公开(公告)号：US5946351A

公开(公告)日：1999-08-31

申请号：US777335

申请日：1996-12-27

申请人： Sirikiat Ariyavisitakul ,  Nelson Ray Sollenberger

发明人： Sirikiat Ariyavisitakul ,  Nelson Ray Sollenberger

IPC分类号： H04L7/04 ,  H04L25/03 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L25/03057 ,  H04L7/04

摘要： A decision feedback equalizer receiver that assigns a number F of feedforward filter taps and optimizes digital receiver performance in multipath channel environments, where F is an integer less than a memory length of a radio channel. The feedforward filter taps are assigned to delay times corresponding to an optimum burst timing parameter delay time, d(0), and to F-1 time delays based on "tap SNR indices." For an Uncorrelated Inter-Symbol-Interference (UISI) case, the F-1 time delays are the first F-1 rank ordered time delays are selected as the feedforward tap delay times. For a general case, a combination of the UISI case and an analytical two cluster case is obtained by selecting the first F-2 rank ordered time delays and a 2D time delay, where D is the delay time corresponding to the largest estimated tap SNR index.

摘要翻译： 分配前馈滤波器抽头数量F的判决反馈均衡器接收器，并且在多径信道环境中优化数字接收器性能，其中F是小于无线电信道的存储器长度的整数。 前馈滤波器抽头被分配给对应于最佳突发定时参数延迟时间d（0）的延迟时间，并分配给基于“抽头SNR指数”的F-1时间延迟。 对于不相关的符号间干扰（UISI）情况，F-1时间延迟是第一个F-1等级有序时间延迟作为前馈抽头延迟时间。 对于一般情况，通过选择第一F-2秩有序时间延迟和2D时间延迟来获得UISI情况和分析两个群集情况的组合，其中D是对应于最大估计抽头SNR指数的延迟时间 。

公开(公告)号：US07933312B2

公开(公告)日：2011-04-26

申请号：US11769481

申请日：2007-06-27

申请人： Joonsuk Kim ,  Sirikiat Ariyavisitakul

发明人： Joonsuk Kim ,  Sirikiat Ariyavisitakul

IPC分类号： H04B1/00

CPC分类号： H04B7/0617 ,  H04B7/0634 ,  H04L1/0606 ,  H04L1/0643 ,  H04L5/0023 ,  H04L5/006 ,  H04L25/0204 ,  H04L25/03178 ,  H04L25/03343 ,  H04L25/03866 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Aspects of a method and system for reconfigurable SFBC/STBC in a diversity transmission system are presented. Exemplary aspects of the system may include one or more circuits that enable generation of a plurality of codeword sequences based on a data sequence. In a diversity transmission system, the plurality of codeword sequences may be concurrently transmitted via at least a portion of a plurality of transmitting antennas. The concurrently transmitted codeword sequences may enable a diversity receiver to generate the data sequence. In a single input single output transmission system, one or more circuits may enable transmission of one of the plurality of codeword sequences via one of the plurality of transmitting antennas. The transmitted codeword sequence may enable a receiver to generate the data sequence.

摘要翻译： 提出了一种分集传输系统中可重构SFBC / STBC的方法和系统。 系统的示例性方面可以包括能够基于数据序列生成多个码字序列的一个或多个电路。 在分集传输系统中，多个码字序列可以经由多个发射天线的至少一部分同时发射。 同时发送的码字序列可以使得分集接收机能够生成数据序列。 在单输入单输出传输系统中，一个或多个电路可以经由多个发射天线之一来实现多个码字序列之一的传输。 发送的码字序列可以使得接收机能够生成数据序列。

公开(公告)号：US20090268833A1

公开(公告)日：2009-10-29

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： H04L5/12 ,  H04L27/06

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2x2 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：US20090074114A1

公开(公告)日：2009-03-19

申请号：US12207721

申请日：2008-09-10

申请人： Eric Ojard ,  Sirikiat Ariyavisitakul

发明人： Eric Ojard ,  Sirikiat Ariyavisitakul

IPC分类号： H04L27/06

CPC分类号： H04L25/067 ,  H04L27/2647 ,  H04L2025/03375 ,  H04L2025/03426

摘要： Aspects of a method and system for approximate maximum likelihood (ML) detection in a multiple input multiple output (MIMO) receiver may comprise computing soft decision values for bits that may be decoded from a received signal vector by utilizing approximate ML detection. The soft decision values may be computed for at least a portion bits carried within a received signal vector by decomposing a candidate constellation vector into segments, with each dimension representing a spatial stream signal. After decomposition, soft decision values for at least a portion of the bits may be computed by selecting values in a search dimension and computing values in a plurality of slice dimensions. Values within the search dimension may be determined by selecting constellation points within a constellation map for the search dimension. Values within each slice dimension may be computed for each selected constellation point.

