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| Number | Title | Issue Date |
| 5732352 | Method and apparatus for performing handoff in a wireless communication system A method including the steps of performing a synchronization measurement of a received signal (102), and performing a handoff (110) between a first communication channel and a second communication channel in response to the synchronization measurement. An... | 03/24/1998 |
| 5687189 | Method of noise reduction for an ADPCM signal Noise in an ADPCM signal is muted or suppressed by modifying the magnitude of the ADPCM information during noisy conditions. In one method, the ADPCM data is changed to a predetermined magnitude value. In another method, the magnitude is reduced by a pred... | 11/11/1997 |
| 5678208 | Transmission system A remote power measuring device (1) is used to measure the power output of the transmission system (20). The measured power is then transmitted to a controller (5) and used by the controller (5), along with preset calibration data (41) for each power ampl... | 10/14/1997 |
| 5678187 | Method and apparatus for reducing interference in a radio communication link of a cellular communication system A method and apparatus is provided for reducing interference in a radio communication link from a central site (230) to a mobile unit (228) in a cellular communication system. The central site (230) includes a first (202) and a second (216) antenna which ... | 10/14/1997 |
| 5668875 | Method and apparatus for authentication in a communication system A method and apparatus for authenticating a roaming subscriber. In a preferred embodiment, a subscriber receives a challenge that is in a format of a local authentication protocol, and determines whether the local authentication protocol is the subseriber... | 09/16/1997 |
| 5649299 | Apparatus and method for adapting a digital radiotelephone system to increased subscriber traffic A digital radiotelephone system employs vocoders to convert between analog speech and a digital format suitable for transmission via radio. Under most circumstances, the highest data rate is selected for optimum audio quality. When the system occupancy ex... | 07/15/1997 |
| 5640676 | Method for generating a handoff candidate list In a cellular communication system (40) a handoff candidate list is generated for a source sector (51) by eliminating (12) from a list of potential handoff candidates (52-56) any sectors having an interference parameter exceeding a threshold value. The li... | 06/17/1997 |
| 5629934 | Power control for CDMA communication systems A transmitter transmits the desired signal using a continuous duty cycle at transmission rates of less than full rate (FIG. 6 ). The energy used in each power control group is related to the transmission rate. By repeating the power control groups, time d... | 05/13/1997 |
| 5627880 | MAHO method for SFH-CDMA/TDMA using punctured frames In a frequency hopping cellular communication system (40) having a number of base sites (41-48) and using mobile assisted handoff, a method is offered of providing base site identification signals. The method includes the steps of assigning each base site... | 05/06/1997 |
| 5594757 | Method and apparatus for digital automatic frequency control A method and apparatus for digital automatic frequency control includes circuitry for frequency controlling a first information portion of a digital input signal, correlating the output with a known characteristic of the first information portion, and out... | 01/14/1997 |
| 5583886 | Method for determining a plurality of channel responses and modifying a received signal therewith Each of a plurality of transmitters (31-37) transmits (62) one of a plurality of known signals. The known signals being known to a receiver (40). The receiver (40) then measures the known signals (63); and using those measurements, estimates the plurality... | 12/10/1996 |
| 5559832 | Method and apparatus for maintaining convergence within an ADPCM communication system during discontinuous transmission An information gap in an ADPCM signal is detected in one or both of a transmitter or receiver. This detection can be accomplished using a voice activity detector. When an information gap is detected, a clock signal to the encoder and/or decoder is interru... | 09/24/1996 |
| 5548808 | Method for performing a handoff in a communication system The power of a first signal is measured and is compared with a threshold. If the first signal power meets a handoff threshold, the system enters the handoff procedure. Once in the handoff procedure, estimates of a first signal quality a signal would have,... | 08/20/1996 |
| 5530926 | Method for operating a switched diversity RF receiver One of two antennas (11, 12) is selected (34) by comparing the quality of a first signal (32) preceding a desired signal, received through a first antenna (11), with the quality of a second signal (33) preceding the desired signal, received through the se... | 06/25/1996 |
| 5519779 | Method and apparatus for inserting signaling in a communication system Signaling is inserted (102) into a communication channel of a communication system by inserting the signaling into the communication channel if the communication channel has sufficient available bandwidth (104). If the communication channel does not have ... | 05/21/1996 |
| 5519888 | Receiver incorporating an other users noise simulator (OUNS) for use in a communication system A received signal is provided to an automatic gain controller which normalizes the received signal to a known voltage level. The automatic gain controller is also provided with an OUNS noise signal through a voltage controlled attenuator. The voltage cont... | 05/21/1996 |
| 5502751 | Digital phase locked loop A digital oscillator is synchronized to a master clock by comparing the master clock to an output of the digital oscillator by providing both to a first register which enables a counter. The counter increments while enabled until cleared. The output of th... | 03/26/1996 |
| 5491717 | Method for controlling transmission during handoff in a communication system Transmission is controlled using the present method after a handoff procedure has been entered between a subscriber unit and target transceivers. During this process, a communication link between the subscriber and at least one other transceiver is mainta... | 02/13/1996 |
| 5475861 | Method for controlling transmission power in a communication system The transmit power margin of frame error rate for each subscriber in the system is measured to determine if any "bad" subscribers, those subscribers with transmit power margins of frame error rates that cross a threshold, are in the system. If the system ... | 12/12/1995 |
| 5471649 | Base station transceiver diagnostic equipment Base Station Transceiver Equipment 10 is provided such as for use in a cellular radio telephone system. In a first aspect of the invention, a device within the equipment measures a parameter (e.g. timing, signal strength) of a mobile transceiver and instr... | 11/28/1995 |
