The communication channel is a shared resource in networked control systems, and channel access at every instant cannot be guaranteed. In this paper, we propose a novel architecture for control over wireless networks with integrated medium access control (MAC). We evaluate the impact of constrained channel access on the cost of controlling a single plant over a network and establish that the se...

Channel access resistance has been measured to estimate the characteristic size of a single ion channel. We compare channel conductance in the presence of nonpenetrating water-soluble polymers with that obtained for polymer-free electrolyte solution. The contribution of the access resistance to the total alamethicin channel resistance is 10% for first three open channel levels. The open alameth...

In this work, we investigate a three-user cognitive communication network where a primary two-user multiple access channel suffers interference from a secondary point-to-point channel, sharing the same medium. While the point-to-point channel transmitter—transmitter 3—causes an interference at the primary multiple access channel receiver, we assume that the primary channel transmitters—transmit...

In this paper, a slotted ALOHA-based cognitive radio (CR) network is proposed and the throughput performance of the proposed CR network model under Rayleigh fading channels is examined. Our CR network contains two special groups of users, primary users (PUs) and CR users (CRUs), and they are considered to be sharing a timeslotted-based common communication channel. While PUs can access the chan...

In this paper, a comparative estimate of the channel capacity assigned to each user for frequencydivision multiple-access (FDMA) and direct-sequence code-division multiple-access (DS-CDMA) schemes operating in a Rayleigh fading channel is presented. Then, the achievable channel capacity per user (in the Shannon sense) is estimated in an average sense considering the inherent diversity potential...

The existing access scheme used in the Reverse Access Channel (R-ACH) in IS95A/B is based on a Slotted Aloha protocol. The mobile sends a probe and waits for an acknowledgement from the base station. If no acknowledgement is received, the mobile increases power and tries again. This type of access scheme requires a large probe power to guarantee detection and presents high delays. Data applicat...