Estimating the Location of a Wireless Terminal Based on Signal Path Impairment

A method comprising:

• (1) receiving (i) a first measured pathloss for a first signal that is processed by a wireless terminal and (ii) a second measured pathloss for a second signal that is processed by the wireless terminal;
• and
• (2) estimating the location of the wireless terminal based on the first measured pathloss and the second measured pathloss.

A method comprising:

• (1) receiving (i) a first measured pathloss for a first signal that is processed by a wireless terminal at a first time T1 and (ii) a second measured pathloss for the first signal at a second time T2, wherein the first time does not equal the second time;
• and
• (2) estimating the location of the wireless terminal at the second time based on (i) the first measured pathloss, (ii) the second measured pathloss, and (iii) an estimate of the probability that the wireless terminal in the location at a time T will still be in the location at a time T+Δt.

A method comprising:

• estimating the location of a wireless terminal based on a measured error rate for a signal as processed by the wireless terminal.

A method comprising:

• (1) receiving (i) a first measured error rate for a first signal that is processed by a wireless terminal and (ii) a second measured error rate for a second signal that is processed by the wireless terminal;
• and
• (2) estimating the location of the wireless terminal based on the first measured error rate and the second measured error rate.

A method comprising:

• (1) receiving (i) a first measured error rate for a first signal that is processed by a wireless terminal at a first time T1 and (ii) a second measured error rate for the first signal at a second time T2, wherein the first time does not equal the second time;
• and
• (2) estimating the location of the wireless terminal at the second time based on (i) the first measured error rate, (ii) the second measured error rate, and (iii) an estimate of the probability that the wireless terminal in the location at a time T will still be in the location at a time T+Δt.

A method comprising:

• estimating the location of a wireless terminal based on a measured signal-to-impairment ratio for a signal as processed by the wireless terminal.

A method comprising:

• (1) receiving (i) a first measured signal-to-impairment ratio for a first signal that is processed by a wireless terminal and (ii) a second measured signal-to-impairment ratio for a second signal that is processed by the wireless terminal;
• and
• (2) estimating the location of the wireless terminal based on the first measured signal-to-impairment ratio and the second measured signal-to-impairment ratio.

A method comprising:

• (1) receiving (i) a first measured signal-to-impairment ratio for a first signal that is processed by a wireless terminal at a first time T1 and (ii) a second measured signal-to-impairment ratio for the first signal at a second time T2, wherein the first time does not equal the second time;
• and
• (2) estimating the location of the wireless terminal at the second time based on (i) the first measured signal-to-impairment ratio, (ii) the second measured signal-to-impairment ratio, and (iii) an estimate of the probability that the wireless terminal in the location at a time T will still be in the location at a time T+Δt.