公开(公告)号：US5222101A

公开(公告)日：1993-06-22

申请号：US695524

申请日：1991-05-03

申请人： Sirikiat Ariyavisitakul ,  Hamilton W. Arnold

发明人： Sirikiat Ariyavisitakul ,  Hamilton W. Arnold

IPC分类号： H04B7/005

CPC分类号： H04B7/005

摘要： A receiver for use in the port or portable units in a TDM/TDMA digital radio communications system is disclosed which incorporates an equalizer (107) to compensate for channel distortion due to multipath delay spread. Each received burst of information is oversampled at a multiple of the symbol rate and stored in a buffer memory (105). A joint estimator (106) processes the stored burst by operating on a known training sequence of bits within the burst to determine burst timing (where the burst actually begins) and the symbol timing (the optimum sample sample per oversampled symbol to be used for detection purposes). The estimator also determines whether the stored burst should be processed in a time-forward or time-reversed order. The joint estimator includes plural training equalizers (201), each of which is associated with an assumed burst location and each of which attempts to converge on the known training sequence as the stored sequence is circulated plural times through the equalizers in both the time-forward and time-reversed order. Burst and symbol timing and the optimum processing order are determined from the location of the training equalizer which converges with the minimum mean-square error. The determined burst and symbol timing, and the selected processing order, are passed to the buffer storage for read-out, in that selected order, of the stored burst information in that order to the input of the main receiver equalizer (107). That main equalizer is initially set with the equalizer parameters determined by the training equalizer yielding the minimum mean-square error. The equalizers can either be conventional fractionally-spaced decision feedback equalizers or can be phase equalizers, which operate on the received phase angle.

摘要翻译： 公开了一种用于TDM / TDMA数字无线电通信系统中的端口或便携式单元的接收机，其包括均衡器（107）以补偿由于多径延迟扩展引起的信道失真。 每个接收的信息突发以符号率的倍数过采样并存储在缓冲存储器（105）中。 联合估计器（106）通过对脉冲串内的已知训练序列的比特进行操作来确定脉冲串定时（脉冲串实际开始的地方）和符号定时（每个过采样符号用于检测的最​​佳采样样本） 目的）。 估计器还确定是否应以时间或时间顺序处理所存储的脉冲串。 联合估计器包括多个训练均衡器（201），每个训练均衡器（201）与假定的突发位置相关联，并且当所存储的序列在时间前进中通过均衡器多次循环时，每个训练均衡器试图收敛于已知的训练序列 和时间顺序。 从最小均方误差收敛的训练均衡器的位置确定突发和符号定时以及最佳处理顺序。 所确定的突发和符号定时以及所选择的处理顺序被传送到缓冲存储器，以按照所选择的顺序将存储的突发信息按顺序读出到主接收机均衡器（107）的输入端。 初始设置主均衡器，均衡器参数由训练均衡器确定，产生最小均方误差。 均衡器可以是传统的分数间隔的判决反馈均衡器，也可以是对接收的相位角进行操作的相位均衡器。

公开(公告)号：US08254507B2

公开(公告)日：2012-08-28

申请号：US11864611

申请日：2007-09-28

申请人： Joonsuk Kim ,  Sirikiat Ariyavisitakul ,  Nambirajan Seshadri

发明人： Joonsuk Kim ,  Sirikiat Ariyavisitakul ,  Nambirajan Seshadri

IPC分类号： H04B7/10

CPC分类号： H04B7/0634 ,  H04B7/0669 ,  H04B7/068 ,  H04B7/0891 ,  H04L1/0003 ,  H04L1/04 ,  H04L1/0675 ,  H04L5/0007 ,  H04L5/0053 ,  H04L25/0224

摘要： Aspects of a system for STBC/SFBC in a communication system using angle feedback may include a receiver, which enables reception of signals via a plurality of receiving antennas. The receiver may enable computation of a rotation factor value based on the received signals and utilization of the computed rotation factor value to receive subsequent signals via the plurality of receiving antennas. The received signals may comprise preamble data. The receiver may enable computation of channel estimate values based on the received preamble data. A rotation angle value may be computed based on the computed channel estimate values. The rotation factor value may be computed based on the computed rotation angle value. The receiver may enable transmission of feedback information comprising the computed rotation factor and/or the computed rotation angle.

