Abstract: Disclosed are a channel estimation method and system, a device, and a storage medium. The method includes: acquiring a channel type and a channel expression under a multi-user environment first, and then according to the channel type, determining a training sequence set, training sequences in the training sequence set being zero circular convolution sequences; and according to the channel type, the channel expression and the training sequence set, determining an output sequence.

Abstract: A method for generating a random sequence using an exponential function as a random number source, including: providing an exponential function ab, wherein, the base a is an integer, and the exponent b is an integer; expanding a value of the exponential function into a first preliminary sequence in decimal; and using the first preliminary sequence as a random number source to generate a random sequence.

Abstract: A communication receiving apparatus, a signal receiving method thereof, and a signal transmitting method based Code Division Multiple Access (CDMA) technology are provided. A communication transmitting apparatus encodes an original data sequence based on a perfect Gaussian integer sequence (PGIS) to generate a spread signal and transmits a radio frequency (RF) signal including the spread signal. An autocorrelation function of the PGIS conforms to an impulse characteristic, and the PGIS has a spectrum with equal magnitude. The communication receiving apparatus obtains the RF signal from the communication transmitting apparatus and transforms the RF signal into a baseband signal. The baseband signal is de-modulated into a data stream by the communication receiving apparatus. The data stream is recovered into at least one data value of the original data sequence based on the PGIS by the communication receiving apparatus.

Abstract: A communication receiving apparatus, a signal receiving method thereof, a signal processing method, and a signal transmitting method based Code Division Multiple Access (CDMA) technology are provided. The signal processing method includes the following steps: the communication transmitting apparatus encodes an original data sequence based on a perfect Gaussian integer sequence (PGIS) to generate a spread signal and transmits a radio frequency (RF) signal including the spread signal. An autocorrelation function of the PGIS conforms to an impulse characteristic, and the PGIS has a spectrum with equal magnitude. The communication receiving apparatus obtains the RF signal from the communication transmitting apparatus and transforms the RF signal into a baseband signal. The baseband signal is de-modulated into a data stream by the communication receiving apparatus. The data stream is recovered into at least one data value of the original data sequence based on the PGIS by the communication receiving apparatus.

Abstract: A safety device for use in a bathroom includes a float and a detecting and controlling assembly. The float has a housing defining a receiving space. The detecting and controlling assembly is mounted in the receiving space. The detecting and controlling assembly includes an inclination detector, a processing unit, and a transmitting unit. The inclination detector and the transmitting unit are electrically connected to the processing unit. The inclination detector is adapted to detect a posture of the float and adapted to send a detection signal indicative of the posture of the float to the processing unit. The processing unit processes and analyzes the detection signal and sends out an emergency signal through the transmitting unit.