What is it about?
A major trend of the current research in 5G is to find well time and frequency localized waveforms, dedicated to non-orthogonal wireless multi-carrier systems. The ping-pong optimized pulse shaping (POPS) paradigm was proposed as a powerful technique to generate a family of waveforms, ensuring an optimal signal to interference plus noise ratio (SINR) at the receiver. In this paper, we derive, for the first time, the analytical expression of the SINR for FBMC/OQAM systems. We then adopt the POPS algorithm in the design of optimum transmit and receive waveforms for FBMC/OQAM, with respect to the SINR criterion. For relatively high dispersions, numerical results show that the optimized waveforms provide a gain of 7 dB, in terms of SINR, compared to the PHYDYAS waveform. They also show that the obtained waveforms offer better out-of-band (OOB) emissions with regard to those of the IOTA waveform. Furthermore, we notice that FBMC/OQAM systems present a gain of 4 dB in SINR, compared to FBMC/QAM systems, when both operate at their time-frequency lattice critical densities. However, FBMC/QAM systems can guarantee, with a reduced computational complexity, a comparable performance to FBMC/OQAM systems, in terms of SINR, when their spectral efficiency is relatively reduced by less than 5%.
Featured Image
Why is it important?
Our main contributions in this paper are the following: (i) We provide an analytical expression of the SINR, for FBMC/OQAM systems, in arbitrary channel conditions, for whatever Tx/Rx waveforms. (ii) We compare, theoretically, the performances of FBMC/QAM and FBMC/OQAM systems in an arbitrary propagation framework. (iii) We present and detail the performance of FBMC/QAM systems with lattice densities below or equal to 1. (iv) We quantify potential gains that can be realized by FBMC/OQAM systems with respect to FBMC/QAM systems, using identical and/or different lattice densities. (v) We compare the performances of POPS waveforms with respect to PHYDYAS and IOTA waveforms, in FBMC/OQAM systems.
Perspectives
A possible challenging research axis of the presented work consists in extending this comparison to the case of discrete time, hexagonal time-frequency lattices, and multipulse systems. Although our research team has already worked on multipulse systems, we believe that this concept is topical and continues to present new perspectives through the adoption of the POPS paradigm for both FBMC/OQAM and FBMC/QAM systems.
Wafa Khrouf
Read the Original
This page is a summary of: How Much FBMC/OQAM Is Better than FBMC/QAM? A Tentative Response Using the POPS Paradigm, Wireless Communications and Mobile Computing, January 2018, Hindawi Publishing Corporation,
DOI: 10.1155/2018/4637181.
You can read the full text:
Contributors
The following have contributed to this page