摘要翻译： 在使用角度反馈的通信系统中用于STBC / SFBC的系统的方面可以包括能够经由多个接收天线接收信号的接收机。 接收机可以使得能够基于所接收的信号来计算旋转因子值，并且利用所计算的旋转因子值以经由多个接收天线接收后续信号。 所接收的信号可以包括前导码数据。 接收机可以使得能够基于所接收的前导码数据来计算信道估计值。 可以基于所计算的信道估计值来计算旋转角度值。 可以基于计算的旋转角度值来计算旋转因子值。 接收机可以实现包括所计算的旋转因子和/或所计算的旋转角度的反馈信息的传输。

公开(公告)号：US20090066577A1

公开(公告)日：2009-03-12

申请号：US12190272

申请日：2008-08-12

申请人： Joonsuk Kim ,  Sirikiat Ariyavisitakul

发明人： Joonsuk Kim ,  Sirikiat Ariyavisitakul

IPC分类号： H01Q3/00 ,  H04L25/49

CPC分类号： H04L25/03343 ,  H04L1/0026 ,  H04L1/0618 ,  H04L2025/03426 ,  H04L2025/03802

摘要： A method and system for beamforming in a multiple user multiple input multiple output (MIMO) communication system using a codebook may include a processor in a node B that enables generation of an interference cancellation matrix (WR). The interference cancellation matrix, also referred to as a matched filter, may enable a composite signal (Y) to be represented as a plurality of subsidiary signals (yi), each of which is transmitted by the node B for reception at a corresponding ith UE station. Each of the subsidiary signals yi may be generated based on a corresponding one of a plurality of data stream signals (xi). The processor may enable generation of a precoding matrix (WT) based on the interference cancellation matrix. A transmitter within the node B may enable generation of a plurality of signals based on the preceding matrix. The signals may be transmitted via a wireless communication medium.

摘要翻译： 在使用码本的多用户多输入多输出（MIMO）通信系统中的波束成形的方法和系统可以包括能够产生干扰消除矩阵（WR）的节点B中的处理器。 也称为匹配滤波器的干扰消除矩阵可以使得复合信号（Y）能够被表示为多个辅助信号（yi），每个辅助信号由节点B发送以在对应的第i个UE处接收 站。 辅助信号yi中的每一个可以基于多个数据流信号（xi）中的对应的一个生成。 处理器可以使得能够基于干扰消除矩阵生成预编码矩阵（WT）。 节点B内的发射机可以使得能够基于先前的矩阵生成多个信号。 信号可以经由无线通信介质发送。

公开(公告)号：US20050207508A1

公开(公告)日：2005-09-22

申请号：US10608679

申请日：2003-06-27

申请人： Manoneet Singh ,  Sirikiat Ariyavisitakul

发明人： Manoneet Singh ,  Sirikiat Ariyavisitakul

IPC分类号： H04B7/08 ,  H04L1/02

CPC分类号： H04B7/086 ,  H04B7/084 ,  H04B7/0845

摘要： A spatial diversity receiver and method for determining a multichannel combined symbol timing marker that identifies an energy concentration for a combination of channel delay spreads in order to reduce the complexity of equalization. The receiver includes two or more receiver chains having spatially diverse antennas; a multichannel combined timer; and a multichannel combined equalizer for receiving wireless signals through two or more signal channels. The multichannel combined timer combines energies corresponding to the channel impulse response coefficients for all the channels for determining a series of multichannel combined metrics having associated index cursors, and then determines the multichannel combined symbol timing marker from the index cursor for the largest of the metrics. The symbol timing marker synchronizes the received symbols issued to the equalizer jointly to the energy concentration for the delay spreads combined for all the channels.

