| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a coding communication unit that can realize stable data transmission reception even under a low C/N environment and extend the communication distance without the need for a carrier recovery circuit and a frequency correction circuit or the like in data communication adopting the spread spectrum communication technology. SOLUTION: The communication unit consists of a QPSK modulation demodulation section 5 that receives a coded signal from a spread coding communication unit that uses a prescribed spread code so as to spread transmission data into spread data and transmits the spread data as the coding signal of the data of a phase rotation sequence depending on the waveform phase rotation direction, a signal difference arithmetic unit 7 that obtains the spread data depending on the phase rotation direction of the received coded signal and a matched filter 8 that applies inverse spread processing to the spread data on the basis of the spread code to recover the transmission data.</p> |