摘要翻译： 在多输入多输出（MIMO）接收机中用于近似最大似然（ML）检测的方法和系统的方面可以包括通过利用近似ML检测从可以从接收信号向量解码的比特计算软判决值。 可以通过将候选星座矢量分解为段来计算在接收信号向量内承载的至少一部分比特的软判决值，其中每个维度表示空间流信号。 在分解之后，可以通过选择搜索维度中的值和计算多个切片维度中的值来计算至少一部分比特的软判决值。 可以通过在搜索维度的星座图中选择星座点来确定搜索维度内的值。 可以为每个选定的星座点计算每个切片维数内的值。

公开(公告)号：US20080233965A1

公开(公告)日：2008-09-25

申请号：US11864638

申请日：2007-09-28

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： H04Q7/20

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

摘要： Aspects of a method and system for adaptive allocation of feedback resources for CQI and transmit pre-coding may include assigning 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. One or more feedback messages may be generated based at least on channel state information associated with the bandwidth and the feedback period assigned to the one or more CQI reporting units and with the bandwidth and the feedback period assigned to the one or more PMI reporting units. The bandwidth and the feedback period of the CQI reporting units and/or the PMI reporting units may be adjusted dynamically and/or adaptively. Based on the channel state information or as a function of a feedback rate, the bandwidth and/or the feedback period may be assigned.

摘要翻译： 用于CQI的反馈资源和发送预编码的自适应分配的方法和系统的方面可以包括将带宽和反馈周期分配给一个或多个CQI报告单元以及带宽和反馈周期到一个或多个PMI报告单元。 可以至少基于与分配给一个或多个CQI报告单元的带宽和反馈周期相关联的信道状态信息以及分配给一个或多个PMI报告单元的带宽和反馈周期来生成一个或多个反馈消息。 可以动态地和/或自适应地调整CQI报告单元和/或PMI报告单元的带宽和反馈周期。 基于信道状态信息或作为反馈速率的函数，可以分配带宽和/或反馈周期。

公开(公告)号：US4841547A

公开(公告)日：1989-06-20

申请号：US47319

申请日：1987-05-08

申请人： Fumio Ikegami ,  Susumu Yoshida ,  Tsutomu Takeuchi ,  Sirikiat Ariyavisitakul

发明人： Fumio Ikegami ,  Susumu Yoshida ,  Tsutomu Takeuchi ,  Sirikiat Ariyavisitakul

IPC分类号： H04L27/18 ,  H04L27/20 ,  H04L27/233

CPC分类号： H04L27/2085 ,  H04L27/2331

摘要： A digital communication system, in which digital information is represented by a quaternary information symbol (11, 01, 00, 10) and the double step phase shift, each step represented by (.pi./4, 3.pi./4, 5.pi./4, 7.pi./4), is performed per 1/2 time slot in correspondence to each information symbol, so that the number of phase shift per unit time in the case of the identical transmission rate can be decreased to 1/2, as compared with a .DELTA..theta./2-DSK system, and expansion of the bandwidth can be decreased to 1/2.

摘要翻译： 一种数字通信系统，其中数字信息由四元信息符号（11,01,00，10）和双步相移表示，每个步骤由（pi /4,3π/4,5π/ 4 ，7 pi / 4）对应于每个信息符号每1/2个时隙执行，使得在相同传输速率的情况下，每单位时间的相移数可以减少到1/2， 具有DELTAθ/ 2-DSK系统，并且带宽的扩展可以减少到1/2。

公开(公告)号：US08750089B2

公开(公告)日：2014-06-10

申请号：US12732975

申请日：2010-03-26

申请人： Sirikiat Ariyavisitakul ,  Jun Zheng

发明人： Sirikiat Ariyavisitakul ,  Jun Zheng

IPC分类号： H04J11/00 ,  H04L25/02 ,  H04L25/03 ,  H04L1/00

CPC分类号： H04L25/0204 ,  H04L1/005 ,  H04L5/0005 ,  H04L25/0206 ,  H04L25/024 ,  H04L25/0242 ,  H04L2025/03611 ,  H04W24/00 ,  H04W84/12

摘要： A method and system for iterative discrete Fourier transform (DFT) based channel estimation using minimum mean square error (MMSE) techniques are presented. Aspects of the method and system include a procedure for computing channel estimates in both the time domain and frequency domain (or mixed domain) using an iterative DFT method based on MMSE techniques. One aspect of the method and system may achieve low computational complexity and produce more accurate channel estimate values in low signal to noise ratio (SNR) regimes in comparison to conventional DFT-based channel estimation methods, which utilize least squares (LS) techniques. The method and system disclosed herein may be practiced in connection with a wide range of orthogonal frequency division multiplexing (OFDM) based systems, for example wireless local area networks (WLAN, for example IEEE 802.11 WLAN systems), and LTE systems.

