Media access control for high-speed local area and metropolitan area communications networks

Article Abstract:

Local area networks (LANs) and private and public metropolitan area networks (MANs) need to use efficient methods to share resources. Medium access control (MAC) schemes, architectures, and protocols can be used to coordinate, control, and supervise how users access the shared communications media. There are four main MAC classes: fixed-assignment, random-access, demand-assignment/polling, and demand-assignment/reservation. The key channel timing formats in classifying, examining, and developing MAC protocols are unslotted channel, slotted channel, and hyper-slotted channel. There are three classes of access control policies: fixed assignment (FA), demand assignment (DA), and random access (RA). FA means a station is dedicated to a communications channel resource. DA has a signaling procedure which permits certain network entities to know about the transmission and networking needs and demands of the network stations. RA means stations vie for access according to an algorithm. These policies can be combined with MACs to control access to the shared communications medium.

Network management systems, Local area networks, LAN, Metropolitan area networks, Network Management, Resource Sharing, Network Access Procedures

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Interference rejection techniques in spread spectrum communications

Article Abstract:

Spread spectrum communication systems have many applications, and one of their major assets is their ability to withstand either intentional or unintentional interference. Techniques by which spread spectrum communication system performance can be enhanced under especially high levels of interference are presented. These techniques involve some type of additional signal processing, and two general types of narrow-band interference suppression schemes are emphasized: those based on least-mean square estimation techniques, and those based on transform domain processing structures.

Telecommunications, Functional Capabilities, Performance, Communications Technology, Systems, Methods

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