7,532 research outputs found
Single-User Performance of Uplink DS-CDMA using Relay-Assisted Diversity
No full textIn a wireless system with distributed mobile users, several mobile users may cooperate with each other in order to achieve the transmit diversity. In this contribution we investigate the single-user performance of an uplink direct-sequence code-division multiple-access (DS-CDMA) scheme, where one user is assisted by several other users (relays) so as to achieve the relay-assisted diversity. Specifically, the performance of the relay-assisted DS-CDMA is investigated, when communications from the transmitter to the relays and that from the relays to the base-station (BS) receiver may experience different fading. In our study two types of detection schemes are invoked. The first detection scheme is a maximal ratio combining (MRC) assisted single-user detection (SUD) scheme, which maximizes the output signal-to-noise ratio (SNR) without taking the interference among the relays into account. By contrast, the second, detection scheme maximizes the output signal-to-interference-plus-noise ratio (MSINR), which is a multiuser detection (MUD) scheme that is capable of suppressing the interference among the relays. Our study and results show that, in a relay-assisted DS-CDMA without using orthogonal spreading codes, the relay-assisted diversity may only be achievable after suppressing the inter-relay interference
SUPERSEDED - Additional files for 'Using sound to understand protein sequence data: new sonification algorithms for protein sequences and multiple sequence alignments'
No full text## This item has been replaced by the one which can be found at https://doi.org/10.7488/ds/3023 ## Supplementary data for Martin EJ, Meagher TR and Barker D, 'Using sound to understand protein sequence data: new sonification algorithms for protein sequences and multiple sequence alignments' (in prep.). See 'README.txt' for further details.See 'README.txt' file within the zipfile.See 'README.txt' file
Initial Synchronisation in the Multiple-Input Multiple-Output Aided Single- and Multi-Carrier DS-CDMA as well as DS-UWB Downlink
No full textIn this thesis, we propose and investigate code acquisition schemes employing both colocated and cooperative Multiple Input/Multiple Output (MIMO) aided Single-Carrier (SC) and Multi-Carrier (MC) Code Division Multiple Access (CDMA) DownLink (DL) schemes. We study their characteristics and performance in terms of both Non-Coherent (NC) and Differentially Coherent (DC) MIMO scenarios. Furthermore, we also propose iterative code acquisition schemes for the Direct Sequence-Ultra WideBand (DS-UWB) DL. There is a paucity of code acquisition techniques designed for transmit diversity aided systems. Moreover, there are no in-depth studies representing the fundamental characteristics of code acquisition schemes employing both co-located and cooperative MIMOs. Hence we investigate both NC and DC code acquisition schemes in the co-located and cooperative MIMO aided SC and MC DS-CDMA DL, when communicating over spatially uncorrelated Rayleigh channels. The issues of NC initial and post-initial acquisition schemes as well as DC schemes are studied as a function of the number of co-located antennas by quantifying the attainable correct detection probability and mean acquisition time performances. The research of DS-UWB systems has recently attracted a significant interest in both the academic and industrial community. In the DS-UWB DL, initial acquisition is required for both coarse timing as well as code phase alignment. Both of these constitute a challenging problem owing to the extremely short chip-duration of UWB systems. This leads to a huge acquisition search space size, which is represented as the product of the number of legitimate code phases in the uncertainty region of the PN code and the number of legitimate signalling pulse positions. Therefore the benefits of the iterative code acquisition schemes are analysed in terms of the achievable correct detection probability and mean acquisition time performances. Hence we significantly reduce the search space size with the aid of a Tanner graph based Message Passing (MP) technique, which is combined with the employment of beneficially selected generator polynomials, multiple receive antennas and appropriately designed multiple-component decoders. Finally, we characterise a range of two-stage iterative acquisition schemes employing iterative MP designed for a multiple receive antenna assisted DS-UWB DL scenario
Study of DS-CDMA, RAKE Receiver and Proposal for a Multicarrier DS-CDMA System
No full textThis paper gives a review of DS-CDMA, RAKE receiver and multicarrier DS-CDMA as well as a proposal and numerical result for a multicarrier DS-CDMA system. This paper is organized as follows: Section I introduces the development of methods for wireless communication over multipath fading channel. Section II gives Turin's evaluation of the effects of multipath and fading on the performance of DS-CDMA systems. Section III gives Pursley's evaluation of this issue. Section IV explains the structure and performance of conventional RAKE receiver. Section V shows Sourour's work on Multicarrier DS-CDMA. Section VI is a proposal for a multicarrier DS-CDMA system and some numerical results I have gotten. Section VII is devoted to the conclusions and future work
Towards an integrated approach to industry dynamics and labour mobility
No full textIndustrial dynamics and labour mobility are two fields of economic research that have developed fast in recent years, but along what are essentially separate lines. This paper shows that the processes those two fields deal with can be highly interdependent, and demonstrates the usefulness of (and the opportunity for) an integrated approach to the dynamics of industries and labour mobility. It concludes with a list of questions that inform a research agenda dedicated to such approach.
Assessment of the statistical relevance of TR-PIV datasets
No full textThe increasing interest for high repetition rate global optical measurement techniques such as Time-Resolved Particle Image Velocimetry (TR-PIV) raises a number of questions concerning their ability to provide relevant statistical and spectral quantities. In an effort to address this issue, complementary TR-PIV and Laser Doppler Velocimetry (LDV) measurements have been carried out. An application to the analysis of the detached flow over a NACA 0015 airfoil at a Reynolds number Re=105 in a water tunnel is proposed
Pipe Cleaning using 3M HFE Solvents and the RAAF Oxygen System Pipe Cleaning System
No full textU) 4. AUTHOR(S) 5. CORPORATE AUTHOR Platforms Sciences Laboratory 506 Lorimer St Fishermans Bend Victoria 3207 Australia 6a. DSTO NUMBER 6b. AR NUMBER 6c. TYPE OF REPORT Technical Report 7. DOCUMENT DATE 8. FILE NUMBER 2003/77175/1 9. TASK NUMBER AIR 02/148 10. TASK SPONSOR DGTA/ OIC AMPTS 11. NO. OF PAGES 46 12. NO. OF REFERENCES ..
TR-60 Trolley Dump, owned by the Anaconda Co., Lt8 17637
No full textPhotograph of a Series TR-60 (Model A-4) Trolly Dump. Completed in July 1959, according to author Eric Orlemann, this unit was used by the Anaconda Company at its Berkeley Pit in Butte. Montana
TR-60 Trolley Dump, owned by the Anaconda Co., Lt8 17650
No full textPhotograph of a Series TR-60 (Model A-4) Trolly Dump. Completed in July 1959, according to author Eric Orlemann, this unit was used by the Anaconda Company at its Berkeley Pit in Butte. Montana
ARTMAP-DS: Pattern Discrimination by Discounting Similarities
No full textARTMAP-DS extends fuzzy ARTMAP to discriminate between similar inputs by discounting similarities. When two or more candidate category representations are activated by a given input, features that the candidate representations have in common are ignored prior to determining the winning category. Simulations illustrate the network's ability to recognize similar inputs, such as STAR and START, in a noisy environment.National Science Foundation (IRI-94-01659); Office of Naval Research (N00014-95-1-0409, N00014-95-1-0657
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