Being a multicarrier modulation scheme, Orthogonal Frequency Division Multiplexing (OFDM) systems generally produce transmit signals with high Peak to Average Power Ratio or PAPR. Amongst numerous PAPR reduction strategies found in the literature, a relatively new but promising technique is the null and data subcarrier switching method. In this paper, we propose a new approach of null-data subc...

Orthogonal Frequency Division Multiplexing is a promising technology for high data rate transmission in wideband wireless systems for achieving high downlink capabilities in the future cellular systems. To minimize the overall transmit power, the genetic algorithm approach was proposed for adaptive subcarrier and bit allocation based on channel state information. This is done by assigning one s...

MIMO communication using multiple transmit and multiple receive antennas is a prominent solution to reduce the effect of fading. Additionally spatial multiplexing has been adopted in MIMO to increase the data rate without increasing the transmit power. Due to easier implementation of higher data rate by increased subcarriers and its inherent fading resistance using frequency diversity, MC-CDMA ...

We propose an iterative receiver for a multi-carrier (MC) code division multiple access (CDMA) system in the uplink for users moving at vehicular speed. MC-CDMA is based on orthogonal frequency division multiplexing (OFDM), thus time-variant channel estimation can be performed for every subcarrier independently. The variation of a subcarrier over the duration of a data block is upper bounded by...

Orthogonal frequency division multiplexing (OFDM) multihop system is a promising way to increase capacity and coverage. In this paper, we propose an optimally joint subcarrier matching and power allocation scheme to further maximize the total channel capacity with the constrained total system power. First, the problem is formulated as a mixed binary integer programming problem, which is prohibi...

We propose a subband spreading technique to average a frequency selective fading channel which produces different signal-to-noise ratios (SNR) per subcarrier in orthogonal frequency division multiplexing (OFDM) systems. Data symbols are spread over a subband using orthogonal codes and transmitted. Each subband is composed of a group of subcarriers. Received symbols in a subband have the same re...

In this paper we present a novel technique for resource allocation in Multiuser Orthogonal Frequency Division Multiplexing (MU-OFDM) Systems with proportional rate constraint. The subcarrier allocation is tackled using a novel algorithm which combines the aspects of both deterministic and genetic algorithms (GA). For the calculated subcarrier allocation, bit-loading is done using the standard W...

The massive deployment of 5G and beyond will require high capacity low latency connectivity services, so network operators have either to overprovision in their transport networks or upgrade the optical controllers make decisions nearly real time; both solutions entail capital operational expenditures. A different approach could be move decision making toward nodes subsystems, they can adapt dy...

We propose a multi-wavelength local-access optical network that is capable of supporting multiple services with diverse requirements. Integral to the network is an acousto-optic tunable filter which can select multiple non-adjacent wavelengths simultaneously. The use of multi-wavelength selectivity, together with subcarrier multiplexing in the electronic domain, results in simple solutions t o ...