US 7738595

Here is a concise summary of US patent 7738595:

US Patent 7738595: Multiple input, multiple output communications systems

• Title: Multiple input, multiple output communications systems
• Assignee: Integral Wireless Technologies LLC
• Inventor: James Stuart Wight
• Filing Date: July 2, 2004
• Issue Date: June 15, 2010
• Abstract: Embodiments of the present invention include systems and methods for optimizing the transmitter and receiver weights of a MIMO system. In one embodiment, the weights are optimized to create and steer beam nulls, such that each transmitted signal is substantially decoupled from all other signals between a MIMO transmitter and a MIMO receiver. In another embodiment, the weights are selected such that the signal strength of each weighted signal transmitted through a communications channel along a respective signal path is substantially equivalent, but for which the weighting vectors are not necessarily orthogonal. In a further embodiment, each transmitted signal is coupled only between its own transmitter and receiver antennas with a gain, or eigenvalue, that is a consequence of the weights, and which is bounded to within a desired range of values while at the same time the weighting vectors are orthogonal. Embodiments employing successive decomposition are also provided.

Plain-Language Overview of Independent Claims:

• Claim 1: Describes a MIMO signal transmitter with at least two vector multipliers that weight input signals, and at least two antennas to transmit these weighted signals. The key feature is that the weighting vectors are calculated using a unit magnitude decomposition of the transmission channel matrix. This decomposition results in a unitary matrix with eigenvalues that are essentially on a unit circle in the complex plane, which helps ensure equal signal-to-noise ratios.
• Claim 3: Describes a complete MIMO system, encompassing both a transmitter and a receiver. Similar to Claim 1, it specifies that the transmit vectors used in the transmitter are computed using a unit magnitude decomposition of the transmission channel matrix, leading to eigenvalues that lie substantially on a unit circle of a complex plane.
• Claim 5: Details a multiple-input, multiple-output signal transmitter comprising vector multipliers and combiners. The vector multipliers apply a specific weighting vector of the form R⁻¹V to input signals. Here, R⁻¹ is the inverse of an upper triangular matrix R, where the channel matrix H is represented as the product of a unitary matrix Q and R (H=QR). V comprises the eigenvectors for the unitary matrix Q.
• Claim 7: Describes a multiple-input, multiple-output signal transmission system, including transmit vector multipliers, combiners, and antennas. Similar to Claim 5, the weighting applied to the input signals is a vector of the form R⁻¹V, where R⁻¹ is the inverse of an upper triangular matrix R (derived from H=QR) and V comprises eigenvectors for the unitary matrix Q.
• Claim 9: Covers a receiver in a MIMO system. This receiver has antennas to receive signals and multipliers to weight them with a receive vector. A notable aspect is that the transmit vector (used by the remote transmitter) is specified as being computed by decomposing the transmission channel matrix into a unitary matrix whose eigenvalues lie substantially on a unit circle of a complex plane.
• Claim 11: Describes a receiver with at least two antennas and at least two receive vector multipliers. The antennas receive signals that have already been weighted by a transmit weight vector of the form R⁻¹V. The receive vector multipliers then apply a receive weight vector of the form V⁻¹ to these received signals. As in earlier claims, R⁻¹ is the inverse of an upper triangular matrix R (where H=QR), and V⁻¹ is the inverse of a matrix V that includes eigenvectors for the unitary matrix Q.

Uncertainty Note:
A search for US patent 7738595 in the CAFC 2026 dockets did not yield specific results detailing litigation for this patent number in 2026. General CAFC summaries for 2026 were found, but none directly mention US7738595. The Google Patents record indicates that the "Family has litigation," with cases filed in Texas Eastern District Court and Florida Southern District Court, but does not specifically detail any 2026 CAFC activity for this patent number.