Abstract: The present invention relates generally to communications, and more specifically to a method and apparatus for minimizing DC offset and second-order modulation products (IM2 noise) while demodulating RF signals. The principle of the invention can be applied to differential, down-conversion circuits (50) consisting of two differential mixers (54, 56) in series, a follows: a pair of current sources Ia and Ib are used to provide current to positive and negative channels of the first differential mixer (54). Providing current to the amplifying transistors of the first mixer (54) reduces the current drawn through the active mixer switches, reducing the noise generated. The current sources 1a and 1b are trimmed in a complementary manner where 1a=I+Delta1, and 1b=Delta1. The value of ?1 can be determined in a number of manners; for example, it could be established by testing after the circuit has been fabricated, and the value stored on-chip, for future use.

Abstract: A wireless communication system wherein wireless infrastructure adapts access parameters and manages channel resources based on detailed reconnection information obtained from individual mobile stations. Mobile stations transmit particular reconnection attempt status information to the wireless infrastructure. The reconnection attempt status information, along with the aggregate statistics of other mobile stations, is used by the infrastructure to adapt access parameters to increase or decrease the likelihood of successful access. This allows the infrastructure to tune access parameters to particular mobile station information and it also allows the infrastructure to provide better resource management for both traffic channel assignments and access channel usage.

Abstract: Methods and apparatuses for determining a position of a mobile satellite positioning system (SPS) receiver which is coupled to a communication receiver or transceiver. In one exemplary method, a change in a communication signal received by the communication receiver is determined. A parameter, based on the change, is determined, and SPS signals from SPS satellites are processed according to the parameter. According to further details of this method, the change involves the fluctuation of the level of the communication signal and the parameter is a motion information which specifies a frequency range for searching for SPS signals in the process of acquiring the SPS signals from SPS satellites. In an alternative embodiment the change in the communication signal is a change in the transmitted signal in response to power control commands. Apparatuses, such as a mobile communication system which includes an SPS receiver and a communication receiver, are also described.

Abstract: The receiver is provided which comprises a mixer, a low pass filter coupled to the mixer and a plurality of gain controllers serially coupled to an output of the low pass filter (LPF). A plurality of analog-to-digital converters (ADCs) is coupled so that an input of a first of the ADCs is coupled to the output of the LPF. An input of each of a remaining portion of the ADCs is individually coupled to a corresponding output of each of the serially coupled gain blocks. An output path traced from the output of the LPF to an output of each of the analog-to-digital converters may be referred to as a processing path. Each processing path may comprise a gain controller and an ADC, except for the first processing path, which may have an ADC coupled directly to the output of the LPF.

Abstract: During all or part of a time period during which pattern signals are received, a diversity receiving apparatus allows a gain control section to fix the gain of a gain amplifier section, allows an antenna switching section to sequentially switch the selection of antennas during antenna switching periods which are synchronized with averaging periods, and determines an antenna to receive data contained in a packet, based on the levels of average powers measured by an averaging section on an averaging period-by-averaging period basis.

Abstract: A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted from a power amplification circuit, and designed to be capable of performing transmission using a GMSK modulation mode and transmission using an 8-PSK modulation mode. In the transmitter, the phase control loop is shared as a phase control loop for use in the GMSK modulation mode and a phase control loop for use in the 8-PSK modulation mode. A component similar to any one of components constituting a loop filter is provided in parallel therewith so that the component can be connected or disconnected in accordance with the modulation mode, for example, by use of a switching element.

Abstract: A folder type cellular phone and an automatic folder method includes a main body having a key pad and a hinge thereof in a first direction, a folder having a display, a driving source disposed on a lower portion of the folder in the first direction to generate a driving force, a power transmission unit having one end coupled to the driving source and the other end coupled to the folder to transmit the driving force to folder to rotate with respect to the main body when the folder is in an open state, and a rotation controller coupled to the power transmission unit and disposed in a housing installed at the hinge of the main body in a second direction perpendicular to the first direction to automatically and/or manually rotate the folder with respect to the main body.

