Pulse or digital communications – Equalizers
Patent
1997-05-29
2000-10-03
Chin, Stephen
Pulse or digital communications
Equalizers
375346, 375349, 375350, H03H 730, H04B 110
Patent
active
061283371
ABSTRACT:
Methods for identification of, and compensation for, the effects of presence of a multipath signal in a received composite digital signal that includes a direct, distortion-free signal. A direct signal is additively or multiplicatively combined with a distinguishable indicium signal and the resultant signal is transmitted to a receiver. The indicium signal may be distinguished by use of a different frequency or by use of a bit pattern that cannot be included in a direct signal pattern. The receiver identifies the received indicium signal within the received signal, compares the received indicium signal with a reference signal that is substantially a replica of the transmitted indicium signal, determines what operations will convert the reference signal into the received indicium signal, and applies an inverse of these operations to the portion of the received signal that contains the received direct signal, to obtain an enhanced received direct signal with reduced multipath signal effects. An example of the conversion operation is discussed, which can be performed in near real time or in a post-processing mode.
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Janky James M.
Schipper John F.
Chin Stephen
Park Albert
Schipper John
Trimble Navigation Limited
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