Behrooz Razeghi

  • Citations Per Year
Learn More
We study and analyze coverage region in MIMO communication systems for a multiple-relay network with decodeand-forward (DF) strategy at the relays. Assuming that there is a line-of-sight (LOS) propagation environment for source-relay channels and channel state information is available at receivers (CSIR), we consider the objective of maximizing coverage(More)
In this paper, we propose a new relay selection scheme for multi-user cooperation communications using a novel multiple criteria decision making optimization method. We consider jointly three criteria in our proposed relay selection method, two of which have been studied and employed for the process of relay selection in the literature, jointly and(More)
In this paper, first we propose a new approach for mathematical multiple criteria decision making (MCDM) methods using information theoretic measures, entropy and divergence. Using the concept of entropy, we determine the impact of each criterion in decision making process. The Shannon's entropy has been previously employed for this purpose. In this paper(More)
In this paper we study and analyze coverage region for half-duplex multiple-input multiple-output (MIMO) relay channel with amplify-and-forward (AF) strategy at the relay station. By assuming mixed Rayleigh and Rician fading channels with two different relay station situations, we consider the objective of maximizing coverage region for a given transmission(More)
A new three stage low-noise, high-gain operational amplifier (Op-Amp) is proposed in this paper. Design strategies are discussed for minimizing noise and increasing gain. Multipath nested Miller compensation used for three stage operational amplifier. The circuit is designed in the 0.18μm CMOS technology. The HSPICE software was used for simulation.(More)
This paper demonstrates the design of low voltage, low power CMOS op-amp using DTMOS technique for low-power applications. The design goal is to achieve high gain, phase margin and minimum power dissipation at lower supply voltage. DTMOS transistor is proposed in this paper for the design of op-amp which replaces the normal CMOS transistors for designing a(More)
Some unique attributes of P2P networks such as cost efficiency and scalability, contributed for the widespread adaptation of these networks. Since P2P applications are mostly used in file-sharing, preserving anonymity of users has become a very important subject for researchers. As a result, a lot of methods are suggested for P2P networks to preserve(More)
In this paper a high performance CMOS operational amplifier (op amp) using dynamic threshold voltage MOSFET (DTMOS) technique is presented. A two stage operational amplifier is designed and simulated using 0.18 μm CMOS technology. The performed simulation results show an inputreferred noise of 490.82 nV/√Hz at 100 Hz, and a power consumption of 38.53 μW(More)
It is known that, as opposed to point-to-point channel, separate source and channel coding is not optimal in general for sending correlated sources over multiuser channels. In some works joint source-channel coding has been investigated for some certain multiuser channels, e.g., multiple access channel (MAC) and broadcast channel (BC). In this paper, we(More)