公开(公告)号：EP0767976B1

公开(公告)日：2002-08-28

申请号：EP95926635.4

申请日：1995-06-16

申请人： INTERDIGITAL TECHNOLOGY CORPORATION

发明人： SCHILLING, Donald, L.

IPC分类号： H01Q3/26 ,  H04B15/00 ,  H04K1/00 ,  H04K1/10 ,  H04L27/30 ,  H04B7/08

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

摘要： 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.

公开(公告)号：EP0746932B1

公开(公告)日：2002-08-28

申请号：EP94902319.6

申请日：1993-11-23

申请人： STANFORD TELECOMMUNICATIONS, INC

发明人： BUSTAMANTE, Herman ,  NATALI, Franci ,  MAGILL, David, Thomas

IPC分类号： H04L27/30

CPC分类号： H04J13/0022 ,  H04B7/216 ,  H04B7/2628 ,  H04W84/14

公开(公告)号：EP1212856A1

公开(公告)日：2002-06-12

申请号：EP00920023.9

申请日：2000-04-01

申请人： Custom One Design, Inc.

发明人： NUYTKENS, Peter, R. ,  MITWALLI, Ahmed

IPC分类号： H04B15/00 ,  H04K1/00 ,  H04L27/30

CPC分类号： H04H20/31 ,  H04B1/707 ,  H04B2201/70715 ,  H04N7/08

摘要： Systems and methods for the communication and recovery of supplementary data encoded in the primary information transmitted from a source to a receiver for both audio and television transmissions. The method includes modulating a carrier signal with the supplementary data using a spread spectrum approach and demodulating the carrier signal to recover the embedded supplementary data.

公开(公告)号：EP0536334B1

公开(公告)日：2002-05-22

申请号：EP91915727.1

申请日：1991-06-21

申请人： QUALCOMM, INC.

发明人： GILHOUSEN, Klein, S. ,  JACOBS, Irwin, M. ,  PADOVANI, Roberto ,  WEAVER, Lindsay, A., Jr. ,  WHEATLEY, Charles, E., III ,  VITERBI, Andrew, J.

IPC分类号： H04L27/30 ,  H04B7/26 ,  H04J13/00 ,  H04L5/02 ,  H04L5/12 ,  H04L23/02

CPC分类号： H04L1/0002 ,  H04B1/3888 ,  H04B1/707 ,  H04B1/70757 ,  H04B1/709 ,  H04B1/7115 ,  H04B7/2618 ,  H04B7/2628 ,  H04B7/2637 ,  H04B2201/70701 ,  H04B2201/70703 ,  H04J13/0022 ,  H04J13/0048 ,  H04J13/10 ,  H04J13/107 ,  H04J13/18 ,  H04L1/0006 ,  H04L1/0046 ,  H04L1/0065 ,  H04L1/0068 ,  H04L1/0071 ,  H04L1/06 ,  H04L1/08 ,  H04L5/02 ,  H04L5/12 ,  H04L23/02 ,  H04W52/26 ,  Y02D50/10

摘要： 1. A modulation system for use in spread spectrum communications, comprising: means for generating a first orthogonal sequence signal corresponding to a selected one of a plurality of orthogonal binary sequences; means for generating a pseudo-noise (PN) signal corresponding to a predetermined PN binary sequence; means for combining said first orthogonal sequence signal and said PN signal and for providing a resultant first modulation signal. 2. The system of 1 further comprising additional means for combining said first modulation signal with an input information signal and for providing a resultant spread spectrum information signal. 3. The system of 1 wherein said plurality of orthogonal binary sequences are Walsh sequences. 4. The system of 1 wherein said PN sequence is an augmented length maximal linear sequence PN code.

公开(公告)号：EP1180290A1

公开(公告)日：2002-02-20

申请号：EP00919115.6

申请日：2000-04-18

申请人： D.S.P.C. Technologies LTD.

发明人： SMOLYAR, Lev ,  YELLIN, Daniel ,  RAINISH, Doron

IPC分类号： H04L27/30 ,  H04L1/02 ,  H04L7/00 ,  H04B7/216

CPC分类号： H04B1/7117 ,  H04B1/7085 ,  H04B2201/70709

摘要： In a receiver having at least two fingers, the fingers tracking at least one path of a multipath channel, a method includes the steps of forming a finger block of at leat two of the two fingers and jointly tracking the fingers of said finger block. The step of jointly tracking includes the steps of generating direction metrics (12) of each of a set of possible directions of joint movement (16) of the fingers of the finger block, selecting one of the direction metrics (12) according to a predetermined criterion, and moving the fingers of the finger block in the directions indicated by the selected direction metric.

公开(公告)号：EP0874495A3

公开(公告)日：2001-08-16

申请号：EP98440074.7

申请日：1998-04-14

申请人： ALCATEL

发明人： Böhm, Manfred, Dr.

