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It is tough to achieve higher transmit speed and lower bit error rate(BER) because of the complexity of the underwater acoustic channel. This paper proposes a method of orthogonal frequency division multiplexing (OFDM) modulation technique for improving the situation. It can reduce BER with the ability of resisting multi-path interference and can increase communication rate with the characteristic...
This paper proposes a basic MC-CMDA. via carrier interferometry Codes (CI codes) in an Underwater Acoustic(UWA) Channel. Compared with OFDM in UWAC, it can allow a number of users simultaneously and asynchronously accessing the UWA channel. A trade off relation exists between diversity gain and user capacity as well as between spread spectrum gain and system efficiency. Then diversity combining scheme...
In this paper, we present a method of transform-domain channel estimation for orthogonal frequency division multiplexing (OFDM). The estimator based on minimum mean squared error (MMSE), and a process of FFT and IFFT is added. The system has been tested in a real underwater acoustic channel - the experimental pool in Xiamen University. The experimental result shows that the transform-domain channel...
Based on our previous work, a novel design of a carrier interferometry (CI) orthogonal frequency division multiplexing (OFDM) system had been tested in a real underwater acoustic channel - the experimental pool in Xiamen University. Since the CI/OFDM system is very sensitive to phase offsets, a simplified 2D estimator is used to reconstruct the channel response at the receiver. The performance of...
Underwater acoustic (UWA) channel is a time-space-frequency varying channel. Coherent detection requires channel estimation in Orthogonal Frequency Division Multiplexing (OFDM) system. In this paper, the channel estimation methods based on pilot for OFDM UWA system are investigated. Through analysis and testing about two channel estimation performance, the adaptability based on Pilot Symbol Assisted...
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