Source: http://www.google.com/patents/US8111645?dq=7751826
Timestamp: 2015-01-30 12:52:41
Document Index: 9145323

Matched Legal Cases: ['Application No. 60', 'art 15', 'art 15', 'art 16', 'art 16', 'art 16', 'art 16', 'application No. 200380101286', 'application No. 2003239577', 'art 16', 'art 11', 'art 11', 'art 11', 'art 16', 'application No. 200380105267', 'Application No. 03814391', 'Application No. 2004', 'application No. 03734136', 'application No. 03759271', 'application No. 03759271', 'application No. 200380101286', 'Application No. 200380101286', 'application No. 03814391']

Patent US8111645 - Wireless local area network repeater with detection - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA frequency translating repeater (200) for use in a time division duplex radio protocol communications system includes an automatic gain control feature. Detection is performed by comparators (401, 411) ADCs (402, 412); DACs (404, 414) and a processor (315). Detection can be overridden by processor (315)...http://www.google.com/patents/US8111645?utm_source=gb-gplus-sharePatent US8111645 - Wireless local area network repeater with detectionAdvanced Patent SearchPublication numberUS8111645 B2Publication typeGrantApplication numberUS 10/533,589PCT numberPCT/US2003/035050Publication dateFeb 7, 2012Filing dateNov 17, 2003Priority dateNov 15, 2002Also published asCA2504347A1, CN1711711A, CN100588133C, EP1568167A2, EP1568167A4, US20060056352, WO2004047308A2, WO2004047308A3Publication number10533589, 533589, PCT/2003/35050, PCT/US/2003/035050, PCT/US/2003/35050, PCT/US/3/035050, PCT/US/3/35050, PCT/US2003/035050, PCT/US2003/35050, PCT/US2003035050, PCT/US200335050, PCT/US3/035050, PCT/US3/35050, PCT/US3035050, PCT/US335050, US 8111645 B2, US 8111645B2, US-B2-8111645, US8111645 B2, US8111645B2InventorsJames A. Proctor, Jr., Kenneth M. GalneyOriginal AssigneeQualcomm IncorporatedExport CitationBiBTeX, EndNote, RefManPatent Citations (108), Non-Patent Citations (47), Referenced by (5), Classifications (13), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetWireless local area network repeater with detectionUS 8111645 B2Abstract A frequency translating repeater (200) for use in a time division duplex radio protocol communications system includes an automatic gain control feature. Detection is performed by comparators (401, 411) ADCs (402, 412); DACs (404, 414) and a processor (315). Detection can be overridden by processor (315) using logic elements (406, 416, 407, and 417) to control the generation of a Channel A/Channel B signal and a PA_ON signal for controlling a power amplifier associated with the transmitter.
CROSS REFERENCE TO RELATED APPLICATIONS This application is related to and claims priority from pending U.S. Provisional Application No. 60/426,541 filed Nov. 15, 2002, and is further related to PCT Application PCT/US03/16208 entitled WIRELESS LOCAL AREA NETWORK REPEATER, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION The present invention relates generally to wireless local area networks (WLANs) and, particularly, the present invention relates to dynamic frequency detection in a frequency translating repeater.
SUMMARY OF THE INVENTION Accordingly, in various exemplary and alternative exemplary embodiments, the present invention extends the coverage area in a wireless environment such as a WLAN environment, and, broadly speaking, in any time division duplex system including IEEE 802.16, IEEE 802.20 and TDS-CDMA, with a dynamic frequency detection method. An exemplary WLAN frequency translating repeater allows two WLAN nodes or units to communicate by translating packets from a first frequency channel used by one device to a second frequency channel used by a second device. The direction of the conversion from channel 1 to channel 2, versus from channel 2 to channel 1, is dependent upon real time configuration. The repeater may preferably monitor both channels for transmissions, and when a transmission on a channel is detected, the repeater is configured to translate the received signal to the other channel, where it is transmitted.
RF delays are preferably implemented using Surface Acoustic Wave (SAW) filters. SAW filters provide the capability to enable analog signal storage, to provide channel selection, to provide jammer suppression, to provide a �feed-forward� variable gain control path, and the like. An exemplary detection process in accordance with various exemplary embodiments may be performed in an analog only configuration using a threshold comparator. It will be appreciated that such an analog only mode would not make use of an ADC directly. An exemplary processor may play a role in the detection process to, for example, actively control the analog reference voltage associated with detection comparators used to make the detection decisions. Alternatively, the output of the log amps may be digitized and the detection decision may be made in an all digital fashion. As noted above, a draw back of an all-digital architecture is that high speed ADCs and a high performance processor are required leading to relatively high expenses. An additional problem associated with the use of an all digital path and a processor is the significant delay associated with digital sampling and decision making.
