Patents by Inventor Bjorn Gudmundson
Bjorn Gudmundson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 7248874Abstract: A mobile station assists the wireless network with handover from a first base station to a second base station. The mobile station receives transmissions from the first base station using a first spreading code corresponding to the first base station while receiving signals from at least one other base station. The mobile station determines the relative signal strengths of the signals received from the other base stations and reports the relative signal strengths to the first base station to support handover determinations by the wireless network.Type: GrantFiled: August 29, 2003Date of Patent: July 24, 2007Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Bengt Yngve Persson, Björn Gudmundson, Paul Wilkinson Dent
-
Patent number: 7212820Abstract: A method and system for facilitating handover in mobile radio communication systems are illustrated. The mobile unit assists in making handover decisions by monitoring the signal strength of control channels transmitted by base stations in neighboring cells. During the handover, the mobile station can receive the same information from and/or transmit the same information to a plurality of base stations to provide diversity combination and improve transmission quality.Type: GrantFiled: February 2, 1995Date of Patent: May 1, 2007Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Bengt Yngve Persson, Björn Gudmundson, Paul Wilkinson Dent
-
Publication number: 20040038682Abstract: A mobile station assists the wireless network with handover from a first base station to a second base station. The mobile station receives transmissions from the first base station using a first spreading code corresponding to the first base station while receiving signals from at least one other base station. The mobile station determines the relative signal strengths of the signals received from the other base stations and reports the relative signal strengths to the first base station to support handover determinations by the wireless network.Type: ApplicationFiled: August 29, 2003Publication date: February 26, 2004Inventors: Bengt Yngve Persson, Bjorn Gudmundson, Paul Wilkinson Dent
-
Publication number: 20030013447Abstract: A method and system for facilitating handover in mobile radio communication systems are disclosed. The mobile unit assists in making handover decisions by monitoring the signal strength of control channels transmitted by base stations in neighboring cells. During the handover, the mobile station can receive the same information from and/or transmit the same information to a plurality of base stations to provide diversity combination and improve transmission quality.Type: ApplicationFiled: February 2, 1995Publication date: January 16, 2003Inventors: BENGT Y. PERSSON, BJORN GUDMUNDSON, PAUL W. DENT
-
Patent number: 6167039Abstract: Mobile stations using antenna diversity are described. Techniques for combining CDMA signals received over plural antennas at a mobile unit are provided which suppress interference from undesired base stations.Type: GrantFiled: December 17, 1997Date of Patent: December 26, 2000Assignee: Telefonaktiebolget LM EricssonInventors: Jonas Karlsson, Bjorn Gudmundson, Ulf Forssen, Sara Mazur
-
Patent number: 5727032Abstract: In a digital signal transmission system, a receiver receives a signal, wherein the signal bandwidth of the system exceeds the system symbol rate. A correlation and sampling circuit receives a baseband signal, samples the signal eight times per symbol time, correlates, generates a channel estimate and down-samples the sampled signal to form an observed signal. This signal is filtered in a prefilter, whose output is sampled at symbol rate and the obtained signal is delivered to a channel equalizer which performs a viterbi algorithm with non-quadratic metric calculation and generates estimated symbols. A channel estimation filter receives a symbol sequence which contains alternate zero-value symbols and the estimated symbols and generates an estimated signal. An error signal is generated and used to adapt the channel estimate and also to generate weight factors. The coefficients of the prefilter are generated as a function of the channel estimate and the weight factors.Type: GrantFiled: October 6, 1995Date of Patent: March 10, 1998Assignee: Telefonaktiebolaget LM EricssonInventors: Karim Jamal, Bjorn Gudmundson, Gustav Brismark
-
Patent number: 5615409Abstract: A method and apparatus for transmitting and receiving signals in a base station with an antenna array in a cellular communication system. The available communication channels are divided into a plurality of classes. The base station transmits signals to the mobile station in a first class of channels in a wide antenna lobe. The position of a mobile station can then be determined from signals received at the base station from the mobile station. After the position of the mobile station has been determined, the base station can transmit signals to and receive signals from the mobile station in a second class channel with a narrow antenna lobe.Type: GrantFiled: September 25, 1995Date of Patent: March 25, 1997Assignee: Telefonaktiebolaget LM EricssonInventors: Ulf Forssen, Bjorn Gudmundson
