U ltra B and Remote Specially appointed Systems.


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Be that as it may, it is not proposed to supplant the above innovations, but rather exist together with ... Move tremendous documents between computerized cameras, camcorders, and PCs. ...
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Slide 1

Ioannis Broustis, Srikanth Krishnamurthy Mart Molle WHYNET - UCLA, November 2004 U ltra B and Wireless Ad Hoc Networks

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Motivation Current remote arrangements (IEEE 802.11, Bluetooth… ) face numerous issues: Limited channel limit High power utilization UWB is an amazing answer for short-extend correspondences. Be that as it may, it is not proposed to supplant the above advances, but rather exist together with them. 170+ organizations have as of now hopped on the UWB wagon

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Why UWB? Preferences: Low-control operation. Ease. Low likelihood of recognition and low likelihood of sticking capacities. Low obstruction levels to existing administrations. Capacity to enter dividers, and so on. Accessibility of exact area data.

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UWB: What is it? Accessible data transmission FCC designates 7,500 MHz in the 3.1 to 10.6 GHz band. Any sign that: Occupies no less than 500MHz of BW, or More than 25% of an inside recurrence:

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UWB Applications Stream DVD substance to HDTVs at the same time. Remotely synchronize apparatus timekeepers. Interface high-information rate peripherals. Move tremendous records between advanced cameras, camcorders, and PCs. Military applications (radars, infiltrate dividers..)

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PHY: Single-Band and Multi-Band Single-Band Implementation One heartbeat possesses the entire BW at once. Multi-Band Implementation The 7.5GHz are separated into numerous groups. Data is autonomously encoded in the diverse groups. The lower furthest reaches of 500MHz, and in addition the transmission power limitations, must be kept up. Different potential outcomes OFDM, MC-CDMA (for future).

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Why lean toward Multi-Band ? The deferral spread of the remote channel, unless battled, confines the achievable rate. Versatile band determination  Avoids impedance Low unpredictability  Small handset cost Simultaneous transmissions in the diverse groups

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T f T c Time Hopping Time Hopping has been for the most part proposed as such, to lighten beat crashes. Heartbeats are transmitted by Time Hopping Sequence (THS) The THS is known by both the transmitter and the collector Receiver-based: The recipient\'s THS is taken after Transmitter-based: The transmitter\'s THS is taken after THS1: 0, 3, 2, 6 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 THS2: 4, 6, 3, 3

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Our present MAC plan Advantages Increased channel limit No requirement for Time Hopping All the multi-band points of interest, examined prior, over a potential single-band execution Ad hoc interchanges are empowered

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T c outline Multi-band Single-band Pulse width time Our present MAC plan Increased channel limit Each band is equipped for accomplishing the same limit as that of a solitary band framework, because of the postponement spread impact No requirement for Time Hopping A band is solely committed to a couple of hubs Pulses are currently being transmitted successively

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Data 7 recurrence Data 6 Data 5 Data 4 Data 3 Data 2 Control 1 Control 0 time Superframe Availability outline Superframe Our present MAC plan k 2 k 3 k 4 k 5 k 6 k 7

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Preliminary results Simulations Average throughput of right bits

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Preliminary results Simulations Frequency of crashes

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Preliminary results Simulations Average deferral for asset inhabitance

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Future Work MAC Layer Dealing with the costly preface time frame with UWB. Enhancing dispute determination. Exploring the likelihood of utilizing OFDM/MC-CDMA. Combination with better coding plans. Higher Layer Artifacts How does the MAC layer fit in with the directing layer? Transport layer criticism.

Slide 16

Questions? (References accessible upon solicitation) General Atomics Multi-Band Transceiver Prototype

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