SFWRENG 4J03 Lecture Notes - Lecture 1: Spectral Efficiency, Spread Spectrum, Error Function
12 Oct 2016
School
Department
Course
Professor
Document Summary
Properties of maximal length sequences 3: balance property 3. P01 = p(y < 01 symbol 1" was sent y d. Data sequence occupies a b in excess of min b necessary to send it. Spread spectrum is accomplished before transmission ion through the use of a code independent of data sequence. The same code is used in the receiver to despread the received signal in order to get back original signal. Spectrum: what are the magnitudes at each point in time. Pseudo noise (pn) sequence code: periodic binary sequence with a noise-like waveform, generated by means of a linear feedback shift register. Period of a pn sequence with m flip-flops cannot exceed 2m 1. Maximal length sequence: pn sequence if p = 2m 1. In each period of a maximal length sequence, the number of 1"s is always one more than number of 0"s. The (acp) of a max length sequence is periodic of binary values.
