Melsa et al. [1] presented a channel shortening technique for Discrete Multitone transceivers that reduces Intersymbol Interference (ISI) by forcing the effective channel’s impulse response to lie within a window of v+1 consecutive samples. Arslan et al. [2] claim that although this method is intuitive, no previous study has been made on its optimality. They comment on its optimality by simulat...

Relaying has been extensively studied during the last decades and has found numerous applications in wireless communications. The simplest relaying method, namely amplify and forward, has shown potential in MIMO multiple access systems, when Gaussian fading channels are assumed for both hops. However, in some cases ill conditioned channels may appear on the second hop. For example, this impairm...

Recently, a new multiple access (MA) scheme called block-interleaved frequency division multiple access (B-IFDMA) is under consideration as an MA scheme candidate for 4G wireless applications. In this paper, the two variants of B-IFDMA are considered, the jointDFT B-IFDMA and the added-signal B-IFDMA, and compared in terms of sensitivity to carrier frequency offsets (CFOs) for both uplink and d...

In this paper, we present a widely-linear (WL) distributed beamforming algorithm that takes full advantage of weak-sense second-order (SO) non-circular source signals. We consider a single-antenna source-destination pair in an ad-hoc relay network that suffers from strong interference. Assuming that perfect channel state information (CSI) is available at the receiver, we design our algorithm ba...

Abstract—Conventionally, interference and noise are treated as catastrophic elements in wireless communications. However, it has been shown recently that exploiting known interference constructively can even contribute to signal detection ability at the receiving end. This paper exploits this concept to design artificial noise (AN) beamformers constructive to the intended receiver (IR) yet keep...

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...

This paper considers the performance of four channel identi cation techniques for code division multiple access (CDMA) antenna array receivers. These techniques are based on the assumption that the interference is spatially white: they provide a spatial \matched lter" solution. Perturbation formulae are presented for estimating the attainable signal to interference and noise ratios (SINR) for t...

In recent years, attentions have been focused on 3D (three-dimensional) beamforming which can improve cell average and edge user throughput and eliminate the interference to adjacent cells. In the work towards calibration of 3D channel model, it seems that elevation beamforming with fixed electrical downtilt of 102 degrees has a good SINR (signal to interference and noise ratio) performance in ...

Both in the light of energy conservation and the expansion of existing networks, wireless networks face the challenge of nodes with heterogeneous transmission power. However, for more realistic models of wireless communication only few algorithmic results are known. In this paper we consider nodes with arbitrary power assignment in the so-called physical or SINR model. Our first result is a bou...

-Wireless communication systems are tending towards progressive data transfer over a long range of transmission. With the raise in required quality of services, the allocation of the available resource is to be maintained efficiently. A load matrix approach for multi cellular architecture is proposed, which allocate the communication power based on channel estimated SINR. The allocation of powe...