| 摘要 |
PROBLEM TO BE SOLVED: To eliminate communication errors even when the change of a system scale and the change of a line number are present by judging the level of an error in a system in a base station and generating a new PN code provided with a code length corresponding to the level in the transmitter-receiver of a subscriber's terminal. SOLUTION: Signals received by an antenna 41 are passed through a duplexer 42 and inversely spread-demodulated to base band signals in a demodulator 43 and an exclusive OR with a PN code from a PN code generator 51 is obtained in an adder 44. Also, in the demodulator 43, code length specifying data are extracted from control signals transmitted from the base station and outputted to the PN code generator 51. In the case of transmission, speech signals from a microphone 50 are converted to digital signals in an A/D converter 49, the exclusive OR with the PN code from the PN code generator 51 is obtained in the adder 48, a spreading processing is performed and modulation is performed by a modulator 4-1. The PN code generator 51 receives code length data from the demodulator 43, generates the new PN code and supplies it to the adders 44 and 48. |
