Accession Number : AD0725755

Title :   Theoretical Study of the Synchronous Demodulation Problem for a Walsh Wave Receiver.

Descriptive Note : Final rept.,

Corporate Author : MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Harmuth,Henning F. ; Frank,Thomas H.

Report Date : JUN 1971

Pagination or Media Count : 88

Abstract : It is well known that the usual frequency filters based on sine-cosine functions do not require synchronization. Furthermore, sinusoidal electromagnetic waves of different frequency can be separated in mobile communication without any synchronization between the various transmitters and receivers. It is widely believed that this is a result of certain shift invariant features of sinusoidal functions that do not exist for other functions. The purpose of this report is to show by means of simple examples that there are infinitely many systems of functions on which one may base asynchronous filters and mobile radio communication. The difference in the usefulness of these systems of functions depends on the state of technology, no system is inherently better than others. (Author)

Descriptors :   (*RADIO WAVES, FUNCTIONS(MATHEMATICS)), (*COMMUNICATION AND RADIO SYSTEMS, MOBILE), (*ELECTRIC FILTERS, *SYNCHRONIZATION(ELECTRONICS)), DEMODULATION, AMPLITUDE MODULATION

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE