Multi-rank beamforming precoding apparatus and method
    11.
    发明授权
    Multi-rank beamforming precoding apparatus and method 有权
    多级波束成形预编码装置及方法

    公开(公告)号:US07949318B2

    公开(公告)日:2011-05-24

    申请号:US12026120

    申请日:2008-02-05

    IPC分类号: H04B1/04

    摘要: A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.

    摘要翻译: 相应地确定其中估计下行链路信道并由MRBF发射机使用的最佳预编码矩阵的多级波束成形(MRBF)方案。 从具有递归结构的矩阵码本中选择最佳预编码矩阵,其允许有效计算最佳预编码矩阵和对应的信号与干扰和噪声比(SINR)。 该码本还具有小的存储空间。 由于计算效率和适度的存储器要求,可以在用户设备(UE)进行最佳预编码确定,并通过有限的上行链路信道传送到发射基站,以通过下行链路信道实现。

    Method for uplink multiuser OFM with constrained inputs
    12.
    发明授权
    Method for uplink multiuser OFM with constrained inputs 有权
    具有约束输入的上行链路多用户OFM的方法

    公开(公告)号:US07843802B2

    公开(公告)日:2010-11-30

    申请号:US11950037

    申请日:2007-12-04

    IPC分类号: H04J11/00 H04J3/16 H04L27/36

    摘要: A method setting a maximum number of determinations for computing power allocation responsive to allocating power among multiple users in one subchannel of an OFDM system; beginning determination of maximum sum-throughput of users in the OFDM system with a randomly generated power profile with an iteration including: i) computing a sum-throughput using a power profile; ii) keeping a previous power profile if the sum-throughput of the current power profile sum-throughput is less than the previous power profile sum-throughput; iii) finding an index of power profile that has maximum sum-throughput; and ascertaining power profiles when the iteration is complete.

    摘要翻译: 响应于在OFDM系统的一个子信道中的多个用户之间分配功率而设置用于计算功率分配的最大数量的确定的方法; 开始确定具有迭代的随机生成的功率分布的OFDM系统中的用户的最大和吞吐量,包括:i)使用功率分布计算和吞吐量; ii)如果当前功率曲线和吞吐量的和吞吐量小于先前的功率曲线和吞吐量,则保持先前的功率曲线; iii)找到具有最大和吞吐量的功率曲线的索引; 并在迭代完成时确定功率曲线。

    Peak-to-average power ratio reduction with threshold limited selection for coded OFDM systems
    13.
    发明授权
    Peak-to-average power ratio reduction with threshold limited selection for coded OFDM systems 有权
    峰值与平均功率比降低与编码OFDM系统的阈值限制选择

    公开(公告)号:US07660360B2

    公开(公告)日:2010-02-09

    申请号:US11536263

    申请日:2006-09-28

    IPC分类号: H04K1/10 H04L27/28

    摘要: Disclosed is a coded orthogonal frequency-division multiplexing (OFDM) system and method for reducing a peak-to-average power ratio (PAPR). The system and method include a modulator configured to modulate (e.g., using quadrature amplitude modulation (QAM)) coded bits into symbols. The system and method also include an inverse discrete fourier transform (IDFT) module to perform an IDFT on the symbols to produce an OFDM signal. The system and method measure the PAPR of the OFDM signal and transmit the signal to a receiver if the PAPR of the signal is less than a threshold PAPR.

    摘要翻译: 公开了用于降低峰均功率比(PAPR)的编码正交频分复用(OFDM)系统和方法。 该系统和方法包括配置成将(例如,使用正交幅度调制(QAM))编码比特调制成符号的调制器。 该系统和方法还包括对码元执行IDFT以产生OFDM信号的反离散傅里叶变换(IDFT)模块。 如果信号的PAPR小于阈值PAPR,则该系统和方法测量OFDM信号的PAPR并将该信号发送到接收机。

    MULTI-RANK BEAMFORMING PRECODING APPARATUS AND METHOD
    14.
    发明申请
    MULTI-RANK BEAMFORMING PRECODING APPARATUS AND METHOD 有权
    多级波束形成预处理装置和方法

    公开(公告)号:US20080188190A1

    公开(公告)日:2008-08-07

    申请号:US12026120

    申请日:2008-02-05

    IPC分类号: H04B1/04

    摘要: A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.

    摘要翻译: 相应地确定其中估计下行链路信道并由MRBF发射机使用的最佳预编码矩阵的多级波束成形(MRBF)方案。 从具有递归结构的矩阵码本中选择最佳预编码矩阵,其允许有效计算最佳预编码矩阵和对应的信号与干扰和噪声比(SINR)。 该码本还具有小的存储空间。 由于计算效率和适度的存储器要求,可以在用户设备(UE)进行最佳预编码确定,并通过有限的上行链路信道传送到发射基站,以通过下行链路信道实现。

    Method and apparatus for optimization of wireless mesh networks
    15.
    发明申请
    Method and apparatus for optimization of wireless mesh networks 有权
    无线网状网络优化的方法和装置

    公开(公告)号:US20080130521A1

    公开(公告)日:2008-06-05

    申请号:US11999226

    申请日:2007-12-04

    IPC分类号: H04L12/28 H04Q7/00

    CPC分类号: H04W16/225 H04W28/16

    摘要: A cross-layer optimization framework for designing of multi-radio/multi-channel wireless mesh networks with network coding to support multiple unicast applications is used. A column-generation-based primal-dual method is used to solve the optimization problem. For network-layer formation, a code construction scheme based on linear programming is used. Delay constraints are imposed on the network code construction so the possible impact of the extra decoding delay to the upper-layer Transmission Control Protocol/Internet Protocol (TCP/IP) performance may be reduced without changing the upper-layer protocols.

