Abstract
Generalized frequency division multiplexing (GFDM) is a newly introduced technique for the wireless fifth-generation (5G) standard based on multicarrier filter bank theory, which has the advantage of flexibility in setting the number of subcarriers and subblocks. The application of GFDM in underwater acoustic (UWA) communication can take full advantage of the limited spectral resources, which is a prime limitation in UWA communication and will promote the development of UWA network technology. However, the multicarrier communication technique utilized in radio 5G communication offers difficulty in channel estimation, and the influence of a channel cannot be ignored especially in the UWA communication field. Therefore, GFDM cannot be implemented directly in UWA communication; to solve this problem, a system combining chaotic sequence spread spectrum technology with GFDM is proposed, which is a novel technique with high spectrum efficiency. Simulation and experimental results verified the effectiveness of the proposed system.
Highlights
Next-generation communication technology is aimed at achieving a higher data transmission rate, and bandwidthlimited underwater acoustic (UWA) communication is no exception
The implementation of Generalized frequency division multiplexing (GFDM) is based on the filter bank theory, which causes trouble in the channel estimation, and to the best of our knowledge, no related research has solved this problem yet; the application of GFDM has been limited to radio communication only
GFDM is a two-dimensional block structure technology based on the filter banks [7, 8], which divides the transmitting data into different subblocks and subcarriers, and each subcarrier is filtered through a prototype filter, which has the advantage of low out-of-band leakage and low PAPR
Summary
Next-generation communication technology is aimed at achieving a higher data transmission rate, and bandwidthlimited UWA communication is no exception. One of the solutions for this problem, which recently attracted researchers’ attention, is the emerging multicarrier scheme GFDM. The implementation of GFDM is based on the filter bank theory, which causes trouble in the channel estimation, and to the best of our knowledge, no related research has solved this problem yet; the application of GFDM has been limited to radio communication only. The influence of the time-varying frequency-selective UWA channels cannot be ignored [5, 6], and the GFDM technology cannot be applied directly to the UWA communication. CSSS (GFDM-chaotic sequence spread spectrum) system which combined GFDM and spread spectrum technologies to overcome the channel estimation problem.
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