摘要:
A method and system locates a position of a transceiver in a cooperative relay network of nodes. A primary node broadcasts a range request (RREQ) message. A target node, in response to receiving the RREQ message, broadcasts a range reply (RREP) message, wherein the RREP message includes a time difference between receiving the RREQ message and broadcasting the RREP message. A secondary node, in response to receiving the RREQ message and the RREP message, broadcasts a range data (RDAT) message, wherein the RDAT message includes a time difference between receiving the RREQ message and the RREP message. Then, a position solver can determine a location of the target node based on the time differences in the RREP message and the RDAT message.
摘要:
A method detects a target in a radar signal using space-time adaptive processing. A test statistic is T = max α max λ ∫ R f 1 ( x 0 , x 1 , … , x K ❘ α , λ , R ) p ( R ) ⅆ R max λ ∫ R f 0 ( x 0 , x 1 , … , x K ❘ λ , R ) p ( R ) ⅆ R , where x0 is a test signal, xk are K training signals, α is an unknown amplitude of a target signal within the test signal, λ is a scaling factor, R is a covariance matrix of the training signals, and a function max returns a maximum values. The test statistic is compared to a threshold to determine whether the target is present, or not.
摘要翻译:一种方法使用空时自适应处理来检测雷达信号中的目标。 一个检验统计量是T = maxα最大λ∫∫R f 1(x 0,x 1,...,x K |α,λ,R)p(R) ∫R f 0(x 0,x 1,...,x K |λ,R)p(R)ⅆR,其中x0是测试信号,xk是K个训练信号,α是 在测试信号内的目标信号的未知振幅,λ是比例因子,R是训练信号的协方差矩阵,函数max返回最大值。 将测试统计量与阈值进行比较,以确定目标是否存在。
摘要:
A method for facilitating an operation of an ad-hoc energy exchange network is disclosed. The network includes a set of nomadic charging stations (NCSs) and an energy consumer (EC). Upon receiving a request from the EC for an energy exchange, wherein the request includes a current location and a destination location of the EC, an exchange location for performing the energy exchange between a nomadic charging station (NCS) and the EC is determined based on the current location of the EC, the destination location of the EC, and a current location of the NCS. The exchange location is transmitted to the NCS and the EC.
摘要:
Embodiments of the invention disclose a method and a system configured to transfer energy wirelessly, comprising a source configured to transfer the energy wirelessly to a sink via a coupling of evanescent waves, wherein the source generates an electromagnetic (EM) near-field in response to receiving the energy; and an energy relay arranged such that to increase the coupling between the source and the sink, wherein the source, the sink, and the energy relay are electromagnetic and non-radiative structures.
摘要:
Embodiments of the invention disclose a system configured to exchange energy wirelessly. The system includes a structure configured to exchange the energy wirelessly via a coupling of evanescent waves, wherein the structure is electromagnetic (EM) and non-radiative, and wherein the structure generates an EM near-field in response to receiving the energy; and a negative index material (NIM) arranged within the EM near-field such that the coupling is enhanced.
摘要:
A transmitted reference ultra-wide band communication signal embodied in an electromagnetic wave and configured to communicate a data value includes a first frame having a first reference pulse and a first data pulse. The first reference pulse has a reference polarity and the first data pulse has a data polarity. The first reference pulse is separated from the first reference pulse by a delay time. The reference polarity is set based on a predetermined reference value and a first pseudo-random polarity code sequence, and the data polarity is set based on the data value and a second pseudo-random polarity code sequence. A receiver configured to receive the signal, a transmitter configured to transmit the signal, and a system of transmitters and receivers are also provided.
摘要:
A method for communicating in a network including a coordinator node and a set of leaf nodes transmits periodically, from the coordinator node to the set of leaf nodes, a beacon defining a superframe, wherein the supper frame includes an active period and an inactive period, and wherein the active period includes a first contention access period (CAP-1), a first contention free period (CFP-1), a first group acknowledgement (GACK-1), a second CFP-2, a second GACK-2, and a second CAP-2, and wherein each CFP includes a guaranteed time slot (GTS) assigned to each leaf node. Then, each leaf node transmits to the coordinator node only during the GTS assigned to the leaf node during each CFP.
摘要:
Narrow band interference in a received pulsed radio signal is removed by first shifting the narrow band interference to a lower frequency using a non-linear filter, and the passing the shifted signal through a high pass filter before detecting energy in the pulsed radio signal. The pulsed radio signal can be an ultra-wideband signal, and the non-linear filter can use a Teager-Kaiser energy operator.
摘要:
A method signals in an ultra-wide bandwidth network. A data symbol is generated. A set of reference pulses is transmitted for the data symbol. Each reference pulse is of a different type. One data pulse is also transmitted for each reference pulse. A type of each data pulse is identical to the type of the corresponding reference pulse.
摘要:
A method for estimation a time-of-arrival of a radio signal is provided. The signal is an ultra-wideband (UWB) signal. The method uses kurtosis of the received signal to estimate an energy threshold of the signal. The energy threshold can be used to determine a time-of-arrival of the signal.