FFT-DMAC:a tone based DMAC protocol

摘要

This paper presents the flip-flop tone(FFT)DMAC protocol,a tone based MAC protocol using di-rectional antennas to solve the deafness problem,hidden terminal and exposed terminal problems simulta-neously.It uses two pairs of flip-flop tones .The first pair of tone is to send omni-directionally to reachevery neighboring node to announce the start and the end of communication,and therefore to alleviate thedeafness problem.The second pair of tone is to send directionally towards the sender.It is used to solvethe hidden terminal problem as well as the exposed terminal problem.Evaluation shows that FFT-DMACcan achieve better performance compared to the 802 .11 and ToneDMAC protocol.