Multiuser Orthogonal frequency division multiplexing (MU-OFDM) is one of the promising techniques for future cellular and wireless networks for achieving high downlink capacities. The objective of the next generation cellular and wireless networks, which are based on (MU-OFDM) is to increase the network efficiency by maximizing the total throughput of the system and minimizing the overall trans...

The visual cryptography scheme (VCS) is a scheme which encodes a secret image into several shares, and only qualified sets of shares can recover the secret image visually, other sets of shares cannot get any information about the content of the secret image. From the point of view of encrypting (carrying) the secret information, the traditional VCS is not an efficient method. The amount of the ...

For the problem to maximize spectral efficiency of OFDMA-TDD systems while satisfying bandwidth demands and the average bit error rate (BER) constraints of users, a resource allocation algorithm based on bandwidth demands of users is proposed. The user weights are introduced and the Max weighted-SNR scheduling strategy based on bandwidth demands of users is proposed. Based on this strategy,the ...

| In a multichannel context, the problem of blind estimation of the channel can be parameterized either by the channel impulse response or by the noisefree multivariate prediction error lter and the rst vector coe cient of the vector channel. The noise subspace, spanned by a set of vectors that are orthogonal to the signal subspace, can be parameterized according to different linear parameteriz...

In this paper, we present an intelligent physical layer for cognitive mesh networks. It is well recognized that wireless mesh networks suffer from the inherent property of per hop delay attributed to store and forward routing and channel contention. We show that an intelligent physical layer coupled with efficient traffic engineering and channel allocation mechanism will reduce latency. In this...

We consider a heterogeneous network with mobile edge computing, where a user can offload its computation to one among multiple servers. In particular, we minimize the system-wide computation overhead by jointly optimizing the individual computation decisions, transmit power of the users, and computation resource at the servers. The crux of the problem lies in the combinatorial nature of multi-u...

Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation system. The transmission channel is divided into a number of subchannel in which each subchannel is assigned a subcarrier. Conventional OFDM systems use IFFT and FFT algorithms at the transmitter and receiver respectively to multiplex the signals and transmit them simultaneously over a number of subcarriers. The syst...

We study the problem of inter cell interference coordination (ICIC) with fixed transmit power in OFDMA-based cellular networks, which each base station (BS) needs to decide as subchannel, if any, allocate its associated mobile stations (MS) for data transmission. In general, there exists a trade-off between total throughput (sum throughputs all MSs) and fairness under allocations found by resou...