In this paper subcarrier and power allocation to each user at base-station maximize the user data rates, subject to constraints on total power and bit error rate. First, each sub-channel is assigned to the user with best channel-to-noise ratio for the channel, with random power distributed by water filling algorithm. The proposed genetic search helps fast convergence and can handle large alloca...

In this paper we developed a sub-optimal algorithm for joint routing and power allocation for an amplify-andforward multi-hop relay network. The objective function for the optimization is the received signal-to-noise ratio (SNR) at the destination. Higher SNR would cause for lower bit error rate consequently. The joint problem of power allocation and relay selection is formulated with respect t...

Abstract—In this paper we investigate filtered multitone modulation (FMT) for broadband multiuser powerline communications. FMT generalizes the popular OFDM scheme through the deployment of sub-channel shaping filters. We address the implementation problem, and we derive a novel efficient digital implementation of both the synthesis filterbank and the analysis filterbank assuming to multiplex t...

The financial system of the United States contains two large subsystems. The function of the first, generally referred to as monetary policy, is to control the total volume of credit for the purpose of aggregate economic stabilization. The second sub-system, which has no name, consists of a maze of regulations, institutions and tax practices designed to influence the allocation of credit, and h...

This paper presents a general framework for combined source-channel coding within the context of subband coding. The unequal importance of sub-bands in reconstruction of the source is exploited by an appropriate allocation of source and channel coding rates for the coding and transmission of subbands over a noisy channel. For each subband, the source coding rate as well as the level of protecti...

We show that the gain for using a waterfilling power allocation instead of a flat allocation over non-singular channel components is negligible at high signal-to-noise ratios. Consider the standard additive noise communication channel with a quadratic power constraint. Although waterfilling provides the optimal input distribution for Gaussian noise channels, sub-optimal distributions are often ...

The Multi-Carrier Code Division Multiple Access (MC-CDMA) is becoming a very significant downlink multiple access technique for high-rate data transmission in the fourth generation wireless communication systems. By means of efficient resource allocation higher data rate i.e. throughput can be achieved. This paper evaluates the performance of group (subchannel) allocation criteria employed in d...

In this paper performance evaluation of non contiguous spectrum allocation technique i. e. adaptive sub channel grouping scheme (ASG) is carried out. In ASG technique non contiguous frequency bands forms groups for MC-CDMA systems in downlink transmission. In this scheme channels are allocated to the users according to the CSI obtained and number of channels allocated to one user forms one grou...

The rapid proliferation of wireless systems makes interference management more and more important. This paper presents a novel cognitive coexistence framework, which enables an infrastructure system to reduce interference to ad-hoc or peerto-peer communication links in close proximity. Motivated by the superior resources of the infrastructure system, we study how its centralized resource alloca...

In this paper we consider MIMO system with Mt transmitting and Mr receiving antennas, when channel state information (CSI) is known on the transmitter side. The Reyleigh fading channel propagation condition is assumed. In this case, the optimum transmission consists of allocating the transmitted power for each virtual sub-channel related to the corresponding eigenvalue of the channel matrix. Th...