In this paper, we consider a joint beam forming, power and channel allocation in a multi-user and multichannel underlay multiple input single output (MISO) cognitive radio network (CRN). In this system, primary users (PU’s) spectrum can be reused by the secondary user transmitters(SUTXs) to maximize the spectrum utilization while the intra-user interference is minimized by implementing bean for...

Existing channel allocation methods are usually implemented for voice oriented services where the aim is to reduce the call blocking and call dropping rate. In this paper, we will investigate channel allocation schemes appropriate for data oriented services in a Broadband Fixed Wireless Access network where the aim is to reduce interference and improve overall packet throughput. A Fixed Channel...

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 ...

This paper investigates the problem of dynamic multiuser subchannel allocation in the downlink of OFDM systems. The assumptions are that the channel model is quasi-static and that the base station has perfect channel information. In traditional TDMA or FDMA systems, resource allocation for each user is nonadaptively fixed, and the water-filling power spectrum is known to be optimal. Since the s...

We address the problem of resource allocation on the downlink of an OFDMA single-cell system under fairness constraints with limited channel state information (CSI). Target QoS corresponds to a minimum user data rate, a target bit-error rate and a maximum BER-outage probability. The channel model includes path-loss, shadowing, and fading. The only available CSI is the channel average gain of ea...

An algorithm for WDM channel allocation, based on the concept of Optimal Golomb Ruler (OGR), is proposed. This algorithm enhances system performance by locating an allocation set, where the degradation caused by the effects of interchannel interference and Four-Wave Mixing (FWM) is minimal. Two sets of simulation were performed on an 8x10Gbpschannel system (channel spacing of 50GHz for equally ...

We propose an efficient uplink MAC protocol for a variable spreading gain interference-limited WCDMA system. It can, with high spectral efficiency, support both real-time traffic like speech and video and also non-real-time data traffic based on packet transmission. The schemes for power allocation, scheduling, and transmission rate adaptation for non-real time data traffic schemes are designed...

Device-to-device (D2D) communications have gained great attentions due to the potential and numerous benefits for cellular networks. However,it also brings tremendous resource allocation challenges for the sake of the constraint of battery life. Up to now, there are limited works attempt to prolong the battery life by improving the energy efficiency (EE). In this paper, we study how to perform ...

We propose three new design algorithms for jointly optimizing source and channel codes. Our optimality criterion is to minimize the average end-to-end distortion. For a given channel SNR and transmission rate, our joint source and channel code designs achieve an optimal allocation of bits between the source and channel coders. Our three techniques include a sourceoptimized channel code, a chann...

This paper presents a dynamic resource allocation scheme for OFDMA-based wireless broadband networks. The problem of maximizing the total packet throughput subject to individual user’s outage probability constraint is formulated. The proposed algorithm assumes a finite buffer for the arrival packets and dynamically allocates the radio resource based on users’ channel characteristics, traffic pa...