Frequency hopping spread spectrum system with high sensitivity tracking and synchronization for frequency unstable signals
First Claim
1. A wireless spread spectrum communication system for transmitting data comprising:
- a plurality of end point transmitters transmitting data via a frequency hopped spread spectrum signal, the transmitting signal being sent without the benefit of frequency stabilization; and
at least one receiver responsive to the frequency hopping spread spectrum signals, each receiver including;
a correlator that samples at least a first portion of a preamble of the signal and correlates the portion of the preamble with a known preamble pattern to determine a probability of correlation; and
a signal processor that applies an algorithm to the signal in response to the probability of correlation to track a narrowband frequency of the signal based on at least a second portion of the preamble and to decode data encoded within the signal subsequent to the preamble.
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Accused Products
Abstract
A wireless spread spectrum communication system for transmitting data includes a plurality of end point transmitters and at least one receiver. The end point transmitters transmit data via a frequency hopped spread spectrum signal where the transmitting signal is sent without the benefit of frequency stabilization. The receiver is responsive to the frequency hopping spread spectrum signals and includes a correlator and a signal processor. The correlator samples at least a first portion of a preamble of the signal and correlates the portion of the preamble with a known preamble pattern to determine a probability of correlation. The signal processor applies a Fast Fourier Transform algorithm to the signal in response to the probability of correlation to track a narrowband frequency of the signal based on at least a second portion of the preamble and to decode data encoded within the signal subsequent to the preamble.
154 Citations
20 Claims
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1. A wireless spread spectrum communication system for transmitting data comprising:
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a plurality of end point transmitters transmitting data via a frequency hopped spread spectrum signal, the transmitting signal being sent without the benefit of frequency stabilization; and
at least one receiver responsive to the frequency hopping spread spectrum signals, each receiver including;
a correlator that samples at least a first portion of a preamble of the signal and correlates the portion of the preamble with a known preamble pattern to determine a probability of correlation; and
a signal processor that applies an algorithm to the signal in response to the probability of correlation to track a narrowband frequency of the signal based on at least a second portion of the preamble and to decode data encoded within the signal subsequent to the preamble. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification