) requires 3 dB lower signal-to-noise ratio (SNR) for a given bit-error-rate, and the SNR advantage of PCC-OFDM increases rapidly when there are timing and/or frequency offsets. For PCC-OFDM no frequency guard-band is required between different OFDMA users. PCC-OFDM is completely compatible with CP-OFDM and adds negligible complexity and latency, because it uses a simple mapping of data onto pairs of subcarriers at the transmitter, and a simple weighting-and-adding of pairs of subcarriers at the receiver. The weighting-and-adding step, which has been omitted in some of the literature, is shown to contribute substantially to the SNR advantage of PCC-OFDM. A disadvantage of PCC-OFDM (without overlapping) is the potential reduction in spectral efficiency because subcarriers are modulated in pairs, but this reduction is more than regained because no guard band is required and because, for a given channel, larger constellations can be used.
Highlights
The design of the 5G mobile network presents many new challenges not faced by earlier generations of mobile access technology
CONTRIBUTIONS, NOVELTY AND SIGNIFICANCE In this paper, we present a study of the performance of PCC-Orthogonal frequency division multiplexing (OFDM) in the context of multiuser uplink communications for 5G
PERFORMANCE OF cyclic prefix OFDM (CP-OFDM), PCC-OFDM AND universal filtered multicarrier (UFMC) - SINGLE-USER CASE We show how the different properties of the three waveforms affect their sensitivity to timing and frequency offsets and to noise in a single-user scenario, and demonstrate the importance of the receiver weighting-and-adding operation in the PCC-OFDM receiver
Summary
The design of the 5G mobile network presents many new challenges not faced by earlier generations of mobile access technology. The simplest form of PCC-OFDM involves mapping data to adjacent pairs of subcarriers This results in substantial cancellation of the frequency domain sidelobes, and a form of windowing in the time domain.. These results show the important contribution of receiver processing to the robustness of PCC-OFDM in the presence of timing and frequency offsets This is essential to understanding why this work reaches different conclusions from earlier research [36], [37]. 3) The first study of a multiuser OFDMA system using PCC-OFDM that considers frequency offsets, and the combination of timing and frequency offsets This is an important factor in an mMTC environment, where strict synchronization is not practicable. 4) Detailed simulation results for the performance of PCC-OFDM in a multiuser context These include results for much larger time and frequency offsets than have been considered in single-user OFDM.
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