摘要翻译： 一种空间分集接收机和方法，用于确定识别用于信道延迟扩展的组合的能量集中的多信道组合符号定时标记，以便降低均衡的复杂度。 接收机包括具有空间多样的天线的两个或多个接收器链; 多通道组合定时器; 以及用于通过两个或更多个信号信道接收无线信号的多通道组合均衡器。 多通道组合定时器组合对应于所有通道的信道脉冲响应系数的能量，用于确定具有相关联的指标光标的一系列多通道组合度量，然后从用于最大量度的索引光标确定多通道组合符号定时标记。 符号定时标记将发送到均衡器的接收符号与用于所有信道的延迟传播的能量集中联合。

公开(公告)号：US5936754A

公开(公告)日：1999-08-10

申请号：US756929

申请日：1996-12-02

申请人： Sirikiat Ariyavisitakul ,  Sheryl Leigh Woodward

发明人： Sirikiat Ariyavisitakul ,  Sheryl Leigh Woodward

IPC分类号： H04B10/12

CPC分类号： H04B10/25758

摘要： A transmission system for backhauling CDMA signals from remote antennas to the centralized base station of a wireless communication system includes a laser transmitter and an optical receiver coupled to an optical fiber. Wireless signals are backhauled to the central base station without degrading signal quality, and with minimal signal processing performed at the remote antenna site. The RF drive current driving the laser transmitter is kept above a predetermined level to prevent noise caused by optical feedback into the laser transmitter caused by Rayleigh backscatter in the optical fiber. A method of testing the optical link is presented which avoids the expense of using a real CDMA system to test each link. The testing method enables the dynamic range of inexpensive, unisolated, uncooled lasers in the optical link to be increased so the optical link can cost-effectively backhaul the CDMA signals.

摘要翻译： 用于将CDMA信号从远程天线回传到无线通信系统的集中式基站的传输系统包括激光发射机和耦合到光纤的光接收机。 无线信号被回传到中央基站，而不降低信号质量，并且在远程天线位置执行最少的信号处理。 将激光发射器驱动的RF驱动电流保持在预定水平以上，以防止由光纤中的瑞利反向散射引起的由光反馈引入到激光发射器中的噪声。 提出了测试光链路的方法，其避免了使用真实CDMA系统来测试每个链路的费用。 该测试方法使得能够增加光链路中廉价的，非隔离的，未冷却的激光器的动态范围，使得光链路能够成本有效地回传CDMA信号。

公开(公告)号：US5794153A

公开(公告)日：1998-08-11

申请号：US578121

申请日：1995-12-26

申请人： Sirikiat Ariyavisitakul ,  Lawrence Joel Greenstein

发明人： Sirikiat Ariyavisitakul ,  Lawrence Joel Greenstein

IPC分类号： H04B17/00 ,  H04W16/32 ,  H04W88/08 ,  H04B7/00

CPC分类号： H04W16/32 ,  H04B17/327 ,  H04W88/085

摘要： Average local traffic load in a simulcast radio system is estimated to achieve efficient resource sharing and dynamic reconfiguration of the simulcast areas. A method for estimating the average local traffic load uses relative power measurements at each radio port (or distributed antenna element). The estimating method is applicable to both code-division multiple access (CDMA) and time-division multiple access (TDMA) systems. The method provides accurate estimates of the actual radio port traffic over various system conditions, while requiring only an approximate knowledge of the radio propagation environment.

