Accession Number : AD0713674

Title :   A NEW SATELLITE MULTIPLE ACCESS TECHNIQUE.

Descriptive Note : Technical rept.,

Corporate Author : ROME AIR DEVELOPMENT CENTER GRIFFISS AFB N Y

Personal Author(s) : Patti,John J.

Report Date : SEP 1970

Pagination or Media Count : 159

Abstract : The Second Order Coherent Multiple Access (SOCMA) technique is proposed to satisfy the simultaneous demands of a large group of communications satellite users. The three basic satellite multiple access techniques, time, frequency, and code division techniques, are briefly reviewed. The performance of SOCMA is evaluated and compared to that of the three basic techniques. The analysis uses random waveform computer simulation to investigate the SOCMA performance. The goodness of the random waveform simulation, in terms of simulation precision, is evaluated by application of the Chi-Square test. For this evaluation, a Quadratic/Gradient optimization algorithm is formulated which approximates the Chi-square surface in a local neighborhood of the mean and standard deviation by a parabolic surface. Utilizing this algorithm, a minimum Chi-square is found which yields the best fit of the normal distribution to the sample histogram distribution. (Author)

Descriptors :   (*COMMUNICATION SATELLITES(PASSIVE), RADIO SIGNALS), (*RADIO TRANSMISSION, SIGNAL-TO-NOISE RATIO), TRANSMITTER RECEIVERS, STATISTICAL ANALYSIS, MONTE CARLO METHOD, TRANSFORMATIONS(MATHEMATICS), VECTOR ANALYSIS, POWER SPECTRA, SPECTRUM ANALYZERS, PHASE SHIFT CIRCUITS, FREQUENCY MODULATION, COMPUTER PROGRAMS, INTEGRAL TRANSFORMS, NUMERICAL INTEGRATION

Subject Categories : Unmanned Spacecraft
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE