Optimal Design of Modulation Parameters for Underwater Acoustic Communication
Keywords:
Carrier waveform inter-displacement, genetic algorithm, time reversal mirror, underwater acoustic communication .Abstract
As the main way of underwater wireless
communication, underwater acoustic communication is paid
more and more attention in ocean research field in recent years.
Compared with the free space wireless communication, the
underwater acoustic communication suffers from the limits of
the less available bandwidth, the more serious multipath effect
and the even complex noise caused by the underwater acoustic
channel. The communication scheme based on Phase Shift
Keying (PSK) modulation and Time Reversal Mirror (TRM)
equalization is considered to be a suitable one to achieve a
reliable underwater acoustic communication. However, the
scheme experiences a high Bit Error Rate (BER) due to the
severe distortion of the received signals caused by the channel.
To solve this problem, Carrier Waveform Inter-Displacement
(CWID) modulation was proposed to use together with TRM
equalization recently. The CWID modulation is based on Linear
Frequency Modulation (LFM) PSK. The main idea of the
CWID modulation is increasing the difference between the
carrier waveforms of different symbols to reduce BER. The
LFM carrier-waves with different frequency bands lead to
different performance. Therefore it is important to find out the
optimal frequency band of the carrier-waves to improve the
performance of the communication. The Genetic Algorithm
(GA) is introduced to search the optimal frequency band in this
paper, due to its excellent performance in solving complicated
optimization problems. Simulations were done to compare the
performance of different modulation frequencies. The
simulation results showed the superiority of the optimized
CWID modulation method and the effectiveness of GA
optimization.
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