US 8,644,765 Beamforming using predefined spatial mapping matrices
5 defendants · 5 suits · updated September 14, 2026
Also cited as U.S. Patent No. 8,644,765 · US8644765B1 · US 8,644,765 B1 · 8644765 · the '765 patent
Velocity Communication Technologies, LLC has filed 5 patent-infringement suits on US 8,644,765, "Beamforming using predefined spatial mapping matrices" since July 30, 2026, 3 of them in the E.D. Tex., against 5 distinct defendants including Arcadyan Technology Corporation, Calix, Inc. and Sercomm Corporation. The patent was granted February 4, 2014 on a priority date of October 15, 2007. Its abstract opens: "In one or more aspects data packets are iteratively transmitted to a receiver using predefined spatial mapping matrices, channel estimates are received from the receiver responsive to the iteratively transmitted data packets, and one of the predefined spatial…" The examiner cited 6 references during prosecution.
- Assignee
- Velocity Communication Technologies LLC
- Priority date
- October 15, 2007
- Granted
- February 4, 2014
- Expires
- October 15, 2027
- Status
- Active
- Claims
- 20 (3 independent)
- Inventors
- Hongyuan Zhang, Rohit U Nabar
- Full text
- Google Patents
The suits
5 cases · E.D. Tex. (3) · D. Del. (2)
| Filed | Defendant | Plaintiff | Court | Docket |
|---|---|---|---|---|
| 2026-07-30 | Arcadyan Technology Corporation | Velocity Communication Technologies, LLC | E.D. Tex. | 5:26-cv-00102 |
| 2026-07-30 | Calix, Inc. | Velocity Communication Technologies, LLC | D. Del. | 1:26-cv-00937 |
| 2026-07-30 | Sercomm Corporation | Velocity Communication Technologies, LLC | E.D. Tex. | 5:26-cv-00101 |
| 2026-07-30 | TCL Electronics Holdings Limited | Velocity Communication Technologies, LLC | E.D. Tex. | 5:26-cv-00103 |
| 2026-07-30 | Vistance Networks, Inc. | Velocity Communication Technologies, LLC | D. Del. | 1:26-cv-00944 |
Docket links open the public record on CourtListener. Filing dates are the complaint's.
Independent claims
What is actually asserted, verbatim.
1. A method comprising: storing, in a memory, predefined spatial mapping matrices useful for transmitting data packets to a receiver; iteratively transmitting one or more of the data packets to the receiver, each act of transmitting using a different one of the predefined spatial mapping matrices stored in the memory; receiving, from the receiver, channel estimates responsive to iteratively transmitting the one or more data packets; selecting, based on the received channel estimates, one of the predefined spatial mapping matrices stored in the memory for use in transmitting one or more additional data packets to the receiver; and selecting another one of the predefined spatial mapping matrices when a packet error rate associated with the one or more additional data packets transmitted to the receiver exceeds a defined error rate threshold.
8. One or more computer-readable memory devices storing executable instructions, that when executed, implement a communication controller configured to: iteratively transmit one or more data packets to a receiver, each act of transmitting using a different one of a set of predefined spatial mapping matrices; receive, from the receiver, channel estimates responsive to the one or more data packets iteratively transmitted to the receiver; select, based on the received channel estimates, one of the predefined spatial mapping matrices from the set of predefined spatial mapping matrices for use in transmitting one or more additional data packets to the receiver; and select another one of the predefined spatial mapping matrices when a packet error rate associated with the one or more additional data packets transmitted to the receiver exceeds a defined error rate threshold.
15. An apparatus comprising: one or more antennas configured for directional transmissions; memory configured to maintain a codebook having predefined spatial mapping matrices useful for beamforming; and a transmission controller configured to: iteratively transmit via the one or more antennas data packets in different directions using the predefined spatial mapping matrices; receive channel estimates from a receiver responsive to one or more of the data packets iteratively transmitted to the receiver, and; select, based on the received channel estimates, one of the predefined spatial mapping matrices for communicating one or more additional data packets with the receiver via the one or more antennas; select another one of the predefined spatial mapping matrices when a packet error rate associated with the one or more additional data packets transmitted to the receiver exceeds a defined error rate threshold.
Art before the examiner
27 references of record, 6 cited by the examiner.
Everything listed here was before the Office and is what a challenge must go beyond. Art the examiner never saw is where an invalidity search starts.
