公开(公告)号：AT450991T

公开(公告)日：2009-12-15

申请号：AT03751685

申请日：2003-10-07

Applicant: ERICSSON TELEFON AB L M

Inventor： OESTMAN THOMAS ,  PETTERSSON JAN

IPC: H04W52/54 ,  H04B7/005

Abstract: The present invention relates to cellular mobile radio systems, and more especially it relates to Code Division Multiple Access, CDMA, cellular mobile radio systems, particularly to transmission power control in such systems. A method and apparatus for transmission of compensated TPC commands when a substantial loop delay is experienced for one or more user equipment entities is disclosed.

公开(公告)号：GB2374216B

公开(公告)日：2004-04-14

申请号：GB0204011

申请日：2000-09-05

Applicant: ERICSSON TELEFON AB L M

Inventor： HE NING ,  KLANG GOERAN ,  RIPSTRAND TORBJOERN ,  OESTMAN THOMAS

IPC: H04B1/707 ,  H03G3/30 ,  H04B1/28 ,  H04B7/005 ,  H04B7/26

公开(公告)号：GB2374216A

公开(公告)日：2002-10-09

申请号：GB0204011

申请日：2000-09-05

Applicant: ERICSSON TELEFON AB L M

Inventor： HE NING ,  KLANG GOERAN ,  RIPSTRAND TORBJOERN ,  OESTMAN THOMAS

IPC: H04B1/707 ,  H03G3/30 ,  H04B1/28 ,  H04B7/005 ,  H04B7/26

Abstract: The present invention relates to a code division multiple access (CDMA) communication system, more particularly to an arrangement and a method in a receiver (10) to simplify and improve signal processing in the demodulator (11) of the receiver (10) by means of reducing the long term dynamic range of received signals and, thus, reducing the number of bits needed for coding of said signals. This is accomplished by a signal processing means (16) in the signal input paths in front of the demodulator (11), said means (16) including at least an improved digital AGC-unit (161), which scales incoming signal samples to a common and constant power level, and including a subsequent quantizer unit (162), which transforms the scaled signal samples to samples using a reduced number of bits. Due to this, the transmission bandwidth in the receiver unit is reduced and the signal processing in the demodulator is less complex.

公开(公告)号：SE9903235L

公开(公告)日：2001-03-11

申请号：SE9903235

申请日：1999-09-10

Applicant: ERICSSON TELEFON AB L M

Inventor： HE NING ,  KLANG GOERAN ,  RIPSTRAND TORBJOERN ,  OESTMAN THOMAS

IPC: H04B1/707 ,  H03G3/30 ,  H04B1/28 ,  H04B7/005 ,  H04B7/26

公开(公告)号：CA2294767A1

公开(公告)日：1999-01-14

申请号：CA2294767

申请日：1998-06-24

Applicant: ERICSSON TELEFON AB L M

Inventor： EKLUND MICHAEL ,  OESTMAN THOMAS

IPC: H01Q3/26 ,  H04B7/08

Abstract: A method and system for rejecting interfering signals in a wireless communication system employing antenna diversity. According to the method, the angle between an interfering signal and a desired carrier signal is determined and used to estimate an offset angle. The offset angle is incrementally adjusted such that, when added to the received signal, the carrier-to-interference (C/I) ratio of the received signal is substantially maximized.

公开(公告)号：AU4681196A

公开(公告)日：1996-08-21

申请号：AU4681196

申请日：1996-01-30

Applicant: ERICSSON TELEFON AB L M

Inventor： OESTMAN THOMAS ,  GUSTAFSSON MAGNUS ,  JAERLEHOLM ANDERS

IPC: H03G3/20 ,  H03G7/00

Abstract: A device and method are provided for fully realizing the precision gained internally from a conventional digital signal processor by generating a feed forward automatic gain control (AGC) signal. The feed forward AGC bit is indicative of the output of the digital signal processor being multiplied by a gain factor when the output from the digital filter included in the digital signal processor is below a threshold value. When the feed forward AGC signal is received by an inphase and quadrature (I/Q)-to-(logR/ phi ) converter connected to the digital signal processor, a corresponding value is subtracted from the radius component of the signal calculated by the (I/Q)-to-(logR/ phi ) converter. Because conventional digital signal processors have 16 IO bits, the feed forward AGC signal allows an input signal with a dynamic range and precision exceeding 16 bits to be transferred from the digital signal processor without loosing performance. As a result, a digital signal processor with a fewer number of IO bits than is nominally required for the precision and dynamic range of the output signal is implemented.

