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We study the capacity of a quantum channel for retrocausal communication, where messages are transmitted backward in time, from a sender in the future to a receiver in the past, through a noisy postselected closed timelike curve (P-CTC)…

量子物理 · 物理学 2026-04-17 Kaiyuan Ji , Seth Lloyd , Mark M. Wilde

In this paper, the capacity of continuous-space electromagnetic channels, where transceivers are confined in given lossy regions, is analyzed. First of all, the regions confining the transceivers are assumed to be filled with dielectric,…

信息论 · 计算机科学 2016-06-21 Wonseok Jeon , Sae-Young Chung

Bistatic backscatter communication (BackCom) allows passive tags to transmit over extended ranges, but at the cost of having carrier emitters either transmitting at high powers or being deployed very close to tags. In this paper, we examine…

信息论 · 计算机科学 2021-11-09 Xiaolun Jia , Xiangyun Zhou , Dusit Niyato , Jun Zhao

Ambient backscatter (AB) communication is an emerging wireless communication technology that enables wireless devices (WDs) to communicate without requiring active radio transmission. In an AB communication system, a WD switches between…

网络与互联网体系结构 · 计算机科学 2019-01-04 Xiaokang Wen , Suzhi Bi , Xiaohui Lin , Lina Yuan , Juan Wang

Optical wireless communication (OWC) using intensity-modulation and direct-detection (IM/DD) has a channel model which possesses unique features, due to the constraints imposed on the channel input. The aim of this tutorial is to overview…

信息论 · 计算机科学 2021-10-13 Anas Chaaban , Zouheir Rezki , Mohamed-Slim Alouini

In this paper, we introduce a new model for RF-powered cognitive radio networks with the aim to improve the performance for secondary systems. In our proposed model, when the primary channel is busy, the secondary transmitter is able either…

网络与互联网体系结构 · 计算机科学 2016-08-10 Dinh Thai Hoang , Dusit Niyato , Ping Wang , Dong In Kim , Zhu Han

The large scale reflector array of programmable metasurfaces is capable of increasing the power efficiency of backscatter communications via passive beamforming and thus has the potential to revolutionize the low-data-rate nature of…

信号处理 · 电气工程与系统科学 2023-03-31 Wei Wang , Bincheng Zhu , Yongming Huang , Wei Zhang

The two-receiver broadcast packet erasure channel with feedback and memory is studied. Memory is modeled using a finite-state Markov chain representing a channel state. Outer and inner bounds on the capacity region are derived when the…

信息论 · 计算机科学 2014-11-11 Michael Heindlmaier , Navid Reyhanian , Shirin Saeedi Bidokhti

This paper studies the performance of backscatter communications (BC) over emerging fluid antenna (FA) technology. In particular, a single-antenna source sends information to a FA reader through the wireless forward (i.e., source-to-tag)…

信息论 · 计算机科学 2024-01-23 Farshad Rostami Ghadi , Masoud Kaveh , Kai-Kit Wong

In optical wireless communications, a broadcast channel (BC) employing intensity modulation and direct detection (IM/DD) is often modelled as a peak-constrained BC. A closed-form expression for its capacity region of the peak-constrained BC…

信息论 · 计算机科学 2022-08-25 Zhenyu Charlus Zhang , Anas Chaaban

Backscatter communication offers a promising solution to connect massive Internet-of-Things (IoT) devices with low cost and high energy efficiency. Nevertheless, its inherently passive nature limits transmission reliability, thereby…

信息论 · 计算机科学 2024-08-19 Hao Chen , Zhizhi Huang , Ying-Chang Liang , Robert Schober

To study the effect of lack of up-to-date channel state information at the transmitters (CSIT), we consider two-user binary fading interference channels with Delayed-CSIT. We characterize the capacity region for such channels under…

信息论 · 计算机科学 2016-11-17 Alireza Vahid , Mohammad Ali Maddah-Ali , Amir Salman Avestimehr

Wireless powered backscatter communications is an attractive technology for next-generation low-powered sensor networks such as the Internet of Things. However, backscattering suffers from collisions due to multiple simultaneous…

信息论 · 计算机科学 2017-07-12 Constantinos Psomas , Ioannis Krikidis

Adaptive control is a control method that has an adaptation mechanism that reacts to model uncertainties. The control method is used to realized synchronization of a new chaotic system in a unidirectional master-slave topology. The master…

信号处理 · 电气工程与系统科学 2019-12-04 Christian Nwachioma

Backscattering tag-to-tag networks (BTTNs) represent a passive radio frequency identification (RFID) system that enables direct communication between tags within an external radio frequency (RF) field. However, low spectral efficiency and…

信息论 · 计算机科学 2024-09-02 Masoud Kaveh , Farshad Rostami Ghadi , Zheng Yan , Riku Jantti

In this work we study the capacity of interference-limited channels with memory. These channels model non-orthogonal communications scenarios, such as the non-orthogonal multiple access (NOMA) scenario and underlay cognitive communications,…

信息论 · 计算机科学 2023-06-02 Ron Dabora , Emeka Abakasanga

Backscatter communication (BSC) is being realized as the core technology for pervasive sustainable Internet-of-Things applications. However, owing to the resource-limitations of passive tags, the efficient usage of multiple antennas at the…

信息论 · 计算机科学 2019-04-18 Deepak Mishra , Erik G. Larsson

Opportunistic spectrum access is based on channel state information and can lead to important performance improvements for the underlying communication systems. On the other hand adaptive modulation is also based on channel state…

网络与互联网体系结构 · 计算机科学 2012-11-26 F. Foukalas , G. T. Karetsos , G. K. Karagiannidis

A long-standing vision of backscatter communications is to provide long-range connectivity and high-speed transmissions for batteryless Internet-of-Things (IoT). Recent years have seen major innovations in designing backscatters toward this…

网络与互联网体系结构 · 计算机科学 2019-12-19 Guochao Song , Hang Yang , Wei Wang , Tao Jiang

The theoretic capacity of a communication system constituted of several transmitting/receiving elements is determined by the singular values of its transfer matrix. Results based on an independent identically distributed channel model,…

数学物理 · 物理学 2012-09-27 François Bentosela , Eric Soccorsi