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    • 2. 发明授权
    • Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
    • 基于OFDM的多天线通信系统的发射分集和空间扩展
    • US08520498B2
    • 2013-08-27
    • US13461707
    • 2012-05-01
    • Jay Rodney WaltonJohn Wendell KetchumMark S. WallaceSteven J. HowardSanjiv Nanda
    • Jay Rodney WaltonJohn Wendell KetchumMark S. WallaceSteven J. HowardSanjiv Nanda
    • H04J11/10
    • H04B7/0615H04B7/0413H04L27/2602
    • A multi-antenna transmitting entity transmits data to a single- or multi-antenna receiving entity using (1) a steered mode to direct the data transmission toward the receiving entity or (2) a pseudo-random transmit steering (PRTS) mode to randomize the effective channels observed by the data transmission across the subbands. For transmit diversity, the transmitting entity uses different pseudo-random steering vectors across the subbands but the same steering vector across a packet for each subband. The receiving entity does not need to have knowledge of the pseudo-random steering vectors or perform any special processing. For spatial spreading, the transmitting entity uses different pseudo-random steering vectors across the subbands and different steering vectors across the packet for each subband. Only the transmitting and receiving entities know the steering vectors used for data transmission. Other aspects, embodiments, and features are also claimed and disclosed.
    • 多天线发射实体使用(1)向接收实体指导数据传输的导向模式或(2)伪随机发射转向(PRTS)模式来将数据发送到单天线或多天线接收实体,以随机化 通过子带上的数据传输观察到的有效信道。 对于发射分集,发射实体在子带上使用不同的伪随机导引向量,但是在每个子带的分组上使用相同的导向向量。 接收实体不需要具有伪随机导引向量的知识或执行任何特殊处理。 对于空间扩展,发射实体在子带上使用不同的伪随机导引向量,并且跨每个子带的分组使用不同的导向矢量。 只有发送和接收实体知道用于数据传输的导向向量。 还要求和公开其他方面,实施例和特征。
    • 9. 发明授权
    • Spatial spreading in a multi-antenna communication system
    • 多天线通信系统中的空间扩展
    • US08204149B2
    • 2012-06-19
    • US11008865
    • 2004-12-09
    • Jay Rodney WaltonLizhong ZhengJohn W. KetchumMark S. WallaceSteven J. Howard
    • Jay Rodney WaltonLizhong ZhengJohn W. KetchumMark S. WallaceSteven J. Howard
    • H04L27/26H04B7/06
    • H04B7/0417H04B7/0456H04B7/0669H04B17/336H04L1/06
    • Spatial spreading is performed in a multi-antenna system to randomize an “effective” channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain ND data symbol blocks to be transmitted in NM transmission spans, where ND≧1 and NM>1. The ND blocks are partitioned into NM data symbol subblocks, one subblock for each transmission span. A steering matrix is selected (e.g., in a deterministic or pseudo-random manner from among a set of L steering matrices, where L>1) for each subblock. Each data symbol subblock is spatially processed with the steering matrix selected for that subblock to obtain transmit symbols, which are further processed and transmitted via NT transmit antennas in one transmission span. The ND data symbol blocks are thus spatially processed with NM steering matrices and observe an ensemble of channels.
    • 在多天线系统中执行空间扩展,以随机化接收实体针对每个发送的数据符号块观察到的“有效”信道。 对于MIMO系统,在发送实体处理(例如,编码,交织和调制)数据,以获得将以NM≥1和NM> 1的NM传输跨度发送的ND数据符号块。 ND块被划分为NM数据符号子块,每个传输跨度的一个子块。 对于每个子块,选择导向矩阵(例如,以确定性或伪随机方式从一组L个导引矩阵中,其中L> 1)。 每个数据符号子块用为该子块选择的导引矩阵进行空间处理,以获得在一个传输范围内经由NT个发射天线进一步处理和传输的发射符号。 因此,ND数据符号块用NM导引矩阵进行空间处理,并观察信道的集合。