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    SPREAD SPECTRUM INTERFERENCE ELIMINATION SYSTEM AND METHOD
    2.
    发明专利
    SPREAD SPECTRUM INTERFERENCE ELIMINATION SYSTEM AND METHOD 失效

    公开(公告)号：JP2001053721A

    公开(公告)日：2001-02-23

    申请号：JP2000188314

    申请日：2000-06-22

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L ,  KOWALSKI JOHN ,  MOSHAVI SHIMON

    IPC: H04B1/10 ,  H04B1/12 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7107 ,  H04B7/216 ,  H04L7/00 ,  H04J13/04

    Abstract: PROBLEM TO BE SOLVED: To reduce noise due to an interference signal in a direct sequence spread spectrum code division multiple access(CDMA) receiver. SOLUTION: In an interference eliminating device, the spread spectrum CDMA signal is inversely spread into plural inverse spread signals by using plural chip code signals from chip code signal generators 52, 62, 72 by correlation devices 54, 64, 74. A spread processing is performed for the plural inverse spread signals by using synchronous output of the plural chip code signal from delaying devices 53, 63, 73 by plural spread spectrum processing circuits 55, 65, 75. Each of N-1 pieces of the inverse spread signals to which the spread processing is performed is subtracted from the spread spectrum CDMA signals to recover a code channel using the i-th chip code signal and the subtracted signal is generated by this subtraction by a subtracting circuit 150. The subtracted signal is inversely spread by a channel correlation device 146.

    PHASED ARRAY SPREAD SPECTRUM SYSTEM AND METHOD
    3.
    发明公开
    PHASED ARRAY SPREAD SPECTRUM SYSTEM AND METHOD 无效
    扩频系统和方法的相控阵。

    公开(公告)号：EP0767976A4

    公开(公告)日：2000-05-17

    申请号：EP95926635

    申请日：1995-06-16

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: H01Q3/38 ,  G01S3/42 ,  H01Q3/22 ,  H01Q3/26 ,  H04B1/10 ,  H04B1/26 ,  H04B1/69 ,  H04B1/707 ,  H04B7/08 ,  H04B15/00 ,  H04L1/06 ,  H04K1/00 ,  H04K1/10 ,  H04L27/30

    CPC classification number: H04B7/0894 ,  G01S3/42 ,  H01Q3/22 ,  H01Q3/26 ,  H01Q3/2605 ,  H01Q3/2682 ,  H04B1/1081 ,  H04B1/69 ,  H04B1/707 ,  H04B7/084 ,  H04L1/06

    Abstract: A phased array spread-spectrum system maximizes signal strength of a spread-spectrum signal with multipath. RF/IF section (21) receives a plurality of spread-spectrum signals. RF/IF section (22) receives a plurality of phased versions of the plurality of spread-spectrum signals. Digital delay devices (27, 28) delay the received spread-spectrum signals with respect to their phased versions by a plurality of delays. Summers (29, 30) combine the delayed spread-spectrum signals and their phased versions as a plurality of combined signals. Despreader (31) despreads the combined signals as a plurality of despread signals. Magnitude device (32) generates a plurality of magnitude values from the despread signals. Shift register (33) stores a plurality of previous-magnitude values and present-magnitude values previously and presently generated by the magnitude device (32). Comparator (34) compares the previous-magnitude values to the present-magnitude values and outputs a plurality of comparison signals. Digital delay devices (27, 28), responsive to the comparison signals, lengthen or shorten the plurality of delays.

    SPREAD-SPECTRUM CHANGEABLE BASE STATION
    4.
    发明公开
    SPREAD-SPECTRUM CHANGEABLE BASE STATION 失效
    可交换基站蔓延

    公开(公告)号：EP0767993A4

    公开(公告)日：2000-03-01

    申请号：EP95925568

    申请日：1995-06-16

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: H04B1/707 ,  H04B1/7093 ,  H04B7/216 ,  H04B7/26 ,  H04M3/56 ,  H04W88/08 ,  H04L12/18

    CPC classification number: H04W88/06 ,  H04B1/707 ,  H04B1/7093 ,  H04M3/56 ,  H04M2207/18 ,  H04W72/005 ,  H04W84/20 ,  H04W88/08

    Abstract: A conference calling spread-spectrum communications system and method using a plurality of spread-spectrum units, any one of which may serve as the base station and where the base station may be changed upon demand. Each spread-sprectrum unit includes a base subunit (11-21), a remote subunit (40), and a command subunit (41-44). An operator may initiate from the command subunit (41-44), a command signal to activate the base subunit (11-21). Accordingly, upon initiating the command signal, the command signal is broadcast to the plurality of spread-spectrum units. At the respective remote subunit (40), in each of the spread-spectrum units, the command signal is received, and in response to receiving the command signal, the remote subunit (40) is activated.

