An apparatus includes a radio frequency (RF) receiver. The RF receiver includes a timing correlator and frequency offset estimator. The timing correlator and frequency offset estimator: (a) extracts timing from a set of samples derived from an RF signal, and (b) determines a frequency offset estimate from the set of samples.

Degradation of a reception performance by an image signal is reduced. A semiconductor device includes: an oscillation circuit configured to generate a local signal; a mixer configured to multiply a reception signal by the local signal; an analog filter configured to filter a signal output from the mixer; an AD converter configured to digitalize a signal that has passed through the analog filter to generate a first signal; a digital filter configured to filter a signal that has passed through the AD converter to generate a second signal; a power comparator configured to detect the power difference between the first signal and the second signal; a register configured to store a theoretical power difference; and a determination unit configured to determine a frequency of the local signal based on the power difference from the theoretical power difference.

A receiving device according to the present invention includes: a search range control unit that determines, for a reception signal including a plurality of wireless signals partially overlapping on at least one of a time axis and a frequency axis and received by a moving object, a search range for the plurality of wireless signals in a search space including the time axis and the frequency axis based on information on position and velocity of the moving object; a time frequency detection unit that generates information on time and frequency at which a wireless frame included in each of the plurality of wireless signals is received in the search range for the reception signal determined by the search range control unit; and a detection unit that demodulates the reception signal to acquire the wireless frame based on the information on time and frequency generated by the time frequency detection unit.

In order to eliminate timing offset between reproduction devices when a content transmitted from a distribution device is received and reproduced by a plurality of reproduction devices, data (SCR) indicating the elapsed time from the start of the content, generated by counting clock pulses, and data (FCR) indicating a frame number generated by counting the number of frames reproduced by a decoder (54) are transmitted by the distribution device, and a clock generation unit (103) in each reproduction device is controlled so that data (STC) indicating the elapsed time and data (FTC) indicating the frame number, which are generated in the same manner by each reproduction device, match the transmitted data (SCR, FCR). Synchronization between reproduction devices can thereby be established even when, in a state in which a content is being reproduced by one reproduction device, another reproduction device subsequently connects to the distribution device.

Degradation of a reception performance by an image signal is reduced. A semiconductor device includes: an oscillation circuit configured to generate a local signal; a mixer configured to multiply a reception signal by the local signal; an analog filter configured to filter a signal output from the mixer; an AD converter configured to digitalize a signal that has passed through the analog filter to generate a first signal; a digital filter configured to filter a signal that has passed through the AD converter to generate a second signal; a power comparator configured to detect the power difference between the first signal and the second signal; a register configured to store a theoretical power difference; and a determination unit configured to determine a frequency of the local signal based on the power difference from the theoretical power difference.

Methods and systems for correcting carrier frequency offsets (CFOs) in a wireless transceiver are disclosed. The method includes receiving a first predetermined number of data packets and analyzing the first predetermined number of data packets to determine one or more wireless link quality metrics. The method includes adjusting a local oscillator in accordance with a first local oscillator adjustment strategy. The method includes receiving a second predetermined number of data packets and analyzing the second predetermined number of data packets to determine the one or more wireless link quality metrics. The method includes repeating the first local oscillator adjustment strategy if the wireless link quality metrics improve. The method includes changing to a second local oscillator adjustment strategy if the wireless link quality metrics worsen and adjusting the local oscillator in accordance with the second local oscillator adjustment strategy.

In a method and system for decoding a differential M-ary phase or quadrature amplitude modulated signal, the incoming signal is decoded according to a plurality of different decoding rules, wherein said plurality of decoding rules correspond to different values of a resulting frequency difference or mismatch between a signal frequency and a local oscillator reference frequency. The invention allows to increase a tolerance window for the maximal allowable frequency offset, and thus helps to speed up an initial locking process or to allow for equipment which has a lower tuning granularity.

There is provided an apparatus, said apparatus comprising means for receiving from a network, at a user equipment, Doppler shift information associated with at least one cell of the network as a function of time for at least one area and using the Doppler shift information at the user equipment to compensate for the Doppler shift in communication with the network when the user equipment is in the at least one area.

Processing a digital bit stream and systems for implementing the methods are provided. The method includes dividing the digital bit stream into a plurality of data packets. In a first processing block performing a carrier recovery error calculation on a first portion of the plurality of data packets, comprising preforming a first phase locked loop (PLL) function on decimated data of the data packets and performing a carrier recovery operation on the first portion of the plurality of data packets. In a second processing block, in parallel with the processing of the first portion of the plurality of packets, performing the carrier recovery error calculation on a second portion of the plurality of data packets, comprising preforming the first PLL function on decimated data of the data packets and performing the carrier recovery operation on second portion of the plurality of data packets.

Calibrating a Gaussian frequency-shift keying modulation index includes generating a training sequence of bits, shaping a pulse from the training sequence according to an initial modulation index, and converting the shaped signal to a transmission signal. The transmission signal is then either looped through a radio frequency core or processed by frequency deviation estimation hardware to determine a frequency deviation. The frequency deviation is converted to a new modulation index, and potentially a ratio between a target modulation index and a measured modulation index as a scaling factor. The process is then iteratively repeated until a threshold frequency deviation is achieved.