Performance evaluation of mobile radio slotted ALOHA with smart antennas
نویسندگان
چکیده
We report an investigation into the effect of using smart antennas on the performance of the slotted ALOHA protocol with capture in a mobile communications environment with Rayleigh and Log-normal fading. Our results demonstrate that by using smart antennas, we can achieve higher performance in terms of capture probability and throughput when compared to a conventional antenna system using the slotted ALOHA protocol.
منابع مشابه
Assessment of Contention-Based Wireless Medium Access Using Realistic Smart Antennas
In this paper, we assess the performance of the slotted ALOHA protocol with capture in a mobile communications environment with Rayleigh and Log-normal fading when used with switched-beam smart antennas. We consider the configuration where one receiver is present at each base station and calculate the capture probability, its asymptotic value as the number of colliding packets tends to infinity...
متن کاملImperfect sector antenna diversity in slotted ALOHA mobile network
In a wireless network with path loss and fading channels, receiver capture is known to substantially enhance the performance of the slotted ALOHA random access protocol. The efficiency of narrowband slotted ALOHA radio networks can be enhanced further by using sector antennas, each receiving signals from a particular segment of the network area. This paper investigates the effect of realistic, ...
متن کاملDOA-ALOHA: Slotted ALOHA for Ad Hoc Networking Using Smart Antennas
This paper develops a novel slotted ALOHA protocol (Direction-Of-Arrival ALOHA) for use in ad hoc networks where nodes are equipped with smart antennas. The protocol relies on the ability of the antenna and DOA algorithms to identify the direction of the desired signal and the direction of the interferers to maximize SINR (Signal to Interference and Noise Ratio) at the receiver. The performance...
متن کاملA Comparison of Cdma, Tdma and Slotted Aloha Multiple Access Schemes in Cellular Mobile Radio Systems
The increasing demand for mobile radio services and the scarce bandwidth available suggest to devote considerable research eeorts to nd more eecient multiple access techniques in order to improve the system capacity. In this work we compare the system performance of three mobile radio systems: the well known TDMA system, which is the basis of the European GSM, the recent CDMA system (a standard...
متن کاملSmart antennas for combined DOA and joint channel estimation in time-slotted CDMA mobile radio systems with joint detection
In cellular mobile radio systems, the directional inhomogeneity of the mobile radio channel can be exploited by smart antennas to increase the spectral efficiency. In this paper, a novel smart antenna concept applying receiver antenna diversity at the uplink receiver is investigated for a time-slotted code-division multiple-access (CDMA) mobile radio air interface termed time-division CDMA (TD-...
متن کامل