A signal input from a microphone is A-D converted by an A-D converter, is frequency differentiated by a pre-emphasis circuit, and is input to a shift control circuit. The shift control circuit includes a limiter circuit, a phase shifter, and a harmonic suppressor. The limiter circuit performs amplitude limitation so as to limit the amplitude of the input control target signal to be equal to or less than a first threshold. The phase shifter shifts, for the control target signal having the amplitude limited, a phase of a frequency component within the predetermined frequency range. The harmonic suppressor suppresses, for the control target signal phase-shifted by the phase shifter, a frequency component equal to or greater than a second threshold, and outputs an information signal that is the control target signal having the frequency component of equal to or greater than the second threshold suppressed. The modulator performs frequency modulation on a carrier wave in accordance with the information signal. The transmitter produces a transmission signal from the frequency-modulated carrier wave, and transmits the transmission signal via an antenna.

A method includes receiving a signal from a remote transmitter via an electrically-tunable antenna having a tunable element. An adjustment, to be applied to a response of the electrically-tunable antenna, is calculating by analyzing the received signal. The response of the electrically-tunable antenna is adapted by controlling the tunable element responsively to the estimated adjustment.

A method includes receiving a signal from a remote transmitter via an electrically-tunable antenna having a tunable element. An adjustment, to be applied to a response of the electrically-tunable antenna, is calculating by analyzing the received signal. The response of the electrically-tunable antenna is adapted by controlling the tunable element responsively to the estimated adjustment.

A radio communication receiver apparatus is configured to process multiple radio frequency bands in a telecommunication system. The apparatus includes a plurality of digital receiver chains wherein each digital receiver chain is coupled to receive a digital representation of the multiple radio frequency bands, including a particular radio frequency band for processing by the respective digital receiver chain. Each digital receiver chain includes a digital receiver that is programmable to select a particular radio frequency band from the digital representation of the multiple radio frequency bands, and configured to down convert the selected radio frequency band into a digital baseband signal associated with the particular radio frequency band. Built in calibration is provided by operation of direct radio frequency technology.

A radio communication receiver apparatus is configured to process multiple radio frequency bands in a telecommunication system. The apparatus includes a plurality of digital receiver chains wherein each digital receiver chain is coupled to receive a digital representation of the multiple radio frequency bands, including a particular radio frequency band for processing by the respective digital receiver chain. Each digital receiver chain includes a digital receiver that is programmable to select a particular radio frequency band from the digital representation of the multiple radio frequency bands, and configured to down convert the selected radio frequency band into a digital baseband signal associated with the particular radio frequency band. Built in calibration is provided by operation of direct radio frequency technology.

A method an apparatus for performing automatic frequency compensation (or control) is disclosed. A method and apparatus for performing automatic frequency compensation (or control) is disclosed. In one embodiment, a method includes a radio receiver receiving a radio signal and detecting a preamble in the radio signal. The method further includes freezing an automatic frequency compensation (AFC) loop responsive to detecting the preamble. A clock source of the AFC loop may be switched from a first clock signal to a second clock signal. The method further includes subsequently unfreezing the AFC loop.

A method an apparatus for performing automatic frequency compensation (or control) is disclosed. A method and apparatus for performing automatic frequency compensation (or control) is disclosed. In one embodiment, a method includes a radio receiver receiving a radio signal and detecting a preamble in the radio signal. The method further includes freezing an automatic frequency compensation (AFC) loop responsive to detecting the preamble. A clock source of the AFC loop may be switched from a first clock signal to a second clock signal. The method further includes subsequently unfreezing the AFC loop.

A wireless communication system corresponding to a wireless terminal device in which at least one of a first frequency bandwidth for use in an up link and a second frequency bandwidth for use in a down link is variable, including a capability information reception unit capable of receiving and extracting terminal capability information transmitted from the wireless terminal device and related to capability of the wireless terminal device; a category designation unit capable of designating a terminal category to which the wireless terminal device belongs, based on the terminal capability information received and extracted by the capability information reception unit; and a link setting unit capable of setting a link to the wireless terminal device and transmitting a control signal depending on the link setting to the wireless terminal device, based on the terminal category designated by the category designation unit.