How to make my system automatic ?

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truebs

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Hello friends ,
i've designed a system which in short is :
A tx and a rx ,the rx sends binary data to tx,when i press a button at rx end (i.e like remote control ).

Now i want that my circuit should send data automatically to tx,if it is in the range of the tx.
How can i do it ?

point to consider is:-
1. signal from tx are quite low in power.

Any suggestions ,links, methods, would be encouraged and thanked !

Thanks !
 

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