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1.发明授权Method and an arrangement of estimating transmitted symbols at a receiver in digital signal transmission 失效在数字信号传输中在接收机处估计传输符号的方法和装置
公开(公告)号：US5596607A
公开(公告)日：1997-01-21
申请号：US079886
申请日：1993-06-23
CPC分类号： H04L25/03178 , H04B7/005 , H04L25/025 , H04L25/03292 , H04L25/03324
摘要： In a digital time-shared transmission system, a receiver receives a signal whose symbol rate is lower than the channel bandwidth of the system. A correlating and sampling circuit receives a baseband signal, samples the signal a number of times with each symbol time, performs channel correlation, generates a channel estimate and samples down the once sampled signal to an observed signal with two values for each symbol time. A channel equalizer executes a fractional viterbi algorithm which utilizes two delta-metric values for each state transition and generates estimated symbols. A channel estimating filter receives a symbol sequence of alternating zero-value symbols and the estimated symbols and generates an estimated signal. The channel estimating filter is adapted with the aid of an error signal and the filter delivers a channel estimate to the channel equalizer. Weighting factors are generated with the aid of the error signal and the two aforementioned delta-metric values are co-weighted to a common delta-metric value with the aid of weighting factors, this common delta-metric value being used to generate the estimated symbols. The use of the weighting factors improves the metric calculation and enables the channel estimating filter and the channel equalizer to be relatively simple. The insertion of the zero-value symbols simplifies the generation of the weighting factors and the adaptation of the channel estimating filter.
摘要翻译： 在数字时分传输系统中，接收机接收符号率低于系统信道带宽的信号。 相关和采样电路接收基带信号，每个符号时间多次采样信号，执行信道相关，产生信道估计，并将一次采样信号采样到具有每个符号时间的两个值的观测信号。 信道均衡器执行分数维特比算法，其利用每个状态转换的两个Δ度量值并产生估计符号。 信道估计滤波器接收交替的零值符号和估计符号的符号序列，并产生估计信号。 信道估计滤波器借助于误差信号进行调整，并且滤波器向信道均衡器传送信道估计。 借助于误差信号产生加权因子，并且借助于加权因子将两个前述的delta度量值共同加权到公共的delta度量值，该公共的delta度量值用于生成估计符号 。 使用加权因子改善了度量计算，使信道估计滤波器和信道均衡器相对简单。 零值符号的插入简化了加权因子的生成和信道估计滤波器的适应。
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公开(公告)号：US06724813B1
公开(公告)日：2004-04-20
申请号：US09172015
申请日：1998-10-14
IPC分类号： H04B138
CPC分类号： H04W72/02 , H04B7/2628 , H04W8/26 , H04W28/18 , H04W56/00 , H04W72/0406
摘要： In a communications system, communications resources are allocated in a dynamic, “as needed” fashion. No explicit signaling is needed to exchange information pertaining specifically to an allocated communications resource. Instead, resources are implicitly allocated by using one or more parameters known to both the radio access network and mobile station that are more or less unique to the mobile station. Such parameters are used to generate or address a communications resource for use by the mobile station. The parameters might, for example, be information readily acquired or communicated as a result of a synchronization procedure, a mobile station registration procedure, a mobile station access procedure, a paging procedure, etc. Example parameters may include a system frame number, a system identification, a radio access network identification, a base station identification, a cell identification, a mobile station-associated signature, an access reference number corresponding to the mobile station, a time instant when an acknowledgment message is received, etc.