摘要翻译： 估计联播无线电系统中的平均本地流量负载可以实现有效的资源共享和联播区域的动态重新配置。 用于估计平均本地业务负载的方法使用在每个无线端口（或分布式天线元件）处的相对功率测量。 该估计方法适用于码分多址（CDMA）和时分多址（TDMA）系统。 该方法提供了在各种系统条件下实际无线电端口业务的精确估计，同时仅需要对无线电传播环境的近似知识。

公开(公告)号：US09036516B2

公开(公告)日：2015-05-19

申请号：US13313297

申请日：2011-12-07

申请人： Mark Kent ,  Vinko Erceg ,  Jun Zheng ,  Sirikiat Ariyavisitakul

发明人： Mark Kent ,  Vinko Erceg ,  Jun Zheng ,  Sirikiat Ariyavisitakul

IPC分类号： H04W72/04 ,  H04W24/10

CPC分类号： H04W24/10 ,  H04B17/24 ,  H04W72/0453

摘要： In transmit pre-coding, a bandwidth and a feedback period to one or more CQI reporting units and a bandwidth and a feedback period to one or more PMI reporting units are assigned, respectively. Sub-divisions in time and/or frequency corresponding to the assigned bandwidths and the assigned feedback periods are dynamically adjusted based at least on uplink channel state information corresponding to the bandwidth and the feedback period assigned to the CQI reporting units, and the bandwidth and the feedback period assigned to the PMI reporting units. One or more feedback messages are generated based at least on the channel state information over the adjusted sub-divisions in time and/or frequency corresponding to the CQI reporting units and to the PMI reporting units, respectively. The bandwidth and/or the feedback period may be assigned based on the channel state information or as a function of a feedback rate.

摘要翻译： 在发送预编码中，分配给一个或多个CQI报告单元的带宽和反馈周期以及到一个或多个PMI报告单元的带宽和反馈周期。 至少基于对应于分配给CQI报告单元的带宽和反馈周期的上行链路信道状态信息来动态地调整与分配的带宽和分配的反馈周期相对应的时间和/或频率的子部分，并且带宽和 反馈期分配给PMI报告单位。 至少基于经调整的子部分的信道状态信息，分别对应于CQI报告单元和对应于PMI报告单元的时间和/或频率生成一个或多个反馈消息。 可以基于信道状态信息或作为反馈速率的函数来分配带宽和/或反馈周期。

公开(公告)号：US08982969B2

公开(公告)日：2015-03-17

申请号：US11864672

申请日：2007-09-28

申请人： Mark Kent ,  Vinko Erceg ,  Jun Zheng ,  Sirikiat Ariyavisitakul ,  Uri Landau

发明人： Mark Kent ,  Vinko Erceg ,  Jun Zheng ,  Sirikiat Ariyavisitakul ,  Uri Landau

IPC分类号： H04L27/28 ,  H04B7/06 ,  H04L1/00

CPC分类号： H04B7/066 ,  H04B7/0632 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/0641 ,  H04L1/0026 ,  H04L1/0027

摘要： Aspects of a method and system for CQI/PMI feedback for precoded MIMO systems utilizing differential codebooks may include generating one or more feedback messages for one or more Channel Quality Indicator (CQI) reporting units based on at least channel state information associated with the one or more CQI reporting units. One or more differential feedback messages may be generated for one or more Pre-coding Matrix Index (PMI) reporting units based on at least channel state information associated with the one or more PMI reporting units, wherein the one or more PMI reporting units span a useable bandwidth. A bandwidth and a feedback period may be assigned to each of the one or more CQI reporting units and the one or more PMI reporting units to define the one or more CQI reporting units and the one or more PMI reporting units.

摘要翻译： 基于使用差分码本的预编码MIMO系统的用于CQI / PMI反馈的方法和系统的方面可以包括基于至少与该一个或多个信道质量指示符（CQI）报告单元相关联的信道状态信息为一个或多个信道质量指示符（CQI）报告单元生成一个或多个反馈消息 更多的CQI报告单位。 至少基于与一个或多个PMI报告单元相关联的信道状态信息，可以为一个或多个预编码矩阵索引（PMI）报告单元生成一个或多个差分反馈消息，其中一个或多个PMI报告单元跨越 可用带宽。 可以将一个或多个CQI报告单元和一个或多个PMI报告单元中的每一个分配带宽和反馈周期以定义一个或多个CQI报告单元和一个或多个PMI报告单元。

