A method for design and implementation of a compact via-less Composite Right/Left-Handed Transmission Line (CRLH TL) is presented. By introducing a new circuit model, the CRLH transmission line behavior is studied versus the parameters variations to achieve the desired characteristic impedance and electrical length. Then a compact quarter wavelength CRLH transmission line with 70 Ω characte...

The acoustic effect significantly increases the timing jitter of solitons and the bit-error rates in communication lines. We suggest the transmission of information with fixed-length blocks that contain an equal number of ones and zeros to suppress acoustically induced timing jitter. It is shown theoretically that this approach will significantly enhance the performance of systems with bit rate...

Abstract— The demand for high speed data services have been increasing day by day, a very promising approach is to use Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM). In this paper adaptive bit loading is applied to MIMO-OFDM, to obtain a bit and power allocation for each subcarrier assuming instantaneous channel knowledge. Relying on the available partial...

In this work we address the rate adaptation problem of a cognitive radio (CR) link in time-variant fading channels. Every time the primary users (PU) liberate the channel, the secondary user (SU) selects a transmission rate (from a finite number of available rates) and begins the transmission of fixed sized packets until a licensed user reclaims the channel back. After each transmission episode...

Real-time transmission of high-quality JPEG images is constrained by time, bandwidth, and transmission power in portable devices. To alleviate this problem, we designed, implemented, and evaluated a strategy that can adapt to different compression and transmission rates. (1) It gives important parts of an image higher priorities over unimportant parts. Therefore, the high-priority parts can ach...

This paper evaluates the effect of feedback transmission error on the performance of fixed-step and variable-step power control algorithms on the uplink of code division multiple access (CDMA) systems. The control mechanism is closed loop in that the algorithms are based on the feedback information of signal-tointerference ratio (SIR) measurement at the basestation. Under ideal conditions, vari...

We develop a model of monetary policy implementation in which banks bid for liquidity provided by the central bank fixed rate auctions, considering injections and extractions as well impact subsequent interbank market. derive equilibrium demands banks. also investigate auction has on market find that while lending is reduced, interest rates are moving desired direction. In context network, depe...

In this paper, an Integrated Radio Resource Allocation (IRRA) framework is proposed for enhanced uplink UTRA-FDD with fixed relay stations (FRSs). It comprises two entities: Relaying Link Scheduler (RLS), and Transmission Mode Aware Packet Scheduler (TMAPS). RLS is responsible for the scheduling of user transmission modes (direct or relaying) and routes, whereas TMAPS is responsible for the sch...

A Kalman-filter method for power control is proposed for broadband, packet-switched TDMA wireless networks. By exploiting the temporal correlation of co-channel interference, a Kalman filter is used to predict future interference power. Based on the predicted interference and estimated path gain between the transmitter and receiver, transmission power is determined to achieve a desired signal-t...

A Kalman-filter method for power control is proposed for broadband, packet-switched TDMA wireless networks. By exploiting the temporal correlation of co-channel interference, a Kalman filter is used to predict future interference power. Based on the predicted interference and estimated path gain between the transmitter and receiver, transmission power is determined to achieve a desired signal-t...