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公开(公告)号：DE69836097D1
公开(公告)日：2006-11-16
申请号：DE69836097
申请日：1998-11-30
Applicant: QUALCOMM INC
Inventor： ODENWALDER P , LUNDBY A , WHEATLEY E , TIEDEMANN G
Abstract: A method and apparatus for providing diversity transmissions to a mobile unit from a transmitting station having at least first and second antennas by repeatedly switching between the two antennas during the transmission of information to the receiving unit. Message information is transmitted from the first antenna in the transmitting station to the receiving unit. After the start of the transmission of the message information from the first antenna, transmission of the message information from the first antenna to the receiving unit terminates and transmission of the message information from the second antenna in the transmitting station to the receiving unit is initiated. Some time after transmission of the message information from second antenna is initiated, the transmission of the message information from the second antenna to the receiving unit terminates and transmission of the message information from the first antenna in the transmitting station to the receiving unit is initiated. Repeated switching between the first and second antennas is achieved by repeating the process. The switching results in diversity transmissions that improve the ability of a receiving unit to receive the coded and interleaved transmitted message information from the transmitting station. The interleaver disperses the encoded symbols in each antenna dwell period such that the decoder decisions are based on a mix of symbols form each antenna. Therefore the decoder decisions are unreliable only when the mix of symbols from the different antennas, with different fading characteristics, are unreliable over the span of symbols the decoder uses in its decision process.
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公开(公告)号：DE60123272D1
公开(公告)日：2006-11-02
申请号：DE60123272
申请日：2001-11-29
Applicant: QUALCOMM INC
Inventor： RAZOUMOV LEONID , LUNDBY A , HOLTZMAN M , TIEDEMANN G , ODENWALDER P
IPC: H04L1/00 , H04B1/7103 , H04B7/005 , H04L1/20 , H04W52/36
Abstract: A method for coherent estimation of the traffic-to-pilot energy ratio is presented. A received preamble is decoded (20), and then re-encoded (22). The received preamble is then multiplied by the re-encoded preamble (23). The results are summmed (24), squared (26), and then divided by a pilot energy value (28). In another method, a message (41) carrying energy information can be inserted between a subpacket preamble (40) and a subpacket (42).
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公开(公告)号：DE60123272T2
公开(公告)日：2007-04-05
申请号：DE60123272
申请日：2001-11-29
Applicant: QUALCOMM INC
Inventor： RAZOUMOV LEONID , LUNDBY A , HOLTZMAN M , TIEDEMANN G , ODENWALDER P
IPC: H04L1/00 , H04B1/7103 , H04B7/005 , H04L1/20 , H04W52/36
Abstract: A method for coherent estimation of the traffic-to-pilot energy ratio is presented. A received preamble is decoded (20), and then re-encoded (22). The received preamble is then multiplied by the re-encoded preamble (23). The results are summmed (24), squared (26), and then divided by a pilot energy value (28). In another method, a message (41) carrying energy information can be inserted between a subpacket preamble (40) and a subpacket (42).
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公开(公告)号：DE60027708D1
公开(公告)日：2006-06-08
申请号：DE60027708
申请日：2000-03-06
Applicant: QUALCOMM INC
Inventor： TIEDEMANN G , LUNDBY A
Abstract: A method and apparatus for maximizing the use of available capacity in a communication system having a base station and a plurality of mobile stations. The forward link includes a plurality of traffic streams sent on at least one channel from the base station to the mobile stations. The forward link is subject to a maximum power ceiling. A first output power level associated with simultaneously transmitting a first set of one or more traffic streams on the forward link is initially determined. Next, the first output power level is compared to the maximum power ceiling; and at least one time frame in the forward link having available capacity for transmitting a portion of at least one further traffic stream is identified. The first set of traffic streams and the portion of the at least one further traffic stream are then transmitted simultaneously during the at least one frame on the forward link.
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公开(公告)号：DE69837044T2
公开(公告)日：2007-11-22
申请号：DE69837044
申请日：1998-09-08
Applicant: QUALCOMM INC
Inventor： LUNDBY A , ODENWALDER P , TIEDEMANN G
IPC: H04J11/00 , H04B1/707 , H04B7/26 , H04J13/00 , H04J13/10 , H04W16/00 , H04W16/24 , H04W16/32 , H04W48/08 , H04W48/16
Abstract: A method and apparatus for providing orthogonal spot beams (14a, 14b), sectors (16a, 16b), and picocells (18). The transmissions can be made orthogonal by using orthogonal auxiliary pilots and different Walsh traffic channels in adjacent areas. In accordance with the IS-95 standard, the pilot signal is covered with the 64-chip Walsh sequence zero. The 64-chip all zeros Walsh sequence can be designated as P and the 64-chip all one sequence can be designated as M. In the present invention, additional pilot signals can be provided by concatenating 64-chip all zeros P and all ones M sequences. Thus, for two pilot signals, pilot Walsh sequences of PP and PM can be used. For four pilot signals, pilot Walsh sequences of PPPP, PMPM, PPMM, and PMMP can be used. The present invention can be extended such that any required number of pilot Walsh sequences can be generated by substituting each bit in an K-bit Walsh sequence with the 64-chip all zeros P or all ones M sequence depending on the value of that bit.
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Patent Agency Ranking
公开(公告)号：DE60214834T2
公开(公告)日：2007-06-14
申请号：DE60214834
申请日：2002-03-29
Applicant: QUALCOMM INC
Inventor： LUNDBY A
Abstract: In a communication system, a method and an accompanying apparatus provide for efficient modulation and demodulation processes. In a transmitter (100), a ratio of power level of a communication channel over power level of a pilot channel is determined to produce a power level ratio. The power level ratio is quantized within a finite digital word. A quantized quadrature amplitude modulation distance, in a quadrature amplitude modulation constellation, is determined based on the quantized power level ratio. A signal, in accordance with a quadrature amplitude modulation technique, is modulated using the quantized distance, and transmitted to a receiver (160).
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公开(公告)号：DE69836097T2
公开(公告)日：2007-05-16
申请号：DE69836097
申请日：1998-11-30
Applicant: QUALCOMM INC
Inventor： ODENWALDER P , LUNDBY A , WHEATLEY E , TIEDEMANN G
Abstract: A method and apparatus for providing diversity transmissions to a mobile unit from a transmitting station having at least first and second antennas by repeatedly switching between the two antennas during the transmission of information to the receiving unit. Message information is transmitted from the first antenna in the transmitting station to the receiving unit. After the start of the transmission of the message information from the first antenna, transmission of the message information from the first antenna to the receiving unit terminates and transmission of the message information from the second antenna in the transmitting station to the receiving unit is initiated. Some time after transmission of the message information from second antenna is initiated, the transmission of the message information from the second antenna to the receiving unit terminates and transmission of the message information from the first antenna in the transmitting station to the receiving unit is initiated. Repeated switching between the first and second antennas is achieved by repeating the process. The switching results in diversity transmissions that improve the ability of a receiving unit to receive the coded and interleaved transmitted message information from the transmitting station. The interleaver disperses the encoded symbols in each antenna dwell period such that the decoder decisions are based on a mix of symbols form each antenna. Therefore the decoder decisions are unreliable only when the mix of symbols from the different antennas, with different fading characteristics, are unreliable over the span of symbols the decoder uses in its decision process.
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公开(公告)号：DE60217910T2
公开(公告)日：2007-10-25
申请号：DE60217910
申请日：2002-12-17
Applicant: QUALCOMM INC
Inventor： LUNDBY A
IPC: H04L12/18 , H04L1/00 , H04L1/16 , H04L12/56 , H04W4/06 , H04W4/08 , H04W8/26 , H04W12/00 , H04W28/04 , H04W72/08
Abstract: Methods and apparatus are presented for efficient broadcasting in wireless packet data systems. A single MAC_ID is used for broadcasting to a group of subscribers. By using the channel quality information of the group of subscribers, a base station determines the identity of the subscriber with the worst channel conditions. The timing and the transmission format of the multi-cast are then tailored so that the subscriber with the worst channel conditions is capable of recovering the transmission. If the timing and the transmission format is chosen in relation to subscriber with the worst channel conditions, it is probable that other subscribers will be able to recover the transmission as well. Hence, only a single MAC_ID need to be used to make a single broadcast, rather than sending multiple transmissions to multiple subscribers.
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公开(公告)号：DE60027708T2
公开(公告)日：2007-04-05
申请号：DE60027708
申请日：2000-03-06
Applicant: QUALCOMM INC
Inventor： TIEDEMANN G , LUNDBY A
Abstract: A method and apparatus for maximizing the use of available capacity in a communication system having a base station and a plurality of mobile stations. The forward link includes a plurality of traffic streams sent on at least one channel from the base station to the mobile stations. The forward link is subject to a maximum power ceiling. A first output power level associated with simultaneously transmitting a first set of one or more traffic streams on the forward link is initially determined. Next, the first output power level is compared to the maximum power ceiling; and at least one time frame in the forward link having available capacity for transmitting a portion of at least one further traffic stream is identified. The first set of traffic streams and the portion of the at least one further traffic stream are then transmitted simultaneously during the at least one frame on the forward link.
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公开(公告)号：DE69837044D1
公开(公告)日：2007-03-22
申请号：DE69837044
申请日：1998-09-08
Applicant: QUALCOMM INC
Inventor： LUNDBY A , ODENWALDER P , TIEDEMANN G
IPC: H04J11/00 , H04B1/707 , H04B7/26 , H04J13/00 , H04J13/10 , H04W16/00 , H04W16/24 , H04W16/32 , H04W48/08 , H04W48/16
Abstract: A method and apparatus for providing orthogonal spot beams (14a, 14b), sectors (16a, 16b), and picocells (18). The transmissions can be made orthogonal by using orthogonal auxiliary pilots and different Walsh traffic channels in adjacent areas. In accordance with the IS-95 standard, the pilot signal is covered with the 64-chip Walsh sequence zero. The 64-chip all zeros Walsh sequence can be designated as P and the 64-chip all one sequence can be designated as M. In the present invention, additional pilot signals can be provided by concatenating 64-chip all zeros P and all ones M sequences. Thus, for two pilot signals, pilot Walsh sequences of PP and PM can be used. For four pilot signals, pilot Walsh sequences of PPPP, PMPM, PPMM, and PMMP can be used. The present invention can be extended such that any required number of pilot Walsh sequences can be generated by substituting each bit in an K-bit Walsh sequence with the 64-chip all zeros P or all ones M sequence depending on the value of that bit.
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