Theoretical Study of the Synchronous Demodulation Problem for a Walsh Wave Receiver.
MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL ENGINEERING
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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
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation
- Radio Communications