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| Number | Title | Issue Date |
| 6101179 | Accurate open loop power control in a code division multiple access communication system A method and system for open loop power control in a CDMA communication system. The method and system controls the power of a mobile station transmission signal in a CDMA communication system having a base station which transmits a pilot signal. The metho... | 08/08/2000 |
| 5835065 | Variable length whip with helix antenna system An antenna system for a communication device. A whip antenna is surrounded by a helical antenna. A switch couples the helical antenna to the signal source when the whip antenna is in a retracted position. The whip antenna is comprised of an upper conducti... | 11/10/1998 |
| 5818871 | Method for providing service and rate negotiation in a mobile communication sytstem A method and apparatus for negotiating service configuration in a digital communication system is disclosed. In an exemplary embodiment the service negotiation system is implemented in a wireless spread spectrum communication system. The service configura... | 10/06/1998 |
| 5812607 | Method and apparatus for processing wideband data in a digital cellular communication system A system and method for processing wideband data within digital FM transceiver. A digital FM demodulator within the transceiver produces a demodulated information signal in response to the FM signal. The digital FM receiver also includes a wideband messag... | 09/22/1998 |
| 5812097 | Dual band antenna A novel and improved dual band antenna system comprising an inner antenna element surrounded by an outer antenna element. In a first embodiment, the inner antenna element radiates and receives RF signals in a first RF band, and the outer antenna element r... | 09/22/1998 |
| 5812938 | Reverse link, closed loop power control in a code division multiple access system The process of the present invention enables a mobile radiotelephone to operate at a 100% duty cycle while providing closed loop power control. The base station measures the signal to noise ratio of the signal from the mobile and compares that SNR with th... | 09/22/1998 |
| 5805843 | Microprocessor bus interface unit for interfacing an N-bit microprocessor bus to an M-bit memory device A bus interface unit disposed for incorporation within a microprocessor system having a local microprocessor bus, a memory unit, and a system bus coupled to the memory unit is disclosed herein. The bus interface unit includes a bus control unit having an ... | 09/08/1998 |
| 5799005 | System and method for determining received pilot power and path loss in a CDMA communication system A system and method for estimating the quality and path loss associated with a communications channel on the basis of the power of a pilot signal received by a communications receiver. The communications receiver measures a received signal power, and also... | 08/25/1998 |
| 5781543 | Power-efficient acquisition of a CDMA pilot signal A system and method for acquiring a code division multiple access (CDMA) pilot signal having a pilot pseudonoise (PN) code offset in a CDMA communication system. A received signal is correlated with a first set of PN code offset hypotheses. If this first ... | 07/14/1998 |
| 5778024 | Dual-mode communications processor A dual-mode communications processor disposed to be incorporated within a dual-mode communications device is disclosed herein. The dual-mode communications processor comprises a dual-mode voiceband signal processor having an input port for receiving digit... | 07/07/1998 |
| 5758266 | Multiple frequency communication device The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixin... | 05/26/1998 |
| 5757239 | Direct digital synthesizer driven phase lock loop frequency synthesizer with clean up phase lock loop A frequency synthesizer which uses a direct digital synthesizer (DDS) to generate a highly accurate periodic signal of a frequency selected from a plurality of reference frequencies. The DDS output signal is bandpass filtered utilizing a clean-up phase lo... | 05/26/1998 |
| 5757858 | Dual-mode digital FM communication system A dual-mode digital communication system for communicating an information signal during operation in frequency-modulated (FM) and multiple-access modes is disclosed herein. The digital communication system includes a dual-mode transmitter for transmitting... | 05/26/1998 |
| 5754542 | Method and apparatus for system determination in a multi-mode subscriber station A method and apparatus for selecting a communication system in a multi-mode subscriber station. In the exemplary embodiment, the subscriber station capable of operating in both CDMA and analog modes comprises a analog modulation and demodulation and proce... | 05/19/1998 |
| 5748104 | Wireless remote telemetry system A wireless remote telemetry system which uses low-cost remote communication devices operating on existing wireless communication systems in order to provide real-time reading and control of remote devices. In an embodiment applicable to utility service, c... | 05/05/1998 |
| 5732341 | Method and apparatus for increasing receiver immunity to interference The process of the present invention adjusts the input gain by a predetermined amount. The receiver processing measures the gain change in the IF sisal power. If the change is less than the predetermined amount, the CDMA signal and jammers are below the n... | 03/24/1998 |
| 5722061 | Method and apparatus for increasing receiver immunity to interference A method for adjusting the gain of a receive circuit, thereby improving a receiver's immunity to interference. The circuit has an LNA which amplifies the received signal. The receive signal power is controlled by enabling or disabling the LNA in response ... | 02/24/1998 |
