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公开(公告)号：EP0948081A1
公开(公告)日：1999-10-06
申请号：EP98302654.3
申请日：1998-04-03
CPC分类号： H04B7/0845 , H01Q3/2605 , H01Q3/2682
摘要： In order to reduce the effect of multipath propagation, diversity antennas have been proposed in which each antenna in an array has a respective branch tapped delay line in which the tap output signals are weighted and summed. The sums then need to be combined in a way that improves the signal to noise ratio.
A diversity antenna system is disclosed in which the branch weights W 1S to W MS are determined for each branch by:
comparing the real part of the summed tap output signals y 1 to y M for the branch with a set level;
ascribing a symbol value of logical zero to those summed branch tap output signals which fall to one side of the set level and ascribing a symbol value of logical one to those summed branch tap output signals which fall to the other side of the set level;
calculating the mean of the levels of those signals ascribed the value logical zero and the mean of the levels of those signals ascribed the value logical one;
calculating the distance between the level of each signal ascribed the value logical zero and the respective mean, and the level of each signal ascribed the value logical one and the respective mean;
calculating the sum of the distances from the means;
calculating the distances of the levels of all signals from the set level;
calculating the sum of the distances of the levels of all signals from the set level;
calculating the ratio of the sum of the distances from the means to the sum of the distances of the levels of all symbols from the set level; and
setting the branch weight W 1S to W MS dependent on the inverse of the ratio.摘要翻译： 为了减少多径传播的影响，已经提出了分集天线，其中阵列中的每个天线具有相应的分支抽头延迟线，其中抽头输出信号被加权和求和。 这些总和需要以提高信噪比的方式组合。 公开了一种分集天线系统，其中通过以下方式确定每个分支的分支权重W1S至WMS：将分支的求和抽头输出信号y1至yM的实部与设定电平进行比较; 将逻辑零的符号值归属到落在设定电平的一侧并将逻辑1的符号值归属到落在设定电平的另一侧的那些相加的分支抽头输出信号的那些相加的分支抽头输出信号; 计算归因于逻辑零值的那些信号的电平的平均值和归因于逻辑值的那些信号的电平的平均值; 计算归属于逻辑零值的每个信号的电平与相应的平均值之间的距离，以及归因于逻辑1和相应平均值的每个信号的电平; 计算与装置距离的总和; 计算所有信号的电平与设定电平的距离; 计算所有信号的电平距离与设定电平的和; 计算从装置到所有符号的等级距离与装置水平的距离之和的总和的比率; 并且将分支权重W1S设置为取决于比率的倒数的WMS。
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公开(公告)号：EP0953850B1
公开(公告)日：2005-03-16
申请号：EP98302657.6
申请日：1998-04-03
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3.发明公开Process for assigning channels in a cellular radio communication system 失效在einem zellularen Funkkommunikationssystem的Verfahren zur Kanalzuweisung
公开(公告)号：EP0948229A1
公开(公告)日：1999-10-06
申请号：EP98302652.7
申请日：1998-04-03
CPC分类号： H04W16/00 , H01Q3/2611 , H04W16/28 , H04W28/16 , H04W64/00 , H04W72/04 , H04W72/082 , H04W88/08 , H04W92/20
摘要： A process is disclosed for assigning channels for communications between base stations, each having an array of antennas, and mobile terminals in a cellular radio communication system. The process comprises:
determining the approximate positions of mobile stations relative to one or more antennas;
configuring the array of antennas at a first base station to produce a major lobe and nulls in its polar diagram, the lobe being directed at the approximate position of a first mobile terminal in the first cell;
assigning a data communication channel between the first base station and the first mobile terminal; and
reassigning that data channel for communications in a second cell between a second base station and a second mobile terminal at the approximate position of which the major lobe at the first base station is not directed.
