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In order to reduce the occurrence of collisions, while maintaining distributed access, Carrier Sense is often used More precisely, senders are able to sense that the channel is busy if the sum of the noise and the signal from interfering transmissions are above a given power threshold, called the Receiver Sensitivity Threshold (RxThreshold) If the channel is busy, the MAC protocol can defer transmission The Channel State at a given node for a given point of time represents if the channel sensed at the node is busy or idle A single strong signal or multiple weak signals over the same channel may together add up to create a busy channel state In the presence of competition for accessing the medium from interfering senders, the Medium Access Control (MAC) protocol plays the role of moderating access to reduce collisions while maintaining concurrency and fairness.

If the <Self/> is an M3TR, then it should know this and the ways in which it differs from other M3TRs 7272 Harris PRC-117 The Harris PRC-117 is a family of HF radios The A and B models were hardware-de ned radios, while the F model has SDR personalities conforming to the SDR Forum s SCA Certain personalities of the F model are not available for export Using That Knowledge: The HF AACR should be able to exchange HF waveforms with a trusted PRC-117F with limited user tedium but trust appropriate to the military situation..

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Under an ideal scheduler, the amount of throughput between a sender receiver pair depends upon the number of active nodes (senders or receivers) that are interfering with the data transmission However, practical schedulers are rarely able to archive this ideal behavior The IEEE 80211 MAC protocol [19] is the de facto standard for Wireless LAN (WLAN) and MHWNs, and much of the existing research is based on this protocol IEEE 80211 uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) In contention-based protocols such as IEEE 80211, the channel state at the receiver is not known at the sender, which contributes to the well-known hidden and exposed terminal problems [20] To counter these effects, IEEE 802.

When I returned from the bathroom, I d been margin-called I felt and heard a thumping sound in my head Whump! I rubbed my forehead A beastly headache was forming in the back of my head, which was the section of my brain probably used for storing numbers, such as the amount of money I just lost..

11 uses an aggressive CSMA (low receiver sensitivity) to attempt to prevent far-away interfering sources from transmitting together (but potentially preventing noninterfering sources from transmitting; hidden terminal is reduced, but exposed terminal increased) Optionally, the standard allows the use of Collision Avoidance (CA), which consists of Request-to-Send (RTS)/Clear-to-Send (CTS) control packets, to attempt to reserve the medium After a successful RTS-CTS handshake, the actual DATA packet is sent The successful reception of DATA packet is acknowledged by an ACK packet As a result of these mechanisms, many, but not all, collisions are prevented Depending on the relative location of contending sources to each other, either they are able to effectively handshake using the MAC protocol or they continue to collide..

721 List the unique features of HF in terms of (a) unique service offered by the physical properties of HF propagation; (b) unique challenges in establishing reliable links and networks in this band; and (c) unique size, weight, and power of HF RF devices 722 Create and embed RXML tags for the following knowledge chunk using the ontological primitives of CRA<Self/>: (a) The length of a full cycle radio wave in these bands is 100 meters at 3 MHz and 10 meters at 30 MHz HF antennas resonate well across bandwidths that are less than 10% of the carrier frequency To cover a full HF band using such resonant elements requires ten or more such antennas These may be packaged into a single log-periodic antenna to access the entire HF band ef ciently and with about 6 dBi of gain.

The problem is complicated because multiple concurrent transmissions may occur and collectively result in a collision, when individually they do not. Similarly, the aggressive collision avoidance mechanisms can prevent some possible concurrent transmissions from proceeding even though they do not cause a collision. In summary, the MAC protocol and the relative locations of contending sources play an important role in how a set of nearby sources interact and the resulting quality of the link observed by each of them.

Loaded whip antennas between 10 and 30 ft long also access the entire HF band with less ef ciency and near 0 dBi of gain (b) Using the tags from (a), convert the following to Radio XML: An AACR needs to know the ef ciency and directional gain that can be expected of an antenna of a given nomenclature in order to predict the radio s distribution of energy in space (c) Write a computer program to associate power ef ciency and directional gain with names of antennas Evaluate MS Excel, Analytica, MS Access, Java, and C (C++ or C#) for this task, identifying the advantages and disadvantages of each 723 Consider Section 7221, Ionosphere Knowledge Chunk Write RXML so that an AACR that accesses HF, VHF, and UHF has the formal radio knowledge needed to achieve the performance of this knowledge chunk.

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