公开(公告)号：US20170353293A1

公开(公告)日：2017-12-07

申请号：US15539001

申请日：2014-12-24

Applicant: INSTITUT MINES-TELECOM ,  MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Venkat Chandar ,  Aslan Tchamkerten

IPC: H04L7/04 ,  G06F17/15 ,  H04B1/7075 ,  H04L12/26

CPC classification number: H04L7/042 ,  G06F17/15 ,  G06F17/18 ,  H04B1/70752 ,  H04L43/024

Abstract: A method of detecting transient changes in the distribution of a discrete time series includes: operating in a sparse mode wherein, at sniff periods successively repeated at a first rate, at most K test phases are performed, K being an integer superior or equal to two, each test phase consisting of analyzing, by a sampling stopping time determination unit, samples of the time series captured by a sampler at sampling times according to a second rate which is higher than the first rate to provide a positive or negative result of the test phase. If the results of K successive test phases of a sniff period are each positive, the method switches to operate in a dense mode wherein the sampler is operated to continuously capture samples of the time series at sampling times according to the second sampling rate.

公开(公告)号：US12238766B2

公开(公告)日：2025-02-25

申请号：US17787301

申请日：2020-12-11

Applicant: INSTITUT MINES TELECOM

Inventor： Manuj Mukherjee ,  Aslan Tchamkerten ,  Chadi Jabbour

IPC: H04W74/08 ,  H04W74/0808

Abstract: A channel sensing device for detecting preamble transmission by observing a channel sensing sequence of a length smaller than or equal to a maximum given length, the channel sensing device being implemented in a receiver, the channel sensing sequence includes one or more samples. The channel sensing device is configured to: receive input parameters comprising a target reliability metric, a receiver noise profile, the maximum given length, a received power, and a probability of there being a preamble; determine channel sensing parameters given the input parameters and according to the inimization of the average energy consumption per given length, the channel sensing parameters comprising a number of channel sensing phases, and a number of samples, a receiver power consumption value, and a preamble detection threshold corresponding to each of the channel sensing phases; perform a first channel sensing phase comprising: observing a batch of samples of the one or more samples by consuming the receiver power consumption value corresponding to the first phase channel sensing phase; applying a hypothesis test comprising the comparison of a value derived from the observed samples with the preamble detection threshold corresponding to the first channel sensing phase; deciding on the presence of a preamble or on performing a subsequent channel sensing phase based on the comparison and/or whether the number of channel sensing phases is greater than one; a subsequent channel sensing phase comprising: observing a batch of samples by consuming the receiver power consumption value corresponding to the channel sensing phase; applying a hypothesis test comprising the comparison of a value derived from all of the so far observed samples with the preamble detection threshold; deciding on the presence of a preamble or on performing a subsequent channel sensing phase based on the comparison and/or on a condition related to a number of performed channel sensing phases compared with the number of channel sensing phases.

公开(公告)号：US10116434B2

公开(公告)日：2018-10-30

申请号：US15539001

申请日：2014-12-24

Applicant: INSTITUT MINES-TELECOM ,  MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Venkat Chandar ,  Aslan Tchamkerten

IPC: H04L27/06 ,  H04L7/04 ,  H04L12/26 ,  H04B1/7075 ,  G06F17/15

Abstract: A method of detecting transient changes in the distribution of a discrete time series includes: operating in a sparse mode wherein, at sniff periods successively repeated at a first rate, at most K test phases are performed, K being an integer superior or equal to two, each test phase consisting of analyzing, by a sampling stopping time determination unit, samples of the time series captured by a sampler at sampling times according to a second rate which is higher than the first rate to provide a positive or negative result of the test phase. If the results of K successive test phases of a sniff period are each positive, the method switches to operate in a dense mode wherein the sampler is operated to continuously capture samples of the time series at sampling times according to the second sampling rate.