公开(公告)号：US08472543B2

公开(公告)日：2013-06-25

申请号：US12430286

申请日：2009-04-27

申请人： Sirikiat Ariyavisitakul ,  Eric Ojard ,  Jun Zheng

发明人： Sirikiat Ariyavisitakul ,  Eric Ojard ,  Jun Zheng

IPC分类号： H04L23/02

CPC分类号： H04L25/0204 ,  H04B7/0854 ,  H04B17/24 ,  H04B17/336 ,  H04B17/373 ,  H04L1/0009 ,  H04L1/0016 ,  H04L1/0025 ,  H04L1/0026 ,  H04L1/20 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/03343 ,  H04L25/067 ,  H04L27/2601 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Aspects of a method and system for predicting CQI values for ML detection in a 2×2 MIMO system are presented. In one aspect of the system, a CQI value for a MIMO communication system may be computed based on a computed channel realization by reverse mapping the computed channel realization to a corresponding CQI value. Based on the computed CQI value, a coding rate may be selected. The coding rate may be selected from a lookup table, wherein the computed CQI value is utilized as an index to the lookup table. The reverse mapping may utilize a function, which is computed using radial basis function networks. In another aspect of the system, a joint mutual information value may be computed for the MIMO communication system. The joint mutual information value may be computed based on a Shannon mutual information value and a matched filter mutual information value.

摘要翻译： 提出了一种用于在2×2 MIMO系统中预测ML检测的CQI值的方法和系统的方面。 在该系统的一个方面，可以基于所计算的信道实现，通过将计算的信道实现反向映射到相应的CQI值来计算MIMO通信系统的CQI值。 基于所计算的CQI值，可以选择编码率。 编码率可以从查找表中选择，其中所计算的CQI值被用作查找表的索引。 反向映射可以利用使用径向基函数网络来计算的函数。 在系统的另一方面，可以为MIMO通信系统计算联合互信息值。 可以基于香农互信息值和匹配滤波器互信息值来计算联合互信息值。

公开(公告)号：US08442142B2

公开(公告)日：2013-05-14

申请号：US12761567

申请日：2010-04-16

申请人： Eric Ojard ,  Sirikiat Ariyavisitakul ,  Joonsuk Kim

发明人： Eric Ojard ,  Sirikiat Ariyavisitakul ,  Joonsuk Kim

IPC分类号： H01Q3/00 ,  G01S1/00

CPC分类号： H01Q25/00

摘要： A method and system for beamforming signal transmission under a per-antenna power constraint is presented. In one aspect, a multiple input multiple output (MIMO) transmitting station may compute a per-antenna power gain factor for each of a plurality of transmit chain signals. The transmit chain signals may be concurrently transmitted by a plurality of transmitting antennas at the MIMO transmitting station. The plurality of transmit chain signals may correspond to beamforming signals, which are generated by performing spatial mapping on a plurality of space-time signals. The plurality of power gain factors may be computed based on a per-antenna power constraint. Alternatively, the plurality of power gain factors may be computed based on joint per-antenna power and total-power constraints. Each of the transmit chain signals may be amplified or attenuated based on the corresponding antenna gain factor. The amplified or attenuated signal is then transmitted by the corresponding transmitting antenna.

摘要翻译： 提出了一种在每个天线功率约束下波束成形信号传输的方法和系统。 在一个方面，多输入多输出（MIMO）发射站可以为多个发射链信号中的每一个计算每天线功率增益因子。 发射链信号可以在MIMO发射台处由多个发射天线同时发射。 多个发射链信号可以对应于通过在多个时空信号上执行空间映射而生成的波束形成信号。 可以基于每天线功率约束来计算多个功率增益因子。 或者，可以基于联合每天线功率和总功率约束来计算多个功率增益因子。 每个发射链信号可以基于相应的天线增益因子被放大或衰减。 放大或衰减的信号然后由相应的发射天线发射。