| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the deterioration of an error rate characteristic caused by interference at the time of multiplexing by reducing the extension of a relative peak owing to multiplexing. SOLUTION: A transmitting signal is received by a reception antenna 151, frequency- converted into a base band IQ signal by a frequency which is synchronizes with a transmission frequency in a frequency converting circuit 152, the base band IQ signal is A/D converted by an A/D converting circuit 155 and correlation is obtained by a correlator 156 as against the output. A judging circuit 157 judges a correlator output so as to obtain demodulation data and a spread symbol estimating circuit 11 estimates front and rear spread symbols which are multiplexed by a multiplex spread symbol to be a cancelled object through the use of a judgement output. Then, the timing of the spread symbol to be cancelled and the multiplex spread symbol to be the cancelled object of the A/D conversion output is adjusted by a delay circuit, the front and rear spread symbols to be cancelled which are multiplexed by the multiplex spread symbol to be the cancelled object is cancelled by a subtracting circuit, correlation is obtained by the correlator 13 as against a multiplex signal removing output and its output is judged by the judging circuit 14 so as to obtain demodulation data.</p> |
