| 摘要 |
According to the invention, a transmission quality is not deteriorated and, when a system is applied to a variable bit rate transmission, a high-precision transmission electric power control can be executed. An Eb/Io calculating circuit 11 calculates an Eb/Io value of a signal electric energy per bit Eb and an interference electric power per Hz Io from a reception base-band signal rs from a radio receiving unit 20 every bit rate. A maximum value detecting unit 16 detects a maximum value from the Eb/Io values. The maximum Eb/Io value is compared with a target Eb/Io value by a comparing unit 17 and a transmission electric power control bit for allowing the transmission electric power to be decreased when the maximum Eb/Io value is larger than the target Eb/Io value and, in the case contrary to the above, for allowing the transmission electric power to be increased is generated to a multiplexing unit 103. The TPC bit and transmission data td are multiplexed. The multiplex data is modulated, its frequency is converted, and the resultant data is transmitted at an electric power based on the TPC bit by a radio transmitting unit 30. <IMAGE> |