Abstract: Mobile station equipment, base station equipment, and an exchange equipped with all or some units for monitoring the speed of a mobile station, making a judgment whether or not the speed exceeds a given threshold value, and restricting both or at least one of channel control and call processing regarding a call occurring at the corresponding mobile station. These mobile station equipment, base station equipment, and exchange operate alone or associate with each other through radio transmission paths or other links. Further a mobile communication system may include these mobile station equipment, base station equipment, and exchange. In the above equipment exchange, accidents normally caused by some operation of an operator on the mobile station equipment in response to a call occurring in the mobile station equipment moving at a high speed are prevented efficiently and reliably.

Abstract: A method includes communicating a first signal at a transmitter. The first signal has a first frequency. The method also includes receiving a second signal at a receiver. The second signal has a second frequency, and the second signal comprises the first signal converted from the first frequency to the second frequency. In addition, the method includes determining whether the transmitter and receiver are functional using at least one of the first and second signals.

Abstract: An antenna steering algorithm for a smart antenna uses signal quality metrics and link quality metrics for selecting a preferred antenna beam. The link quality metrics supplement the signal quality metrics for improving the antenna steering decision. The link quality metrics are based on information available from existing counters operating in the media access control (MAC) layer. Separate estimates of the frame error rates in the receive links and in the transmit links are obtained. One estimate is the downlink quality metric (DLQM) and another estimate is the uplink quality metric (ULQM). Alternative link quality metrics are based on throughput and data rates of the exchanged data.

Abstract: A receiver includes a processor and an RF bridge. The RF bridge is coupled to the processor to receive a reference signal from the processor. The RF bridge includes first and second frequency converters coupled to respective first and second antennas. The RF bridge also includes a third frequency converter coupled to outputs of the first and second frequency converters. In an alternative receiver the processor is coupled to receive an information signal from the RF bridge. The processor includes a digital frequency source to generate the reference signal based on a signal from a clock source and circuitry to detect a frequency difference from the information signal based on the signal from the clock source. In a variant, the circuitry to detect includes a first Fourier transformer having a first center frequency and a second Fourier transformer having a second center frequency different than the first center frequency.

Abstract: An integrated circuit comprises an ESD protection circuit including an inductor coupled between an input terminal and a ground terminal at which an RF signal is applied. The inductor is designed so as to provide a sufficient current capability required in typical ESD events. Moreover, the inductance of the inductor is selected to define, in combination with any parasitic capacitance present, a resonance tank with a resonant frequency that is matched to the RF signal. Accordingly, the operating frequency of the integrated circuit is not limited by the ESD protection circuit. In a further embodiment, an output terminal is ESD protected by an inductor that is coupled to an auxiliary voltage serving to bias an output transistor. Moreover, clamping elements, such as diodes, are provided between the auxiliary voltage and the supply voltage and between the auxiliary voltage and ground potential.

Abstract: A switch circuit for switching the connection of the receiving or transmitting circuits of two communication systems to an antenna circuit, which comprises first and second switch means having two switching elements, the first switch means comprising a first inductance element between a port connected to the antenna circuit and a port connected to the second switch means; the second switch means comprising a second inductance element between a port connected to the first switch means and a port connected to a receiving circuit of a first communication system, and a transmission line constituting the first inductance element having a lower characteristic impedance than that of a transmission line constituting the second inductance element.

