Receiver for different frequencies and modulations
An example wireless communication system receives signals from several wireless systems such as for example a tire pressure monitoring (TPM) system, a remote keyless entry (RKE) system, and a passive start and entry (PASE) system. Each of the systems provides different signals of different frequencies and modulations. The example receiver includes multiple channels that correspond to the signals from each of the example systems. Each of the channels is operable concurrently to monitor and receive signals from each of the system according to a desired hierarchy. The multiple channels eliminate transmission collisions between signals from the different systems.
1 . A communication system for a motor vehicle comprising:
a receiver including a plurality of channels that are each configured to receive a desired radio frequency signal; and
a controller for controlling receipt of signals on the plurality of channels.
2 . The system as recited in claim 1 , wherein the receiver monitors the plurality of channels for a signal corresponding to one of the plurality of channels desired radio frequency signal.
3 . The system as recited in claim 2 , wherein the receiver monitors the plurality of channels concurrently.
4 . The system as recited in claim 2 , wherein the controller cycles the receiver between an on condition that monitors radio signals and an off condition.
5 . The system as recited in claim 3 , wherein the receiver engages one of the plurality of channels responsive to receiving a radio signal corresponding to the one channel.
6 . The system as recited in claim 5 , wherein the receiver detects the one of the plurality of signals responsive to a received signal strength for the desired radio signal being above a desired level.
7 . The system as recited in claim 1 , wherein one of the plurality of channels receives a Frequency Shift Keyed signal from a tire pressure monitoring transmitter.
8 . The system as recited in claim 1 , wherein one of the plurality of channels receives an Amplitude Shift Keyed signal from a remote keyless entry system.
9 . The system as recited in claim 1 , wherein one of the plurality of channels receives a Frequency Shift Keyed signal from a passive start and entry system.
10 . The system as recited in claim 1 , wherein each of the plurality of channels receives a radio frequency signal at a different frequency.
11 . A method of operating a communication system for a motor vehicle comprising the steps of:
a) monitoring a plurality of channels concurrently with a receiver disposed within a motor vehicle;
b) switching to a single one of the plurality of channels responsive to detecting a radio frequency signal corresponding one of the plurality of channels; and
c) receiving the radio frequency signal on the one of the plurality of channels.
12 . The method as recited in claim 11 , wherein a controller cycles the receiver between an on condition to monitor the plurality of channels concurrently, and an off condition.
13 . The method as recited in claim 11 , wherein the step of detecting a radio frequency signal includes detecting a received signal strength of a radio frequency above a desired value.
14 . The method as recited in claim 11 , including the step of monitoring the plurality of channels for a remote keyless entry signal and a tire pressure monitoring signal of a different radio frequency concurrently.
15 . The method as recited in claim 11 , including the step of monitoring the plurality of channels for a passive start and entry signal and a tire pressure monitoring signal of a different radio frequency concurrently.