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- 14th November 2016, 14:38 #1

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## power required of broadcast transmission

Hi all,

I want to know the power required by node i to**broadcast**its data to**2 nodes**is it the sum of power ofrequired for each node separetly ??

- 14th November 2016, 14:38

- 19th November 2016, 20:13 #2

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## Re: power required of broadcast transmission

No. If the antenna is omnidirectional, then ideally the power per unit area at a given distance in any direction is the same.

- 19th November 2016, 20:13

- 19th November 2016, 21:27 #3

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- 19th November 2016, 21:27

- 19th November 2016, 21:40 #4

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## Re: power required of broadcast transmission

What David83 is saying is an omnidirectional source produces a spherical radiation pattern. The strength decreases as the distance increases but the signal is there at all locations at all times. How much of it you receive is a proportional to the distance the to receiver location but one receiver does not influence what another picks up.

Brian.PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.

It's better to share your questions and answers on Edaboard so we can all benefit from each others experiences.

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- 20th November 2016, 09:42 #5

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## Re: power required of broadcast transmission

What David83 is saying is an omnidirectional source produces a spherical radiation pattern. The strength decreases as the distance increases but the signal is there at all locations at all times. How much of it you receive is a proportional to the distance the to receiver location but one receiver does not influence what another picks up..

If the emission is confined to a circular plane, the signal strength decreases as the inverse of the distance: the signal will be half as weak at twice the distance.

If the emission is confined to a parallel beam (pencil), the signal strength is independent of the distance.

Of course these are idealizations and are far from reality. You will mostly find that the signal always decreases as the inverse square of the distance (even if the beam has been focussed, it still has some divergence). That is where the directional pattern of the particular antenna comes in the picture.

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- 20th November 2016, 09:42

- 20th November 2016, 17:28 #6

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## Re: power required of broadcast transmission

I said (ideally) the power at

is the same. What power a node receives doesn't affect the power the other node receives. A node receives a power that's proportional to its distance from the transmitter. It doesn't matter how many nodes there are as receivers.__any given distance__in any directionLast edited by David83; 20th November 2016 at 17:36.

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- 2nd December 2016, 15:40 #7

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## Re: power required of broadcast transmission

But I talk about the transmit power of node i to node j which is proportional to the distance of transmission. In the equation (1) of this paper http://people.rennes.inria.fr/Olivie...2007/NBS07.pdf is the transmit power of the source to a destination D which distant d ,when we have a destination D1 distant d1 from the source, the transmit power is simply we remplace d by d1 .But when the source broadcast to D and D1 what is the transmit power ??

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