This paper investigates energy efficient power allocation scheme for OFDM-based cognitive opportunistic relaying links (CORL), where secondary users (SUs) may incorrectly sense the unlicensed spectrum and hence transmit data in collision. We aim to maximize the energy efficiency (EE) by optimal and low complexity power allocation design. At first, an energy efficient power allocation optimizati...

Massive multiple-input multiple-output (MIMO) is still valid as an important system to increase performance of fifth generation (5G) and beyond wireless communication technologies. Spectrum efficiency (SE), high data rate energy (EE) are among these performances. Recently, due the in interconnected devices, spread internet things (IoT) systems limited resources, various improvements have become...

Multiuser orthogonal frequency division multiplexing (MU-OFDM) is a promising technique for achieving high downlink capacities in future cellular systems. A key issue in MU-OFDM is the allocation of the OFDM subcarriers and power among users sharing the channel. Previous allocation algorithms cannot ensure fairness in advance. In this paper, a proportional rate adaptive resource allocation meth...

Balls are sequentially allocated into n bins as follows: for each ball, an independent, uniformly random bin is generated. An overseer may then choose to either allocate the ball this bin, or else a new independent bin. The goal of reduce load most heavily loaded after ?(n) balls have been allocated. We provide asymptotically optimal strategy yielding maximum (1+o(1)) 8logn loglogn balls.

Next generations of mobile telecommunication have to provide not only the voice or message services but also a wide set of new applications coming from the Internet world. Because of fading wireless channel and limited bandwidth, the problem of resource and power allocation has become of prime importance for stability and effectiveness of future mobile communication systems. In this paper we st...