-
公开(公告)号：US06760361B2
公开(公告)日：2004-07-06
申请号：US09742714
申请日：2000-12-20
IPC分类号： H04L2732
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.
摘要翻译： 公开了一种特殊的编码方案，用于在CDMA通信系统中的小区搜索期间更有效地获取长码和帧定时。 使用某些属性来定义包括来自一组Q短码的符号的长度为M个Q字节码字的码组。 要满足的主要特征是代码字的循环移位不产生有效的代码字。 要满足的其他属性是在长码消息和有效码字之间存在一对一的映射，并且解码器应该能够找到随机移位（从而隐含地找到帧定时）和 在存在干扰和噪声的情况下，传输码字（即其相关联的长码指示消息）具有一定程度的准确性和合理的复杂度。
-
2.发明授权
公开(公告)号：US5930366A
公开(公告)日：1999-07-27
申请号：US921135
申请日：1997-08-29
申请人： Karim Jamal , Riaz Esmailzadeh , Yi-Pin Eric Wang
发明人： Karim Jamal , Riaz Esmailzadeh , Yi-Pin Eric Wang
IPC分类号： H04B1/7073 , H04B1/7075 , H04B1/7083 , H04B7/26 , H04Q7/38 , H04L9/00
CPC分类号： H04B1/70752 , H04B1/70735 , H04B1/7083 , H04B2201/70701
摘要： Each transmission frame within a spread spectrum communications system relating to synchronization code transmission is divided into a plurality of slots. Each of the slots includes a primary (pilot) code c.sub.p and a secondary (combined) code c.sub.s/lci that includes information identifying or indicative of both a frame timing and a scrambling code for synchronization. This information concerning frame timing and scrambling code may be encoded in the combined code c.sub.s/lci itself, as well as in the modulation values of the sequences of plural combined codes within a frame. Alternatively, the information is encoded in the sequence of plural combined codes c.sub.s/lci transmitted in each frame, as well as in the modulated values of the sequences of plural combined codes within a frame. As yet another alternative, the information is encoded in the timing of the combined code c.sub.s/lci transmission within each slot of the frame relative to its associated primary code c.sub.p.
摘要翻译： 与同步码传输相关的扩频通信系统内的每个传输帧被划分成多个时隙。 每个时隙包括主（代码）代码+ E，ovs c + EE p和辅助（组合）代码+ E，ovs c + EE s / lci，其包括识别或指示帧定时和加扰 同步代码 关于帧定时和扰码的信息可以以组合码+ E，ovs c + EE s / lci本身以及帧内的多个组合码的序列的调制值进行编码。 或者，信息按照在每帧中发送的多个组合码+ E，ovs + EE s / lci的序列以及帧内的多个组合码的序列的调制值进行编码。 作为另一个替代方案，信息在帧相对于其相关联的主代码+ E，ovs c + EE p的每个时隙内的组合代码+ E，ovs c + EE s / lci传输的定时编码。
-
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.
-
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。
-
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。
-
6.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。
-
公开(公告)号：US06597675B1
公开(公告)日：2003-07-22
申请号：US09148224
申请日：1998-09-04
申请人： Riaz Esmailzadeh , Karim Jamal , Christiaan Roobol
发明人： Riaz Esmailzadeh , Karim Jamal , Christiaan Roobol
IPC分类号： H04B7216
CPC分类号： H04L1/1867 , H04B1/707 , H04B2201/70701 , H04J13/107 , H04W28/06 , H04W72/0466 , H04W74/004 , H04W74/0833
摘要： A method is disclosed for processing mobile-originated random access requests in a mobile telecommunications system that randomly selects new signatures for re-transmissions in the event that collisions have occurred. As such, the random access re-transmissions are randomized over the signature domain instead of just over the time domain. Consequently, the disclosed invention significantly shortens random access delays caused by collisions or erroneous arrivals at base station receivers, and also significantly reduces the interval between random access re-transmissions.
摘要翻译： 公开了一种用于在移动电信系统中处理移动发起的随机接入请求的方法，该方法在发生冲突的情况下随机选择用于重传的新签名。 因此，随机访问重传是通过签名域而不是仅在时域上随机化的。 因此，所公开的发明显着缩短了由基站接收机的冲突或错误到达引起的随机接入延迟，并且还显着地减少了随机接入重传之间的间隔。
-
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。
-
9.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。
-
10.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。
-
-
-
-
-
-
-
-
-
搜索结果
19 条记录 (耗时 0.019 秒)
