| 摘要 |
PURPOSE: A synchronous demodulating device within a base station of an IS(Interim Standard)-2000 system is provided to implement synchronous demodulation, and to improve receiving performance up to 3dB degrees compared to asynchronous demodulation, thereby increasing subscribers. CONSTITUTION: The first synchronous demodulating circuit(100) demodulates user signals of many terminals, respectively. A channel estimation circuit(200) estimates channel parameters of each terminal by using each pilot channel of the terminals. A receiving signal delaying circuit(300) delays receiving signals as one symbol, and outputs the delayed signals. An interference signal regeneration circuit(400) inputs the user signals to create many interference signals, and removes each interference signal corresponding to many subscribers from the delayed receiving signals. The second synchronous demodulating circuit(500) inputs the receiving signals, and finally demodulates the signals to output the demodulated signals. |
