US 2014/0274162 A1Published application

Method and system to reduce harmonic interference of broadband wireless devices to gps receiver

AssigneeAlcatel-Lucent USA Inc.

InventorsJim J. Chao, Subramanian Vasudevan

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Abstract

A technique for reducing interference in a GPS-equipped wireless device having a transmitter is provided. In doing so, a GPS signal is acquired, and it is determined whether the GPS signal contains valid GPS data, the GPS signal having a GPS frequency range. If the GPS data is not valid due to the noted second harmonic interference, the transmit power levels of the transmitter within different categories of frequency blocks (frequency blocks corresponding to the second harmonic of the transmit frequency of the device interfering with the GPS frequency range entirely, partially and only slightly) are selectively and iteratively determined. The power levels in these frequency blocks are iteratively and selectively reduced to help determine valid GPS data.

Claims14

Dependent claims

A method of reducing interference in a GPS-equipped wireless device having a transmitter, the method comprising:

acquiring a GPS signal containing GPS data, the GPS signal having a GPS frequency range;
decoding the GPS data;
determining whether the GPS data is valid;
when the GPS data is not valid due to interference-first determining a transmit power level of the transmitter within a first plurality of frequency blocks that fall entirely within the GPS frequency range, the first plurality of frequency blocks corresponding to a second harmonic of a transmit frequency of the transmitter and,
when the transmit power level for the first plurality of blocks is not zero, reducing the transmit power level stepwise for the first plurality of frequency blocks until valid GPS data is determined or until the transmit power level for the first plurality of frequency blocks is zero;
second determining, if the transmit power level for the first plurality of frequency blocks is zero, a transmit power level of the transmitter within a second plurality of frequency blocks that fall partially within the GPS frequency range, the second plurality of frequency blocks corresponding to the second harmonic of the transmit frequency of the transmitter and,
when the transmit power level for the second plurality of blocks is not zero, reducing the transmit power level stepwise for the second plurality of frequency blocks until valid GPS data is determined or until the transmit power level for the second plurality of frequency blocks is zero;
and,
third determining, if the transmit power level for the second plurality of frequency blocks is zero, a transmit power level of the transmitter within a third plurality of frequency blocks that fall outside the GPS frequency range, the third plurality of frequency blocks corresponding to the second harmonic of the transmit frequency of the transmitter and,
when the transmit power level for the third plurality of blocks is not zero, reducing the transmit power level stepwise for the third plurality of frequency blocks until valid GPS data is determined or until the transmit power level for the third plurality of frequency blocks is zero.

7 more elements

A system for reducing interference in a wireless device, the system comprising:

a GPS receiver for acquiring a GPS signal containing GPS data, decoding the GPS data, and determining whether the GPS date is valid;
and,
a power control module configured to perform the following when the GPS data is not valid due to interference-first determining a transmit power level of the transmitter within a first plurality of frequency blocks that fall entirely within the GPS frequency range, the first plurality of frequency blocks corresponding to a second harmonic of a transmit frequency of the transmitter and,
when the transmit power level for the first plurality of blocks is not zero, reducing the transmit power level stepwise for the first plurality of frequency blocks until valid GPS data is determined or until the transmit power level for the first plurality of frequency blocks is zero;
second determining, if the transmit power level for the first plurality of frequency blocks is zero, a transmit power level of the transmitter within a second plurality of frequency blocks that fall partially within the GPS frequency range, the second plurality of frequency blocks corresponding to the second harmonic of the transmit frequency of the transmitter and,
when the transmit power level for the second plurality of blocks is not zero, reducing the transmit power level stepwise for the second plurality of frequency blocks until valid GPS data is determined or until the transmit power level for the second plurality of frequency blocks is zero;
and,
third determining, if the transmit power level for the second plurality of frequency blocks is zero, a transmit power level of the transmitter within a third plurality of frequency blocks that fall outside the GPS frequency range, the third plurality of frequency blocks corresponding to the second harmonic of the transmit frequency of the transmitter and,
when the transmit power level for the third plurality of blocks is not zero, reducing the transmit power level stepwise for the third plurality of frequency blocks until valid GPS data is determined or until the transmit power level for the third plurality of frequency blocks is zero.

6 more elements

Dependencies are inferred from the claim text.