229 research outputs found
Building an end user focused THz based ultra high bandwidth wireless access network: The TERAPOD approach
The TERAPOD project aims to investigate and demonstrate the feasibility of ultra high bandwidth wireless access networks operating in the Terahertz (THz) band. The proposed TERAPOD THz communication system will be developed, driven by end user usage scenario requirements and will be demonstrated within a first adopter operational setting of a Data Centre. In this article, we define the full communications stack approach that will be taken in TERAPOD, highlighting the specific challenges and aimed innovations that are targeted
Modeling and Analysis of sub-Terahertz Communication Channel via Mixture of Gamma Distribution
With the recent developments on opening the terahertz (THz) spectrum for
experimental purposes by the Federal Communications Commission, transceivers
operating in the range of 0.1THz-10THz, which are known as THz bands, will
enable ultra-high throughput wireless communications. However, actual
implementation of the high-speed and high-reliability THz band communication
systems should start with providing extensive knowledge in regards to the
propagation channel characteristics. Considering the huge bandwidth and the
rapid changes in the characteristics of THz wireless channels, ray tracing and
one-shot statistical modeling are not adequate to define an accurate channel
model. In this work, we propose Gamma mixture-based channel modeling for the
THz band via the expectation-maximization (EM) algorithm. First, maximum
likelihood estimation (MLE) is applied to characterize the Gamma mixture model
parameters, and then EM algorithm is used to compute MLEs of the unknown
parameters of the measurement data. The accuracy of the proposed model is
investigated by using the Weighted relative mean difference (WMRD) error
metrics, Kullback-Leibler (KL)-divergence, and Kolmogorov-Smirnov test to show
the difference between the proposed model and the actual probability density
functions (PDFs) that are obtained via the designed test environment. According
to WMRD error metrics, KL-divergence, and KS test results, PDFs generated by
the mixture of Gamma distributions fit the actual histogram of the measurement
data. It is shown that instead of taking pseudo-average characteristics of
sub-bands in the wideband, using the mixture models allows for determining
channel parameters more precisely.Comment: This paper has been accepted for publication in IEEE Transactions on
Vehicular Technolog
Building an end user focused THz based ultra high bandwidth wireless access network: The TERAPOD approach
The TERAPOD project aims to investigate and demonstrate the feasibility of ultra high bandwidth wireless access networks operating in the Terahertz (THz) band. The proposed TERAPOD THz communication system will be developed, driven by end user usage scenario requirements and will be demonstrated within a first adopter operational setting of a Data Centre. In this article, we define the full communications stack approach that will be taken in TERAPOD, highlighting the specific challenges and aimed innovations that are targeted
On the Road to 6G: Visions, Requirements, Key Technologies and Testbeds
Fifth generation (5G) mobile communication systems have entered the stage of commercial development, providing users with new services and improved user experiences as well as offering a host of novel opportunities to various industries. However, 5G still faces many challenges. To address these challenges, international industrial, academic, and standards organizations have commenced research on sixth generation (6G) wireless communication systems. A series of white papers and survey papers have been published, which aim to define 6G in terms of requirements, application scenarios, key technologies, etc. Although ITU-R has been working on the 6G vision and it is expected to reach a consensus on what 6G will be by mid-2023, the related global discussions are still wide open and the existing literature has identified numerous open issues. This paper first provides a comprehensive portrayal of the 6G vision, technical requirements, and application scenarios, covering the current common understanding of 6G. Then, a critical appraisal of the 6G network architecture and key technologies is presented. Furthermore, existing testbeds and advanced 6G verification platforms are detailed for the first time. In addition, future research directions and open challenges are identified for stimulating the on-going global debate. Finally, lessons learned to date concerning 6G networks are discussed
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