Analysis of large area synchronous codedivision multiple access (LAS-CDMA)
Brooks, Stephen A.
Robertson, R. Clark
Ha, Tri T.
MetadataShow full item record
Large area synchronous code-division multiple access (LAS-CDMA) is a proposed fourth generation cellular standard. Similar to cdma2000, the distinguishing feature of LAS-CDMA is the new set of spreading codes used to separate users in the wireless channel. This thesis examines the properties of the new spreading codes. Unlike Walsh functions, which are orthogonal only when perfectly synchronized, LAS-CDMA spreading codes are orthogonal when synchronized within a nine-chip interference-free time window. The interference-free time window allows LAS-CDMA to transmit the forward link and reverse link over the same frequency band. The primary LAS-CDMA data channels are examined. LAS-CDMA uses a separate set of modulation and coding rate combinations for voice and data communications. Analysis of the effect of a tone jammer on the modulation and coding rate combinations is presented. Also, the ease with which LAS-CDMA can be intercepted is examined, and the security of LAS-CDMA is analyzed.
Showing items related by title, author, creator and subject.
Mackin, Jere Gene (Monterey, California. Naval Postgraduate School, 1972-06);An apparatus was designed and constructed to measure the modulation transfer function of the atmospheric medium as a function of wavelength of light. The modulation transfer function (MTF) in this case was considered ...
Vibration Reduction for Flexible Spacecraft Attitude Control Using PWPF Modulator and Smart Structures Song, G.; Agrawal, B.N. (1999);This paper presents a new approach to vibration reduction of flexible spacecraft during attitude control by using Pulse Width Pulse Frequency (PWPF) Modulator for thruster firing and smart materials for active vibration ...
Autonomous time-frequency cropping and feature-extraction algorithms for classification of LPI radar modulations Zilberman, Eric R. (Monterey, California. Naval Postgraduate School, 2006-06);Three autonomous cropping and feature extraction algorithms are examined that can be used for classification of low probability of intercept radar modulations using time-frequency (T-F) images. The first approach, Erosion ...