3 research outputs found
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Avoiding Interference from Hidden Terminals with Carrier Tones
A new approach to collision avoidance is described that is based on the use of carrier tones sent over a single control channel. A carrier tone can indicate that the sender is busy transmitting a request-to-send (RTS), the receiver is busy receiving a data packet, or the receiver is sending an acknowledgment (ACK). RTS, data packets, and end of transmission (ET) packets are sent over the primary data channel without using carrier sensing. The throughout of the resulting protocol, which we call Carrier-Tone Multiple Access (CTMA), is compared with the throughput of CSMA with collision avoidance (CSMA/CA) protocol and the dual busy-tone multiple access (DBTMA) protocol. The results of the analysis show that CTMA is a more efficient channel-access scheme than the other two approaches
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Design and Analysis of  CSMA/CAD
Carrier-Sense Multiple Access with Collision Avoid- ance and Detection (CSMA/CAD) is introduced and analyzed. The new protocol operates in a single channel and consists of taking advantage of self-interference cancellation to enable collision detection (CD) in the context of collision-avoidance (CA) handshakes in multi-hop wireless networks. It is shown that CSMA/CAD eliminates the collisions of data packets in the presence of hidden terminals. The throughput of CSMA/CAD is analyzed and compared with the throughput of CSMA, CSMA/CA, and dual busy-tone multiple access (DBTMA). The analysis results show that CSMA/CAD provides better perfor- mance than the other channel-access schemes aimed at combating hidden terminals, and that the throughput degradation due to hidden terminals in CSMA/CAD is limited compared to CSMA