Self-Organizing Hit Avoidance in Distributed Frequency Hopping Multiple Access Networks

Self-Organizing Distributed Sensor Networks

Advances in CMOS IC and micro electrical-mechanical systems (MEMS) technology are enabling construction of low-cost building blocks each of which incorporates sensing, signal processing, and wireless communications. Collections of these integrated microsensor nodes may be formed into sensor networks in a wide variety of ways, with characteristics that depend on the specific application – the to...

Distributed Localized Interference Avoidance for Dynamic Frequency Hopping ad hoc Networks

We present a cognitive spectrum access solution for FH-CDMA ad hoc networks. Building on a cluster-based split phase multi-channel MAC protocol, we propose a mechanism for local interference avoidance through distributed hopset adaptation. Its goal is to identify and substitute channels not suitable for reliable communication. Substitution rules replace channels by locally unused hopsets. This ...

Channel-Hopping Multiple Access

The medium-access control (MAC) protocols for wireless networks proposed or implemented to date based on collision-avoidance handshakes between sender and receiver either require carrier sensing or the assignment of unique codes to nodes to ensure that intended receivers hear data packets without interference from hidden sources. We present and analyze a protocol that we call channel-hopping mu...

Space-Time FSK for Slow Frequency-Hopping Multiple Access

Diversity Combining Considerations for Incoherent Frequency Hopping Multiple Access Systems

This paper studies the problem of diversity combining for frequency-hopped multiple access (FHMA) systems that operate in a mobile satellite environment characterized by frequency-nonselective Rician multipath fading. The modulation scheme considered is the incoherent 3f-ary frequency-shift keying (MFSK). The optimal diversity combining rule is derived under the assumptions that the number of a...