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power constraint in cooperative communication.

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Blue_Angel

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cooperative communication

hello guys,
a lil thing is bugging me.

what do we mean by power constrained devices?
e.g we refer to mobiles in cellular comm to be power constrained devices. it means that they have limited power.
lets say a mobile user has to observe a power constraint of P. it sends each symbol with power P. what would be the power per symbol if it has to send its own symbols and some other user's symbols(cooperative communication)?
will still each symbol be sent with P or P/2????

any idea or reference appriciated.
 

mowgli

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cooperative communication power

Hello,

maybe the expression "power constrained devices" you found means that the mobile terminals are not allowed to transmit to the maximum available power level because of power control loop implemented in cellular systems, to avoid excessive multiple user interference level at base station side.

Regards
Mowgli
 

palai_santosh

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Power contrained devices - if you say in the context of mobile devices it means the limited battery power(i.e. the power required to run the device . which includes processing and communication if its a communication device).

If you are talking about power consumed for communication only that means between a basestation and a SS then they have to follow the power limits according to standard. If the they support collaborative power management then they can reduce the transmission power based on channel condition and bandwidth requirement.
 

saeddawoud

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Blue_Angel said:
hello guys,
a lil thing is bugging me.

what do we mean by power constrained devices?
e.g we refer to mobiles in cellular comm to be power constrained devices. it means that they have limited power.
lets say a mobile user has to observe a power constraint of P. it sends each symbol with power P. what would be the power per symbol if it has to send its own symbols and some other user's symbols(cooperative communication)?
will still each symbol be sent with P or P/2????

any idea or reference appriciated.

In the case of cooperative diversity, the transmitted power from S is reduced (not necessarily by one-half), where the remaining power is used by the relay. Of course this has the advantages of power and interference reduction at each node, as well as increased coverage.
 

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