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    • 33. 发明授权
    • Combined frequency-time domain power adaptation for CDMA communication systems
    • 用于CDMA通信系统的组合频域功率适配
    • US07483493B2
    • 2009-01-27
    • US11077435
    • 2005-03-10
    • Yeheskel Bar-NessYe Hoon Lee
    • Yeheskel Bar-NessYe Hoon Lee
    • H04L1/02
    • H04W52/42H04L27/2608
    • Practical transmission power adaptation in multicarrier code division multiple access (MC-CDMA) communications is using either a frequency domain technique or a time domain technique or a combined frequency and time domain technique in response to channel variations. With frequency domain power adaptation, the transmission power is allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers, where the strongest subcarriers are understood to exhibit the highest channel gains. A substantially optimal N′ can be chosen so that the average bit error rate (BER) is minimized. In the time domain power adaptation technique, transmission power is adapted so that the desired signal strength at the receiver output is maintained at a fixed level. In the combined time and frequency domain adaptation technique, the transmission power is first allocated over the N′ (1≦N′≦N) strongest subcarriers rather than over all possible N subcarriers and then it is adapted so that the desired signal strength at the receiver output is maintained at a fixed level.
    • 多载波码分多址(MC-CDMA)通信中的实际发射功率适配采用频域技术或时域技术,或者采用组合频域和时域技术来响应信道变化。 通过频域功率自适应,发射功率分配在N'(1 <= N'<= N)个最强子载波上,而不是在所有可能的N个子载波上分配,其中最强子载波被理解为呈现最高信道增益。 可以选择基本上最佳的N',使得平均误码率(BER)被最小化。 在时域功率自适应技术中,发射功率被适配成使得接收机输出端的期望信号强度保持在固定的水平。 在组合的时域和频域适应技术中,首先在N'(1 <= N'<= N)个最强子载波上分配发射功率,而不是在所有可能的N个子载波上分配发射功率,然后适配使得所需的信号强度 在接收机输出端保持固定的电平。
    • 35. 发明授权
    • STBC MIMO-OFDM peak-to-average power ratio reduction by cross-antenna rotation and inversion
    • 通过横向天线旋转和反演降低STBC MIMO-OFDM峰值与平均功率比
    • US07339884B2
    • 2008-03-04
    • US11013934
    • 2004-12-16
    • Yeheskel Bar-NessMizhou TanZoran Latinovic
    • Yeheskel Bar-NessMizhou TanZoran Latinovic
    • H04J11/00
    • H04L25/03866H04L1/0625H04L27/2614H04L27/3411
    • A signal scrambling method is provided for peak-to-average power ratio (PAPR) reduction of STBC MIMO-OFDM signals in a MIMO-OFDM system having Y transmit antenna. In general terms the OFDM sequence of symbols in said signal for each transmit antenna is divided into M sub-blocks of equal size and subclockwise rotation and inversions are performed across all transmit antennas to generate [2Y]M permuted sequence sets from the original OFDM sequence. Based on a predetermined criteria, there is then selected from the resulting sets of OFDM sequences the one with the best PAPR properties for transmission. The predetermined criteria preferably comprises identifying maximums for all [2Y]M sequence sets, by calculating the largest PAPR value of Y sequences in each set and selecting a set with the minimum maximum for transmission.
    • 提供信号加扰方法,用于具有Y发送天线的MIMO-OFDM系统中的STBC MIMO-OFDM信号的峰均功率比(PAPR)降低。 一般来说,用于每个发射天线的所述信号中的符号的OFDM序列被划分为相同大小的M个子块和亚时基旋转,并且在所有发射天线之间执行反转以产生[2Y] 来自原始OFDM序列的序列集。 基于预定标准,从所得到的OFDM序列组中选择具有最佳PAPR属性的传输序列。 预定标准优选地包括通过计算每组中的Y序列的最大PAPR值并选择具有最小传输最小值的集合来识别所有[2Y]个超级序列集的最大值。
    • 36. 发明申请
    • STBC MIMO-OFDM peak-to-average power ratio reduction by cross-antenna rotation and inversion
    • 通过横向天线旋转和反演降低STBC MIMO-OFDM峰值与平均功率比
    • US20060120268A1
    • 2006-06-08
    • US11013934
    • 2004-12-16
    • Yeheskel Bar-NessMizhou TanZoran Latinovic
    • Yeheskel Bar-NessMizhou TanZoran Latinovic
    • H04J11/00
    • H04L25/03866H04L1/0625H04L27/2614H04L27/3411
    • A signal scrambling method is provided for peak-to-average power ratio (PAPR) reduction of STBC MIMO-OFDM signals in a MIMO-OFDM system having Y transmit antenna. In general terms the OFDM sequence of symbols in said signal for each transmit antenna is divided into M sub-blocks of equal size and subclockwise rotation and inversions are performed across all transmit antennas to generate [2Y]M permuted sequence sets from the original OFDM sequence. Based on a predetermined criteria, there is then selected from the resulting sets of OFDM sequences the one with the best PAPR properties for transmission. The predetermined criteria preferably comprises identifying maximums for all [2Y]M sequence sets, by calculating the largest PAPR value of Y sequences in each set and selecting a set with the minimum maximum for transmission.
    • 提供信号加扰方法,用于具有Y发送天线的MIMO-OFDM系统中的STBC MIMO-OFDM信号的峰均功率比(PAPR)降低。 一般来说,用于每个发射天线的所述信号中的符号的OFDM序列被划分为相同大小的M个子块和亚时基旋转,并且在所有发射天线之间执行反转以产生[2Y] 来自原始OFDM序列的序列集。 基于预定标准,从所得到的OFDM序列组中选择具有最佳PAPR属性的传输序列。 预定标准优选地包括通过计算每组中的Y序列的最大PAPR值并选择具有最小传输最小值的集合来识别所有[2Y]个超级序列集的最大值。
    • 39. 发明授权
    • Frame synchronization using correlation between permuted sequences
    • 使用置换序列之间的相关的帧同步
    • US08126103B2
    • 2012-02-28
    • US12001463
    • 2007-12-11
    • Miao ShiYeheskel Bar-Ness
    • Miao ShiYeheskel Bar-Ness
    • H04L7/00
    • H04L7/041H04J11/0069H04J13/0059H04L27/2613H04L27/2656H04L27/2675
    • A permuted sequences combination uses a frame structure in which two sync words, each comprising M complex symbols, are appended at the frame start. One benefit is the reduction of the large variance of the timing estimation error in the conventional correlation method. In at least one embodiment, the first sync word, {right arrow over (s)}1, is a predetermined constant amplitude zero autocorrelation (CAZAC) sequence. The second sync word, {right arrow over (s)}2, is a permutation of the first such that the combination of the two received sync signal vectors perform sliding window processing where the peak occurs at the correct frame start. The permuted sequences combination can be used in both AWGN channel and multi-path environments.
    • 置换序列组合使用帧结构,其中在帧起始处附加两个包含M个复符号的同步字。 一个好处是在传统的相关方法中减少了时间估计误差的大变化。 在至少一个实施例中,第一同步字,{right arrow over(s)} 1是预定的恒定幅度零自相关(CAZAC)序列。 第二同步字{right arrow over(s)} 2是第一个的置换,使得两个接收的同步信号向量的组合执行滑动窗口处理,其中在正确的帧开始出现峰值。 排列顺序组合可用于AWGN通道和多路径环境。