Techniques for the realization of ultra- reliable spaceborne computer Final report

Bibliography and new techniques for use of error correction and redundancy to improve reliability of spaceborne computer

Self-concatenated coding for wireless communication systems

In this thesis, we have explored self-concatenated coding schemes that are designed for transmission over Additive White Gaussian Noise (AWGN) and uncorrelated Rayleigh fading channels. We designed both the symbol-based Self-ConcatenatedCodes considered using Trellis Coded Modulation (SECTCM) and bit-based Self- Concatenated Convolutional Codes (SECCC) using a Recursive Systematic Convolutional (RSC) encoder as constituent codes, respectively. The design of these codes was carried out with the aid of Extrinsic Information Transfer (EXIT) charts. The EXIT chart based design has been found an efficient tool in finding the decoding convergence threshold of the constituent codes. Additionally, in order to recover the information loss imposed by employing binary rather than non-binary schemes, a soft decision demapper was introduced in order to exchange extrinsic information withthe SECCC decoder. To analyse this information exchange 3D-EXIT chart analysis was invoked for visualizing the extrinsic information exchange between the proposed Iteratively Decoding aided SECCC and soft-decision demapper (SECCC-ID). Some of the proposed SECTCM, SECCC and SECCC-ID schemes perform within about 1 dB from the AWGN and Rayleigh fading channels’ capacity. A union bound analysis of SECCC codes was carried out to find the corresponding Bit Error Ratio (BER) floors. The union bound of SECCCs was derived for communications over both AWGN and uncorrelated Rayleigh fading channels, based on a novel interleaver concept.Application of SECCCs in both UltraWideBand (UWB) and state-of-the-art video-telephone schemes demonstrated its practical benefits.In order to further exploit the benefits of the low complexity design offered by SECCCs we explored their application in a distributed coding scheme designed for cooperative communications, where iterative detection is employed by exchanging extrinsic information between the decoders of SECCC and RSC at the destination. In the first transmission period of cooperation, the relay receives the potentially erroneous data and attempts to recover the information. The recovered information is then re-encoded at the relay using an RSC encoder. In the second transmission period this information is then retransmitted to the destination. The resultant symbols transmitted from the source and relay nodes can be viewed as the coded symbols of a three-component parallel-concatenated encoder. At the destination a Distributed Binary Self-Concatenated Coding scheme using Iterative Decoding (DSECCC-ID) was employed, where the two decoders (SECCC and RSC) exchange their extrinsic information. It was shown that the DSECCC-ID is a low-complexity scheme, yet capable of approaching the Discrete-input Continuous-output Memoryless Channels’s (DCMC) capacity.Finally, we considered coding schemes designed for two nodes communicating with each other with the aid of a relay node, where the relay receives information from the two nodes in the first transmission period. At the relay node we combine a powerful Superposition Coding (SPC) scheme with SECCC. It is assumed that decoding errors may be encountered at the relay node. The relay node then broadcasts this information in the second transmission period after re-encoding it, again, using a SECCC encoder. At the destination, the amalgamated block of Successive Interference Cancellation (SIC) scheme combined with SECCC then detects and decodes the signal either with or without the aid of a priori information. Our simulation results demonstrate that the proposed scheme is capable of reliably operating at a low BER for transmission over both AWGN and uncorrelated Rayleigh fading channels. We compare the proposed scheme’s performance to a direct transmission link between the two sources having the same throughput

Space programs summary no. 37-37, volume IV for the period December 1, 1965 to January 31, 1966. Supporting research and advanced development

Guidance and control, engineering development, environmental simulation, jet propulsion, space science, and telecommunication

