Pulse or digital communications – Systems using alternating or pulsating current
Reexamination Certificate
2005-05-31
2005-05-31
Liu, Shuwang (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
C375S295000, C375S141000, C370S213000, C370S324000
Reexamination Certificate
active
06901112
ABSTRACT:
An ultra wide bandwidth, high speed, spread spectrum communications system uses short wavelets of electromagnetic energy to transmit information through objects such as walls or earth. The communication system uses baseband codes formed from time shifted and inverted wavelets to encode data on a RF signal. Typical wavelet pulse durations are on the order of 100 to 1000 picoseconds with a bandwidth of approximately 8 GHz to 1 GHz, respectively. The combination of short duration wavelets and encoding techniques are used to spread the signal energy over an ultra wide frequency band such that the energy is not concentrated in any particular narrow band (e.g. VHF: 30-300 MHz or UHF: 300-1000 MHz) and is not detected by conventional narrow band receivers so it does not interfere with those communication systems. The use of pulse codes composed of time shifted and inverted wavelets gives the system according to the present invention has a spatial resolution on the order of 1 foot which is sufficient to minimize the negative effects of multipath interference and permit time domain rake processing.
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McCorkle John W.
Rofheart Martin
Freescale Semiconductor Inc.
Liu Shuwang
Posz Law Group , PLC
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