Recently, the operation mode of the wireless communications has come to be evolved to the multimedia information including moving pictures. As a result, the communication systems capable of dealing with wider-band information in a simple manner may be required. In this respect, a scheme of multi-carrier spread-spectrum (MC-SS) is considered to be promising. In this paper, We propose a MC-SS Unslotted ALOHA system, a simple random-access system, to which the MC-SS scheme is applied, and estimate its throughput performance.
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