Title :
Design and implementation of OFDM acoustic modem for underwater communication
Author :
Hsien-Sen Hung ; Chih-Ling Wei ; Chiu, Lin-Kai ; Chi-Fang Chen
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Ocean Univ., Keelung, Taiwan
Abstract :
This paper is aimed to develop a low-complexity receiver by treating Doppler rate (phase offset) as nuisance parameter in the hybrid channel estimation. For slowly changing channels, two simple adaptive equalization schemes, based on least squares (LS) and minimum mean-squared error (MMSE) principles, are proposed. For fast-changing channels, we adopt pilot-based channel estimation for equalization. We show the bit-error-rate (BER) performance of the OFDM detectors over a set of measured channel impulse responses in the northeastern sea of Taiwan. Simulation results reveal that adaptive equalizers and pilot-based equalizer can perform quite well in calm and fast-changing channel conditions respectively.
Keywords :
Doppler effect; OFDM modulation; acoustic receivers; adaptive equalisers; channel estimation; error statistics; least mean squares methods; modems; transient response; underwater acoustic communication; BER; Doppler rate; LS principle; MMSE principle; OFDM acoustic modem implementation; OFDM detector; Taiwan northeastern sea; adaptive equalization scheme; adaptive equalizer; bit error rate; channel impulse response; fast-changing channel condition; hybrid channel estimation; least squares principle; low-complexity receiver; minimum mean-squared error principle; nuisance parameter; pilot-based channel estimation; underwater communication; Adaptive equalizers; Channel estimation; Doppler effect; Frequency response; OFDM; Receivers; Simulation; adaptive equalizer; multicarrier modulation; orthogonal frequency division multiplexing (OFDM);
Conference_Titel :
OCEANS 2014 - TAIPEI
Conference_Location :
Taipei
Print_ISBN :
978-1-4799-3645-8
DOI :
10.1109/OCEANS-TAIPEI.2014.6964295
