نتایج جستجو برای: power transmission control

تعداد نتایج: 1937358  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند 1388

a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...

2003
Jilei Liu Baochun Li

Topology control with per-node transmission power adjustment in wireless sensor networks has been shown to be effective with respect to prolonging network lifetime via power conservation and increasing network capacity via better spatial bandwidth reuse. In this work, we consider the problem of topology control in a network of heterogeneous wireless devices with different maximum transmission r...

Journal: :CoRR 2016
Masoumeh Sadeghi Homa Nikbakht Amir Masoud Rabiei Vahid Shah-Mansouri

A cooperative medium access control (CoopMAC) network with randomly distributed helpers is considered. We introduce a new helper selection scheme which maximizes the average throughput while maintaining a low power consumption profile in the network. To this end, all transmissions are assumed to be performed using power control. We assume that each node can estimate the channel between itself a...

Journal: :EURASIP J. Wireless Comm. and Networking 2015
Woon Kim Zeeshan Kaleem KyungHi Chang

In a 3rd Generation Partnership Project Long Term Evolution-Advanced (3GPP LTE-A) uplink, user equipment (UE) has a maximum transmission power limit defined by the UE power class. Generally, the cell edge UE has a higher probability to be constrained by the maximum transmission power level owing to the compensation of the large pathloss. When the UE transmission power is constrained by the maxi...

2003
Kwonhue Choi Sooyoung Kim

Kwonhue Choi et al. 437 We derive a new joint power and rate control rule with which we can minimize the mean transmission delay in CDMA networks for a given mean transmission power. We show that it is optimal to respectively control the power inverse-linearly and the rate linearly to the square root of channel gain while maintaining the signal-to-interference ratio at a constant. We also show ...

Journal: :Wireless Communications and Mobile Computing 2009
Guoliang Xing Mo Sha Gregory Hackmann Kevin Klues Octav Chipara Chenyang Lu

Many wireless sensor networks must sustain long lifetimes on limited energy resources. Two major approaches, transmission power control and sleep scheduling, have been proposed to reduce the radio power consumption in the transmission state and the idle state, respectively. In this paper, we first review existing transmission power control and sleep scheduling approaches and then describe a Uni...

2012
Kodukula Sowmya Indranil Saaki

–Low frequency electromechanical oscillations are inevitable characteristics of power systems and they greatly affect the transmission line transfer capability and power system stability. Traditionally, power system stabilizers (PSS) are being used to damp these oscillations. Unified Power Flow Controller (UPFC) is a well-known FACTS device that can control power flow in transmission lines. It ...

2013
Vaibhav S Kale Prashant R Patil Ravi Khatri

— The Unified Power Flow Controller (UPFC) is a typical FACTS (Flexible AC Transmission Systems) device that is the most sophisticated and complex power electronic equipment and has emerged for the control and optimization of power flow and also to regulate the voltage in electrical power transmission system. This project propose the real, reactive power and voltage control through a transmissi...

2015
Chun-Hung Liu

In this thesis, we introduce two distinct approaches – distance-aware scheduling and 2layer discrete power control (DPC), which are able to enhance the transmission capacity of a large-scale wireless ad hoc network. Transmission capacity is an area spectrum efficiency metric of a wireless ad hoc network with an outage constraint. The motivation of studying these two approaches is to investigate...

Journal: :international journal of automotive engineering 0
biglarian keshavarz mazidi najafi

many studies have been done on hybrid vehicles in the past few years. the full hybrid vehicles need a large number of batteries creating up to 300 (v) to meet the required voltage of electric motor. the size and weight of the batteries cause some problems. this research investigates the mild hybrid vehicle. this vehicle includes a small electric motor and a high power internal combustion engine...

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