3 research outputs found
Time-frequency warped waveforms for well-contained massive machine type communications
This paper proposes a novel time-frequency warped waveform for short symbols, massive machine-type communication (mMTC), and internet of things (IoT) applications. The waveform is composed of asymmetric raised cosine (RC) pulses to increase the signal containment in time and frequency domains. The waveform has low power tails in the time domain, hence better performance in the presence of delay spread and time offsets. The time-axis warping unitary transform is applied to control the waveform occupancy in time-frequency space and to compensate for the usage of high roll-off factor pulses at the symbol edges. The paper explains a step-by-step analysis for determining the roll-off factors profile and the warping functions. Gains are presented over the conventional Zero-tail Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (ZT-DFT-s-OFDM), and Cyclic prefix (CP) DFT-s-OFDM schemes in the simulations section.United States Department of Energy (DOE) ; Office of Advanced Scientific Computing Research ; National Science Foundation (NSF
Time-Frequency Warped Waveforms for Well-Contained Massive Machine Type Communications
This paper proposes a novel time-frequency warped waveform for short symbols,
massive machine-type communication (mMTC), and internet of things (IoT)
applications. The waveform is composed of asymmetric raised cosine (RC) pulses
to increase the signal containment in time and frequency domains. The waveform
has low power tails in the time domain, hence better performance in the
presence of delay spread and time offsets. The time-axis warping unitary
transform is applied to control the waveform occupancy in time-frequency space
and to compensate for the usage of high roll-off factor pulses at the symbol
edges. The paper explains a step-by-step analysis for determining the roll-off
factors profile and the warping functions. Gains are presented over the
conventional Zero-tail Discrete Fourier Transform-spread-Orthogonal Frequency
Division Multiplexing (ZT-DFT-s-OFDM), and Cyclic prefix (CP) DFT-s-OFDM
schemes in the simulations section.Comment: This paper has been accepted by IEEE JSAC special issue on 3GPP
Technologies: 5G-Advanced and Beyond. Copyright may be transferred without
notice, after which this version may no longer be accessibl
Zero Tail Filter Bank Spread OFDM
Waveforms proposed for future communication systems aim at fulfilling the demanding requirements of the next generation of 5G applications. In this paper, an enhancement over Zero Tail Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (ZT DFT-S-OFDM) is proposed. The presented Zero Tail Filter Bank Spread OFDM (ZT FB-S-OFDM) replaces the discrete Fourier transform (DFT) block with a filter bank (FB) block. The performance of the conventional system is degraded due to the non-perfect zero-tails. The proposed system suppresses the power over the zero-tails by using raised cosine (RC) shaped pulses near the zero-tails. An implementation scheme for the transmitter and the receiver is proposed. It is shown that suppressing the power over the zero-tail enhances the system bit error rate (BER) performance. Furthermore, results show extra improvements in the peak-to-average power ratio (PAPR) and out-of-band emission (OOBE) performances.IEEEAFCEAIEEE Communications Societ