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11. 发明授权

US08411807B1 Mid-packet clear channel assessment 有权
标题翻译：中包清晰通道评估
公开(公告)号：US08411807B1
公开(公告)日：2013-04-02
申请号：US12202782
申请日：2008-09-02
申请人： Raghuram Rangarajan , Brian Donald Hart , Paul J. Stager
发明人： Raghuram Rangarajan , Brian Donald Hart , Paul J. Stager
IPC分类号： H03D1/00
CPC分类号： H04L69/22 , H04L1/08 , H04L7/08 , H04L27/2607 , H04L27/2647 , H04L27/2656 , H04L27/2671 , H04L27/2679
摘要： A mid-packet detection technique is provided that detects a packet with periodic repetitions of a fixed duration at a point in time of the packet other than a start-of-packet pattern, e.g., a preamble, associated with the packet. The process performs packet detection without detecting a preamble and does not require carrier frequency recovery, timing recovery (synchronization) or channel estimation. In one embodiment, a doubly differential matched filter autocorrelation of the received signal is computed and used as a metric for packet detection when the preamble is not observed or to complement preamble detection. The metric is compared to a threshold to indicate detection of a packet.
摘要翻译：提供了一种中间包检测技术，其检测分组的周期性重复，该分组在分组的时间点不同于与分组相关联的分组开始模式（例如，前导码）。该过程执行分组检测而不检测前导码，并且不需要载波频率恢复，定时恢复（同步）或信道估计。在一个实施例中，计算接收信号的双差分匹配滤波器自相关，并将其用作当没有观察到前同步码时的分组检测的度量或用于对前导码检测进行补码。将度量与阈值进行比较以指示分组的检测。

12. 发明申请

US20120291127A1 DISTINGUISHING BETWEEN BLUETOOTH VOICE AND DATA LINKS 有权
标题翻译：蓝牙声音和数据链接之间的差异
公开(公告)号：US20120291127A1
公开(公告)日：2012-11-15
申请号：US13342293
申请日：2012-01-03
申请人： Raghuram Rangarajan , David Kloper , Yohannes Tesfai
发明人： Raghuram Rangarajan , David Kloper , Yohannes Tesfai
IPC分类号： G06F21/20 , G06F11/10 , H03M13/09
CPC分类号： H04L1/0046 , H04L1/0072 , H04L1/0091
摘要： Techniques are provided for receiving a transmitted first packet that was formatted using a known scrambling algorithm with an unknown scrambling seed. An encoded packet payload is extracted from the first packet header. The encoded packet payload header is decoded to obtain a first scrambled packet payload header. For each potential value of the unknown seed, the first scrambled packet payload header is descrambled to produce a first set of descrambled packet payload headers and for each potential value of initial register values associated with a cyclic redundancy check, the cyclic redundancy check is executed comprising polynomial division on each of the descrambled packet payload headers such that when the polynomial division results in a zero remainder, a potential unscrambled payload header for the first packet is obtained. Information about the first packet is obtained from the potential unscrambled payload header.
摘要翻译：提供了用于接收使用具有未知加扰种子的已知加扰算法格式化的所发送的第一分组的技术。从第一分组报头中提取编码分组有效载荷。编码分组有效载荷头部被解码以获得第一加扰分组有效载荷头部。对于未知种子的每个潜在值，第一加扰分组有效载荷报头被解扰以产生第一组解扰分组有效载荷报头，并且对于与循环冗余校验相关联的初始寄存器值的每个潜在值，执行循环冗余校验，包括每个解扰分组有效载荷头部上的多项式除法使得当多项式除法导致零余数时，获得用于第一分组的潜在未加扰的有效负载报头。关于第一分组的信息是从潜在的未加扰的有效负载报头获得的。

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