US Patent No: 5,177,765

Number of patents in Portfolio can not be more than 2000

Direct-sequence spread-spectrum digital signal acquisition and tracking system and method therefor

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A system and method of driect-sequence spread-spectrum TDMA (or TDD) digital communication, wherein acquisition and tracking occurs for a plurality of frames having a predetermined number of time slots. One of the predetermined number of time slots in each frame is assigned for acquisition purposes and carries acquisition and sync digital information. The remaining time slots in each frame have assigned header bytes for tracking purposes. The assigned acquisition time slot is spread with an acquisition direct-sequence spreading code. The remaining time slots are spread with a communication direct-sequence spreading code. During acquisition, the signal strength in each successive time slot for each spread frame is measured for a given number of time frames. The peak is located within the given number of time frames through a major acquistion sweep and a refinement sweep. The major acquisition sweep and refinement acquisition sweep locate the frame and time slot boundaries of the transmitted signal. Once acquired, tracking occurs during the header bytes of each successive remaining time slot. Acquisition, tracking and demodulation of the digital data is performed with the same circuitry.

Loading the Abstract Image... loading....

First Claim

See full text

all claims..

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
SPECTRALINK CORPORATIONBOULDER, CO17

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bliss, Gary L Westminster, CO 7 463
Holland, Bruce M Boulder, CO 3 329

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ALCATEL N.V. (1)
4,587,662 TDMA spread-spectrum receiver with coherent detection 116 1984
 
Ascom Zelcom AG (1)
4,984,247 Digital radio transmission system for a cellular network, using the spread spectrum method 240 1989
 
ROCKWELL INTERNATIONAL CORPORATION (1)
4,601,043 Digital communications software control system 22 1984
 
The Charles Stark Draper Laboratory, Inc. (1)
4,841,544 Digital direct sequence spread spectrum receiver 66 1987

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
INTEL CORPORATION (44)
5,497,424 Spread spectrum wireless telephone system 81 1994
6,088,590 Method and system for mobile controlled handoff and link maintenance in spread spectrum communication 32 1994
5,648,982 Spread spectrum transmitter 45 1994
5,640,674 Three-cell wireless communication system 7 1995
5,832,022 Method and apparatus for controlling the modulation index of continuous phase modulated (CPM) signals 29 1995
5,959,980 Timing adjustment control for efficient time division duplex communication 57 1995
5,689,502 Efficient frequency division duplex communication system with interleaved format and timing adjustment control 127 1995
5,832,028 Method and apparatus for coherent serial correlation of a spread spectrum signal 4 1995
5,818,820 Method and system for data link expansion or contraction using spread spectrum TDMA communication 129 1995
5,768,264 Time division multiple access base station supporting ISDN messages 10 1995
5,754,584 Non-coherent spread-spectrum continuous-phase modulation communication system 19 1995
5,754,585 Method and apparatus for serial noncoherent correlation of a spread spectrum signal 5 1995
5,692,007 Method and apparatus for differential phase encoding and decoding in spread-spectrum communication systems with continuous-phase modulation 13 1995
5,680,414 Synchronization apparatus and method for spread spectrum receiver 37 1995
5,671,219 Communication protocol for spread spectrum communication 44 1995
5,659,574 Multi-bit correlation of continuous phase modulated signals 20 1995
5,648,955 Method for power control in a TDMA spread spectrum communication system 111 1995
5,629,956 Method and apparatus for reception and noncoherent serial correlation of a continuous phase modulated signal 12 1995
5,627,856 Method and apparatus for receiving and despreading a continuous phase-modulated spread spectrum signal using self-synchronizing correlators 18 1995
5,610,940 Method and apparatus for noncoherent reception and correlation of a continous phase modulated signal 49 1995
6,041,046 Cyclic time hopping in time division multiple access communication system 26 1995
6,005,856 Communication protocol for spread spectrum wireless communication system 50 1996
6,161,013 Wireless communication system and method 72 1996
5,856,998 Method and apparatus for correlating a continuous phase modulated spread spectrum signal 8 1996
6,112,080 Wireless communication method and system 144 1996
6,094,421 Timing adjustment control for efficient time division duplex, frequency division duplex or hybrid time division duplex/frequency division duplex communication 149 1997
5,787,076 Multi-mode TDMA spread spectrum communication system 28 1997
5,742,638 Spread-spectrum data publishing system 5 1997
6,115,412 Spread spectrum wireless telephone system 6 1997
5,881,100 Method and apparatus for coherent correlation of a spread spectrum signal 13 1997
6,118,824 Spread-spectrum data publishing system 40 1998
6,983,150 Wireless cellular communication system 2 1998
6,421,368 Spread spectrum wireless communication system 1 1999
6,388,997 Timing adjustment control for efficient time division duplex communication 87 2000
6,621,852 Spread spectrum wireless communication system 1 2001
7,554,964 Wireless telephone system with diversity transmission and method 9 2002
7,463,608 Transmitting station for wireless telephone system with diversity transmission and method 9 2002
6,947,469 Method and Apparatus for wireless spread spectrum communication with preamble processing period 8 2002
7,120,187 Spread spectrum wireless communication system 0 2003
8,248,988 Locating a wireless user 1 2003
8,228,886 Code transmission over timeslots and antennas 0 2005
8,130,696 Transmitting an information signal over antennas 0 2005
8,432,867 Method and apparatus for receiving code transmissions over timeslots and antennas 0 2008
8,155,017 Method and apparatus for locating a wireless user 0 2008
 
