PERFORMANCE ANALYSIS ON RELAY ASSISTED CDMA-CA NETWORKS IN UNDERWATER COMMUNICATION

Electronics and communication engineering

Wireless transmission through the ocean is one of the enabling technologies for the development of future ocean-observation systems and sensor network applications. In this paper, the design aspects of different modulation schemes based on Code Division Multiple Access/ Collision Avoidance (CDMA/CA) for underwater acoustic (UWA) communications has been discussed, and its performance is analyzed using MATLAB software. The design criterion is to maximize the system throughput under a target average bit error rate (BER). The signals used to carry digital data via underwater channel are the acoustic waves because they can travel over a long distance unlike the radio signals like electromagnetic waves which cannot be used because they spread over short distances. It is very difficult to design an underwater communication system because of multipath, Doppler effects, noise, and attenuation. These factors lead to errors in the communication performance and limitation of maximum propagation distance. This analysis help us to calculate the distance that can be realized using the code division multiple access (CDMA) technique with direct-sequence spread spectrum in an underwater communication system considering only the attenuation and noise present in the acoustic channel.

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