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 digital television (DTV) signals for use as terrestrial ranging signals, a DTV signal comprising synchronization bursts which are equally spaced in time;
a filter operatively connected to and shared in common with both the radio subsystem and the ranging signal receiving subsystem, the filter having a bandpass that is smaller than a bandwidth of the DTV signal; and
a correlation subsystem operatively connected to the filter, the correlation subsystem operable to enable recovery of the synchronization bursts without demodulating the DTV signal by correlating the DTV signal with a known sequence that has been predistorted to account for the bandpass of the filter.
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Accused Products
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 digital television (DTV) signals for use as terrestrial ranging signals, a DTV signal comprising synchronization bursts which are equally spaced in time; a filter operatively connected to and shared in common with both the radio subsystem and the ranging signal receiving subsystem, the filter having a bandpass that is smaller than a bandwidth of the DTV signal; and a correlation subsystem operatively connected to the filter, the correlation subsystem operable to enable recovery of the synchronization bursts without demodulating the DTV signal by correlating the DTV signal with a known sequence that has been predistorted to account for the bandpass of the filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of processing a digital television (DTV) signal for use as a terrestrial ranging signal in a mobile terminal implementing a terrestrial ranging signal receiver, the method comprising:
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receiving the DTV signal, the DTV signal comprising synchronization bursts which are equally spaced in time; passing the DTV signal through a filter shared in common with both the ranging signal receiver and a radio subsystem of the mobile terminal, the filter having a bandpass that is smaller than the bandwidth of the DTV signal, but substantially equal to or greater than the bandwidth of a native radio signal; and recovering the synchronization bursts without demodulating the DTV signal by correlating the DTV signal with a known sequence that has been predistorted to account for the bandpass of the 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 digital television (DTV) signal for use as a terrestrial ranging signal, the DTV signal comprising synchronization bursts which are equally spaced in time; means for passing the DTV signal through a filter shared in common with both the means for receiving a DTV signal and a radio subsystem of the apparatus, the filter having a bandpass that is smaller than the bandwidth of the DTV signal, but substantially equal to or greater than the bandwidth of a native radio signal; and means for recovering the synchronization bursts without demodulating the DTV signal by correlating the DTV signal with a known sequence that has been predistorted to account for the bandpass of the filter. - View Dependent Claims (14, 15)
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Specification