Hi Sunish

I have used the modules you talk about - albeit with a PIC.

I think there have been some helpful hints from Michael Karas about having a preamble and a CRC check on your data packet.

Now, if you happen to be using a plain IR remote controller IC and just change the IR led and the IR detector, you do not need to do anything else in most cases. This is how I happen to use the modules BTW. The modules are sold in Bombay by A-Plus at Santacruz.

But, on the contrary, if you are generating your own data stream and trying to decode it on the receiver, the hints by Michael definitely are the way to go.

I know this much from using the modules. The receiver is the one that picks up the ambient noise and you will need a good amount of RF shielding to significantly reduce this ambient pickup. The ASK method of modulation means that the receiver tracks the average signal strength and then differentiates the changes and puts it out as decoded signal. So, with no real transmission happening, the RSSI(receiver signal strength indication) is quite low (noise level) and it can pickup strays. When the real transmission happens, the RSSI is quite high (dBm) and a genuine signal is picked up. The CRC check will eliminate the possibilities of corrupted packets.

Hope this helps

Jerson