摘要翻译： 提出了使用最小均方误差（MMSE）技术的基于迭代离散傅里叶变换（DFT）的信道估计的方法和系统。 该方法和系统的方面包括使用基于MMSE技术的迭代DFT方法计算时域和频域（或混合域）中的信道估计的过程。 与使用最小二乘（LS）技术的传统的基于DFT的信道估计方法相比，该方法和系统的一个方面可以实现低计算复杂度并且在低信噪比（SNR）方案中产生更准确的信道估计值。 本文公开的方法和系统可以结合宽范围的基于正交频分复用（OFDM）的系统，例如无线局域网（WLAN，例如IEEE 802.11 WLAN系统）和LTE系统来实施。

公开(公告)号：US08098755B2

公开(公告)日：2012-01-17

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： H04B7/02

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：US08086242B2

公开(公告)日：2011-12-27

申请号：US11864638

申请日：2007-09-28

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： H04W72/00

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

摘要： Aspects of a method and system for adaptive allocation of feedback resources for CQI and transmit pre-coding may include assigning 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. One or more feedback messages may be generated based at least on channel state information associated with the bandwidth and the feedback period assigned to the one or more CQI reporting units and with the bandwidth and the feedback period assigned to the one or more PMI reporting units. The bandwidth and the feedback period of the CQI reporting units and/or the PMI reporting units may be adjusted dynamically and/or adaptively. Based on the channel state information or as a function of a feedback rate, the bandwidth and/or the feedback period may be assigned.

摘要翻译： 用于CQI的反馈资源和发送预编码的自适应分配的方法和系统的方面可以包括将带宽和反馈周期分配给一个或多个CQI报告单元以及带宽和反馈周期到一个或多个PMI报告单元。 可以至少基于与分配给一个或多个CQI报告单元的带宽和反馈周期相关联的信道状态信息以及分配给一个或多个PMI报告单元的带宽和反馈周期来生成一个或多个反馈消息。 可以动态地和/或自适应地调整CQI报告单元和/或PMI报告单元的带宽和反馈周期。 基于信道状态信息或作为反馈速率的函数，可以分配带宽和/或反馈周期。

公开(公告)号：US20090190691A1

公开(公告)日：2009-07-30

申请号：US12246206

申请日：2008-10-06

申请人： Sirikiat Ariyavisitakul ,  Eric Ojard

发明人： Sirikiat Ariyavisitakul ,  Eric Ojard

IPC分类号： H04L27/00

CPC分类号： H04L25/03343 ,  H04B7/0434 ,  H04L25/0204

摘要： Aspects of a system for subspace beamforming for near capacity MIMO performance may include a MIMO transmitter that computes one or more rotation angle values (θf) based on a channel estimate matrix (H). In instances when each rotation angle is computed based on a Euclidean distance criterion, each value θf may also be computed based on a computed Euclidean distance. Alternatively, in instances when each rotation angle is computed based on a bit error rate (BER) criterion, each value θf may also be computed based on a signal noise power level (N0). A plurality of spatial stream signals (xi) may be generated utilizing one or more constellation types. The constellation map for each constellation type may be rotated based on a corresponding value θf. A plurality of transmit chain signals (txi) may be generated based on the signals xi and transmitted via a communication medium characterized by matrix H.

摘要翻译： 用于近容量MIMO性能的子空间波束形成系统的方面可以包括基于信道估计矩阵（H）来计算一个或多个旋转角度值（thetaf）的MIMO发射机。 在每个旋转角度基于欧氏距离标准计算的情况下，也可以基于计算的欧氏距离来计算每个值。 或者，在基于误码率（BER）准则来计算每个旋转角度的情况下，也可以基于信号噪声功率电平（N0）来计算每个值。 可以利用一个或多个星座类型来生成多个空间流信号（xi）。 每个星座类型的星座图可以基于相应的值totaf来旋转。 可以基于信号xi生成多个发送链信号（txi），并通过由矩阵H表征的通信介质发送。