Novel Sum-of-Sinusoids Simulation Channel Modeling for 6G Multiple-Input Multiple-Output Vehicle-to-Everything Communications

In this paper,a statistical cluster-based simulation channel model with a finite number of sinusoids is proposed for depicting the multiple-input multiple-output(MIMO)communications in vehicleto-everything(V2X)environments.In the proposed sum-of-sinusoids(SoS)channel model,the waves that emerge from the transmitter undergo line-of-sight(LoS)and non-line-of-sight(NLoS)propagation to the receiver,which makes the model suitable for describing numerous V2X wireless communication scenarios for sixth-generation(6G).We derive expressions for the real and imaginary parts of the complex channel impulse response(CIR),which characterize the physical propagation characteristics of V2X wireless channels.The statistical properties of the real and imaginary parts of the complex CIRs,i.e.,autocorrelation functions(ACFs),Doppler power spectral densities(PSDs),cross-correlation functions(CCFs),and variances of ACFs and CCFs,are derived and discussed.Simulation results are generated and match those predicted by the underlying theory,demonstrating the accuracy of our derivation and analysis.The proposed framework and underlying theory arise as an efficient tool to investigate the statistical properties of 6G MIMO V2X communication systems.

The digital‘connected’earth:open technology for providing location-based services on degraded communication environments

n the current world,it is easy to listen that everybody and everything is connected.Over this connected world,the concept of location-based services has grown in order to provide digital services in everyplace and at every time.Nevertheless,this is not 100%true because the connection is not guaranteed for many people and in many places.These are the Degraded Communications Environments(DCE),environments where the availability of high-speed communications is not guaranteed in at least the 75%of the time.This paper works over the experience of a previous work in developing light protocols that do not need broadband for communication.This work provides an extension of these protocols for the inclusion of mobile devices as elements of the communication process and a set of libraries to allow the development of applications in DCE.The work done has involved the development of two frameworks:an Android framework that makes the incorporation of Android devices easier and a server-based framework that provides the server side for the development of the referred applications.A use case that uses these two frameworks has been developed.Finally,all technology developed is available throw a public Git repository.

Parametric array differential Pattern time delay shift coding underwater acoustic communication in the under-ice environment

In order to meet the demands of underwater acoustic communication in under ice environment,a differential Pattern time delay shift coding underwater acoustic communication method based on parametric array is introduced in this paper.The under ice underwater acoustic channel is characterized by heavy multipath transmission.Under this model,a parametric array emission method of Pattern signal is derived and the system performance is analyzed.A broadband low frequency sound waves with narrow beam-pattern,which will reduce the interface reflections and suppress the effects of multipath transmission,can be obtained by the emission method.The Songhua River under ice trial results show that there is an anti-multipath property and a higher data rate in the under-ice acoustic channel in proposed approach.

PERSPECTIVES ON FUTURE EFL COMMUNICATIVE ENVIRONMENTS BY E-MAlL AND INTERNET IN CHINESE UNIVERSITIES

E-mail-assisted language teaching is at the fore-front of the advances in educational tools in EFLteaching.But is it possible to create EFL communica-tive environment by E-mail and Internet in Chineseuniversities?Can we totally adopt CA by E-mail andInternet in Western countries into Chinese universi-ties?It is evident that Completely transferring it toChinese educational context is irrational and will ulti-mately fail.Thus,success depends on reconciling E-mail-assisted EFL teaching with traditional Chineseapproaches.This paper is designed to make perspec-tives on this reconciliation,and presents some disad-vantages of using E-mail and Internet in teaching.