| 5722053 | Multiple frequency communication device The dual band code division multiple access radio of the present invention operates on multiple frequencies simultaneously on either transmit or receive. The transmit path operates by splitting the transmit intermediate frequency (IF) path (103) and mixin... | 02/24/1998 |
| 5722063 | Method and apparatus for increasing receiver immunity to interference The method and apparatus of the present invention improve the immunity to interference of a radio receiver. The power level of a received signal is detected. If the power level meets or exceeds a predetermined power threshold, the low noise amplifier is b... | 02/24/1998 |
| 5708448 | Double helix antenna system A double helix antenna comprised of orthogonally-wound helix conductors is disclosed. The double helix antenna system includes a first helix conductor wound in a first direction about a vertical axis of the double helix antenna. A second helix conductor i... | 01/13/1998 |
| 5673259 | Random access communications channel for data services In a digital communication system for communicating digital information, the digital communication system having a forward link and a reverse link, a system and method for communicating a data packet. The system comprises a communicating transceiver, from... | 09/30/1997 |
| 5655220 | Reverse link, transmit power correction and limitation in a radiotelephone system The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specifi... | 08/05/1997 |
| 5652599 | Dual-band antenna system A dual-band antenna system for use in a portable communications device is disclosed herein. The antenna system includes an antenna element for radiating electromagnetic energy within low-band and high-band wavelength ranges. In a preferred embodiment, a l... | 07/29/1997 |
| 5627857 | Linearized digital automatic gain control The present invention provides linear, digital automatic gain control (AGC) in a radio. A received signal is demodulated to provide I and Q digital baseband signals. A received signal strength indication is determined from these signals and the resulting ... | 05/06/1997 |
| 5617060 | Method and apparatus for automatic gain control and DC offset cancellation in quadrature receiver An automatic gain control (AGC) and D.C. offset correction method and apparatus for controlling signal power of a received RF signal within a dual mode quadrature receiver is disclosed herein. In a preferred implementation the automatic gain control appar... | 04/01/1997 |
| 5604730 | Remote transmitter power control in a contention based multiple access system The power control process of the present invention enables a base station communicating over a forward packet channel to a mobile radio to control the power of the mobile radio transmitting over a reverse packet channel to the base station. The base stati... | 02/18/1997 |
| 5603096 | Reverse link, closed loop power control in a code division multiple access system The process of the present invention enables a mobile radiotelephone to operate at a 100% duty cycle while providing closed loop power control. The base station measures the signal to noise ratio of the signal from the mobile and compares that SNR with th... | 02/11/1997 |
| 5590408 | Reverse link, transmit power correction and limitation in a radiotelephone system The process and apparatus of the present invention limits the output power of a radiotelephone, operating in a cellular system in the preferred embodiment. This ensures the transmitted sidebands and synthesizer phase noise remains within a certain specifi... | 12/31/1996 |
| 5574987 | Antenna switching apparatus The antenna switch of the present invention switches from a portable radio's internal antenna to an external, vehicle adapter antenna. The second antenna is part of the vehicle adapter that supplies DC power to the vehicle adapter. A 1/4-wavelength transf... | 11/12/1996 |
| 5566357 | Power reduction in a cellular radiotelephone The filter of the present invention pre-processes signaling messages transmitted by the base station while the radiotelephone is in the idle mode. The radiotelephone informs the filter of the roam status and idle status and identity of the radiotelephone.... | 10/15/1996 |
| 5564083 | Antenna element mounting in a radio The antenna element mounting of the present invention enables an antenna to be mounted between the printed circuit boards of a radio instead of along side the boards. The shielding of the printed circuit boards has an indentation along one edge of each sh... | 10/08/1996 |
| 5559865 | Airborne radiotelephone communications system The airborne communication system enables one or more radiotelephones to communicate with a ground based cellular radiotelephone system. In the preferred embodiment, the aircraft is equipped with a repeater that relays a signal from the airborne radiotele... | 09/24/1996 |
| 5530928 | Balanced dual mode mixer apparatus A balanced mixer is used as a switch. In digital mode, the balanced mixer receives a digital mode analog waveform and a local oscillator (L.O.). The balanced mixer mixes the waveform and the L.O. to provide a resultant output signal. In analog mode, the L... | 06/25/1996 |
| 5499280 | Clock signal generation The clock signal generator of the present invention divides a higher frequency clock down to a frequency that is an uneven sub-multiple of the higher frequency. The input clock to be divided down clocks an 11-bit counter (105-110) that outputs an overflow... | 03/12/1996 |