摘要翻译： 在通信系统中，通信资源以动态的“必要”方式分配。 不需要明确的信令来交换与分配的通信资源有关的信息。 相反，通过使用对于移动台或多或少是唯一的无线电接入网络和移动台已知的一个或多个参数来隐含地分配资源。 这样的参数用于生成或寻址由移动台使用的通信资源。 这些参数可以是例如作为同步过程，移动站登记过程，移动站访问过程，寻呼过程等的结果容易获取或传达的信息。示例性参数可以包括系统帧号，系统 识别，无线接入网标识，基站识别，小区识别，移动台相关签名，与移动台对应的接入参考号码，接收确认消息的时刻等。
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公开(公告)号：US06535547B1
公开(公告)日：2003-03-18
申请号：US09324372
申请日：1999-06-02
申请人： Bo Lyckegård , Riaz Esmailzadeh , Johan Nyström , Erik Dahlman , Sandeep Chennakeshu , Karim Jamal
发明人： Bo Lyckegård , Riaz Esmailzadeh , Johan Nyström , Erik Dahlman , Sandeep Chennakeshu , Karim Jamal
IPC分类号： H04L2730
CPC分类号： H04W74/004 , H04J13/004 , H04W74/0833
摘要： A method for improving the performance of a random access communications system in a variable radio environment is disclosed, whereby at least one valid set of burst signatures is used for transmission by one or more mobile stations. Each set includes at least one signature with a different signature-length than the signatures in other sets. The different signature-lengths can be optimized for the operational environments involved (e.g., longer signatures for slower-moving mobile stations, and shorter signatures for high-speed mobile stations). Alternatively, at least one differentially-encoded signature is used for random access transmissions, in order to reduce the radio channel's sensitivity to large doppler spreads and frequency errors.
摘要翻译： 公开了一种用于在可变无线电环境中改善随机接入通信系统的性能的方法，由此至少一个有效的突发特征集合被一个或多个移动台用于传输。 每个集合包括与其他集合中的签名不同的签名长度的至少一个签名。 不同的签名长度可以针对所涉及的操作环境进行优化（例如，较慢移动的移动站的签名较长，以及用于高速移动站的较短的签名）。 或者，至少一个差分编码的签名用于随机接入传输，以便减少无线电信道对大多普勒扩展和频率误差的敏感性。
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4.发明授权
公开(公告)号：US5956368A
公开(公告)日：1999-09-21
申请号：US924709
申请日：1997-08-29
申请人： Karim Jamal , Riaz Esmailzadeh , Erik Dahlman
发明人： Karim Jamal , Riaz Esmailzadeh , Erik Dahlman
CPC分类号： H04B7/2628
摘要： With respect to a direct sequence, code division multiple access spread spectrum transmitter, symbol information relating to dedicated/common channels (such as the traffic or control channels) is spread to generate a plurality of corresponding dedicated/common channel intermediate signals. These intermediate signals are then summed to generate an output signal that is scrambled by a selected scrambling code. Symbol information relating to acquisition-related channels (such as synchronization information or the pilot or long code group code channels) is also spread to generate a plurality of corresponding acquisition-related intermediate signals. These acquisition-related intermediate signals are then selectively added to the scrambled output signal producing a downlink signal for multi-channel transmission over a communications medium sharing one transmission communications frequency.
摘要翻译： 对于直接序列，码分多址扩频发射机，与专用/公共信道（诸如业务或控制信道）相关的符号信息被扩展以产生多个对应的专用/公共信道中间信号。 然后将这些中间信号相加以产生被选择的扰码加扰的输出信号。 与采集相关信道（诸如同步信息或导频码或长码组码信道）相关的符号信息也被扩展以产生多个对应的采集相关中间信号。 这些采集相关的中间信号然后被选择性地添加到加扰的输出信号，产生用于在共享一个传输通信频率的通信介质上进行多信道传输的下行链路信号。
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公开(公告)号：US5754537A
公开(公告)日：1998-05-19
申请号：US613216
申请日：1996-03-08
申请人： Karim Jamal
发明人： Karim Jamal
IPC分类号： H04J3/00 , H04J3/17 , H04L12/56 , H04W28/26 , H04W72/10 , H04W74/00 , H04W74/04 , H04B7/212 , H04B7/26
摘要： A method and system for transmitting background noise information on a packet reservation multiple access radio channel. In the method and system, relative priorities are assigned to background noise data transmissions and speech data, or other data traffic, transmissions. The priorities are assigned so that the effect of background noise data transmissions on the delays and quality of speech data, or other data traffic, transmissions within the system is reduced.
