By employing spectrum sensing and frequency-domain spreading cognitive-CDMA systems, allow users to interact with surrounding. Environment and transmit signal over clean and non continuous spectrum bands. The idea of cognitive - CDMA is oriented. From transform domain communication systems (TDCS), which have been widely used as a CR overlay technology [6] - [10]. The. Basic idea behind TDCS aims to dynamically synthesis a smart waveform based on the knowledge of surrounding environment. [11] - [14].
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