QUALCOMM INCORPORATED (10)
5,805,648 Method and apparatus for performing search acquisition in a CDMA communication system 79 1995
5,907,813 Signal acquisition in a wireless communication system by transmitting repeated access probes from a terminal to a hub 24 1995
5,644,591 Method and apparatus for performing search acquisition in a CDMA communications system 142 1996
5,790,589 System and method for rapidly reacquiring a pilot channel 43 1996
6,101,173 Adaptive reacquisition time in a slotted paging environment 16 1998
6,363,060 Method and apparatus for fast WCDMA acquisition 100 1999
6,990,091 Method and apparatus for fast WCDMA acquisition 7 2001
7,839,960 System and method for generating signal waveforms in a CDMA cellular telephone system 1 2005
8,693,520 Channel hopping based content protection having an out-of-band communication band 0 2010
8,792,877 Range extension techniques for a wireless local area network 0 2011
 
INTELLECTUAL VENTURES HOLDING 73 LLC (7)
7,403,576 Systems and methods for receiving data in a wireless communication network 5 2004
7,406,647 Systems and methods for forward error correction in a wireless communication network 7 2004
7,391,815 Systems and methods to recover bandwidth in a communication system 4 2004
7,450,637 Ultra-wideband communication apparatus and methods 3 2004
7,483,483 Ultra-wideband communication apparatus and methods 12 2004
7,929,596 Ultra-wideband communication apparatus and methods 2 2007
8,532,586 High data rate transmitter and receiver 0 2011
 
ITT MANUFACTURING ENTERPRISES, INC. (6)
7,822,100 Phase mapping for QPSK/QBL-MSK waveform 0 2005
7,801,255 Synchronization technique for serial modulated waveforms 1 2005
7,715,505 Adaptive synchronization enhancement technique for serial modulated waveforms 0 2005
7,630,428 Fast digital carrier frequency error estimation algorithm using synchronization sequence 0 2005
7,609,755 Simplified timing correction for data despreading of serial offset quadrature pulse-shaped spread signals 1 2005
7,593,454 Enhanced QPSK or DQPSK data demodulation for direct sequence spreading (DSS) system waveforms using orthogonal or near-orthogonal spreading sequences 2 2005
 
LIFESYNC CORPORATION (6)
6,897,788 Wireless system protocol for telemetry monitoring 187 2002
6,987,965 Programmable wireless electrode system for medical monitoring 57 2002
7,933,642 Wireless ECG system 11 2003
7,272,428 Wireless electrocardiograph system and method 30 2003
7,171,166 Programmable wireless electrode system for medical monitoring 55 2005
8,255,041 Wireless ECG system 5 2011
 
AT&T WIRELESS SERVICES, INC. (5)
6,600,776 Vertical adaptive antenna array for a discrete multitone spread spectrum communications system 55 1998
7,106,781 Highly bandwidth-efficient communications 33 2001
6,782,039 Vertical adaptive antenna array for a discrete multitone spread spectrum communications system 46 2003
8,305,990 Method for frequency division duplex communications 0 2011
8,693,432 Method for frequency division duplex communications 0 2012
 
AT&T MOBILITY II LLC (4)
6,975,668 Adaptive weight update method and system for a discrete multitone spread spectrum communications system 17 2001
6,853,629 Method for frequency division duplex communications 48 2003
7,061,969 Vertical adaptive antenna array for a discrete multitone spread spectrum communication system 16 2004
7,983,217 Method for frequency division duplex communications 6 2008
 
