Mobile terminal implementing a ranging signal receiver and method
First Claim
1. A mobile terminal comprising:
- a radio subsystem operable to receive a radio signal;
a ranging signal receiving subsystem for receiving terrestrial ranging signals, a terrestrial ranging signal comprising synchronization bursts which are equally spaced in time;
a common filter operatively connected to the radio subsystem and the ranging signal receiving subsystem, the common filter having a bandpass that is smaller than a bandwidth of the terrestrial ranging signal; and
a correlation subsystem operatively connected to the common filter, the correlation subsystem operable to enable recovery of the synchronization bursts by correlating the terrestrial ranging signal with a known sequence that has been predistorted to account for the bandpass of the common filter.
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Abstract
Mobile terminal implementing a ranging signal receiver and method. Means are provided to incorporate ranging signal reception capability into a mobile terminal (such as a UMTS terminal) notwithstanding the fact that the ranging signal has a bandwidth that is wider than the bandpass of filtering for native signals within the terminal. A ranging signal receiving subsystem receives broadband signals that comprise synchronization bursts, which are equally spaced in time, such as from digital television stations. A common filter will have a bandpass that it is smaller than the bandwidth of the ranging signals. However, the correlation subsystem of the mobile terminal enables recovery of synchronization bursts by correlating the ranging signal with a known sequence that has been predistorted to account for the bandpass of the common filter.
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Citations
15 Claims
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1. A mobile terminal comprising:
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a radio subsystem operable to receive a radio signal;
a ranging signal receiving subsystem for receiving terrestrial ranging signals, a terrestrial ranging signal comprising synchronization bursts which are equally spaced in time;
a common filter operatively connected to the radio subsystem and the ranging signal receiving subsystem, the common filter having a bandpass that is smaller than a bandwidth of the terrestrial ranging signal; and
a correlation subsystem operatively connected to the common filter, the correlation subsystem operable to enable recovery of the synchronization bursts by correlating the terrestrial ranging signal with a known sequence that has been predistorted to account for the bandpass of the common filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of processing a terrestrial ranging signal in a mobile terminal implementing a terrestrial ranging signal receiver, the method comprising:
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receiving the terrestrial ranging signal, the terrestrial ranging signal comprising synchronization bursts which are equally spaced in time;
passing the terrestrial ranging signal through a common filter having a bandpass that is smaller than the bandwidth of the terrestrial ranging signal, but substantially equal to or greater than the bandwidth of a native radio signal; and
recovering the synchronization bursts by correlating the terrestrial ranging signal with a known sequence that has been predistorted to account for the bandpass of the common filter. - View Dependent Claims (11, 12)
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13. Apparatus providing mobile terminal function and terrestrial ranging signal function, the apparatus comprising:
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means for receiving a terrestrial ranging signal, the terrestrial ranging signal comprising synchronization bursts which are equally spaced in time;
means for passing the terrestrial ranging signal through a common filter having a bandpass that is smaller than the bandwidth of the terrestrial ranging signal, but substantially equal to or greater than the bandwidth of a native radio signal; and
means for recovering the synchronization bursts by correlating the terrestrial ranging signal with a known sequence that has been predistorted to account for the bandpass of the common filter. - View Dependent Claims (14, 15)
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Specification