Abstract: The frequency error of an oscillator is minimized by characterizing the operating environment of the oscillator. An electronic device monitors parameters that are determined to have an effect on the frequency accuracy of the internal frequency source. Temperature is one parameter known to have an effect on the frequency of the internal frequency source and a primary contributor to device temperature is the RF Power Amplifier (PA). The electronic device collects and stores the activity level of the PA. The effective PA duty cycle over a predetermined period of time is calculated. The LO operating environment is stabilized by operating the PA at the calculated duty cycle when the LO is required to operate in a high stability mode.

Abstract: In a communication device (100) with an earpiece (110) and a microphone (120), there is a sensor (130) relating a first connection line (105) from the earpiece (110) to the microphone (120) on a system (200, 300) which is independent of the device and of the person using it, such as the earth's gravitational field, and which selects the operating mode QUIET (1) or LOUD (2) of the communication device in accordance with this. The sensor (130) switches the communication device (100) to QUIET when the angle (230) between the connecting line (105) and the plumbline (205) of the gravitational field basically corresponds to the angle (330) between a second connecting line between the ear (310) and the mouth (320) of a person (300) who is authorized to make the call, so as to bar other persons (400) who are in the vicinity (X2) from hearing the output from the communication device loudspeaker (110).

Abstract: A method for controlling forward power utilizing 13K erasure indicator bit in a CDMA system improves the call quality and subscriber capacity by setting a nominal_gain, a maximum traffic channel gain (max_tx_gain), a minimum traffic channel gain (min_tx_gain), and a reduction rate in an optimal combination, wherein the nominal_gain is initial gain of primary traffic channel, the max_tx_gain is maximum gain of traffic channel, the min_tx_gain is minimum gain of traffic channel, and the reduction rate represents a cycle rate to decrease the digital gain by 1 for the received frames. The nominal_gain satisfies E b N o = E c I o + P .

Abstract: A method is provided for wireless communication. The method includes communicating from a first unit to a second unit a plurality of transition signals. Each of the transition signals has a sequential value. The method further includes transitioning the first unit and the second unit from a first state to a second state simultaneously based on the sequential values of the transition signals.

Abstract: A path connection control system in a CDMA mobile communication system can establish minimum but sufficient paths without causing degradation of communication quality due to delay of hand off control even during high speed travel. The path connection control system in a CDMA mobile communication system determines a radio base station to establish a path for communication with a mobile terminal by a base station control unit. The base station control unit includes means for repeatedly inputting position information of said mobile terminal, means for deriving a current position, a traveling speed and a traveling direction of said mobile terminal on the basis of repeatedly input position information of said mobile terminal, a necessary path number map of predetermining necessary path number on the basis of a contour map.

Abstract: A wireless device such as a wireless telephone includes stackable modules. Each of the modules provides an independent wireless device function. Each of the modules stacks onto and connects to at least one of the other modules. Each of the modules includes a communications contact connected to a communications contact of at least one of the other modules. Each of the modules also includes a power bus contact connected to a power bus contact of at least one of the other modules. The modules include a memory module, a flash memory module, a read only memory (ROM) module, a random access memory (RAM) module, a central processing unit (CPU) module, a display module, a keypad module, a transceiver module, a battery module, a global positioning satellite (GPS) receiver module, and the like. Each of the modules includes keying patterns to ensure that the modules are connected together in a proper order.

Abstract: Handheld radiotelephones are provided with battery packs that facilitate the transmission of a person's voice to internally mounted microphones. A radiotelephone housing end portion is provided with an aperture that is in acoustic communication with an internally mounted microphone. A passageway extends through a battery pack from a sound inlet in a front portion thereof to a sound outlet in an end portion thereof. The sound outlet is in acoustic communication with the aperture when the battery pack is removably secured to the housing end. Accordingly, the sound inlet is in acoustic communication with the microphone via the passageway.

Abstract: A method and system are provided for selecting a communication channel in a wireless communication system. The method and system include defining a plurality of channel groups. Each channel group corresponds to a plurality of communication channels. The method and system also includes setting a set counter to the channel group having the current communication channel. Further, the set counter is incremented after each channel hop and an index counter is incremented when the set counter resets. Next, a sequence number is determined as a function of the set counter and an identifier is associated with the wireless communication device. The method and system continues with determining an offset as a function of the sequence number and the index counter and determining a next communication channel as a function of the set counter and the offset.

Abstract: Methods and systems are provided which calculate a carrier to interference ratio of a channel using an approach which accounts for variations in the channel response characteristics over the estimation evaluation time period. The time variations may be taken into account by various alternative approaches including breaking the sample period into a series of sub-sample estimation windows and applying a different constant channel response estimate to each sub-sample estimation window or by applying a time varying model to the channel when generating the channel response estimate (such as a least squares error fit to a first order or higher order equation). Accordingly, the systems and methods of the present invention may provide for improved estimates of the carrier to interference ratio, particularly for channels subject to multi-path fading effects such as those which may result from movement of a mobile terminal during measurements of the channel.

Abstract: The present invention utilizes a filter that works on an algorithm that filters out multiuser and multi-path interference. The algorithm is programmed into the DSP processors of receiver handsets and base stations in cellular and multihop wireless radio networks which use the CDMA technology. It can also be implemented in hardware. Additionally, the invention works in a blind manner such that it learns without requiring training samples. The algorithm can be expressed as updating the receiver parameter vector f(n) as: f(n+1)=[I−C(CHC)−1CH][f(n)−mfy(n)yH(n)f(n)]+C(CHC)−1g(n) wherein y(n) is a data vector for each transmitted bit W1(n) from user 1, the receiver will estimate that bit by filtering y(n), i.e. w1(n)=fH(n)y(h), where H denotes Hermitian; g(n) corresponds to the multipath parameters and is updated by a separate revision; and C is a matrix constructed from elements of the desired user's spreading code.

Abstract: A method of assigning a channel to a service in a wireless communications network based on interferences levels and channel quality. Channels are preassigned and then reassigned using an algorithm that assigns a channel to a service based on uplink interference and channel quality measurements. Reassignment can be achieved in one processing pass, rather than requiring multiple iterations.

Abstract: A time diversity satellite system provides geosynchronous satellites in tundra orbits in three orbital planes. The satellites traverse a common figure-eight ground track comprising northern and southern loops. Power modes and early and late operating modes of the satellites are selectively switched to select the satellite currently traversing the northern loop be the late satellite delivering a late signal, that is, a delayed early signal, to satellite receivers. A receiver can therefore employ a relatively small buffer for storing the early satellite signal for only the selected channel in a multi-channel TDM content signal without experiencing latency problems when selecting a new channel.

Abstract: A radio back-end circuit that includes a signal processing unit which receives an intermediate frequency signal containing modulated information. The radio back-end circuit processes the intermediate signal and provides an output representative of the modulated information. The radio back-end circuit includes a plurality of control registers for receiving digital information provided external to the back-end circuit. Also included is a signal optimization circuit, coupled to the plurality of registers, having an output coupled to the signal processing unit for modifying how the radio-back-end processes the intermediate frequency signal. In addition, an analog interface, coupled to the signal processing unit, is included which converts analog information from the signal processing unit to digital processing unit information.

Abstract: A wireless telecommunications system uses location or position information to initiate actions on behalf of travelers. As position information of a wireless mobile unit is received, it is compared to stored position information of a remote location, such as a home. As the traveler approaches his home, and gets within a certain distance of home, a signal is then sent to a controller within his home to perform an action or instruct the performance of an action.