摘要翻译： 一种用于在分组预留多址无线电信道上发送背景噪声信息的方法和系统。 在该方法和系统中，将相对优先级分配给背景噪声数据传输和语音数据或其他数据业务传输。 分配优先级，使得背景噪声数据传输对系统内的语音数据或其他数据业务传输的延迟和质量的影响减小。
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6.发明授权Method and system for determining the position of a mobile terminal in a CDMA mobile communications system 失效用于确定CDMA移动通信系统中的移动终端的位置的方法和系统
公开(公告)号：US6134228A
公开(公告)日：2000-10-17
申请号：US989491
申请日：1997-12-12
申请人： Mats Cedervall , Karim Jamal
发明人： Mats Cedervall , Karim Jamal
摘要： A method and system for use in determining the position of a mobile terminal in a CDMA mobile communications system is disclosed, whereby a different than usual spreading code is used when TOA measurements are being performed, but information is allowed to be transmitted while those TOA measurements are being performed. In one embodiment, the length of the different spreading codes used is equal to one symbol length. In a second embodiment, a mobile terminal uses a long spreading code and short spreading code prior to making TOA measurements. When TOA measurements are to be made, the serving base station orders the mobile terminal to change the spreading code by terminating the use of the long code and continuing use of the short code. Alternatively, when the TOA measurements are to be made, the serving base station orders the mobile terminal to substitute a second, predetermined short code for the long code being used, and to continue use of the first short code. The TOA measurements are then performed in at least three base stations, and the position of the mobile terminal is derived from this TOA information. The serving base station then orders the mobile terminal to resume normal operations using the long code.
摘要翻译： 公开了一种用于确定CDMA移动通信系统中的移动终端的位置的方法和系统，由此在正在执行TOA测量时使用不同于通常的扩展码，但是允许信息被发送，而那些TOA测量 正在执行。 在一个实施例中，所使用的不同扩展码的长度等于一个符号长度。 在第二实施例中，在进行TOA测量之前，移动终端使用长扩展码和短扩展码。 当要进行TOA测量时，服务基站通过终止使用长码并继续使用短码来命令移动终端改变扩展码。 或者，当要进行TOA测量时，服务基站命令移动终端替换所使用的长码的第二预定短码，并继续使用第一短码。 然后在至少三个基站中执行TOA测量，并且从该TOA信息导出移动终端的位置。 服务基站然后使用长码命令移动终端恢复正常操作。
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7.发明授权
公开(公告)号：US5831978A
公开(公告)日：1998-11-03
申请号：US731756
申请日：1996-10-18
CPC分类号： H04B7/264
摘要： The present invention discloses a method for transmitting a plurality of information streams having variable data rates. A plurality of information streams are multiplexed together into a common information frame. The information is channel encoded and multiplexed with a number of overhead bits including encoding information on the multiplexed frame. The multiplexed frame is then demultiplexed into at least one channel frames that are each transmitted over a separate code channel such that the first code channel always includes the overhead bit data.
