Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Pseudo-noise"”.
-
Indoor Positioning Using Acoustic Pseudo-Noise Based Time Difference of Arrival
… studies an IPS approach using audible sound and pseudo-noise (PN) based time difference of arrival (TDoA). The system’s infrastructure consists of synchronized speakers. The object to be located, or receiver, extracts TDoA information and uses multilateration to calculate its position. The …
-
Serial acquisition of PN sequences in direct sequence spread spectrum communication systems
… serial search schemes for the acquisition of a pseudo-noise (PN) sequence in a direct-sequence spread-spectrum (DS/SS) communication system. Serial search acquisition schemes are by far the most commonly used class of acquisition schemes, due to the ease with which they are implemented. The main …
-
Sensor Package Analysis and Simulation for Direct Sensor-to-Satellite Links
… of satellites. Information is spread using pseudo noise (PN) or Barker codes. The sensors use a single circular microstrip patch element with a wide beamwidth or a miniature phased array antenna that continuously scans to access the satellite(s). The array beam is controlled with a …
-
Uranium plant identification using correlation methods
… is described. Generation and properties of pseudorandom ternary m-sequences are discussed, particular attention being given to selection of a suitable sequence for testing a system. The geometry and control policy of the uranium plant is outlined and existing and experimental equipment …
-
Audio-based localisation for ubiquitous sensor networks
… temporal synchronisation can be established. Pseudo-noise 'chirps' are emitted and recorded at each of the nodes. Pair-wise distances are calculated by comparing the difference in the audio delays between the peaks measured in each recording. By removing dependence on fine grained temporal …
-
Design, Analysis And Implementation Of Orthogonal Frequency Coding In Saw Devices Used For Spread Spectrum Tags And Sensors
… and additional coding can be added using a pseudo-noise (PN) sequence. The OFC approach is general and should be applicable to many differing SAW sensors for temperature, pressure, liquid, gases, etc. Device embodiments are shown and a potential transceiver is described. Measured device …
-
Analysis and Dynamic Range Enhancement of the Analog-to-Digital Interface in Multimode Radio Receivers
… spread spectrum systems to optimize quantization noise and distortion due to A/D overload. Lastly, methods for improving the dynamic range of the analog-to-digital interface such as nonuniform quantization, companding, and dither are presented. The development of a novel A/D using a …
-
Node localization in underwater sensor networks (UWSN)
… with the hardware to estimate ToA using single pseudo-noise (PN) and dual PN(DPN) sequences. Both simulation and field test results show that the DPN sequences outperform the single PNs in severely dispersive channels and when the carrier frequency offset (CFO) is high"--Abstract, page iv.</p>
-
Cater: An Opportunistic Medium Access Control Protocol for Wireless Local Area Networks
… As currently proposed, IEEE 802.11 uses a fixed pseudo-noise (PN) code for spreading the information signal, implying a fixed process gain at the receiver. When the channel degrades, IEEE 802.11 offers only retransmissions at the MAC layer to combat a corrupt medium. However, CATER allows …
-
A novel maximal-length sequence synchronisation network
… maximal-length sequences. These are a class of pseudorandom waveforms. Their properties include a two valued autocorrelation function with its maximum value at no code-phase offset. This allows for multiple access to a single resource and the suppression of multi-path interference as adjacent …
-
Performance analysis of assisted-GNSS receivers
… the theoretical mean acquisition time of a pseudo-noise signal for one satellite only. I extend these methods to calculate the full probability distribution of the joint acquisition of several satellites, as well as the sequential acquisition of satellites, which is commonly performed in …
-
Lokalizace akustických zdrojů metodou TDOA
Práce se zabývá teoretickým a praktickým řešením akustické lokalizace metodou TDOA. Rozvádí návrh schémat pro vysílač a přijímač. Dále uvádí způsob komunikace mezi procesorem, který vyhodnocuje přijatý signál, a počítačem, jež výsledek zobrazuje ve srozumitelné podobě. A nakonec se zabývá návrhem …