The process provides better discrimination against interferers and/or allows channels to be reassigned in closer cells than is conventional.摘要翻译： 公开了一种用于为蜂窝无线电通信系统中的基站之间的通信分配信道的过程，每个基站具有天线阵列和移动终端。 该过程包括：确定移动台相对于一个或多个天线的近似位置; 在第一基站处配置天线阵列以在其极坐标图中产生主波瓣和零点，所述波瓣指向第一小区中的第一移动终端的近似位置; 在所述第一基站和所述第一移动终端之间分配数据通信信道; 并且在第二基站和第二移动终端之间的第二小区中在第一基站的主波瓣的大致位置不被引导的情况下重新分配该数据信道。 该方法提供对干扰源的更好的区分和/或允许在比常规的更细的细胞中重新分配信道。
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公开(公告)号：EP0948171B1
公开(公告)日：2004-12-29
申请号：EP98302655.0
申请日：1998-04-03
CPC分类号： H04L25/03038 , H04L1/06 , H04L1/20
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5.发明公开Channel estimation using a sliding window technique 失效Kanalschätzungunter Verwendung einer Gleitfenstertechnik
公开(公告)号：EP0954142A1
公开(公告)日：1999-11-03
申请号：EP98303326.7
申请日：1998-04-28
IPC分类号： H04L25/02
CPC分类号： H04L25/0216 , H04L25/0228
摘要： The invention provides a method for channel estimation in mobile radio communications which adaptively compensates for channel distortion on a block-by-block basis. The discrete-time channel impulse response is initially estimated with a given length and then truncated by using a sliding window. A cost function associated with the window is measured as the length and position of the window is adjusted over the channel impulse response and the cost function is compared with a threshold. The invention provides means to and a method for adaptively adjusting the length of the window L T and the corresponding number of states in the equalizer, 2 L T - 1 if appropriate.
摘要翻译： 本发明提供一种用于移动无线电通信中的信道估计的方法，该方法在逐块的基础上自适应地补偿信道失真。 离散时间信道脉冲响应最初以给定长度估计，然后通过使用滑动窗口截断。 与窗口相关联的成本函数被测量为在通道脉冲响应上调整窗口的长度和位置，并将成本函数与阈值进行比较。 本发明提供了适用于如何适应地自适应地调节窗口LT的长度和均衡器2L-1中相应数量的状态的方法和方法。
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6.发明公开Direction determination in cellular mobile communications network 失效Richtungsbestimmung在einem zellularen mobilen Kommunikationssystem
公开(公告)号：EP0953850A1
公开(公告)日：1999-11-03
申请号：EP98302657.6
申请日：1998-04-03
摘要： In order to improve carry to interference ratios on the down link in mobile communications networks, it is proposed to transmit on the down link in a beam steered at the base station towards the mobile terminal. In order to do that it is necessary to know in which direction the mobile terminal is located.
There is disclosed a method of ascribing a direction to the location of a mobile terminal from an antenna array.
A sequence of symbols from each antenna 2 in the array, is stored. The sequence contains a known training sequence. The sequence is space processed iteratively so as to produce the effect of the array having a major lobe in its polar diagram at a plurality of different successive directions. A set of crosscorrelation metrics is derived by calculating a crosscorrelation metric for each direction between the combined signals and the known training sequence. The ratio is calculated of the crosscorrelation metric for each direction to the power of the combined signals for that direction to produce a set of direction metrics. A direction is ascribed to the mobile terminal using the direction metrics to determine which direction is most likely.摘要翻译： 为了提高移动通信网络中的下行链路的承载与干扰比，提出了在基站向着移动终端转发的波束中的下行链路上进行发送。 为了做到这一点，有必要知道移动终端位于哪个方向。 公开了一种从天线阵列将方向归属到移动终端的位置的方法。 存储阵列中每个天线2的符号序列。 该序列包含已知的训练序列。 该序列被迭代地进行空间处理，以便在多个不同的连续方向上产生其极坐标图中具有主瓣的阵列的影响。 通过计算组合信号和已知训练序列之间的每个方向的互相关度量来导出一组互相关度量。 该比率被计算为每个方向的相关度量与该方向的组合信号的功率以产生一组方向度量。 方向归因于移动终端使用方向度量来确定最有可能的方向。
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7.发明公开Adaptive equaliser using known and pseudo-known symbols 失效Adaptator Entzerrer unter Verwendung von bekannten und pseudobekannten Symbolen
公开(公告)号：EP0948171A1
公开(公告)日：1999-10-06
申请号：EP98302655.0
申请日：1998-04-03
CPC分类号： H04L25/03038 , H04L1/06 , H04L1/20
摘要： A method of calculating the weights for a tapped delay line space/time processor is disclosed. Those symbols having levels for which it is most certain whether they represent a logical zero or a logical one, are used in addition to the training sequence to set the tap weights.
