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| A Transmitter Diversity Scheme Based on Labelled Delay Space Time Spreading in Underwater Acoustic Communication Systems |
| Zhang Xin; Zhang Xiao-ji |
| College of Marine Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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Abstract A transmit diversity scheme, called Labelled Delay Space-Time Spreading (LDSTS) is proposed for communication systems in underwater acoustic(UWA) channels with propagation delays and multipath spreading. The scheme eliminates the propagation delays and multipath delays by using the channel probe signals, transmitted in sequence and Rake receivers. The signals are transmitted from transducers in sequence enable the scheme is practice for applications to UWA communication system. The signal models are proposed and BER performances of the scheme with FSK and PSK modulation are analyzed. Simulations results show that the scheme realizes complement transmit diversity gains in multipath UWA channel.
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Received: 22 September 2008
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2009, Vol. 31 
