The Phase Estimation Algorithm of Arrival Time Difference in MIMO Underwater Sensor Communication

In this paper, we proposed receiver structure based on an iterative turbo equalization to cope with phase difference between two sensors in MIMO underwater communication channel. In a space-time coded system, it is often assumed that there are no phase errors among the multiple transmitter and receiver chains. In this paper, we have studied the effect of the phase errors between different transmit sensors and different propagation paths in the environment of MIMO underwater communication system, and have shown through BER performance by computer simulations that the bit-error-rate performance can be severely degraded. A decision-directed estimation and compensation algorithm has been proposed to minimize their effects on the system performance. In this paper, we investigate the phase differences and their effects on multiple-input and multiple-output systems, and propose a compensation algorithm for underwater channel model to minimize their effects. 키워드 : 시공간 격자 부호, 터보 등화기, 수중 음향 통신, DD-Loop, MIMO Key word : Space time trellis code, Turbo Equalization, Underwater acoustic communication, Decision Directed Loop, MIMO(Multiple Input Multiple Output) Journal of the Korea Institute of Information and Communication Engineering 한국정보통신학회논문지(J. Korea Inst. Inf. Commun. Eng.) Vol. 19, No. 7 : 1531~1538 Jul. 2015