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    • 2. 发明申请
    • HEADER REPETITION IN PACKET-BASED OFDM SYSTEMS
    • 基于分组的OFDM系统中的总线重复
    • US20120170625A1
    • 2012-07-05
    • US13376856
    • 2010-08-20
    • Joon Bae KimMarcos C. Tzannes
    • Joon Bae KimMarcos C. Tzannes
    • H04B1/38
    • H04L27/2601H04B1/38H04L1/08H04L27/2613H04L69/22
    • An OFDM communication system is described that allows different values of D in a single domain where nodes are operating in different portions of frequency bands. For the power-line medium, G.9960 has defined two over-lapped baseband bandplans, 50 MHz-PB and 100 MHz-PB. In this exemplary scenario, the level of frequency diversity is different depending on the bandplan, hence providing different header decodibility if D is fixed to 1. If D is fixed to 2, then it increases reliability for the narrow-band devices, but may also unnecessarily increase overhead for the wide-band devices. An exemplary aspect is therefore directed to techniques to accommodate different repetitions schemes (D=1, . . . , DMAX and H=I, . . . , HMAX) in a single domain, and still allow devices to communicate with one another where DMAX and HMAX can be larger than 2.
    • 描述了OFDM通信系统,其允许在节点在频带的不同部分中操作的单个域中的D的不同值。 对于电力线路媒体,G.9960已经定义了两个超重的基带频带计划,50 MHz-PB和100 MHz-PB。 在该示例性场景中,根据频带规划,频率分集​​的电平是不同的,因此如果D固定为1,则提供不同的报头解码。如果D固定为2,则增加窄带设备的可靠性,但也可以 不必要地增加宽带设备的开销。 因此,示例性方面涉及在单个域中适应不同重复方案(D = 1,...,DMAX和H = I,...,HMAX)的技术,并且仍允许设备彼此通信,其中DMAX HMAX可以大于2。
    • 3. 发明申请
    • COMBINED DATA AND PROBE (CDP) FRAME
    • 组合数据和探测(CDP)帧
    • US20120189072A1
    • 2012-07-26
    • US13383872
    • 2010-07-19
    • Marcos C. TzannesJoon Bae Kim
    • Marcos C. TzannesJoon Bae Kim
    • H04L27/28
    • H04L27/2613H04L25/0226
    • A system or method in an OFDM communication environment includes transmitting, by a transmitter, and/or receiving, by a receiver, a frame that includes one or more preamble symbols, one or more header symbols, a plurality of data symbols, and a plurality of probe symbols. The probe symbols are predefined symbols that do not carry user data and are generated by modulating a predefined pseudo-random bit sequence (PRBS). A frame header, communicated in the one or more header symbols, includes one or more bit fields that indicate that the frame includes N probe symbols, wherein N is an integer greater than 1, and wherein the plurality of probe symbols are transmitted or received after the one or more header symbols and before the plurality of data symbols.
    • OFDM通信环境中的系统或方法包括由发射机发送和/或由接收机接收包括一个或多个前同步码符号的帧,一个或多个标题符号,多个数据符号和多个 的探头符号。 探测符号是不携带用户数据并通过调制预定义伪随机位序列(PRBS)生成的预定符号。 在一个或多个报头符号中通信的帧报头包括指示该帧包括N个探测符号的一个或多个比特字段,其中N是大于1的整数,并且其中多个探测符号在 一个或多个标题符号和多个数据符号之前。
    • 8. 发明申请
    • PACKET DETECTOR
    • 分组检测器
    • US20120275528A1
    • 2012-11-01
    • US13376400
    • 2010-07-22
    • Marcos TzannesJoon Bae KimStuart Sandberg
    • Marcos TzannesJoon Bae KimStuart Sandberg
    • H04L27/28
    • H04L27/2602H04L5/0044H04L7/042H04L25/03866H04L27/2613H04L27/2614H04L27/2647H04L27/3472H04L69/22
    • There are several exemplary ways to more efficiently communicate an out-of-domain seed to a receiver—in a first technique, the seed can be indicated in the header portion or data portion of a packet. For example, the header portion of the packet could contain one or more bit fields that indicate the value of the LFSR seed used for the preamble portion of the packet. The receiver would learn the out-of-domain seed after receiving a first out-of-domain packet and decoding the header portion of that packet. After learning the out-of-domain seed, the receiver could send a packet indicating the value of the out-of-domain seed to the local master. The local master could then transmit the value of the out- of-domain seed in the header portion or data portion of a local MAP frame.
    • 在第一技术中,有几种用于更有效地将域外种子传送到接收器的示例性方式,可以在分组的报头部分或数据部分中指示种子。 例如,分组的报头部分可以包含指示用于分组的前导码部分的LFSR种子的值的一个或多个比特字段。 接收器将在接收到第一个域外分组并解码该分组的报头部分之后学习域外种子。 在学习域外种子后,接收方可以向本地主机发送一个指示域外种子值的数据包。 然后,本地主机可以将外域种子的值发送到本地MAP帧的报头部分或数据部分。