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I have a basic doubt i.e. What do we mean by a convex mixed integer non linear program?
Does it mean that the continuous relaxation of integer variables in MINLP results in a convex optimization problem
or
We have a Convex optimization problem for each feasible realization of the integer...
Hi
I am working on equal gain combining. In general, the fading channel is represented as h = r*exp(j*theta). The equal gain combiner multiplies the received copies at different antennas by exp(-j*theta), and then adds them all (addition of SNR at each branch).
You can see that for EGC we do...
How do I prove that a function of multiple variables e.g. f(x1,x2,x3,....,xn) is non decreasing. For single variable we prove that the first derivative is > 0, How do I do it for multiple variables? Check for non negativity of partial derivatives.
thanks
Hi
I used this forum earlier and there used to be a dedicated section for ebooks/solution manuals now there is no such section it gets so difficult to search for ebooks online and most of the links are already dead. Why is it so?
http://en.wikipedia.org/wiki/Phase-shift_keying#Offset_QPSK_.28OQPSK.29
see above basically you dont want a 180 degree phase shift which is possible in QPSK (e.g 11->00) but the number of bit transitions are also increased in O-QPSK though they are 90 degree transitions which is fine
Re: who can help me? how can I learn cooperative communicati
One confusion:
In cooperative setup this is is assumed that:
First the transmitter transmits and relay and the destination receives
Second only relay transmits
My question:
why next time only relay transmits, why not both the...
What is the meaning of a subchannel in GSM. For example for SDCCH we have 4 subchannels in combined mode does it mean that they are acually 4 diff pairs carrying diff signaling info for diff calls going on.
and also what does it mean "sub-channel number on this time-slot" ??
Re: VLR
vlr , visitor location register contains the database of roamng subscribers. Everytime there is a location update the data of the roaming subscriber from the old VLR is transerred to the new VLR corresponding to the new locationwhere the user moved in.
In which particual field are you interested in the physical layer or Mac layer.
I am more interested in the phy layer.
In physical layer there are many topics to deal with such as
Channel estimation
Equalization and interference mittigation,
PAPR,
Channel coding,
Channel modelling etc
Which...
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