GOOGLE INC. (4)
6,014,405 Spread spectrum multipath receiver without a tracking loop 7 1997
6,061,359 Increased-capacity, packet spread-spectrum system and method 31 1997
6,515,981 Packet-switched spread-spectrum system 6 1999
6,304,592 Coherent detection using matched filter enhanced spread spectrum demodulation 3 2000
 
XIRCOM II WIRELESS, INC. (4)
6,094,575 Communication system and method 98 1996
5,850,600 Three cell wireless communication system 2 1997
5,953,370 Apparatus for receiving and correlating a spread spectrum signal 15 1997
6,532,365 PCS pocket phone/microcell communication over-air protocol 35 2000
 
WI-LAN INC. (3)
5,745,496 Apparatus and method of establishing a downlink communication path in a wireless telecommunications system 13 1995
5,923,668 Apparatus and method of establishing a downlink communication path in a wireless telecommunications system 2 1997
6,175,560 Apparatus and method of establishing and maintaining communication paths in a wireless telecommunications system 17 1998
 
XIRCOM WIRELESS, INC. (3)
5,802,046 Efficient time division duplex communication system with interleaved format and timing adjustment control 96 1995
5,745,484 Efficient communication system using time division multiplexing and timing adjustment control 123 1995
6,366,566 Efficient communication system using time division multiplexing and timing adjustment control 17 1999
 
BODY SCIENCE LLC (2)
7,215,991 Wireless medical diagnosis and monitoring equipment 158 2003
8,771,184 Wireless medical diagnosis and monitoring equipment 0 2007
 
CLEARWIRE IP HOLDINGS LLC (2)
6,785,300 Delay compensation 6 2002
7,460,561 Delay compensation 0 2004
 
INTERDIGITAL TECHNOLOGY CORPORATION (2)
5,410,568 CDMA/TDMA spread-spectrum communications system and method 128 1993
RE35402 CDMA/TDMA spread-spectrum communications system and method 9 1994
 
XIRCOM, INC. (2)
6,229,792 Spread spectrum communication system 48 1995
6,317,452 Method and apparatus for wireless spread spectrum communication with preamble sounding gap 44 1999
 
BROADCOM CORPORATION (1)
7,924,783 Hierarchical communications system 8 2000
 
BSD Broadband, N.V. (1)
5,995,536 System for discrete data transmission with noise-like, broadband signals 17 1998
 
CINGULAR WIRELESS II, LLC (1)
7,149,238 Highly bandwidth-efficient communications 65 2006
 
Echelon Corporation (1)
5,289,498 Adaptive data recovery for spread spectrum systems 16 1992
 
GOLDEN BRIDGE TECHNOLOGY (1)
6,154,483 Coherent detection using matched filter enhanced spread spectrum demodulation 15 1997
 
INTELLECTUAL VENTURES HOLDING 73 LLC (1)
8,744,389 High data rate transmitter and receiver 0 2011
 
L-3 COMMUNICATIONS CORPORATION (1)
7,133,440 Acquisition of a synchronous CDMA TDD QPSK waveform using variable thresholds for PN and burst synchronization 4 2002
 
Life Sync Corporation (1)
7,197,357 Wireless ECG system 40 2001
 
LUCENT TECHNOLOGIES INC. (1)
6,526,029 Search scheme for receivers in mobile communication systems 12 1998
 
MOTOROLA MOBILITY LLC (1)
5,506,863 Method and apparatus for operating with a hopping control channel in a communication system 101 1993
 
OMNIPOINT TECHNOLOGIES, INC. (1)
5,757,847 Method and apparatus for decoding a phase encoded signal 13 1995
 
PULSE-LING, INC. (1)
8,045,935 High data rate transmitter and receiver 5 2005
 
ROCKWELL INTERNATIONAL CORPORATION (1)
5,335,248 Apparatus for correlating multi-frequency signals 4 1993
 
SICK STEGMANN GMBH (1)
7,984,632 Method for synchronizing the bi-directional transmission of data 0 2007
 
TELEDYNE SCIENTIFIC & IMAGING, LLC (1)
6,151,354 Multi-mode, multi-band, multi-user radio system architecture 145 1997
 
UNISYS CORPORATION (1)
5,303,260 Method and circuit for compensating for oscillator drift in a spread-spectrum communication system 9 1993
 
VIASAT, INC. (1)
5,454,009 Method and apparatus for providing energy dispersal using frequency diversity in a satellite communications system 129 1994
 
XIROM WIRELESS, INC. (1)
5,963,586 Method and apparatus for parallel noncoherent correlation of a spread spectrum signal 11 1995