IPC分类号： H04L5/06 ,  H04L27/30 ,  H04L27/10

CPC分类号： H04L5/06

摘要： Digitale Signale werden üblicherweise z.B. im Einträgerverfahren oder im Mehrträgerverfahren übertragen. Bei beiden Verfahren wird eine Trägerfrequenz je Übertragungskanal bzw. je Teilkanal vorgegebener Bandbreite verwendet. Erfindungsgemäß werden zur Erhöhung der Übertragungkapazität eines Kanals mindestens zwei Trägerfrequenzen ( f1, f2, f3 ) verwendet. Der Frequenzabstand zweier Trägerfrequenzen ist dabei z.B. um den Faktor 500 geringer als der Absolutwert einer Trägerfrequenz ( f1, f2, f3 ). Die durch die Überlagerung ( ADD ) mehrerer Trägerfrequenzen ( f1, f2, f3 ) in einem Kanal entstehende Schwebungsfrequenz ist vernachlässigbar, insbesondere dann, wenn die ausgesendeten Trägerfrequenzen (f1, f2, f3 ) untereinander einen phasengleichen Schwingungsbeginn ausweisen. Durch die Überlagerung ( ADD ) mehrerer Trägerfrequenzen (f1, f2, f3) können für unterschiedliche Bitströme ( DATA1, DATA2, DATA3 ) gleiche resultierende Trägerfrequenzen entstehen. Als Unterscheidungsmerkmal kann beispielsweise eine unterschiedliche Amplitude, eine unterschiedliche Winkeleinstellung oder die Zuordnung zu zusätzlichen Trägerfrequenzen verwendet werden.

公开(公告)号：EP1121068A1

公开(公告)日：2001-08-08

申请号：EP99969009.2

申请日：1999-09-10

申请人： MOTOROLA, INC.

发明人： WANG, Michael, Mao ,  BROWN, Tyler

IPC分类号： A61F2/06 ,  H04L27/30

CPC分类号： H04B1/7115 ,  H04B1/7117

摘要： A base station receiver assembly (400) for performing a signal search, which operates in a coherent code division multiple access (CDMA) wireless communication system conveying a mobile communication signal is disclosed. The assembly (400) includes a multipath signal searcher (200), a receiver (300), and an energy adjustment generator (490). The energy adjustment generator operates to combine an energy metric (241) from the multipath signal searcher (200) with a symbol match count (447) to yield a signal (448) for weighting inputs to a finger manager (260). The symbol match count (447) is based on a count, resulting from a comparison of a number of times an output from the multipath signal searcher (200) matched an output from the receiver (300). The symbol match count (447) is representative of a likelihood that a time offset selected by the finger manager (260) corresponds to a time offset of the mobile communication signal (107).

公开(公告)号：EP1092294A1

公开(公告)日：2001-04-18

申请号：EP99917565.6

申请日：1999-04-16

申请人： MOTOROLA, INC.

发明人： LOVE, Robert, T. ,  ASHLEY, James, P. ,  PROCTOR, Lee ,  BAROT, Anil ,  COHEN, Arnie

IPC分类号： H04J3/16 ,  H04J3/22 ,  H04B7/216 ,  H04B15/00 ,  H04K1/00 ,  H04L27/30

CPC分类号： H04L1/0021 ,  H04L1/0009 ,  H04L1/0025 ,  H04W52/30

摘要： Forward link communication capacity of a communication system, which is providing from a base station to a number of mobile stations a number of forward communication links (123) corresponding to the plurality of mobile stations, is controlled by receiving gain setting (102) associated with at least one of the forward communication links, comparing the gain setting with a gain threshold (123), and adjusting a first encoding rate of at least one of the forward communication links to a second encoding rate based on the comparing. A gain offset (310) attunes the gain threshold (123) to update the gain threshold (123) according to a latest condition of the communication system. The gain offset (310) further is used to determine blocking of an incoming call to the communication system.

公开(公告)号：EP0795986A3

公开(公告)日：2000-11-22

申请号：EP97301456.6

申请日：1997-03-04

申请人： LUCENT TECHNOLOGIES INC.

发明人： Chesir, Aaron Michael ,  May, Carl Jerome

IPC分类号： H04L27/30 ,  H03H21/00

CPC分类号： H04L27/30

摘要： An adaptive Infinite Impulse Response (IIR) filter is provided that can adaptively detect the presence of one or more tones in its input stream. The tones to be detected may be of arbitrary frequency, subject only to a limitation that such tones fall within a frequency band consistent with accepted sampling principles ( e.g. , a maximum frequency of interest no greater than one-half the sampling frequency -- Nyquist sampling criteria). An IIR filter developed according to the method of the invention will adaptively locate the frequencies of tones to be detected, thereby allowing for frequency drift from nominal expected frequency values with no loss in accuracy. Such a filter will also process the input signal sample-by-sample, thereby avoiding the blocking problem of FFT-based filter approaches. With the filter of the invention, an application can identify the frequencies, associated power levels, SNR and duration of the tones. Thus, such an application can use a simple user specified library of tone parameters to decide if tones of interest are present in the input stream.

公开(公告)号：EP1036453A1

公开(公告)日：2000-09-20

申请号：EP98962856.5

申请日：1998-11-30

申请人： STANFORD TELECOMMUNICATIONS, INC

发明人： MACKENTHUN, Ken

IPC分类号： H04L27/30 ,  H03M7/00 ,  G06F11/00

CPC分类号： H04L1/0071 ,  H03M13/235 ,  H03M13/27 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/4161 ,  H03M13/4169 ,  H04L1/0054

摘要： A solution to the problem of frequency offset in a digital communication system. On the transmitter side, interleaving (108) is applied to a stream (102) of symbols to which an error correcting code (104) has been applied. The interleaving (108) is such that symbols of the stream (102) are divided into two groups, e.g., alternating symbols are assigned to different groups. The result of interleaving is a burst where symbols of a first one of the group are transmitted in ascending order and symbols of a second group are transmitted in descending order. In one embodiment, the second group comes first in the burst, then one or more synchronization symbols followed by the first group.