Offset carrier frequency correction in a two-way broadband wireless access system
First Claim
1. A method for locking onto a downstream frequency by a wireless modem in a broadband wireless access system comprising:
- receiving at a radio coupled to the wireless modem, a plurality of signals at least one corresponding to a downstream signal being transmitted on a downstream frequency;
determining, at the wireless modem, if the radio is locked onto the at least one downstream signal received at the radio;
if the radio is locked onto the downstream signal, determining a center frequency of a detected frequency range corresponding to the downstream signal;
if the radio is not locked onto the downstream signal, changing a receiving frequency of the radio by signals from the wireless modem according to a predetermined frequency plan until the radio is locked onto the one downstream signal and then determining the center frequency of the detected frequency range;
determining a frequency offset factor; and
transmitting an instruction from the wireless modem to the radio to operate a frequency other than the center frequency, the frequency other than the center frequency being a function of the frequency offset factor and center frequency.
7 Assignments
0 Petitions
Accused Products
Abstract
A method for correcting for the offset carrier frequency in a wireless modem is provided. The method further allows for the periodic correction of the offset of the carrier frequency. A Fine tuning method is implemented that uses fine tuning frequency increments to determine minimum and maximum edges of a received frequency from which to calculate an offset used to adjust the transmitted frequency or the receiver of the wireless modem. Power correction is performed for variances in received signal power by adjusting an output power relative to differences in received power compared to an expected received power value.
63 Citations
14 Claims
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1. A method for locking onto a downstream frequency by a wireless modem in a broadband wireless access system comprising:
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receiving at a radio coupled to the wireless modem, a plurality of signals at least one corresponding to a downstream signal being transmitted on a downstream frequency; determining, at the wireless modem, if the radio is locked onto the at least one downstream signal received at the radio; if the radio is locked onto the downstream signal, determining a center frequency of a detected frequency range corresponding to the downstream signal; if the radio is not locked onto the downstream signal, changing a receiving frequency of the radio by signals from the wireless modem according to a predetermined frequency plan until the radio is locked onto the one downstream signal and then determining the center frequency of the detected frequency range; determining a frequency offset factor; and transmitting an instruction from the wireless modem to the radio to operate a frequency other than the center frequency, the frequency other than the center frequency being a function of the frequency offset factor and center frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device, comprising:
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a wireless modem; a radio coupled to the wireless modem and configured to receive a plurality of signals at least one corresponding to a downstream signal being transmitted on a downstream frequency; wherein; the wireless modem is configured to, determine if the radio is locked onto the at least one downstream signal received at the radio; if the radio is locked onto the downstream signal, determine a center frequency of a detected frequency range corresponding to the downstream signal; if the radio is not locked onto the downstream signal, changing a receiving frequency of the radio by signars from the wireless modem according to a predetermined frequency plan until the radio is locked onto the one downstream; determine a frequency offset factor; and transmit an instruction from the wireless modem to the radio to operate on a frequency other than the center frequency, the frequency other than the center frequency being a function of the frequency offset factor and center frequency. - View Dependent Claims (11, 12, 13, 14)
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Specification