MediaSync: Handbook on Multimedia Synchronization

This book provides an approachable overview of the most recent advances in the fascinating field of media synchronization (mediasync), gathering contributions from the most representative and influential experts. Understanding the challenges of this field in the current multi-sensory, multi-device, and multi-protocol world is not an easy task. The book revisits the foundations of mediasync, including theoretical frameworks and models, highlights ongoing research efforts, like hybrid broadband broadcast (HBB) delivery and users' perception modeling (i.e., Quality of Experience or QoE), and paves the way for the future (e.g., towards the deployment of multi-sensory and ultra-realistic experiences). Although many advances around mediasync have been devised and deployed, this area of research is getting renewed attention to overcome remaining challenges in the next-generation (heterogeneous and ubiquitous) media ecosystem. Given the significant advances in this research area, its current relevance and the multiple disciplines it involves, the availability of a reference book on mediasync becomes necessary. This book fills the gap in this context. In particular, it addresses key aspects and reviews the most relevant contributions within the mediasync research space, from different perspectives. Mediasync: Handbook on Multimedia Synchronization is the perfect companion for scholars and practitioners that want to acquire strong knowledge about this research area, and also approach the challenges behind ensuring the best mediated experiences, by providing the adequate synchronization between the media elements that constitute these experiences

13th Annual Review of Progress in Applied Computational Electromagnetics at the Naval Postgraduate School, Monterey, CA, March 17-21, 1997, Conference Proceedings Volumes I & II

Includes Volumes 1 &

Embodied Ethos: Negotiations of Authority, Credibility, and Trust in Roman Republican Coinage and Renaissance Texts

“Embodied Ethos” explores how coins negotiate rhetors’ ethos in antiquity and how Renaissance texts illustrated with coin images reconstruct and appropriate the ethos of ancient coins. With a methodological framework that puts in conversation ancient rhetorical theories, modern theories in visual and material rhetoric, and cognitive linguistics, the project approaches ethos as an interweaving of authority, credibility, and trust, as well as a form of inter-subjectivity between rhetors and audiences. Applied to a discussion of early Greek and Roman coinage, this framework reveals that the negotiation of ethos occurs in relation to transcendental, social, or individual systems of power, truths, and values. An analysis of Roman Republican coins minted at the onset of the civil war between Caesar and Pompey suggests that the warrying factions use coin iconography and inscriptions to negotiate the leaders’ ethos and to mount responses to political crises. While Pompeian coinage invokes Rome’s past and elevates Pompey to transcendental status, Caesarean coinage invokes Rome’s future and encourages allegiance to Caesar as an individual. In the Renaissance, coin images import the ethos of ancient coins into printed texts. Guillaume Rouillé’s Promptuaire des medalles integrates coin images into literacy-based contexts and appropriates the ethos of ancient coins in order to energize the life of the text, to advance a form of literacy that balances oral and visual reading, and to help audiences negotiate their own ethos as readers. Madeleine de Scudéry’s Les Femmes illustres appropriates the ethos of ancient coins to support the ethos of women as marginalized rhetors. In this text, coin images invoke the public roles of famous women of antiquity, draw attention to the female orators as a community of speakers, and encourage audiences to accept and read a rhetorical text about women. Overall, the transmission of coin ethos from antiquity into the Renaissance suggests that, as objects of cultural significance, coins participate in complex networks of objects and texts and carry persuasive messages across cultures and time periods

Sea-changes

E. M. Forster first encountered Billy Budd in 1926. Some twenty years later, he embarked on a collaboration with Benjamin Britten and Eric Crozier, adapting Melville’s novella for the opera stage. The libretto they produced poignantly reaffirms the Forsterian creed of salvation through personal relationships. This study presents an extensive exploration of Forster’s involvement in the interpretation, transformation and re-creation of Melville’s text. It situates the story of the Handsome Sailor in the wider context of Forster’s literary oeuvre, his life, and his life writings. In detailed readings, Billy Budd becomes a lens through which the themes, patterns and leitmotifs of Forsterian thought and creative imagination are brought into focus. A close re-examination of the libretto sketches serves to shed new light on the collaborative process in which Melville’s story was changed to fit an archetypal array of plot and character types that is central to Forster’s own storytelling