Author: Raimundo Sampaio NetoPublisher:
ISBN:
Category : Electric interference
Languages : en
Pages : 508
Book Description
Spread-spectrum Code Tracking in the Presence of Interference
Author: Raimundo Sampaio NetoPublisher:
ISBN:
Category : Electric interference
Languages : en
Pages : 508
Book Description
On the Performance of the Direct-sequence Spread-spectrum Code Tracking in the Presence of Cyclostationary Interference
Author: Haiping TsouPublisher:
ISBN:
Category : Cyclostationary waves
Languages : en
Pages : 882
Book Description
Probability of Capture and Rejection of Primary Multiple-Access Interference in Spread-Spectrum Networks
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Book Description
The probability of capture is evaluated for the situation in which several transmitters use the same spread-spectrum code to contend for the attention of a single receiver. The first stage in the capture mechanism is that of acquisition of capture; randomization of the arrival time has been proposed by Davis and Cronemayer to provide delay capture and the probability of this occurrence has been derived. We are concerned with the second stage, that of retaining capture in the presence of interference from the contending users. The probability of retaining capture is computed via accurate approximations and upper bounds for direct-sequence, frequency-hopped and hybrid spread- spectrum signaling formats and for different data modulation and demodulation schemes. The calculation of the overall probability of capture is carried out for spread-spectrum systems with and without forward-error-control; in the latter case Reed-Solomon codes, as well as binary convolutional codes, are considered. Finally, the capability of rejecting primary multiple-access interference in spread-spectrum radio networks is examined by computing the maximum number of users which can contend for the same receiver without causing the probability of capture to fall below some desirable level.
Coding and Modulation Techniques for Hybrid Spread Spectrum Communications Systems in the Presence of Fading, Partial Band Noise, Multiple Access Interference and AWGN
Author: Laith Hadi SadiqProceedings
Author: Research in Progress
Author: United States. Army Research OfficePublisher:
ISBN:
Category : Military research
Languages : en
Pages : 284
Book Description
Vols. for 1977- consist of two parts: Chemistry, biological sciences, engineering sciences, metallurgy and materials science (issued in the spring); and Physics, electronics, mathematics, geosciences (issued in the fall).
Official Gazette of the United States Patent and Trademark Office
Author: United States. Patent and Trademark OfficePublisher:
ISBN:
Category : Patents
Languages : en
Pages : 1046
Book Description
Proceedings
Author: International Telemetering ConferencePublisher:
ISBN:
Category : Telemeter
Languages : en
Pages : 706
Book Description
Research in Progress
Author: Performance Analysis of Coded Frequency-Hopped Spread-Spectrum Systems with Unknown Interference
Author: M. V. HedgePublisher:
ISBN:
Category :
Languages : en
Pages : 117
Book Description
Two classes of problems are considered. In the first class we model the process of communicating in the presence of interference, which is unknown or hostile, as a two-person zero sum game with the communicator and the jammer as the players. The objective functions we consider are mutual information and the channel cutoff rate. The communicator's strategies are distributions on the input alphabet and on a set of quantizers and the jammer's strategies are distributions on the noise power subject to certain constraints. We consider various conditions on the jammer's strategy set and on the communicator's knowledge. For the case with the decoder uninformed of the actual quantizer chosen, we show that, from the communicator's perspective the worst-case jamming strategy is a distribution concentrated at a finite number of points thereby converging a functional optimisation problem into a nonlinear programming problem. Moreover, we are able to also characterize the worst-case distributions by means of necessary and sufficient conditions which are easy to verify. For the case with the decoder informed of the actual quantizer chosen we are able to demonstrate the existence of saddle-point strategies.