Towards Multicarrier Waveforms Beyond OFDM: Performance Analysis of GFDM Modulation for Underwater Acoustic Channels

Mohsin Murad,Pablo Otero,Imran A Tasadduq

doi:10.1109/access.2020.3043718

Abstract

In this paper, we assess the performance of a generalized frequency division multiplexing (GFDM) transceiver for underwater acoustic high data-rate transmission. We also present a comprehensive overview of the work done in the field of next generation multicarrier techniques beyond orthogonal frequency division multiplexing (OFDM) for underwater acoustic (UWA) channels. Since very little work has been done in determining the feasibility of acoustic GFDM, we evaluate the performance of proposed GFDM transceiver in terms of spectral efficiency, peak to average power ratio, error rates and complexity using simulations. We employ two types of receivers - matched filter and zero forcing and evaluate their performances for several system configurations. Results presented show that the zero forcing receiver outperforms the matched filter receiver at high SNR values for almost all the configurations; exceptions being the cases where 1 st and 4 th Xia pulse shapes are employed with higher values of the roll off factor. We also compare the performance of the proposed GFDM transceiver with that of OFDM and show that GFDM outperforms OFDM by almost 4 dB for a symbol error rate of 10 -2 . It is concluded that while GFDM is computationally more demanding than OFDM, it is still an appealing technique for future UWA communications due to its higher spectral efficiency, flexibility, and better error performance.

Highlights

Underwater acoustic communication has always been the preferred choice for data transmission in one of the most complex channels [1]
The remaining paper is arranged as follows: In Section 2, we present a survey of all the related work associated with generalized frequency division multiplexing (GFDM), OQAM-filter bank multicarrier (FBMC), FMT-FBMC and F-orthogonal frequency division multiplexing (OFDM) for underwater acoustic (UWA) transmission
We have presented a survey of post-OFDM multicarrier waveforms for UWA channels

Summary

INTRODUCTION

Underwater acoustic communication has always been the preferred choice for data transmission in one of the most complex channels [1]. It is prone to frequency offsets caused by the time variations due to comparative motion of the receiver and transmitter in the underwater channel. The time and frequency responses of the prototype filter are altered according to the requirements This leads to reduced OOB emissions compared to a cyclic prefix OFDM (CP-OFDM) system. FBMC is another promising technique that performs well in doubly dispersive acoustic channels and it has a higher bandwidth efficiency given the absence of a cyclic prefix [10, 11]. The total number of subcarriers are split into multiple sub-bands and each one is filtered through a filter of specific length This filtering operation results in lowest OOB emissions compared to the other waveforms.

LITERATURE SURVEY

SHALLOW UNDERWATER ACOUSTIC CHANNEL MODEL

SIMULATION SETUP AND RESULTS

CONCLUSION