| 5438569 | Transcoder A transcoder is described for performing transcoding operations, that is to say coding and decoding operations on voice data arranged over a plurality of voice data channels. It comprises a first interface (10) for inputting and outputting coded voice dat... | 08/01/1995 |
| 5418835 | Method of delivering paging messages using voice mail In a cellular communication system, the delivery of a page or message is attempted over the system to a user of the system. If the page or message is undeliverable before a set period of time, the page or message is converted to a voice mail message. The ... | 05/23/1995 |
| 5412375 | Method of selecting an air interface for communication in a communication system In a communication system having a plurality of air interfaces, one of the air interfaces is assigned for use for a desired communication by transmitting a message, having a list of air interface capabilities of the subscriber, from the subscriber to a ba... | 05/02/1995 |
| 5406585 | Method and apparatus for trellis decoding in a multiple-access system A method is provided of discerning a signal of a desired user on a channel having a desired user and a plurality of interfering users, each, upon occasion, transmitting an identifiable, known pilot symbol. The method includes the steps of determining a ch... | 04/11/1995 |
| 5394561 | Networked satellite and terrestrial cellular radiotelephone systems There is provided a mechanism for networking satellite and terrestrial networks. It comprises: maintaining subscriber-received power levels of terrestrial network transmissions about one order of magnitude above co-channel satellite transmissions to overc... | 02/28/1995 |
| 5390166 | Method for recovering a data signal using diversity in a radio frequency, time division multiple access communication system In a time division multiple access (TDMA) system (10), a method (50, 60) of recovering a data signal of a transmission burst commences by obtaining the frequency transmission codes for the transmitters to be monitored (52, 62). The data signal is then rec... | 02/14/1995 |
| 5384547 | Apparatus and method for attenuating a multicarrier input signal of a linear device The apparatus first measures the peak power of a multichannel signal, or representation thereof. The peak power is compared with one or more peak power threshold values. If the measured peak power exceeds a threshold value, the multichannel signal is atte... | 01/24/1995 |
| 5375007 | Optical distribution system A downlink portion consists of a multiplexer for combining several signals. The combined signal is converted to an optical signal by a laser and transmitted over an optical line to a splitter. The split signals are each transmitted to a detector which con... | 12/20/1994 |
| 5369644 | Method for testing a communication system using canned speech A system is tested by providing a canned speed signal (a signal containing known speech) from a diagnostic controller to an encoder of the communication system. The canned signal is encoded forming an encoded canned speech signal. The encoded signal is tr... | 11/29/1994 |
| 5339337 | Permuted block synchronization There is provided a mechanism for block synchronization. It comprises: predeterminally arranging synchronization words about a point of interest, transmitting such arrangement, receiving that transmission having synchronization words predeterminally arran... | 08/16/1994 |
| 5327572 | Networked satellite and terrestrial cellular radiotelephone systems There is provided a mechanism for networking satellite and terrestrial networks. It comprises: maintaining subscriber-received power levels of terrestrial network transmissions about one order of magnitude above co-channel satellite transmissions to overc... | 07/05/1994 |
| 5305468 | Power control method for use in a communication system The power of a received signal is measured at a base station. This measured power is used to predict a future power level of the received signal and from that to determine the appropriate power adjustment command. The power adjustment command is then sent... | 04/19/1994 |
| 5301056 | Optical distribution system A downlink portion consists of a multiplexer for combining several signals. The combined signal is converted to an optical signal by a laser and transmitted over an optical line to a splitter. The split signals are each transmitted to a detector which con... | 04/05/1994 |
| 5291475 | Slot hopped FD/TD/CDMA In a wireless frequency and time division multiple access (FD/TDMA) communications system having time-slotted communications channels, there is provided a method of and apparatus for hopping wireless communications. It comprises sequencing slot assignment... | 03/01/1994 |
| 5271042 | Soft decision decoding with channel equalization In a communications network having time-dispersed signals, there is provided a mechanism for soft decision decoding. It comprises: radio reception of a time-dispersed signal, at least partly equalizing those time-dispersal effects, recovering information ... | 12/14/1993 |
| 5245629 | Method for compensating for capacity overload in a spread spectrum communication system A method for compensating for capacity overload in a communication system by first determining the received signal power level at a base site is described. The power level is compared with a threshold power level. If the received power level is greater th... | 09/14/1993 |
| 5226058 | Spread spectrum data processor clock A noise signal is obtained from a data processor output, such as a data line, an address line, or a control line, and used to control the frequency modulation of an oscillator. The modulated output is used to clock the data processor.... | 07/06/1993 |
| 5222141 | Apparatus and method for encoding data A first bit of the communication signal is encrypted and forwarded to a CRC where it is processed in parallel with the encryption of the second bit. The first bit is then passed to the scrambler and the second bit is passed to the CRC where they are proce... | 06/22/1993 |
| 5210771 | Multiple user spread-spectrum communication system A communication system having a site employing a plurality of communication channels. Each channel is assigned a desired received signal strength threshold. A channel is assigned to a subscriber unit based upon the strength of the signal received at the s... | 05/11/1993 |
| 5030952 | Sigma-delta type analog to digital converter with trimmed output and feedback An analog signal is input to a converter where a feedback signal is subtracted to form an analog error signal. The analog error signal is then processed through a first quantizer to provide a course output bit. The difference between the input and output ... | 07/09/1991 |