摘要翻译： 本发明公开了一种用于发送具有可变数据速率的多个信息流的方法。 多个信息流被多路复用到公共信息帧中。 该信息被信道编码并与多个开销位复用，包括多路复用帧上的编码信息。 然后将经复用的帧解复用为至少一个信道帧，每个信道帧通过单独的码信道发送，使得第一码信道始终包括开销比特数据。
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8.发明授权Method and device for estimating transmitted signals in a receiver in digital signal transmission operations 失效用于在数字信号传输操作中估计接收机中的发射信号的方法和装置
公开(公告)号：US5533067A
公开(公告)日：1996-07-02
申请号：US264491
申请日：1994-06-23
申请人： Karim Jamal , Bjorn Gudmundson , Gustav Brismark
发明人： Karim Jamal , Bjorn Gudmundson , Gustav Brismark
CPC分类号： H03H21/0012 , H04L25/03261 , H04L25/0212 , H04L7/042
摘要： 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. Coefficients are generated in a metric calculation filter, by convolving the channel estimate with the prefilter and are used to generate the estimated symbols. The transmission channel, excluding the prefilter, is estimated explicitly so as to enable fast channel changes to be followed. The use of the weight factors enables a short channel estimate to be used. The insertion of the zero-value symbols simplifies adaptation of the channel estimate.
摘要翻译： 在数字信号传输系统中，接收机接收信号，其中系统的信号带宽超过系统符号速率。 相关和采样电路接收基带信号，每个符号时间八次采样信号，相关，产生信道估计并对采样信号进行下采样以形成观测信号。 该信号在预滤波器中被滤波，其输出以符号速率被采样，并且将获得的信号传送到信道均衡器，该信道均衡器执行具有非二次度量计算的维特比算法并生成估计符号。 信道估计滤波器接收包含交替的零值符号和估计符号的符号序列，并产生估计信号。 产生误差信号并用于适应信道估计，并产生权重因子。 作为信道估计和权重因子的函数产生预滤波器的系数。 在度量计算滤波器中生成系数，通过将信道估计与预滤波器进行卷积，并用于生成估计的符号。 不包括预过滤器的传输通道被明确估计，以便能够跟随快速通道改变。 使用权重因子可以使用短信道估计。 零值符号的插入简化了信道估计的适应。
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公开(公告)号：US06185244B2
公开(公告)日：2001-02-06
申请号：US09129151
申请日：1998-08-05
IPC分类号： H04L2730
CPC分类号： H04B1/7083 , H04J13/107 , H04L7/043
摘要： A special coding scheme is disclosed for more effectively acquiring a long code and frame timing during a cell search in a CDMA communications system. A code set of length M Q-ary code words including symbols from a set of Q short codes is defined with certain properties. The primary property to be satisfied is that no cyclic shift of a code word yields a valid code word. The other properties to be satisfied are that there is a one-to-one mapping between a long code message and a valid code word, and a decoder should be able to find both the random shift (thereby implicitly finding the frame timing) and the transmitted code word (i.e., its associated long code indication message) in the presence of interference and noise, with some degree of accuracy and reasonable complexity.
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公开(公告)号：US5901186A
公开(公告)日：1999-05-04
申请号：US737765
申请日：1996-10-28
申请人： Karim Jamal , Fredrik Jansson
发明人： Karim Jamal , Fredrik Jansson
CPC分类号： H04L1/20 , H04L1/0057 , H04L1/0071 , H04L1/201 , H04L25/03178
摘要： In a digital radio communication system in which information is transmitted and received in time slots and some bits of each received audio frame is interleaved over at least two time slots and other bits in each audio frame at are non-interleaved, bad received audio frames are detected by detecting possible bit errors in a channel encoded non-interleaved bit sequence in each received time slot. If bit errors have been detected in this bit sequence a bad received frame is indicated.
摘要翻译： PCT No.PCT / SE95 / 00423 Sec。 371日期1996年10月28日第 102（e）日期1996年10月28日PCT 1995年4月19日PCT PCT。 WO95 / 30282 PCT公开 日期：1995年11月9日在数字无线电通信系统中，其中在时隙中发送和接收信息，并且每个接收的音频帧的某些比特在至少两个时隙上进行交织，并且每个音频帧中的其他比特是非交织的， 通过检测每个接收到的时隙中的信道编码的非交错比特序列中的可能比特错误来检测不良的接收音频帧。 如果在该位序列中检测到位错误，则指示错误的接收帧。
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