公开(公告)号：AT444601T

公开(公告)日：2009-10-15

申请号：AT01934731

申请日：2001-05-11

Applicant: ERICSSON TELEFON AB L M

Inventor： OESTMAN THOMAS ,  FARONIUS CAROLA

IPC: H04B1/707

Abstract: The present invention is related to a Rake receiver (R 1 ) for receiving a radio signal and to a searcher (S 8 a, S 8 b) for estimating the delay profile of one or more radio links. The searcher includes means for estimating delay profiles in separate windows. The searcher is arranged for being switched into a single window mode or alternatively into a multiple window mode. In single window mode the delay profiles of separate radio links are estimated in the windows, while in multiple window mode two or more windows are allocated adjacent in time for estimating the delay profile of the same radio link. Thereby, the use of the resources of the searcher can be adapted to the radio environments in which the searcher will be used. The Rake receiver comprises fingers that are grouped into two sets. Within a set of fingers the propagation paths are time aligned. The output from the two set of fingers are time aligned and then combined.

公开(公告)号：DE69836623T2

公开(公告)日：2007-10-11

申请号：DE69836623

申请日：1998-01-09

Applicant: ERICSSON TELEFON AB L M

Inventor： HAGERMAN BO ,  FORSSEN ULF ,  OESTMAN THOMAS ,  MAHLER HANS

IPC: H01Q3/26 ,  H01Q25/00 ,  H04B7/26 ,  H04W16/28

Abstract: Directional beam generative apparatus, and an associated method, for a radio communication station forms directional antenna beam patterns for the communication of communication signals with remote communication stations operable in a TDMA communication system. Channels are allocated for effectuation of communications between the radio communication station and the remote stations responsive to indications of locations at which the remote communication stations are indicated to be positioned. Remote communication stations indicated to be positioned within a selected area are allocated to channels formed upon a single carrier.

公开(公告)号：MY118073A

公开(公告)日：2004-08-30

申请号：MYPI9702001

申请日：1997-05-07

Applicant: ERICSSON TELEFON AB L M

Inventor： ULF FORSSEN ,  OESTMAN THOMAS ,  BOTTOMLEY GREGORY E

IPC: H04B7/02 ,  H04L25/08 ,  H01Q3/26 ,  H03M13/23 ,  H04B7/08 ,  H04B7/10 ,  H04B7/26 ,  H04L1/02 ,  H04L1/06 ,  H04L25/03 ,  H04W16/28

Abstract: RECENTLY, INTERFERENCE REJECTION COMBINING TECHNIQUES HAVE BEEN PROPOSED WHICH CAN INCREASE SIGNIFICANTLY THE PERFORMANCE OF THE UPLINK IN C/I LIMITED ENVIRONMENTS. ANOTHER INTERESTING PROPERTY OF THE IRC TECHNIQUES IS THAT THEIR C/I PERFORMANCE DOES NOT DEGRADE AS THE CORRELATION BETWEEN THE RECEIVED SIGNALS INCREASES. THIS FEATURE OF IRC TECHNIQUES IS EXPLOITED IN THE PRESENT INVENTION TO ALLOW FOR A REDUCED SPACING BETWEEN THE ANTENNAS (270A, 2708; 270A'', 2708''). ACCORDING TO ANOTHER ASPECT OF THE PRESENT INVENTION, THE PERFORMANCE OF THE DOWNLINK IS IMPROVED USING BEAMFORMING TECHNIQUES TO "STEER" BASE STATION TRANSMISSIONS TOWARD A DESIRED MOBILE STATION (120). IN THIS WAY, THE PERFORMANCE OF THE DOWNLINK IS IMPROVED USING BEAMFORMING TECHNIQUES TO A DEGREE SIMILAR TO THAT AT WHICH THE UPLINK HAS BEEN IMPROVED USING IRC TECHNIQUES. THIS ALLOWS THE SYSTEM DESIGNER TO MORE FULLY EXPLOIT THE VARIATIONS IN SYSTEM DESIGN ASSOCIATED WITH IMPROVING THE UPLINK PERFORMANCE. (FIGURE 8)

公开(公告)号：DE69620744T2

公开(公告)日：2002-11-21

申请号：DE69620744

申请日：1996-01-30

Applicant: ERICSSON TELEFON AB L M

Inventor： OESTMAN THOMAS ,  GUSTAFSSON MAGNUS ,  JAERLEHOLM ANDERS

IPC: H03G3/20 ,  H03G7/00

Abstract: A device and method are provided for fully realizing the precision gained internally from a conventional digital signal processor by generating a feed forward automatic gain control (AGC) signal. The feed forward AGC bit is indicative of the output of the digital signal processor being multiplied by a gain factor when the output from the digital filter included in the digital signal processor is below a threshold value. When the feed forward AGC signal is received by an inphase and quadrature (I/Q)-to-(logR/ phi ) converter connected to the digital signal processor, a corresponding value is subtracted from the radius component of the signal calculated by the (I/Q)-to-(logR/ phi ) converter. Because conventional digital signal processors have 16 IO bits, the feed forward AGC signal allows an input signal with a dynamic range and precision exceeding 16 bits to be transferred from the digital signal processor without loosing performance. As a result, a digital signal processor with a fewer number of IO bits than is nominally required for the precision and dynamic range of the output signal is implemented.