Not enough info.
What is the source of the data and what is to receive the data?
How far do you need to send this?
What is the frequency of the data?
Is this wireless or wired?
basically i m doing PCM transmitter....the concept is like this...i wanna transmitt data for example 1010 for moving left, 1001 for moving forward and etc. this data need to transmit to my pic microcontroller that control my rc helicopter motor. the microcontroller work by varying its duty cycle thus its vary its speed which enables rc helicopter to fly and move left and right. It should be wireless and regarding the distance it can 300m to 1km