Chen Yougan

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The fast temporal variations, long multipath delay spreads, and severe frequency-dependent attenuations of underwater acoustic communication channels are extremely complex that impedes underwater acoustic (UWA) data transmission. To alleviate this problem, channel coding is indispensable in UWA communication system to increase the reliability. In this(More)
In this paper, we propose a frame synchronization method for underwater acoustic communication on mobile platform. This new method involves transmitting signal based on hyperbolic frequency modulated (HFM) signal as a preamble of the frame, while the receiver uses a correlator which is matched to the transmitted signal. This method can provide us with good(More)
Underwater acoustic (UWA) communication channels that vary from stationary with sparse arrivals to rapidly varying and fully reverberant present fading, multipath and refractive properties, greatly impede UWA data transmissions. In order to solve this problem, a receiver with the iterative soft-input/soft-output equalization and decoding that employs(More)
The shallow water acoustic (SWA) channel is one of the most challenging channels in wireless digital communications. In this paper, we propose a good performance, low complexity channel coding scheme using quasi-cyclic LDPC (QC-LDPC) codes to improve the communication system reliability for SWA channels. A system simulation model including QC-LDPC codes for(More)
Several characteristics of underwater acoustic (UWA) communication channels-limited bandwidth, extended multipath and severe fading-impede UWA data transmissions. To solve this problem, we propose to set up a receiver combining repeat-accumulate (RA) coding and high-order modulation, and calculate the channel soft information for RA decoding with high-order(More)
As one of the most alarming underwater noises today, pile driving noise is the only anthropogenic sound source other than explosives that has caused the death of fish , according to the available literature. The present study explored the effects of simulated pile driving noise on the movement behavior of Litopenaeus vannamei. The experiments were conducted(More)
Underwater Acoustic Sensor Networks (UASNs) have recently attracted significant attention for exploration and monitoring in underwater environments. The sensor nodes used in UASNs are powered by batteries that are difficult to recharge or replace. It is imperative that the number of hops deployment in multi-hop networks should be very energy efficient(More)
With the rapid increase in the construction of offshore wind farms and other coastal engineering projects, people begin to realize that anthropogenic underwater noise such as pile driving and underwater explosions can have an adverse impact on marine life. The Japanese eel (Anguilla japonica) is an important economic fish species in China, Japan and South(More)
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