'Time diversity' presentation slideshows

15-441 Computer Networking

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3. Diversity

3. Diversity. Main story. Communication over a flat fading channel has poor performance due to significant probability that channel is in a deep fade . Reliability is increased by providing more resolvable signal paths that fade independently.

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3. Diversity

3. Diversity. Main story. Communication over a flat fading channel has poor performance due to significant probability that channel is in a deep fade . Reliability is increased by providing more resolvable signal paths that fade independently.

606 views • 39 slides

Wireless Communication Diversity

Wireless Communication Diversity. Sharif University of Technology. Fall 1395 Afshin Hemmatyar. Traditional transmission : Send at higher powers to those who have worse channels (Channel Inversion, similar to power control in CDMA).

1.25k views • 34 slides

Wireless Communication Diversity

Wireless Communication Diversity. Sharif University of Technology. Fall 2015 Afshin Hemmatyar. Traditional transmission : Send at higher powers to those who have worse channels (Channel Inversion, similar to power control in CDMA).

370 views • 34 slides

Lecture 9: Diversity

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Diversity

Diversity. Lecture 6. Announcement. Project proposals: due on Monday, May 06. Diversity. Fading hurts the reliability of the system (we saw 30dB possible power penalty). Reliability is increased by providing more signal paths that fade independently.

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Space Time Codes

Space Time Codes. Attenuation in Wireless Channels. Path loss: Signals attenuate due to distance Shadowing loss : absorption of radio waves by scattering structures Fading loss :constructive and destructive interference of multiple reflected radio wave paths

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Diversity

Diversity. Diversity ? primary goal is to reduce depth & duration of signal fades in flat fading channel Flat fading ? B s < B c ? no ISI from multipath ! Spatial diversity ? multiple Rx antennas (usually) Use multiple Rx antennas in mobile or base station

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Satellite Radio: The Next Communications Revolution?

Satellite Radio: The Next Communications Revolution?. David Bultman. Challenges In Satellite Radio . There are three general problems with satellite reception: Blockages Foliage Multipath Fading. Blockages. The target of satellite radio is a mobile platform

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On the Suitability of Repetition for 802.11ah

On the Suitability of Repetition for 802.11ah. Date: 2012-01-17. Authors:. Abstract. We present results on channel coherence times under low mobility. Our results suggest that repetition schemes may not be applicable under low mobility sensor applications. Motivation.

194 views • 8 slides