Abstract
Future mobile communication system will provide high data rates for a miscellany of new applications. Spectrum efficiency is a key performance indicator that must be considerably improved for the beyond 5G networks. In this paper, a new approach to increase the waveform spectrum efficiency is investigated. This novel schemes combines the faster-thanNyquist signaling with generalized frequency division multiplexing, resulting in a scheme that can hold the main benefits of this innovative waveform with the high spectral efficiency gain. The scheme proposed in this paper abandons the orthogonality principle for the time-frequency grid, reducing the spacing between the subcarriers. The reduced subcarrier spacing does not affect the minimum distance among the transmitted sequences, if the Mazo’s limit is respected and the data can be recovered by a non-linear receiver without bit error penalties. In this paper, maximum likelihood receiver will be used for a proof of conception, showing that the bit error performance is equivalent to the one achieved by orthogonal systems. The system will be integrated with a forward error control scheme, showing that the proposed scheme can be fully integrated with modern error control codes, while improving the spectrum efficiency by 20%.
Highlights
The main design objectives for fifth generation (5G) of mobile communications networks are: 1) improvement of data rate and system capacity with the enhancement Mobile Broadband; 2) support for latency sensitive applications with Ultra Reliable Low Latency Communications (URLLC), and; 3) improvement of number of connected devices and reduction in energy consumption with the massive Machine Type Communications [1]
The faster than Nyquist (FTN)-generalized frequency division multiplexing (GFDM) system proposed in this paper combines the main advantages of FTN with GFDM
This solution is interesting in scenarios where high spectrum efficiency are necessary, but the number of transmit and receive antennas cannot be high, such as enhancement Remote Area Communications (eRAC) operating in VHF and UHF bands in remote areas
Summary
The main design objectives for fifth generation (5G) of mobile communications networks are: 1) improvement of data rate and system capacity with the enhancement Mobile Broadband (eMBB); 2) support for latency sensitive applications with Ultra Reliable Low Latency Communications (URLLC), and; 3) improvement of number of connected devices and reduction in energy consumption with the massive Machine Type Communications (mMTC) [1]. The approach presented in this papers differs from the state of the art by applying compression to a non-orthogonal waveform, adding flexibility, better use of cyclic prefix (CP), and improving the frequency localization of FTN signaling These features are important for future wireless communication systems since new approaches for exploiting the spectrum and new communication strategies will become necessary to address future challenging requirements. Due to its attractive properties, the Polar code was chosen to protect the information transmitted on the control channel in 5G networks [11] For these reasons, this coding scheme was selected to be integrated with the FTN-GFDM waveform proposed for performance analysis purposes.
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