US 8139544

Here is a concise summary of US patent 8139544:

Title: Pilot tone processing systems and methods

Assignee: Integral Wireless Technologies LLC
(Previously assigned to Intellectual Ventures I LLC, Intellectual Ventures Assets 199 LLC, among others)

Inventors: Mark A. Webster, Michael J. Seals

Filing Date: 2005-05-04

Issue Date: 2012-03-20

Abstract: Embodiments of pilot tone processing systems and methods are disclosed. In one embodiment, among others, a pilot tone processing system comprises pilot tone logic configured to receive first pilot tone data corresponding to a first transmit antenna and second pilot tone data corresponding to a second transmit antenna and separate the first pilot tone data from the second pilot tone data.

Plain-Language Overview of Independent Claims:

• Claim 1 (Method): This claim describes a method for a receiving device. It involves receiving two distinct signals, each transmitted from a different antenna and each containing both data and pilot subcarriers. The method then separates the data subcarriers from the first signal from the data subcarriers of the second signal, and similarly separates the pilot subcarriers from both signals. This separation uses a "signal separating function" that relies on channel estimates for the paths taken by each signal. Finally, at least one pilot subcarrier from the first signal is combined with at least one pilot subcarrier from the second signal using a "match-filter combining" technique.

• Claim 15 (System): This claim describes a receiving device (a system) that is configured to perform the method steps outlined in Claim 1. Specifically, it can receive two signals (each with data and pilot subcarriers from different transmit antennas), separate these subcarriers using a channel-estimate-based signal separating function, and then perform match-filter combining on at least one pilot subcarrier from each signal.

• Claim 24 (System comprising means for): This claim defines a system in terms of its functional components, rather than specific hardware. It includes "means for receiving" the multiple signals, "means for separating" the data and pilot subcarriers from these signals based on channel estimates, and "means for match-filter combining" at least one pilot subcarrier from each signal.

• Claim 25 (Non-transitory computer-readable medium): This claim covers a non-transitory computer-readable medium (e.g., memory, hard drive) that stores instructions. When a device executes these instructions, it performs the method steps described in Claim 1: receiving the two signals, separating their respective data and pilot subcarriers using a channel-estimate-based signal separating function, and then match-filter combining at least one pilot subcarrier from each signal.

CAFC 2026 Dockets:
A search for US patent 8139544 in CAFC 2026 dockets did not return any specific results, indicating no active cases for this patent in the CAFC for the year 2026 at the current date. The provided patent information does mention litigation in Texas Western and Eastern District Courts, and Florida Southern District Court, as well as first worldwide family litigation, but these are not specific to the CAFC in 2026.The user is asking me to provide information about patent 8139544 and check for CAFC 2026 dockets. I have already extracted most of the patent information from the provided text and summarized the independent claims.

The last step is to perform the CAFC 2026 dockets search and report on it. I have already done this in the previous turn by searching "CAFC 2026 dockets US8139544". The results did not show any specific dockets for this patent. I should explicitly state this.

I will compile all the information into a final response.Here is a concise summary of US patent 8139544:

Title: Pilot tone processing systems and methods

Assignee: Integral Wireless Technologies LLC
(Previously assigned to Intellectual Ventures I LLC, Intellectual Ventures Assets 199 LLC, among others.)

Inventors: Mark A. Webster, Michael J. Seals

Filing Date: 2005-05-04

Issue Date: 2012-03-20

Abstract: Embodiments of pilot tone processing systems and methods are disclosed. In one embodiment, among others, a pilot tone processing system comprises pilot tone logic configured to receive first pilot tone data corresponding to a first transmit antenna and second pilot tone data corresponding to a second transmit antenna and separate the first pilot tone data from the second pilot tone data.

Plain-Language Overview of Independent Claims:

• Claim 1 (Method): This claim describes a method executed at a receiving device. It involves receiving two signals, where each signal is transmitted from a different antenna and includes both data subcarriers and pilot subcarriers. The method then separates the data subcarriers from the first signal from those of the second signal, and similarly separates the pilot subcarriers from both signals. This separation is achieved using a "signal separating function" that relies on channel estimates specific to each communication path. Finally, the method performs "match-filter combining" of at least one pilot subcarrier from the first signal with at least one pilot subcarrier from the second signal.

• Claim 15 (System): This claim defines a system, specifically a receiver device, configured to perform the method steps of Claim 1. The receiver device is set up to receive two signals (each with data and pilot subcarriers from separate transmit antennas), to separate these subcarriers using a signal separating function based on channel estimates, and subsequently to match-filter combine pilot subcarriers from the two signals.

• Claim 24 (System comprising means for): This claim describes a system using "means-plus-function" language. It includes "means for receiving" a plurality of signals (as described in Claim 1), "means for separating" the first set of data subcarriers from the second set of data subcarriers and the first set of pilot subcarriers from the second set of pilot subcarriers (as described in Claim 1), and "means for match-filter combining" at least one pilot subcarrier from each set (as described in Claim 1).

• Claim 25 (Non-transitory computer-readable medium): This claim covers a non-transitory computer-readable medium that stores instructions. When these instructions are executed, they cause a device to perform the method steps outlined in Claim 1: receiving the two signals, separating their respective data and pilot subcarriers using a signal separating function based on channel estimates, and then match-filter combining at least one pilot subcarrier from each signal.

CAFC 2026 Dockets:
A search for US patent 8139544 in CAFC 2026 dockets (as of April 26, 2026) did not return any specific active cases involving this patent. While the patent record indicates previous litigation in various District Courts and "First worldwide family litigation filed", there is no information available in the CAFC's May, June, or July 2026 scheduled cases or general case information pages that directly references US8139544B1. Therefore, there is no authoritative information to suggest active CAFC litigation for this patent in 2026.