公开(公告)号：GB2335807A

公开(公告)日：1999-09-29

申请号：GB9806203

申请日：1998-03-24

Applicant: ERICSSON TELEFON AB L M

Inventor： MATTISSON SVEN ERIK ,  HAARTSEN JACOBUS

IPC: H03C3/06 ,  H03D3/00 ,  H04B1/26 ,  H04L27/16

Abstract: A circuit for demodulating a frequency modulated input signal comprises filter means (12), and detector means (16) for producing a demodulated output signal therefrom, tuning means (18, 20) which are operable to introduce a test signal into the demodulator circuit in the absence of an incoming input signal, and to vary the frequency response characteristics of at least one of the filter means and detector means in response to the test signal. The circuit may be part of an analog or digital radio receiver. The received signal may be TDMA. The filter 12 may be tuned by maximising its output by an associated loop including a regulator (fig. 3 not shown).

公开(公告)号：BR9709296A

公开(公告)日：1999-08-10

申请号：BR9709296

申请日：1997-05-16

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H04B7/26

Abstract: The present invention relates to a method and arrangement in an ad-hoc network for synchronizing a multiple of radio transceiver arrangements with different characteristics that make use of a common air interface. Each transceiver arrangement comprises at least two transceivers which mutually communicate via a radio transmission link. All transceivers synchronize to a common synchronization signal comprising two staggered beacon pulse series signals (TX1, TX2) which have the same repetition rate. The transceivers synchronize their internal timers which control the signal transmission from the transceivers, to the strongest one of the two beacon pulse series signals (TX1, TX2) by listening during one of the corresponding sets of time windows (RX1, RX2). Between the reception of two beacon pulses, each transceiver transmits beacon pulses itself, thus contributing to the generation of the other beacon pulse series signal, on which other transceivers can lock.

公开(公告)号：CO4810278A1

公开(公告)日：1999-06-30

申请号：CO98052998

申请日：1998-09-15

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H04B1/7143 ,  H04B7/24 ,  H04B7/26 ,  H04L12/00 ,  H04L12/28 ,  H04L12/56 ,  H04W8/24 ,  H04W8/26 ,  H04W40/04 ,  H04W40/30 ,  H04W84/20

Abstract: Una red inalámbrica que se compone de:- Una unidad maestra compuesta porun mecanismo para enviar una dirección maestra a la unidad esclavaun mecanismo para enviar un reloj maestro a la unidad esclava, y un mecanismo para comunicarse con la unidad esclava por medio de un canal virtual de salto de frecuencia;- Una unidad esclava compuesta porUn mecanismo para recibir la dirección maestra de la unidad maestra;un mecanismo para recibir el reloj maestro de la unidad maestra; yun mecanismo para comunicarse con la unidad maestra por medio del canal virtual de la salto de frecuencia,y en donde:una secuencia de salto del canal virtual de salto de frecuencia es una función de la dirección maestra; yuna fase de la secuencia de salto es una función del reloj maestro.Una unidad inalámbrica para usarla en una red inalámbrica que tiene una topología dispersa. Dicha unidad inalámbrica se compone de:Un mecanismo para recibir la dirección y la información de topología de otras unidades inalámbricas; yUn mecanismo para generar un árbol de configuración a partir de la dirección y la información de topología...

公开(公告)号：AU706321B2

公开(公告)日：1999-06-17

申请号：AU5410796

申请日：1996-03-26

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H03B5/12

Abstract: An apparatus and method are provided for increasing the Q-value of an oscillator so that a net gain in the stability of the oscillators is obtained. In the apparatus and method, a plurality of units, which each include a passive frequency-selective circuit and an active amplifier, are cascaded and the required isolation between the passive frequency-selective circuits is maintained by the active amplifier acting as a buffer. As a result, interaction and loading is prevented between the passive frequency-selective circuits so that the net gain in the stability of the oscillator is achieved because the Q-value of the oscillator is increased.

公开(公告)号：BR9608249A

公开(公告)日：1999-05-11

申请号：BR9608249

申请日：1996-03-26

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H03B5/12

Abstract: An apparatus and method are provided for increasing the Q-value of an oscillator so that a net gain in the stability of the oscillators is obtained. In the apparatus and method, a plurality of units, which each include a passive frequency-selective circuit and an active amplifier, are cascaded and the required isolation between the passive frequency-selective circuits is maintained by the active amplifier acting as a buffer. As a result, interaction and loading is prevented between the passive frequency-selective circuits so that the net gain in the stability of the oscillator is achieved because the Q-value of the oscillator is increased.

公开(公告)号：SE9900589L

公开(公告)日：1999-05-07

申请号：SE9900589

申请日：1999-02-19

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H04W12/03 ,  H04W84/16 ,  H04W88/04 ,  H04Q7/26 ,  H04Q7/38

Abstract: The private radio network has base stations and mobile units in a cellular arrangement and using GSM style protocols. All of the base stations in the private network are roughly synchronised up to the multiple frame level. They transmit their beacons during the ideal frames of a connection. The mobile units measure the quality of these signals and pass this data to their base station. The base station uses the data to decide on handover timing. The base stations are linked, and the current base station advises the new base station of the frame number being used by the mobile. The new station may return a new frame number that is passed to the mobile. The transfer occurs in a single multiple frame.

公开(公告)号：CA2285544A1

公开(公告)日：1998-10-15

申请号：CA2285544

申请日：1998-04-03

Applicant: ERICSSON TELEFON AB L M

Inventor： DENT PAUL ,  HAARTSEN JACOBUS

IPC: H04M15/16 ,  H04B7/005 ,  H04B7/26 ,  H04M15/00 ,  H04M15/12 ,  H04W4/24 ,  H04W8/18 ,  H04W8/22 ,  H04W16/12 ,  H04W28/18 ,  H04W52/28 ,  H04W72/08 ,  H04Q7/38

Abstract: In a multi-reuse level cellular communications system, a channel is assigned for use by a mobile unit by first determining whether the mobile unit is a non-enhanced mobile unit or an enhanced mobile unit. Then a determination is made as to the type of communication service being requested. A minimum link quality required by the mobile unit can then be established based on factors that include the mobile unit type and the type of communication service being requested. A base station that has the necessary receiver detection capabilities and transceiver processing capabilities is then selected, and a channel, corresponding to a highest reuse plan, available to the base station is assigned to the call.

公开(公告)号：AU2313097A

公开(公告)日：1997-10-17

申请号：AU2313097

申请日：1997-03-13

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H04B1/7075 ,  H04L7/00 ,  H04L7/04 ,  H04J3/06 ,  H04J13/00

公开(公告)号：SE9601152L

公开(公告)日：1997-09-27

申请号：SE9601152

申请日：1996-03-26

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H04B1/7075 ,  H04L7/00 ,  H04L7/04 ,  H04J3/06 ,  H04J13/00

公开(公告)号：AU1323697A

公开(公告)日：1997-07-28

申请号：AU1323697

申请日：1996-12-19

Applicant: ERICSSON TELEFON AB L M

Inventor： HAARTSEN JACOBUS

IPC: H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04L29/06 ,  H04L29/08 ,  H04Q7/32 ,  H04Q7/22 ,  H04L12/28

Abstract: A retransmission method is disclosed wherein retransmissions over the sensitive link of the connection only involves packets that were actually disturbed in the sensitive link. At the same time, required storage capacity in the relay stations connecting the sensitive link to the nonsensitive link is reduced. Errors occurring in the sensitive part of the connection will cause retransmission over nonsensitive links of the connection as well, but this is considered to be of less importance since the nonsensitive links have a high throughput and/or low costs.