Abstract: A multiple input multiple output signal receiving apparatus includes a first antenna configured to receive a first radio frequency (RF) signal, a second antenna configured to receive a second RF signal, a superheterodyne receiver, a direct conversion receiver, and an antenna switching module. The superheterodyne receiver is configured to convert one or both of the first and second RF signals into at least one first analog signal. The direct conversion receiver is configured to convert one or both of the first and second RF signals into at least one second analog signal. The antenna switching module couples the first and second antennas to the superheterodyne receiver and the direct conversion receiver, and is configured to selectively direct the first and second RF signals to the superheterodyne receiver and/or the direct conversion receiver, depending on an antenna switch control signal indicating a signal quality derived from the first and second analog signals.

Abstract: A method is disclosed for optimizing up-link transmit powers of a wireless broadband terminal operating in a predetermined frequency band in a multi-carrier system, the method comprising assigning a transmit signal to one or more sub-carriers of predetermined frequencies, and capping the output powers of the transmit signal to a predetermined level based on the predetermined frequencies, wherein the output power of the transmit signal is lower if frequencies of the transmit signal have less guard band to the edge of the predetermined frequency band.

Abstract: A MIMO signal receiving apparatus includes a first antenna for receiving a first RF signal; a second antenna for receiving a second RF signal; a superheterodyne receiver for receiving one or all of the first and second RF signals into at least one first analog signal; a direct conversion receiver for converting one or all of the first and second RF signals into at least one second signal; and an antenna switching module coupling the first and second antennas to the superheterodyne receiver and the direct conversion receiver for electively directing the first and second RF signals to the superheterodyne receiver and/or the direct conversion receiver, depending on an antenna switch control signal indicating a signal quality derived from the first and second analog signals.

Abstract: A power control circuit for a short-range wireless device includes a diode positioned between the negative terminal of a battery and an external connector to force a logical LOW when the battery is recharging and a logical HIGH when the battery is in use by the voltage regulator of the device.

Abstract: A wireless user terminal operates in a mode that is selected based on an indication of the orientation of the wireless user terminal from a gravitational sensor in the wireless user terminal. When the wireless user terminal is in a first orientation, the wireless user terminal operates in a speakerphone mode. When the wireless user terminal is in a second orientation, the wireless user terminal operates in a handset mode. The mode of operation of the wireless user terminal transitions based on movement of the wireless user terminal from the first orientation to the second orientation. For example, when the wireless user terminal placed in a horizontal orientation, one of the speakerphone modes is selected. When the user picks up the wireless user terminal, the wireless user terminal transitions to handset mode.

Abstract: Wireless communications devices using a given speaker for both handset and speakerphone operation are equipped with a mechanical spacer that automatically inhibits the user from placing the speaker in close proximity to the user's ear when the wireless communications device is in speakerphone mode. The spacer is moved from a normal position to a blocking position to switch the device from handset to speakerphone mode. The mechanical spacer may take a variety of forms, such as an articulating antenna, a moveable frame, a moveable speaker flap, and the like. The extra space between the speaker and the user's ear mandated by the presence of the spacer allows the sound generated by the speaker in speakerphone mode to dissipate somewhat before reaching the user's ear, even when the speaker is held as close as possible, thereby automatically providing hearing protection when the wireless communications device is configured for speakerphone operation.

Abstract: A handheld voice communication system including a handheld computing device and a handset linked to the computing device via a retractable cable. The handheld computing device includes a data display screen and a microphone integrated therein, and the handset includes a speaker. The handset is movable between a retracted position, wherein at least one portion of the cable is retracted into the computing device and the handset is in contact with the computing device, and an extended position wherein at least one portion of the cable is extended out of the computing device and the handset is spaced away from the computing device. In one embodiment, the speaker is capable of high-level audio output when the handset is in the retracted position and capable of low-level audio output when the handset is in the extended position.

Abstract: A transmitter circuit for use in a mobile radio using both a normal frequency transmission band and a talk-around frequency transmission band is disclosed. The transmitter employs a local oscillator in the modulation circuit that operates at only a single frequency band characteristic. At the output of the modulation circuit, one of two transmission paths is selected by an RF switch. In the normal transmission path, the input signal is output in the normal frequency band. Alternatively, in the talk-around transmission path, the input signal is modulated to the talk-around frequency band and then output. The present circuitry eliminates the requirement for local oscillators having dual operational characteristics.

Abstract: In accordance with one embodiment of the present invention, in a wireless telecommunications system, an automatic gain control loop for a base station, comprises a demodulator having at least one output terminal. The demodulator is adapted to demodulate signals received by the base station so as to provide a plurality of phase signals via its output terminals. These phase signals correspond to the phase of the signals received by the base station. A plurality of variable-gain amplifiers are adapted to receive one of the phase signals and to change the amplitude of said phase signals. A plurality of signal processing units are adapted so as to receive signals provided by the variable amplifiers, and each of the signal processing units is further adapted to generate a feedback control signal so as to control the gain of each one of the variable-gain amplifiers.