A channel correction method, used for performing channel correction on radio frequency apparatuses in a network area, is provided. The radio frequency apparatuses are divided into at least one radio frequency apparatus group. A correction resource location is set for each radio frequency apparatus in the radio frequency apparatus group. These resource locations may be stored in a form of configuration information in base stations where the radio frequency apparatuses are located, so that the base station controls each of these radio frequency apparatuses to send a correction signal in a respective correction resource location based on the configuration information, and to implement, by using these correction signals, channel correction for the radio frequency apparatuses in the radio frequency apparatus group. The method can implement joint channel correction for a plurality of radio frequency apparatuses and improve correction efficiency.

An apparatus includes a phase offset unit configured to set a phase offset between the first transmission channel and the second transmission channel such that a phase deviation between the first transmission channel and the second transmission channel deviates from zero, a power detection unit configured to detect signal powers of the first transmission channel and the second transmission channel under the phase offset, a processing unit configured to determine, based on the detected signal powers, a deviation correction value between the first transmission channel and the second transmission channel, where the deviation correction value includes a phase correction value, and a phase correction unit configured to set the phase correction value between the first transmission channel and the second transmission channel.

A computer-implemented method of estimating IQ imbalance in a communication system including a transmitter and a receiver. The method includes: defining a system model in which a transmitted signal is affected by TX IQ imbalance, carrier frequency offset (CFO) and RX IQ imbalance; controlling a local oscillator at the transmitter to introduce a known carrier frequency offset (CFO) during a calibration; and estimating unknown parameters in the system model using a pre-defined training sequence to determine the TX IQ imbalance and the RX IQ imbalance.

A receiving device includes: a resampler to convert a sampling rate of a reception signal, and output a first signal that is a signal having been subjected to sampling rate conversion; an equalizer to perform an adaptive equalization process using the first signal as an input, and output a second signal that is a signal having been subjected to the adaptive equalization process and having a sampling rate that is an integer fraction of an input signal; a correlation calculator to calculate a correlation function between the first signal and the second signal; and a rate controller to control a rate conversion ratio for sampling rate conversion in the resampler on a basis of the correlation function.

A channel correction method, used for performing channel correction on radio frequency apparatuses in a network area, is provided. The radio frequency apparatuses are divided into at least one radio frequency apparatus group. A correction resource location is set for each radio frequency apparatus in the radio frequency apparatus group. These resource locations may be stored in a form of configuration information in base stations where the radio frequency apparatuses are located, so that the base station controls each of these radio frequency apparatuses to send a correction signal in a respective correction resource location based on the configuration information, and to implement, by using these correction signals, channel correction for the radio frequency apparatuses in the radio frequency apparatus group. The method can implement joint channel correction for a plurality of radio frequency apparatuses and improve correction efficiency.

A receiving device includes: a resampler to convert a sampling rate of a reception signal, and output a first signal that is a signal having been subjected to sampling rate conversion; an equalizer to perform an adaptive equalization process using the first signal as an input, and output a second signal that is a signal having been subjected to the adaptive equalization process and having a sampling rate that is an integer fraction of an input signal; a correlation calculator to calculate a correlation function between the first signal and the second signal; and a rate controller to control a rate conversion ratio for sampling rate conversion in the resampler on a basis of the correlation function.

A transmitting system and a method of transmitting digital broadcast signal are disclosed. The method of transmitting digital broadcast signal includes generating signaling data including a transmission parameter, wherein the transmission parameter includes a protocol version field identifying between a first transmission mode and a second transmission mode, forming a data group including mobile service data and the signaling data, forming mobile service data packets including the mobile service data and the signaling data in the data group, transmitting the digital broadcast signal including the data group.

A signal transmission circuit element, a multiplexer circuit element and a demultiplexer circuit element are disclosed. The signal transmission circuit element is connected among multiple electronic modules so as to transmit an electrical signal. The signal transmission circuit element includes an input terminal, an input equalizer, an output driver and an output terminal. The input terminal is for inputting an electrical signal to the input equalizer. The output driver is electrically connected to the input equalizer. The output terminal is electrically connected to the output driver so as to output the electrical signal. Accordingly, after the input terminal receives the electrical signal, the input equalizer can perform gain compensation on the electrical signal, and then an output capacitance of the electrical signal is driven by the output driver and outputted through the output terminal.