To enhance the coverage and/or communication data rate to the client unit 105, wireless repeater 200 receives packets transmitted on a first frequency channel 201 from the wireless gateway 100. The wireless repeater 200, which may be housed in an enclosure typically having dimensions of, for example, 2.5″�3.5″�5″, and which preferably is capable of being plugged into a standard electrical outlet and operating on 110 V AC power, detects the presence of a packet on the first frequency channel 201, receives the packet and re-transmits the packet with more power on a second frequency channel 202. Unlike conventional WLAN operating protocols, the client unit 105 operates on the second frequency channel, even though the wireless gateway 100 operates on the first frequency channel. To perform the return packet operation, the wireless repeater 200 detects the presence of a transmitted packet on the second frequency channel 202 from the client unit 105, receives the packet on the second frequency channel 202, and re-transmits the packet on the first frequency channel 201. The wireless gateway 100 then receives the packet on the first frequency channel 201. In this way, the wireless repeater 200 is capable of simultaneously receiving and transmitting signals as well as extending the coverage and performance of the wireless gateway 100 to the client unit 105.
It will be appreciated that detection algorithms may be based on a statistical analysis of samples of a received signal at ADCs 402 and 412 and can include level crossing rates, average multipliers, and the like. Alternatively a SAW tooth control algorithm may be used to observe the �qualified� false detection rate, for example, on comparator 401 and 411. The SAW tooth control algorithm works by determining when a false detection has occurred and further qualifying the false detection using known parameters of the relevant packet protocol, such as packet duration and the like. If a threshold is crossed for only short periods of time, shorter than the packet duration, a false detection is most probable. It should be noted that valid ranges for packet durations are defined in accordance with protocol standards and specifications, such as 802.11 and the like. If a detection interval is too short, the detection cannot be associated with a valid 802.11 packet. If a detection interval is too long, the detection cannot be associated with a valid 802.11 packet either.
Accordingly, it would be likely that in such situations, the detection threshold is set too low, interference may be present, the repeater could be oscillating, or the like. A SAW tooth control algorithm adds an increment to the threshold for the comparator every time a false detection occurs, then subtracts a small amount from the threshold every time there is no detection. It will be appreciated that the relative increments and decrements of the detection threshold level will determine the false alarm rate, and the time constant of the resulting control loop. While SAW tooth control schemes have been effectively used in reverse link �outer loop power control� in, for example, IS-95 CDMA base stations, the application of a SAW tooth control loop to detection in accordance with various exemplary embodiments, provides advantages not previously appreciated.
Once reliable detection thresholds are set, two control lines may be output in connection with the �fast detect� analog circuitry. Channel A/Channel B line is preferably output from OR element 407 for controlling switches in FIG. 3 which determine which IF channel is up-converted and transmitted. The other control line PA_ON is preferably output from AND element 417, and may be used to enable, disable, or otherwise control the output of the transmitter by enabling or disabling the power amplifier. It should be noted that OR element 407 and AND element 417 are provided to allow processor 315 a final degree of control over the respective outputs through override signals. Actual generation of logic levels associated with detection is preferably performed by AND element 406 and OR element 416. For PA control, outputs of comparators 401 and 411 are input to OR function 416.
For Channel A and Channel B detection, output signal 415 from comparator 411 is coupled to into an inverting input of AND element 406 resulting in an input which is �active low� and will produce a logic 0 on the output of AND element 406 when a signal is present on channel B. When a signal is present on channel A, output signal 405 from comparator 401 will be active and preferably a logic 1 or high level, producing a logic 1 or high level on the output of AND 406 provided that input �Override 1� is present. Override 1 signal preferably allows the processor to directly control the A/B line despite the presence or absence of signals. For example, if Override 1 is set low, the output will be forced to a low output indicative of channel B detection. If Override 1 is set high, AND element 406 will operate normally. To force the selection of Channel A, processor 315 preferably activates Override 2 which is input to OR element 407 forcing the output high indicative of channel A detection.
