| 摘要 |
<P>PROBLEM TO BE SOLVED: To maintain and enhance communication quality by preventing the deterioration of the communication quality by a transmission stop section by reducing circuits regarding a demodulator of a transmission mode having the transmission stop section. <P>SOLUTION: In channel reception during regular communication, the output signal of an inverse spread part 1-1 is considered as an input signal of a channel estimation part 1-2 which performs channel estimation on the basis of the output signal of the inverse spread part 1-1. A channel estimation value is inputted into a synchronous detection part 1-3 which receives a signal outputted from the inverse spread part 1-1 and performs synchronous detection by performing phase compensation (reverse rotation) to the inputted signal by using the channel estimation value. The transmission stop section switches the input signal of the channel estimation part 1-2 to an output signal of a constant output part 1-4 and calculates the channel estimation value by using a constant as an inverse spread value of the section. A value which makes the channel estimation value zero, or a value of the inverse spread result of the input signal before a transmission gap is used as a value of the constant outputted from the constant output part 1-4. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