-
Patent number: 5566209Abstract: A transceiver for improving the spectral efficiency and the capacity of cellular communication systems is disclosed. The transceiver uses an antenna array for communicating in a cellular communication system with a plurality of mobile stations. In addition, the transceiver contains a spatial filter connected to an antenna array wherein the spatial filter has as many outputs as there are array elements and as many inputs as there are spatial channels. A splitter then splits data to be transmitted to each mobile station into a number of parallel data streams, the number of parallel data streams corresponds with the number of spatial channels in the system, wherein the data streams, are delayed based upon uplink measurements. Finally, power allocators are provided for allocating transmission power to each possible channel based upon long-term SNR measurements on the uplink.Type: GrantFiled: February 10, 1994Date of Patent: October 15, 1996Assignee: Telefonaktiebolaget LM EricssonInventors: Ulf Forssen, Bjorn Gudmundson
-
Patent number: 5537434Abstract: A communication system having a frequency hopping scheme which provides an improved initial synchronization in mobile stations of control channels. Special synchronization bursts are inserted into the hop sequence of the control channels which, when decoded, give the mobile station the hop sequence to follow for the control channel.Type: GrantFiled: October 25, 1993Date of Patent: July 16, 1996Assignee: Telefonaktiebolaget LM EricssonInventors: Bengt Persson, Bjorn Gudmundson, Hakan Eriksson, Alex K. Raith
-
Patent number: 5533067Abstract: In a digital signal transmission system, a receiver receives a signal, wherein the signal bandwidth of the system exceeds the system symbol rate. A correlation and sampling circuit receives a baseband signal, samples the signal eight times per symbol time, correlates, generates a channel estimate and down-samples the sampled signal to form an observed signal. This signal is filtered in a prefilter, whose output is sampled at symbol rate and the obtained signal is delivered to a channel equalizer which performs a viterbi algorithm with non-quadratic metric calculation and generates estimated symbols. A channel estimation filter receives a symbol sequence which contains alternate zero-value symbols and the estimated symbols and generates an estimated signal. An error signal is generated and used to adapt the channel estimate and also to generate weight factors. The coefficients of the prefilter are generated as a function of the channel estimate and the weight factors.Type: GrantFiled: June 23, 1994Date of Patent: July 2, 1996Assignee: Telefonaktiebolaget LM EricssonInventors: Karim Jamal, Bjorn Gudmundson, Gustav Brismark
-
Patent number: 5341397Abstract: A Code Division Multiple Access (CDMA) communication system which allocates different sets of frequencies to cells with different transmission power levels. Based upon the transmission power levels of a base station for each cell, each base station is assigned to one of at least two groups of base stations. Each group of base stations is assigned a set of frequencies for traffic communication. The set of frequencies assigned to one group of base stations does not overlap with the set of frequencies assigned to a different group of base stations.Type: GrantFiled: December 8, 1993Date of Patent: August 23, 1994Assignee: Telefonaktiebolaget L M EricssonInventor: Bjorn Gudmundson
-
Patent number: 5295153Abstract: A Code Division Multiple Access (CDMA) communication system which allocates different sets of frequencies to cells with different transmission power levels. Based upon the transmission power levels of a base station for each cell, each base station is assigned to one of at least two groups of base stations. Each group of base stations is assigned a set of frequencies for traffic communication. The set of frequencies assigned to one group of base stations does not overlap with the set of frequencies assigned to a different group of base stations.Type: GrantFiled: April 13, 1992Date of Patent: March 15, 1994Assignee: Telefonaktiebolaget L M EricssonInventor: Bjorn Gudmundson
-
Patent number: 5295152Abstract: A method and system for increasing the capacity of radiotelephone communication systems by eliminating interference to communication traffic caused by random access bursts from unconnected mobile station are disclosed. Access slots are provided in CDMA signals by interrupting other communication traffic of mobile stations using the same frequency at periodic intervals. This allows mobile access bursts to be received at a base station without interfering with other traffic.Type: GrantFiled: April 10, 1992Date of Patent: March 15, 1994Assignee: Telefonaktiebolaget L M EricssonInventors: Bjorn Gudmundson, Bengt Persson