Abstract: A kind of pen-type mobile telephone. It comprises: housing (1), display (2), button (3, 4, 5), telephone receiver (6), earphone (7), etc. It is characterized in that said pen-type mobile telephone's housing possesses slender rod-form; said display (2) is slender and in longitudinal setting; In said housing (1), also included are: printed circuit board (11), radio frequency module (12), fundamental frequency module (13), and SIM card plug & receptacle (14); said printed circuit board (11) uses more than 6 layer printed circuit board, with its width less than the width of the housing (1); widths of said radio frequency module (12) and fundamental frequency module (13) are also less than the width of the housing; socket (9) inserted with SIM card plug & receptacle is set at the side face of said housing (1), and said SIM card plug & receptacle (14) uses drawer-type SIM plug receptacle. The volume of said housing (1) is less than: length 140 mm×width 35 mm×thickness 23 mm.

Abstract: A cellular communications network comprises a plurality of gateways for controlling cells in the cellular communications network, the gateways being arranged to receive RF information from at least one mobile station in the network, at least one gatekeeper connected to said gateways by a switched packet communication path, wherein each gateway includes means for generating a handover required indication for a call in which the gateway is engaged and packet generating means for generating a packet addressed to said gatekeeper and including control information comprising a candidate list of alternative cells to which the call could possibly be transferred and wherein the gatekeeper includes packet generating means for generating a packet for sending a handover request for handing over the call to one of said alternative cells.

Abstract: A transmitter and method to output a stable output signal having low distortion by adjusting a delay time of an amplitude signal path and a phase signal path. In an amplitude phase extracting part, amplitude data and phase data are extracted from a transmit data signal and outputted. The amplitude of the amplitude data is modulated in an amplitude modulating part and an amplitude modulating signal is outputted; the phase of the phase data is modulated and a phase modulating signal is outputted. In a non-linear amplifying part, the phase modulating signal is multiplied by the amplitude modulating signal to output an RF signal with a prescribed gain amplified. A delay part provided in a pre-stage of the amplitude modulating part and a delay part provided in a pre-stage of the phase modulating part, respectively, adjusts the delay time of an amplitude signal path and a phase signal path.

Abstract: A transmission weight vector computing unit computes transmission weight vectors. A transmission weight vector correcting unit obtains a corrected transmission weight vector W?(t). A predicted receiving power computing unit computes a predicted receiving power value Y(t). If a difference between the predicted receiving power value Y(t) and a predicted receiving power value in the past Y(t-T) is less than a threshold value, an update unit selects the corrected transmission weight vector W?(t). If, on the other hand, the difference is greater or equal to the threshold value, the update unit selects a corrected weight vector in the past W?(t-xT). If the modulation method is QPSK, a setting unit selects the transmission weight vector W(t). If the modulation method is 16 QAM, the setting unit selects the corrected transmission weight vector W?(t) or W?(t-xT) and outputs it as a final transmission weight vector signal.

Abstract: Disclosed is a UE and a method to operate the UE in the Site Selection Diversity Transmit mode. The method includes detecting a case where no base station is transmitting to the UE; inserting predetermined values into a received signal; and decoding the predetermined values. The predetermined values preferably correspond to zero bits.

Abstract: This invention relates to a cellular radio telephone set having a USB peripheral circuit which realizes a USB connection function. When the cellular radio telephone set is connected to an information processing terminal apparatus via a USB cable, a voltage Vbus supplied from the information processing terminal apparatus is regulated and supplied to the USB peripheral circuit. When the cellular radio telephone set is not connected to the information processing terminal apparatus via the USB cable, an application CPU which controls the USB peripheral circuit is shifted to a sleep mode.

Abstract: A multimode wireless receiver circuit (10) includes multi-receiver control and interference detection logic (50) and least two separate receivers: a first receiver (20) associated with a first radio access technology and a second receiver (30) associated with a second radio access technology. The multi-receiver control and interference detection logic (50) simultaneously controls the second receiver (30) to detect an interference blocker signal (100), while the first receiver (20) receives at least a portion of the wireless signal (80) and the interference product signal (90). In response to the second receiver (30) detecting the interference blocker signal (100), the multi-receiver control and interference detection logic (50) adjusts at least one operating condition of the first receiver (20) such that the interference product signal (90) received by the first receiver (20) is reduced.