We perform a new analysis of the performance of the wide-band code-division multiple access (W-CDMA) randomized slotted-offset random access channel with Nakagamifading and compare it with the performance of a comparable randomized slotted-ALOHA-based random access channel. In a previous paper, it was shown through simulations that the W-CDMA random access channel is fast, robust, and simple to...

This paper proposes a multiple access algorithm for broadband satellite communication networks. The access channel is the slotted Aloha contention channel. The performance of the algorithm is analyzed considering user terminal time uncertainty, power uncertainty, minimizing co-channel interference as well as non-perfect feedback information from the central receiver. It is shown that reliable a...

Carrier sense multiple access and its variants have been widely used in mobile ad hoc networks. However, most existing access mechanisms cannot guarantee quality for real-time traffic. This paper presents a distributed medium access control protocol that provides multiple priority levels for stations to compete for the wireless channel. One common channel is assumed to be shared by all stations...

This paper investigates the problem of distributed medium access control in a time slotted wireless multiple access network with an unknown finite number of homogeneous users. Assume that each user has a single transmission option. In each time slot, a user chooses either to idle or to transmit a packet. Under a general channel model, a distributed medium access control framework is proposed to...

It has been shown analytically [1],[2] that significant performance improvements as compared to existing technologies (e.g., IEEE 802.11) can be achieved in random access wireless networks. In [3] we proposed a fully distributed channel access paradigm based on the opportunistic communication principal called the Channel MAC paradigm suitable for distributed wireless networks such as ad hoc net...

Source and channel coding over multi-user channels in which receivers have access to correlated source side information, is considered. For several simple multi-user channels necessary and sufficient conditions are characterized for lossless transmission under certain source-channel structures. In particular, the multiple access channels, the compound multiple access channels and the interferen...

In this paper we provide an achievable rate region for the discrete memoryless multiple access channel with correlated state information known non-causally at the encoders using a random binning technique. This result is a generalization of the random binning technique used by Gel’fand and Pinsker for the problem with non-causal channel state information at the encoder in point to point communi...

A performance analysis of an access channel decoder is presented which exploits a diversity gain due to the independent magnitude of received signals energy at each of the antenna elements of a smart-antenna base-station transceiver subsystem (BTS) operating in CDMA2000 1X signal environment. The objective is to enhance the data retrieval at cellsite during the access period, for which the opti...

We present the Hybrid Activation Multiple Access scheduling protocol (HAMA) for wireless ad hoc networks. Unlike previous channel access scheduling protocols that activate either nodes or links only, HAMA is a node-activation oriented channel access scheduling protocol that also maximizes the chance of link activations. According to HAMA, the only required information for scheduling channel acc...

We consider the communication from a cooperative sensor network to a mobile access point. We assume that sensors are informed with a global message and some nodes are misinformed with random messages. Nodes transmit to the mobile access point in a pre-scheduled order. We derive an achievable rate for the information retrieval process when d sensors are transmitting at a time. For the Gaussian m...