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| Number | Title | Issue Date |
| 5796776 | Code sequence generator in a CDMA modem A CDMA modem includes a modem transmitter having: a code generator which provides an associated pilot code signal and which generates a plurality of message code signals; a spreading circuit which produces a spread-spectrum message signal by combining eac... | 08/18/1998 |
| 5793814 | Transmission method for simultaneous synchronous or asynchronous transmission of K data sequences consisting of data symbols In a transmission method for simultaneous synchronous or asynchronous transmission of K data sequences consisting of data symbols, before transmission a specific signal form allocated to the data sequences is modulated on each of the data symbols of the K... | 08/11/1998 |
| 5732111 | Frequency error compensation for direct sequence spread spectrum systems A frequency error calibration, estimation and compensation device and method for direct sequence spread spectrum systems, such as digital cordless telephones having a handset and a base station. Initial frequency calibration occurs when the handset is phy... | 03/24/1998 |
| 5727064 | Cryptographic system for wireless communications A wireless communications system (110) with increased privacy. The system (110) transmits an encrypted signal between a base station (112) and a wireless terminal (122). In the forward channel, the base station (112) includes an encryptor (130) with a non... | 03/10/1998 |
| 5722074 | Soft handoff in a cellular telecommunications system A soft handoff in a cellular telecommunications system in which a user mobile station relays user communication radio signals via at least two base stations to and from a controlling mobile exchange connected to another system user. The relay of user info... | 02/24/1998 |
| 5706428 | Multirate wireless data communication system A wireless LAN includes first stations adapted to operate at a 1 or a 2 Mbps data rate and second stations adapted to operate at a 1,2,5 or 8 Mbps data rate. The 1 and 2 Mbps rates use DBPSK and DQPSK modulation, respectively. The 5 and 8 Mbps rates use P... | 01/06/1998 |
| 5703902 | Method and apparatus for determining signal strength in a variable data rate system A method and apparatus of determining signal strength, regardless of the signal data rate, in a receiver receiving signals from a variable rate transmitter. The incoming signal is comprised of a series of frames. Each frame is comprised of a number of pow... | 12/30/1997 |
| 5631922 | Spread code generation device for spread spectrum communication There is disclosed a spread code generation device for spread spectrum communication wherein an input data is modulated so as to be spread by a spread code having a first period. The device includes a long period PN code generator for generating a spread ... | 05/20/1997 |
| 5621723 | Power control in a CDMA network A means of power control on the reverse link of a CDMA network is disclosed. Specifically, the forward link from the base station to the subscriber unit is used to direct the subscriber unit to modify the output power radiated. The forward link consists o... | 04/15/1997 |
| 5583852 | Wireless data communication system A wireless data communication system comprises: base stations located to have cells arranged equidistantly therebetween; mobile units, each being located within either of the cells, each of the base stations communicating with mobile units within its cell... | 12/10/1996 |
| 5570349 | Wireless direct sequence spread spectrum digital cellular telephone system The present invention is based on novel implementation techniques which makes orthogonal CDMA practical in a short range mobile telephone environment where significant multipath fading exists. Specifically, this invention provides novel techniques for est... | 10/29/1996 |
| 5528596 | Telecommunications systems A method for marshalling an additional outstation (3) of a time division multiple access (TDMA) telecommunications system including a basestation (4) and a plurality of outstations (1, 2), such as a passive optical network (PON). A sequence is transmitted... | 06/18/1996 |
| 5446757 | Code-division-multiple-access-system based on M-ary pulse-position modulated direct-sequence A BPSK-MPP-DS-CDMA system is devised using a pulse position modulated direct sequence technique. Under the same bandwidth, same energy used for one decision, and same bit error rate conditions, if the number of users is less than the period Ncp... | 08/29/1995 |
| 5444710 | Telecommunications systems A method for marshalling an additional outstation (3) of a time division multiple access (TDMA) telecommunication system including a basestation (4) and a plurality of outstations (1,2), such as a passive optical network (PON). A sequence is transmitted f... | 08/22/1995 |
| 5438596 | Method and apparatus for generating diffusion code A method and apparatus for generating the PN code employed for spread spectrum communication are disclosed. Maximal period sequence signals from a maximal period sequence generator 11 and shift vector from a shift vector outputting circuit 10 are transmit... | 08/01/1995 |
| 5418813 | Method and apparatus for creating a composite waveform A method and apparatus is provided for creating a composite waveform. This composite waveform is created by coding a plurality of input digital information signals. Subsequently, the plurality of coded input digital information signals are communicated ov... | 05/23/1995 |
| 5404376 | Navigation assistance for call handling in mobile telephone systems In a mobile radio telephone system employing TDMA or CDMA, mobile units often must determine the timing and appropriate power necessary for transmissions to a base station. Information broadcast by base stations allows the mobile station to approximate it... | 04/04/1995 |
| 5367533 | Dynamic capacity allocation CDMA spread spectrum communications A dynamic capacity allocation spread spectrum CDMA communications system for overlaying, at least in part, geographically and in frequency a radio-relay system. A first receiver, located near the relay receiver of the radio-relay system, measures a first ... | 11/22/1994 |
| 5363404 | Apparatus and method for conveying information in a communication network A direct sequence code-division multiple access (DS CDMA) communication system schedules conveyance of blocks (400) of information such that the blocks arrive at a base-site (130) just-in-time for transmission during a discrete frame (301-305) of an air-i... | 11/08/1994 |
| 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 |
| 5206882 | System for and method of creating and assigning address codes in a cellular spread spectrum system A system and method for developing and assigning address codes in a radiotelephone communication system using spread spectrum modulation techniques based upon an analysis of signal strength and without reference to a geographic pattern.... | 04/27/1993 |
| 5170412 | Multiple access method In a multiple access method for the simultaneous exchange of several data streams ({B1,m }, {B2,m }, {B3,m }) among several participants of a transmission system, various data streams ({B1,m }, {B2,m ... | 12/08/1992 |
| 5164958 | Spread spectrum cellular handoff method A method for handling off a transitioning-remote unit from a first microcell having a first base station communicating with a first plurality of remote units, to a second microcell having a second base station communicating with a second plurality of remo... | 11/17/1992 |
| 5157687 | Packet data communication network A packet data transmission system is used to link a number of remote hand-held data-gathering units such as bar code readers to a central computer which maintains a database management system. Data packets are sent from the remote units by an RF link to i... | 10/20/1992 |
| 5042050 | Digital cordless telephone systems A digital cordless telephone system which comprises a primary station (PS) controlled by a system controller (14 or 15) and a plurality of secondary stations (SS) capable of communicating with the primary station by way of a time division duplex radio lin... | 08/20/1991 |
| 5003552 | Carrier aided code tracking loop A fast acquisition coherent code tracking loop for use in direct sequence spread spectrum systems is provided with an embedded frequency offset loop. The frequency offset loop in the code tracking loop is provided with a pair of multipliers, one of which ... | 03/26/1991 |
| 4977578 | Spread spectrum communication system A spread spectrum communication system having a modulation unit for modulating and spreading an information signal by one or more of carrier signals and a spread code and transmitting it as a radio wave, and a demodulation unit for despreading and demodul... | 12/11/1990 |
