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Efficient Fast-Convolution Based Hybrid Carried System
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DOI：10.1109/TWC.2021.3122880.png)
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Abstract
En 中文
The weighted-type fractional Fourier transform (WFRFT)-based hybrid carrier (HC) system has been proposed to bridge the gap between orthogonal frequency division multiplexing (OFDM) system and single-carrier system with frequency domain equalization (SC-FDE). In this paper, we propose a novel HC system based on efficient fast-convolution (FC) without a cyclic prefix to meet the requirements of complex scenarios towards future communications. The proposed system can achieve flexible optimization of system performance, such as minimizing out-of-band emission (OOBE), peak to average power ratio (PAPR) and bit error rate (BER). This efficient FC based hybrid carrier (FCHC) system is among the most competitive waveforms. The closed-form BER expressions are derived and analyzed over additive white Gaussian noise (AWGN) and frequency-selective fading channels. A modified equalizer over frequency-selective channels is also provided to resist the inter-block interference (IBI). Moreover, the banded minimum mean-square error (MMSE) equalization based on FC can be embedded in the proposed system over doubly-selective channels, and then the interference caused by fading channels can be further suppressed through the combination of FC and HC. The simulation results demonstrate the superiority of the proposed system over the conventional HC system in terms of OOBE, PAPR and BER. The significant flexibility and combined performance advantages make the proposed system a potential scheme for future communications.
Keywords:
Frequency-domain analysis
Wireless communication
Peak to average power ratio
Equalizers
Convolution
Bit error rate
Time-domain analysis
Weighted-type fractional Fourier transform (WFRFT)
fast-convolution (FC)
fast-convolution based hybrid carrier (FCHC)
banded minimum mean-square error (MMSE) equalization
Journal
IF:
10.7
Papers:
1.3W
Citations:
5.3W
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