Murad Mohsin, Tasadduq Imran A, Otero Pablo
Telecommunication Engineering School, University of Malaga, 29071 Malaga, Spain.
Institute of Oceanic Engineering Research, University of Malaga, 29071 Malaga, Spain.
Sensors (Basel). 2022 Mar 30;22(7):2639. doi: 10.3390/s22072639.
The performance of the coded generalized frequency division multiplexing (GFDM) transceiver has been evaluated in a shallow underwater acoustic channel (UAC). Acoustic transmission is the scheme of choice for communication in UAC since radio waves suffer from absorption and light waves scatter. Although orthogonal frequency division multiplexing (OFDM) has found its ground for multicarrier acoustic underwater communication, it suffers from high peak to average power ratio (PAPR) and out of band (OOB) emissions. We propose a coded-GFDM based multicarrier system since GFDM has a higher spectral efficiency compared to a traditional OFDM system. In doing so, we assess two block codes, namely Bose, Chaudari, and Hocquenghem (BCH) codes, Reed-Solomon (RS) codes, and several convolutional codes. We present the error performances of these codes when used with GFDM. Furthermore, we evaluate the performance of the proposed system using two equalizers: Matched Filter (MF) and Zero-Forcing (ZF). Simulation results show that among the various block coding schemes that we tested, BCH (31,6) and RS (15,3) give the best error performance. Among the convolutional codes that we tested, rate 1/4 convolutional codes give the best performance. However, the performance of BCH and RS codes is much better than the convolutional codes. Moreover, the performance of the ZF equalizer is marginally better than the MF equalizer. In conclusion, using the channel coding schemes with GFDM improves error performance manifolds thereby increasing the reliability of the GFDM system despite slightly higher complexity.
已在浅海水声信道（UAC）中评估了编码广义频分复用（GFDM）收发器的性能。由于无线电波会遭受吸收，光波会散射，因此声传输是UAC通信的首选方案。尽管正交频分复用（OFDM）已在多载波水声通信中得到应用，但其存在高峰均功率比（PAPR）和带外（OOB）发射的问题。我们提出一种基于编码GFDM的多载波系统，因为与传统OFDM系统相比，GFDM具有更高的频谱效率。在此过程中，我们评估了两种分组码，即博斯、乔德里和霍昆格姆（BCH）码、里德 - 所罗门（RS）码，以及几种卷积码。我们展示了这些码与GFDM一起使用时的误码性能。此外，我们使用两种均衡器评估了所提出系统的性能：匹配滤波器（MF）和迫零（ZF）。仿真结果表明，在我们测试的各种分组编码方案中，BCH（31,6）和RS（15,3）具有最佳的误码性能。在我们测试的卷积码中，速率为1/4的卷积码性能最佳。然而，BCH码和RS码的性能远优于卷积码。此外，ZF均衡器的性能略优于MF均衡器。总之，将信道编码方案与GFDM一起使用可显著提高误码性能，从而提高GFDM系统的可靠性，尽管复杂度略有增加。