    摘要翻译: 使用用于设计具有网络编码以支持多个单播应用的多无线电/多信道无线网状网络的跨层优化框架。 使用基于列生成的原始双重方法来解决优化问题。 对于网络层的形成,使用基于线性规划的代码构造方案。 对网络代码构造施加延迟约束,可以减少额外解码延迟对上层传输控制协议/因特网协议(TCP / IP)性能的可能影响,而不改变上层协议。

    Enhanced Successive Interference Cancellation (SIC) Receiver for Multiple-Input Multiple-Output (MIMO) Systems
    17.
    发明申请
    Enhanced Successive Interference Cancellation (SIC) Receiver for Multiple-Input Multiple-Output (MIMO) Systems 有权
    用于多输入多输出(MIMO)系统的增强型连续干扰消除(SIC)接收机

    公开(公告)号:US20080069262A1

    公开(公告)日:2008-03-20

    申请号:US11857273

    申请日:2007-09-18

    IPC分类号: H04B7/02

    摘要: A method includes the steps of: i) listing out all possibilities for first symbol of a two stream signal; ii) determining a second symbol of the two stream signal for each said first symbol listed out, iii) evaluating a metric for each said first symbol and second symbol pair, iv) determining the exact maximum log likelihood ratio for all bits associated with said first symbol using said metrics, v) decoding a codeword-1 using the maximum log likelihood ratios, vi) re-encoding said codeword-1, vii) modulating said re-encoded codeword-1, viii) subtracting said modulated re-encoded codeword-1 from said two stream signal, ix) determining metrics for all possibilities for second symbol in the signal obtained in viii, x) determining the maximum log likelihood ratios for all bits associated with second symbol, and xi) decoding said codeword-2 using the maximum log likelihood ratios for all bits associated with said second symbol.

    摘要翻译: 一种方法包括以下步骤:i)列出双流信号的第一符号的所有可能性; ii)为列出的每个所述第一符号确定两个流信号的第二符号,iii)评估每个所述第一符号和第二符号对的度量,iv)确定与所述第一符号和第二符号对相关联的所有位的精确最大对数似然比 符号,使用所述度量,v)使用最大对数似然比对码字-1进行解码,vi)重新编码所述码字1,vii)调制所述重新编码的码字1,viii)减去所述调制的重新编码的码字 - 1)从所述两个流信号中ix确定在viii中获得的信号中的第二符号的所有可能性的度量,x)确定与第二符号相关联的所有位的最大对数似然比,以及xi)使用 与所述第二符号相关联的所有位的最大对数似然比。

    Interpolation Based QR Decomposition for MIMO-OFDM Systems Using D-SMC Demodulator with Per Chunk Ordering
    18.
    发明申请
    Interpolation Based QR Decomposition for MIMO-OFDM Systems Using D-SMC Demodulator with Per Chunk Ordering 有权
    使用D-SMC解调器与每个块排序的MIMO-OFDM系统的内插QR分解

    公开(公告)号:US20080069261A1

    公开(公告)日:2008-03-20

    申请号:US11857251

    申请日:2007-09-18

    IPC分类号: H04L1/02

    摘要: In accordance with the invention, a method includes determining either the number of tones per chunk required to compute per-chunk order responsive to a sub-band bandwidth, a coherence bandwidth and number of chunks, or the number of chunks responsive to a sub-band bandwidth and a coherence bandwidth; determining an order for each chunk; and determining, for each chunk, QR decompositions for all its tones according to the determined order.

    摘要翻译: 根据本发明,一种方法包括:响应于子带带宽,相干带宽和块数量,或响应于子带宽的块的数量来确定每个块所需的每个块所需的每个块的个数, 带宽和相干带宽; 确定每个块的顺序; 并且根据确定的顺序为每个块确定其所有音调的QR分解。

    Scheduling method with tunable throughput maximization and fairness guarantees in resource allocation
    19.
    发明授权
    Scheduling method with tunable throughput maximization and fairness guarantees in resource allocation 有权
    调度方法具有可调吞吐量最大化和公平性保证资源分配

    公开(公告)号:US07230991B2

    公开(公告)日:2007-06-12

    申请号:US10731962

    申请日:2003-12-10

    IPC分类号: H04K1/10 H04L27/28

    CPC分类号: H04W72/1231 H04W72/04

    摘要: A flexible scheduling method with tunable throughput maximization and fairness guarantees in resource allocation is required and suitable for high-rate packet data and other services. Our inventive method, named Alpha-Rule, employs a control variable α, that permits dynamic and/or real-time adjustment/tradeoff between aggregate throughput, per-user throughput, and per-user resource allocation. Our method advantageously operates in conjunction with Multiple-Input Multiple-Output techniques such as Space-Time Block Coding (STBC), Bell Labs Layered Space-Time (BLAST) and others, while offering greater flexibility than existing scheduling techniques, e.g., max-C/I or Proportionally Fair (PF).

    摘要翻译: 需要具有可调吞吐量最大化和资源分配中公平性保证的灵活调度方法,适用于高速率分组数据和其他业务。 我们的创造性方法,称为Alpha规则,采用控制变量α,允许在聚合吞吐量,每用户吞吐量和每用户资源分配之间进行动态和/或实时调整/权衡。 我们的方法有利地与诸如空时块编码(STBC),贝尔实验室分层时空(BLAST)等的多输入多输出技术相结合,同时提供比现有调度技术更大的灵活性,例如max- C / I或比例公平(PF)。