Abstract: A key detecting method and apparatus, which relate to touch sensing technologies, where the key detecting method includes: sampling an output signal value, and calculating a current noise value and a current signal value respectively according to the sampling result (S101); determining, according to the current noise value and the current signal value, whether a noise variation and a signal variation reach a corresponding noise variation threshold and signal variation threshold, respectively (S102); and determining an operating state of a key according to the determination result (S103). With the above method and apparatus, there is no need to additionally provide a complex auxiliary circuit to realize detection of a state of the key, instead, a state of a smart terminal is determined by correspondingly sampling and calculating the signal value, thereby reducing the cost and meanwhile improving the accuracy of the detection of the state of the key.

Abstract: A key detecting method and apparatus, which relate to touch sensing technologies, where the key detecting method includes: sampling an output signal value, and calculating a current noise value and a current signal value respectively according to the sampling result (S101); determining, according to the current noise value and the current signal value, whether a noise variation and a signal variation reach a corresponding noise variation threshold and signal variation threshold, respectively (S102); and determining an operating state of a key according to the determination result (S103). With the above method and apparatus, there is no need to additionally provide a complex auxiliary circuit to realize detection of a state of the key, instead, a state of a smart terminal is determined by correspondingly sampling and calculating the signal value, thereby reducing the cost and meanwhile improving the accuracy of the detection of the state of the key.

Abstract: A method for detecting pilot sequence signal includes: when the service data signal in the received signal is confirmed to be right, the said service data signal is extracted from the received signal, wherein, the service data signal and the pilot sequence signal in the received signal are located in the same slot; the pilot sequence signal is obtained from the received signal having been extracted the service data signal. At the same time, a communication device and a communication system are provided. The interference of pilot sequence signal made by the service data signal can be restrained, the detecting performance of the pilot sequence can be enhanced by using the present invention.

Abstract: A method for detecting pilot sequence signal includes: when the service data signal in the received signal is confirmed to be right, the said service data signal is extracted from the received signal, wherein, the service data signal and the pilot sequence signal in the received signal are located in the same slot; the pilot sequence signal is obtained from the received signal having been extracted the service data signal. At the same time, a communication device and a communication system are provided. The interference of pilot sequence signal made by the service data signal can be restrained, the detecting performance of the pilot sequence can be enhanced by using the present invention.