Examiner-cited
- US20050063378A1 — Incremental redundancy transmission for multiple parallel channels in a MIMO communication system (Tamer Kadous)
- US20060190245A1 — System for generating a wideband signal from a received narrowband signal (Bernd Iser)
- US20070049218A1 — Precoding and SDMA support (Qualcomm Incorporated)
- US20070189148A1 — Signal transmitting method (variants) and device for carrying out said method (Garmonov Alexandr V)
- US20070206504A1 — Method and apparatus for calibration and channel state feedback to support transmit beamforming in a mimo system (Interdigital Technology Corporation)
- US20070253501A1 — Wireless communication system, wireless communication apparatus and wireless communication method (Sony Corporation)
Applicant-cited and other (21)
- WO2001029986A1 — Optimising link quality by space and time interleaving
- US20060209980A1 — Beam and power allocation method for MIMO communication system
- WO2006138337A1 — Robust rank prediction for a mimo system
- US20070155336A1 — Apparatus and method for eliminating multi-user interference
- US20070249402A1 — Orthogonal resource reuse with sdma beams
- US20080004076A1 — Base station apparatus and termnal apparatus
- US20080080637A1 — System and method for performing precoding in a wireless communication system
- US20080117867A1 — Techniques to provide physical resource allocation using a tree-based structure and communicate a channel quality indicator
- US20080219373A1 — Codebook selection for transmit beamforming
- US20080292012A1 — Multiple-input multiple-output communication method and multiple-input multiple-output communication system of enabling the method
- US20080299917A1 — Closed-loop multiple-input-multiple-output scheme for wireless communication based on hierarchical feedback
- US20090097395A1 — Beamforming Using Predefined Spatial Mapping Matrices
- US20090129286A1 — Reducing inter-ss interference
- US20090232245A1 — Multi-resolution beamforming based on codebooks in mimo systems
- US20090274230A1 — Progressive Feedback For High Resolution Limited Feedback Wireless Communication
- US20090274225A1 — Multi-resolution precoding codebook
- US20090310586A1 — Cooperative Wireless Networks
- US7746936B2 — Method and device for optimizing codebook for quantized precoder by using steepest descent algorithm
- US7961640B2 — Method and apparatus for codebook exchange in a multiple access wireless communication system
- US7995528B1 — Precoding with multi-user codebooks
- US8462716B1 — Method and apparatus for using multiple codebooks for wireless transmission to a plurality of users in a cell
Classification
- H04B7/0417primary — Feedback systems
- H04B7/0456primary — Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0617 — Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
- H04B7/0626 — Channel coefficients, e.g. channel state information [CSI]
- H04B7/0632 — Channel quality parameters, e.g. channel quality indicator [CQI]
- H04L1/0001 — Systems modifying transmission characteristics according to link quality, e.g. power backoff
Family
- US8644765B1 — B1 (2014)
- US9621240B1 — B1 (2017)
- US8213870B2 — B2 (2012)
- US20170187436A1 — A1 (2017)
- US9083401B2 — B2 (2015)
- US20090097395A1 — A1 (2009)
- US20140146909A1 — A1 (2014)
- US10200096B2 — B2 (2019)
- 2 foreign family members: WO2009051748A3, WO2009051748A2
Abstract
In one or more aspects data packets are iteratively transmitted to a receiver using predefined spatial mapping matrices, channel estimates are received from the receiver responsive to the iteratively transmitted data packets, and one of the predefined spatial mapping matrices is selected for transmitting additional data packets to the receiver based on the received channel estimates.
Also asserted by Velocity Communication Technologies, LLC
- US 10,200,096 — Beamforming using predefined spatial mapping matrices (5 defendants)
- US 8,213,870 — Beamforming using predefined spatial mapping matrices (5 defendants)
- US 8,238,832 — Antenna optimum beam forming for multiple protocol coexistence on a wireless device (5 defendants)
- US 8,260,213 — Method and apparatus to adjust a tunable reactive element (5 defendants)
- US 8,265,573 — Wireless subscriber communication unit and method of power control with back-off therefore (5 defendants)
- US 8,270,343 — Broadcasting of textual and multimedia information (5 defendants)
- US 8,675,570 — Scalable OFDM and OFDMA bandwidth allocation in communication systems (5 defendants)
- US 9,083,401 — Beamforming using predefined spatial mapping matrices (5 defendants)
- US 9,444,577 — Calibration correction for implicit beamformer using an explicit beamforming technique in a wireless MIMO communication system (5 defendants)
- US 9,596,648 — Unified beacon format (5 defendants)
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This page is assembled from public records — federal court dockets and the patent's own file — and is updated as the case list changes. It states what the record shows and is not an opinion on the validity or infringement of any claim. Patent data via Google Patents; docket data via CourtListener.