Gain division multiple access (GDMA) is a non-orthogonal (NOMA) technique for uplink communications. In GDMA, the receiver employs both magnitudes and phases of channel gains associated to users separate users. power-domain NOMA, power levels users.We apply GDMA concept together with orthogonal frequency (OFDM) combat collision problem in ALOHA system. Our goal minimize complexity devices (user...

Here we continue the analytic study of packet switching in radio channels which we reported upon in our two previous papers [ 11, [2]. Again we consider a population of terminals communicating with a central station over a packet-switched radio channel. The allocation of bandwidth among the contending terminals can befixed [e.g., time-division multiple access (TDMA) or frequency-division multip...

In this paper, a protocol is proposed in high data rate Ultra Wide Band (UWB) network to enhance the network performance and increase its capacity. This enhancement comes from the using Wise Algorithm for Link Admission Control (WALAC). Comparisons between proposed protocol, Slotted Aloha and Packet Reservation Multiple Access (PRMA) are done. The proposed protocol shows better results in both ...

This paper attempts to measure the performance of the Hyper Text Transfer Protocol (HTTP) (Fielding et al. 1997) in a multiple access, satellite environment. The HTTP client’s access to the Internet is via a shared satellite uplink channel. The multiple access protocols we have chosen to simulate are Slotted ALOHA (Kleinrock and Lam 1975) and Reservation ALOHA (Crowther et al. 1973). We have co...

An Adaptive Reservation Time Division Multiple Access (AR-TDMA) control protocol for Wireless Asynchronous Transfer Mode (WATM) networks is proposed in this paper. AR-TDMA combines the advantages of distributed access and centralised control for transporting Constant Bit Rate (CBR), Variable Bit Rate (VBR) and Available Bit Rate (ABR) traffic efficiently over a wireless channel. The contention ...

A new multichannel MAC protocol called Hop Reservation Multiple Access (HRMA) for packet-radio networks is introduced, specified and analyzed. HRMA is based on very-slow frequencyhopping spread spectrum (FHSS) and takes advantage of the time slotting necessary for frequency hopping. HRMA allows a pair of communicating nodes to reserve a frequency hop (channel) using a hop reservation and handsh...

Recently, random access protocols have acquired a new wave of interest, not only from the satellite communication community, but also from researchers active in fields like Internet of Things and machine-to-machine. Asynchronous (slotand frame-wise) ALOHA-like random access protocols, are very attractive for such applications, enabling low complexity transmitters and avoiding time synchronizati...

Intra-body communication (IBC) is a type of Body Area Network (BAN)that utilizes human body as the medium for data transmission. Thelow power requirements of intra-body communication (IBC) as compared to near field electromagnetic waves showed that it can be a suitable solution for Medical Body AreaNetworks (MBANs) in a mobile health care system.In this paper, we investigate the transmission ch...

In TDMA-based MAC (media access control) protocols for satellite network access, slotted ALOHA which has been widely deployed in Very Small Aperture Terminal (VSAT) systems. More recently, Generalized Retransmission Announcement Protocol (GRAP) was proposed in [5], which regroups the immediate access by contention at low loads and the reservation access at higher loads to achieve a better effic...