If detection is valid and not determined to be a false alarm, a packet timer may be started and a digital override of the transmitter performed at 507 to �lock� it on, providing a reduction of sensitivity to noise in a low signal strength environment. The packet timer will be useful to determine if the duration of the received transmission is within reasonable and valid time limits within the scope of various standards, like 802.11, wherein packets have a specified minimum and a maximum duration in time. It will be appreciated that packet duration time limits may be used to qualify a received transmission to determine if a packet duration is valid or invalid. If the packet duration as determined by the packet timer is too short, the detected signal was either a random false detection caused by noise or the like, RADAR, or other interference as will be appreciated by those of ordinary skill. If the packet duration as determined by the packet timer is too long, the detected signal may be associated with interference such as would be caused by a cordless phone, microwave, or the like, or may be caused by an oscillation condition due, for example, to self-oscillation within the same repeater, or may be associated with a system oscillation as would result from two repeaters operating within range of each other. Thus, the timer is tested at 508 to determine if the minimum packet duration has elapsed. If not, and the signal continues to be present, false alarm criteria may be refined at 509 and the condition re-tested at 511, whereupon the timer may continue to be monitored at 508, criteria refined at 509, and false alarm condition re-tested at 511. If a false alarm due to early termination is detected, for example based on the signal no longer being present, as false alarm is logged and transmitter disabled at 506. If the minimum packet duration as measured by the timer has been exceeded in accordance with, for example, 802.11 or appropriate protocol at 508, new criteria for determining the occurrence of a valid end of packet may be refined at 510. If the timer indicates that the duration of signal detection has not exceeded the maximum possible packet duration at 512, end of packet criteria at 510 are used at 514 to determine if the packet has terminated. If not, criteria are further refined at 510 and timer re-tested at 512. If the end of packed it detected at 514, the transmitter is turned off and the signal detection process is started again at 502. If the timer exceeds the maximum packet duration, and signal continues to be present, the transmitter is turned off at 513.
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No. 11/339,838, now U.S. Patent No. 7,230,935.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8196199 *Oct 19, 2005Jun 5, 2012Airdefense, Inc.Personal wireless monitoring agentUS8649418Feb 8, 2013Feb 11, 2014CBF Networks, Inc.Enhancement of the channel propagation matrix order and rank for a wireless channelUS8693945Dec 4, 2012Apr 8, 2014Andrew LlcSystem and method for detecting and measuring uplink traffic in signal repeating systemsUS20060063484 *Oct 24, 2003Mar 23, 2006Proctor James A JrWireless local area network repeater with in-band control channelUS20060085543 *Oct 19, 2005Apr 20, 2006Airdefense, Inc.Personal wireless monitoring agent* Cited by examinerClassifications U.S. Classification370/315, 455/9International ClassificationH04W16/26, H04B7/00, H04B1/60, H04B7/14, H04B7/204, H04B7/15Cooperative ClassificationH04B7/15564, H04B7/15542, H04W16/26, H04W84/12European ClassificationH04B7/155F2Legal EventsDateCodeEventDescriptionJan 2, 2008ASAssignmentOwner name: QUALCOMM INCORPORATED, CALIFORNIAFree format text: NUNC PRO TUNC ASSIGNMENT EFFECTIVE AS OF OCTOBER 26, 2007;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:020317/0300Effective date: 20071220Owner name: QUALCOMM INCORPORATED,CALIFORNIAFree format text: NUNC PRO TUNC ASSIGNMENT EFFECTIVE AS OF OCTOBER 26, 2007;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:20317/300Nov 29, 2007ASAssignmentOwner name: QUALCOMM INCORPORATED, CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:020177/0065Effective date: 20071026Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:20177/65Owner name: QUALCOMM INCORPORATED,CALIFORNIAOct 26, 2007ASAssignmentOwner name: SQUARE 1 BANK, NORTH CAROLINAFree format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:020064/0042Effective date: 20071026May 29, 2007ASAssignmentOwner name: SQUARE 1 BANK, NORTH CAROLINAFree format text: SECURITY AGREEMENT;ASSIGNOR:WIDEFI, INC.;REEL/FRAME:019448/0201Effective date: 20060919May 3, 2005ASAssignmentOwner name: WIDEFI, INC., FLORIDAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PROCTOR, JAMES A., JR.;GAINEY, KENNETH M.;REEL/FRAME:017465/0738Effective date: 20050429RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services