摘要翻译： 公开了一种计算抽头延迟线空间/时间处理器的权重的方法。 除了训练序列之外，还使用具有最确定的水平的那些符号是否表示逻辑零或逻辑零的符号来设置抽头权重。
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公开(公告)号：EP0948082A1
公开(公告)日：1999-10-06
申请号：EP98302656.8
申请日：1998-04-03
CPC分类号： H04B7/0845 , H01Q3/2605 , H01Q3/2682 , H04B7/0854
摘要： Adaptive antennas are used to counter dispersion due to multipath propagation and interference from other stations using the same frequency. Each of the antennas in the array has a respective tapped delay line in which the tap output signals are weighted and summed. In a known theoretical proposal, the weights W are determined as follows: w = R xx -1 r xd where R xx is the autocorrelation matrix of the input to the system and r xd is the crosscorrelation vector of the input signal and the known sequence. In practice estimates of R xx and r xd may be obtained by averaging the instantaneous matrices and vectors over the training sequence.
A method to provide an improved estimate of R xx is disclosed in which the estimate of R xx is refined by calculating a new estimate R xx (new) = (R xx + β.I x trace(R xx )) where β is a scalar value and I is the identity matrix, and wherein successive iterations are evaluated by:
comparing the real part of the summed tap output signals with a set level;
ascribing a symbol value of logical zero to those summed tap output signals which fall to one side of the set level and ascribing a symbol value of logical one to those summed tap output signals which fall to the other side of the set level;
calculating the mean of the levels of those signals ascribed the value logical zero and the mean of the levels of those signals ascribed the value logical one;
calculating the distance between the level of each signal ascribed the value logical zero and the respective mean, and the level of each signal ascribed the value logical one and the respective mean;
calculating the sum of the distances from the means;
calculating the distances of the levels of all signals from the set level;
calculating the sum of the distances of the levels of all signals from the set level;
calculating the ratio of the sum of the distances from the means to the sum of the distances of the levels of all symbols from the set level.摘要翻译： 自适应天线用于对来自其他站使用相同频率的多径传播和干扰的色散进行计数。 阵列中的每个天线具有相应的抽头延迟线，其中抽头输出信号被加权并相加。 在已知的理论方案中，权重W确定如下：其中Rxx是系统输入的自相关矩阵，rxd是输入信号和已知序列的互相关向量。 在实践中，Rxx和rxd的估计可以通过对训练序列上的瞬时矩阵和向量进行平均来获得。 公开了一种提供Rxx的改进估计的方法，其中Rxx的估计是通过计算新的估计值而得到改进的，其中β是标量值，I是单位矩阵，并且其中连续的迭代被评估： 总和的抽头输出信号的实部具有设定电平; 将逻辑零的符号值归属于落入设定电平的一侧并将逻辑1的符号值归一化到落在设定电平的另一侧的那些相加的抽头输出信号的相加的抽头输出信号; 计算归因于逻辑零值的那些信号的电平的平均值和归因于逻辑值的那些信号的电平的平均值; 计算归属于逻辑零值的每个信号的电平与相应的平均值之间的距离，以及归因于逻辑1和相应平均值的每个信号的电平; 计算与装置距离的总和; 计算所有信号的电平与设定电平的距离; 计算所有信号的电平距离与设定电平的和; 计算从装置到所有符号的电平距离与设定电平的距离之和的总和的比率。
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