TRANSMITTER MODULATION SWITCHING
First Claim
1. A method of receiving a signal with a receiver of a remote keyless entry system comprising the steps of:
- a) determining that a received signal strength indicator (RSSI) is saturated such that undesired radio frequency signals prevent clear reception of a desired Amplitude Shift Keyed signal;
b) switching a receiver to Frequency Shift Keyed Modulation responsive to determining that the RSSI is saturated; and
c) sending a signal to a remote transmitter instructing the remote transmitter to send an FSK modulated signal.
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Accused Products
Abstract
An example receiver/transmitter for a passive start and entry system switches between amplitude shift keyed modulation and frequency shift keyed modulation to maintain clear uninterrupted and dependable communication with a remote transmitter in the presence of interfering signals. The receiver/transmitter is switched to receive incoming FSK signals in response to the RSSI becoming saturated by undesired signals. The switch to FSK signal modulation occurs by signaling the remote transmitter to change over and begin sending FSK modulated signals. The FSK modulated signals are then received without significant interference.
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Citations
12 Claims
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1. A method of receiving a signal with a receiver of a remote keyless entry system comprising the steps of:
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a) determining that a received signal strength indicator (RSSI) is saturated such that undesired radio frequency signals prevent clear reception of a desired Amplitude Shift Keyed signal; b) switching a receiver to Frequency Shift Keyed Modulation responsive to determining that the RSSI is saturated; and c) sending a signal to a remote transmitter instructing the remote transmitter to send an FSK modulated signal. - View Dependent Claims (2, 3, 5, 6)
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4. The method as recited in claim 4, wherein the a remote transmitter transmits an ASK signal responsive to a signal from the receiver when the RSSI is saturated.
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7. A remote keyless entry system comprising:
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a receiver/transmitter including a received signal strength indicator (RSSI); a remote transmitter communicating with the receiver/transmitter, the remote transmitter capable of sending an Amplitude Shift Keyed (ASK) signal and a Frequency shift keyed (FSK) signal, wherein the receiver/transmitter is switched over to receive FSK signals and the remote transmitter is switched from an ASK signal to an FSK signal in response to the RSSI becoming saturated such that a desired ASK signal cannot be clearly received. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification