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公开(公告)号：EP1685739B1
公开(公告)日：2019-06-19
申请号：EP04810621.5
申请日：2004-11-10
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公开(公告)号：EP1576733A1
公开(公告)日：2005-09-21
申请号：EP03783405.8
申请日：2003-11-12
IPC分类号： H03M13/00
CPC分类号： H04L1/0057 , H03M13/11 , H03M13/6393
摘要： Method and apparatus for generating codewords with variable length and redundancy from a single Low-Density Parity-Check (LDPC) code with variable length input words. A mother code for encoding data words is generated based on a parity-check matrix, wherein the mother code is adjusted to reflect the size of the data word to be encoded. A generator matrix applies the mother code to data words to produce codewords for transmission. In one embodiment, a reduction criteria is determined and the size of the generator matrix reduced in response. The corresponding parity-check matrix is applied at the receiver for decoding the received codeword.
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公开(公告)号：EP1488512B1
公开(公告)日：2008-07-02
申请号：EP03721474.9
申请日：2003-03-26
CPC分类号： H03G3/3036 , H03G3/3068
摘要： Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.
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公开(公告)号：EP1597879A1
公开(公告)日：2005-11-23
申请号：EP04712335.1
申请日：2004-02-18
IPC分类号： H04L12/56
CPC分类号： H04L12/5602 , H04L63/162
摘要： Method and apparatus for variable length Physical Layer (PL) packet generation. Multiple Security Layer (SL) packets may be multiplexed into a single PL packet to increase efficiency, wherein the SL packets may have variable lengths. In one embodiment, different format SL packets for different users are combined into capsules that form the PL packet. Shorter packets are for users in poor channel conditions or requiring smaller amounts of data due to the applications and the accompanying Quality of Service (QoS) requirements. In one embodiment, a modified Preamble structure provides for Unicast or multi-user packets. Alternate embodiment provides modified Rate Sets, a mechanism for identifying ACK from a single-user packet or a multiplexed packet (delayed ACK). ON/OFF keying for ACK channel v/s bi-polar keying used in IS-856, and/or multi-valued interpretation of DRC.
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公开(公告)号：EP1342335A2
公开(公告)日：2003-09-10
申请号：EP01990097.6
申请日：2001-12-13
IPC分类号： H04L1/24
CPC分类号： H04B17/309 , H04B1/707
摘要： A method and an apparatus for waveform quality measurement are disclosed. An actual signal, representing a waveform channelized both in time and in code is generated by, e.g., an exemplary HDR communication system. Test equipment generates an ideal waveform corresponding to the actual waveform. The test equipment then generates an estimate of offsets between parameters of the actual waveform and the ideal waveform, and the offsets are used to compensate the actual waveform. The test equipment then evaluates various waveform quality measurements utilizing the compensated actual waveform quality measurements as well as conceptual and practical examples of processing of the actual waveform and the corresponding ideal waveform by the test equipment are disclosed. The disclosed method and apparatus may be extended to any waveform channelized both in time and in code regardless of the equipment that generated the waveform.
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公开(公告)号：EP1260029A2
公开(公告)日：2002-11-27
申请号：EP00941402.0
申请日：2000-06-13
IPC分类号： H04B1/707
CPC分类号： H04B1/7115 , H04B1/712 , H04B7/0854
摘要： An optimum combiner that reduces the amount of interference imposed upon a first base station (102) by transmissions of other base stations within the same communication system. Two antennas (112, 114) are used to receive transmissions within a receiving station (110). A rake receiver is coupled to each antenna (112, 114). By optimally combining the signals that are received by each independent finger of the rake receiver, interference that is correlated between a finger associated with the first antenna (112) and a finger associated with the second antenna (114) can be minimized with respect to the desired signal. Optimum combining requires determination of optimum combining coefficients. A max-ratio combining algorithm may be substituted for the optimal combining algorithm depending upon interference characteristics.
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7.发明授权METHOD AND APPARATUS FOR ESTIMATING POWER REQUIRED FOR TRANSMISSION OF DATA AT A RATE IN A COMMUNICATION SYSTEM 有权方法和装置用于估算数据传输所需的服务与的速率的通信系统
公开(公告)号：EP1481495B1
公开(公告)日：2008-04-23
申请号：EP03744228.2
申请日：2003-03-04
CPC分类号： H04W52/26 , H04L1/0002 , H04L1/0021 , H04W52/223 , H04W52/24 , H04W52/265 , H04W52/267 , H04W52/34 , H04W52/367
摘要： Methods and apparatus for estimating maximum rate of data and for estimating a transmission power required for transmission of a data with a rate of data in a communication system are disclosed. A terminal determines a quality metric of a communication link, over which data are to be transmitted, and modifies the determined quality metric by a quality metric margin. The terminal then estimates the maximum rate of data in accordance with the modified quality metric. Alternatively, the terminal then estimates transmission power required for transmission of a data with a rate of data in accordance with the rate of data and the modified quality metric. The quality metric margin may be pre-determined or dynamically adjusted. The terminal dynamically adjusts the quality metric margin in accordance with a result of comparison of a transmit power corresponding to the estimated maximum rate of data with an actual transmit power used to transmit the data.
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公开(公告)号：EP1685739A1
公开(公告)日：2006-08-02
申请号：EP04810621.5
申请日：2004-11-10
CPC分类号： H04W28/18 , H04W52/06 , H04W52/12 , H04W52/146 , H04W52/16 , H04W74/002 , H04W88/06
摘要： A communication system includes a plurality of access terminals, and an access network. The access network schedules a transmission of data in a time interval from one of the access terminals. The access network selects a multiple access transmission mode from a plurality of multiple access transmission modes, and broadcasts the selected multiple access transmission mode to the access terminals. The selected mode may include a mode in which data is code-division-multiplexed during the time interval, and modes in which data is code-division-multiplexed during a first portion of the time interval, and data is either time-division-multiplexed or orthogonal-frequency-division-multiplexed during a second portion of the time interval.
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公开(公告)号：EP1488512A1
公开(公告)日：2004-12-22
申请号：EP03721474.9
申请日：2003-03-26
CPC分类号： H03G3/3036 , H03G3/3068
摘要： Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.
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10.发明公开METHOD AND APPARATUS FOR ESTIMATING POWER REQUIRED FOR TRANSMISSION OF DATA AT A RATE IN A COMMUNICATION SYSTEM 有权方法和装置用于估算数据传输所需的服务与的速率的通信系统
公开(公告)号：EP1481495A1
公开(公告)日：2004-12-01
申请号：EP03744228.2
申请日：2003-03-04
CPC分类号： H04W52/26 , H04L1/0002 , H04L1/0021 , H04W52/223 , H04W52/24 , H04W52/265 , H04W52/267 , H04W52/34 , H04W52/367
摘要： Methods and apparatus for estimating maximum rate of data and for estimating a transmission power required for transmission of a data with a rate of data in a communication system are disclosed. A terminal determines a quality metric of a communication link, over which data are to be transmitted, and modifies the determined quality metric by a quality metric margin. The terminal then estimates the maximum rate of data in accordance with the modified quality metric. Alternatively, the terminal then estimates transmission power required for transmission of a data with a rate of data in accordance with the rate of data and the modified quality metric. The quality metric margin may be pre-determined or dynamically adjusted. The terminal dynamically adjusts the quality metric margin in accordance with a result of comparison of a transmit power corresponding to the estimated maximum rate of data with an actual transmit power used to transmit the data.
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