Results 291 to 300 of about 1,504,963 (315)
Some of the next articles are maybe not open access.
Broadband Coherent Communication System
IETE Technical Review, 2003During the last few years, there has been an increasing demand for high-speed data transmission. Although, fiber optics technology has matured already for high data transport, however, for spaces lacking the fiber infrastructure, wireless technologies are becoming the medium of choice for broadband networking. The first investigations on optoelectronic
openaire +1 more source
Coherent Optical Communication Systems
2011The rapid evolution of long-haul optical communications systems, witnessed in the last five years, is due to the gradual adoption of spectrally efficient, multilevel modulation formats, in conjunction with polarization division multiplexing (PDM) and coherent intradyne detection assisted by digital signal processing (DSP).
openaire +1 more source
Design of Non-Coherent RIS-Empowered DCSK With Two-Level Nested Index Modulation
IEEE Transactions on Wireless CommunicationsNon-coherent chaotic communication has gained increasing attention as it provides an efficient solution for reliable communications without requiring channel state information.
Xiangming Cai +4 more
semanticscholar +1 more source
Coherent fiber communications analyzer
Eletrónica e Telecomunicações, 2012This paper addresses an coherent fiber communication analyzer with digital signal processing (DSP). First we make an overview of the investigations that are being conducted at Instituto de Telecomunicações (IT) in the coherent communications area and then introduce the coherent receiver used in the IT laboratory.
Ferreira, Ricardo M. +3 more
openaire +1 more source
Coherent Optical Communication Systems
IETE Journal of Education, 1997This paper presents an overview of coherent optical fiber communication systems. The fundamental principle is described and the performance limits under shot noise limited operation for various modulation and demodulation schemes are compared with respect to the quantum limit.
openaire +1 more source
On the Degrees of Freedom of IRS-Assisted Non-Coherent MIMO Communications
IEEE Communications Letters, 2022Karim G. Seddik
semanticscholar +1 more source
Coherent multichannel communication systems
Digest of Conference on Optical Fiber Communication, 1992In the past few years enormous advances have been made in lightwave technology providing multichannel transmission over optical fibers. Coherent optical frequency multiplexing communication techniques are a promising way to supply multichannel high capacity communication services. Making use of its high sensitivity, coherent techniques are today on the
openaire +1 more source
Coherent optical space communications
2006This paper reviews the present state of concepts and technologies of coherent optical space communications. Emphasis is placed on the receiving segment. Heterodyne and homodyne reception allows to realize sensitivities close to the theoretical limits which amount to as little as 10 to 40 photons per bit.
openaire +1 more source
Coherent optical fiber communications
SPIE Proceedings, 1991The very high detection sensitivities and selectivities associated with coherent lightwave techniques furnish a basis for the exploitation of the great potential bandwidth of single-mode fibers in point-to-point and point-to-multipoint transmission.
openaire +1 more source