Hi Eric, Sorry, there seems to be some confusion! Let me phrase my question properly:
I want to implement a deceptive jammer. Details of the deceptive jammer are as follows: Deceptive jammer: Instead of sending out random bits, the deceptive jammer constantly injects regular packets to the channel without any gap between sub-sequent packet transmissions. As a result, a normal communicator will be deceived into believing there is a legitimate packet and will be duped to remain in the receive state. For example, in TinyOS, if a preamble is detected, a node remains in the receive mode, regardless of whether that node has a packet to send or not. Hence, even if a node has packets to send, it cannot switch to the send state because a constant stream of incoming packets will be detected. Further, we also observe that it is adequate for the jammer to only send a continuous stream of preamble bits (0xAA in TinyOS) rather than entire packets. I read this in a paper and am curious just like you that how some one can just send a preamble. Thanks, Kartik --- On Sun, 4/25/10, Eric Decker <[email protected]> wrote: From: Eric Decker <[email protected]> Subject: Re: [Tinyos-help] how to ensure to send only the preamble and not the message To: "Kartik Siddhabathula" <[email protected]> Cc: "TinyoS help" <[email protected]> Date: Sunday, April 25, 2010, 6:52 PM why on earth do you want to do that? Also what preamble are you talking about? The preamble on the radio? the cc2420 preamble? If so you can't do that. My understanding is the radio will start to transmit the preamble if it has something to transmit and after it has done the CCA, clear channel assessment. In other words if there is nothing to transmit it won't transmit the preamble. Catch 22. But maybe you are trying to do something else. In which case, phrasing your question in a more consise, clearer manner would really help you get an answer for the question you are seeking answers to. So what exactly are you trying to do? On Sun, Apr 25, 2010 at 2:46 PM, Kartik Siddhabathula <[email protected]> wrote: Hi All, I am using tinyos-2.x and telosb motes. I just want to send the preamble and not the complete message. Does anyone has any idea how I can do it? Thanks in advance, Kartik _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help -- Eric B. Decker Senior (over 50 :-) Researcher
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