    SPREAD SPECTRUM INTERFERENCE CANCELER SYSTEM AND METHOD
    5.
    发明公开
    SPREAD SPECTRUM INTERFERENCE CANCELER SYSTEM AND METHOD 失效
    方法和系统干扰抑制扩频

    公开(公告)号：EP0772928A4

    公开(公告)日：1999-10-13

    申请号：EP95927544

    申请日：1995-07-05

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L ,  KOWALSKI JOHN ,  MOSHAVI SHIMON

    IPC: H04B1/10 ,  H04B1/12 ,  H04B1/707 ,  H04B1/709 ,  H04B1/7093 ,  H04B1/7107 ,  H04B7/216 ,  H04L7/00 ,  H04J13/02

    CPC classification number: H04B1/71075 ,  H04B1/709 ,  H04B1/7093

    Abstract: A spread-spectrum CDMA interference canceler for reducing interference in a DS/CDMA receiver having N chip-code channels. The interference canceler includes a plurality of correlators (54, 64, 74), a plurality of spread-spectrum-processing circuits (55, 65, 75), subtracting circuits (150), and channel correlators (146). Using a plurality of chip-code signals generated from chip codeword signal generators (52, 62, 72), the correlators (54, 64, 74) despreads the spread-spectrum CDMA signal as a plurality of despread signals. The plurality of spread-spectrum-processing circuits (55, 65, 75) uses a timed version of the plurality of chip-code signals generated from the delay devices (53, 63, 73), for spread-spectrum processing the plurality of despread signals. For recovering a code channel using an ith chip-code-signal, the subtracting circuits (150) subtracts from the spread-spectrum CDMA signal, each of the N-1 spread-spectrum-processed-despread signals thereby generating a subtracted signal. The channel-correlator (146) despreads the subtracted signal.

    6.
    发明专利
    未知

    公开(公告)号：FI121207B

    公开(公告)日：2010-08-13

    申请号：FI20040598

    申请日：2004-04-28

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: H04M3/56 ,  H04B1/707 ,  H04B1/7093 ,  H04B7/216 ,  H04B7/26 ,  H04W88/08

    Abstract: A communication unit for use in a spread-spectrum communication system having a plurality of the units which allow for simultaneous communication among of a plurality of active units, each communication unit comprising a command signal generator for generating a command signal; a transmitter for transmitting communication signals at one of two frequencies and for transmitting said command signal; and a receiver for receiving communication signals at one of said two frequencies and for receiving said command signal, whereby upon initiation of said command signal, said command signal is transmitted for receipt by all active units in the system and the unit transmitting said command signal receives communication signals at a selected frequency of said two frequencies and transmits communication signals at another frequency, and whereby upon reception of said command signal from another unit in the system, the unit receiving said command signal transmits a communication signal at said selected frequency of said two frequencies and receives communication signals at said another frequency.

    ADAPTIVE POWER CONTROL FOR A SPREAD SPECTRUM COMMUNICATIONS SYSTEM AND METHOD
    9.
    发明专利
    ADAPTIVE POWER CONTROL FOR A SPREAD SPECTRUM COMMUNICATIONS SYSTEM AND METHOD 未知

    公开(公告)号：CA2616764C

    公开(公告)日：2009-02-10

    申请号：CA2616764

    申请日：1992-11-18

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: H04W52/24 ,  H04B1/707 ,  H04B7/005 ,  H04W52/14 ,  H04W52/22 ,  H04W52/52

    Abstract: A code division multiple access (CDMA) mobile station, the mobile station comprising circuitry configured to determine a power level of a received first CDMA channel; circuitry configured to determine a value indicating an interfering power level; circuitry configured to demodulate a reference value from a received second CDMA channel; and circuitry configured to determine a transmission power level of the mobile station based on the determined power level, interfering power level value and the reference value. A method for use by a code division multiple access (CDMA) mobile station; the method comprising determining a power level of a received first CDMA channel; determining a value indicating an interfering power level; demodulating a reference value from a received second CDMA channel; and determining a transmission power level of the mobile station based on the determined power level, interfering power level value and the reference value.

    TRANSMISOR CDMA DE AMPLIO ESPECTRO.
    10.
    发明专利
    TRANSMISOR CDMA DE AMPLIO ESPECTRO. 未知

    公开(公告)号：ES2281159T3

    公开(公告)日：2007-09-16

    申请号：ES99123930

    申请日：1991-12-03

    Applicant: INTERDIGITAL TECH CORP

    Inventor： SCHILLING DONALD L

    IPC: G01S5/00 ,  G01S5/14 ,  G01S13/82 ,  G01S19/16 ,  G01S19/48 ,  H04B1/707 ,  H04B1/71 ,  H04B7/005 ,  H04B7/185 ,  H04B7/216 ,  H04B7/26 ,  H04J13/00 ,  H04W16/02 ,  H04W52/34

    Abstract: Un transmisor (CDMA) de acceso múltiple de división por códigos de espectro extendido para comunicar datos a un receptor CDMA de espectro extendido en una misma región geográfica cubierta por un sistema celular. La invención se refiere al sistema celular que comunica utilizando una pluralidad de anchos de banda de frecuencia predeterminada. El transmisor CDMA se caracteriza por medios (151, 153, 253, 257, 171, 173, 273) para generar una difusión de señal de datos CDMA de espectro extendido con una secuencia de código de chip pseudoaleatoria, teniendo los datos de CDMA una gran ancho de banda que se superpone a dich pluralidad de anchos de banda de frecuencia predeterminada medios (155, 157, 159, 255, 175, 179) para transmitir dicha señal de datos de difusión a dicho receptor CDMA. La invención se refiere también a un procedimiento para transmitir datos entre un transmisor CDMA y un receptor con un ancho de banda que se superpone a anchos de banda de frecuencia de un sistema celular.

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