US 8,675,570 Scalable OFDM and OFDMA bandwidth allocation in communication systems
5 defendants · 5 suits · updated September 14, 2026
Also cited as U.S. Patent No. 8,675,570 · US8675570B2 · US 8,675,570 B2 · 8675570 · the '570 patent
Velocity Communication Technologies, LLC has filed 5 patent-infringement suits on US 8,675,570, "Scalable OFDM and OFDMA bandwidth allocation in communication systems" 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 March 18, 2014 on a priority date of March 23, 2007. Its abstract opens: "Techniques for bandwidth allocation in communication systems such as OFDM, OFDMA, or SC-FDMA systems to improve spectral efficiency and increase flexibility and adaptability with scalable single or multiple-carrier bandwidth allocation characteristics." The examiner cited 8 references during prosecution.
- Assignee
- Velocity Communication Technologies LLC
- Priority date
- March 23, 2007
- Granted
- March 18, 2014
- Expires
- March 23, 2027
- Status
- Active
- Claims
- 16 (3 independent)
- Inventors
- Sean Cai
- 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 for allocating spectral bandwidth for an Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), or Single Carrier Frequency-Division Multiple Access(SC-FDMA) system, comprising dividing available spectral bandwidth into a channel raster and a plurality of nominal channels, each channel for carrying an independent OFDM or OFDMA or SC-FDM signal and each channel having a corresponding nominal channel bandwidth; choosing a common subcarrier spacing of orthogonal subcarriers that divides the multiple nominal channel bandwidths and the channel raster evenly; and allocating multiple carriers to be one next to another as a group in the same frequency band with reduced guard bands or without guard bands in between, wherein a common subcarrier spacing of orthogonal subcarriers is aligned in frequency between boundaries of adjacent carriers to reduce or eliminate inter-carrier interference; wherein the common subcarrier spacing can evenly divide each of multiple of different channel raster frequencies of one or more frequency bands.
9. A method for allocating spectral bandwidth for an Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA) system, or Single Carrier Frequency-Division Multiple Access(SC-FDMA), comprising: dividing a frequency band into a plurality of channels with nominal channel bandwidths; dividing each channel into a plurality of subchannels each comprising a plurality of subcarriers separated by a common subcarrier spacing, wherein the common subcarrier spacing is aligned in frequency between boundaries of adjacent carriers to reduce or eliminate inter-carrier interference, and wherein the common subcarrier spacing can evenly divide each of multiple of different channel raster frequencies of one or more frequency bands; and selecting the nominal channel bandwidths so that each nominal channel bandwidth is evenly divided into a plurality of subchannels; and using one or more edge subchannels at a spectral end of a channel as guard subchannels without transmitting signals.
16. A method for spectral bandwidth allocation for an Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), or Single Carrier Frequency-Division Multiple Access(SC-FDMA) system, comprising: dividing available spectral bandwidth into a channel raster and a plurality of nominal channels by allocating multiple different nominal channels to be sequentially next to one another in frequency without guard bands in between, wherein each channel carries an independent OFDM or OFDMA or SC-FDM signal; assigning all subcarriers in the multiple different nominal channels to have a common subcarrier spacing, which evenly divides the channel raster, between two adjacent subcarriers and to be aligned across the multiple different nominal channels; selecting a sampling frequency that is equal to or greater than a given nominal channel bandwidth or multiple nominal channel bandwidths; using subcarriers within a given nominal channel bandwidth or multiple channel bandwidths for signal transmission without assigning subcarriers as guard subcarriers at both ends of the nominal channel bandwidth for each of the multiple different nominal channels; wherein the common subcarrier spacing of orthogonal subcarriers is aligned in frequency between boundaries of adjacent carriers to reduce or eliminate inter-carrier interference; and wherein the common subcarrier spacing can evenly divide each of multiple of different channel raster frequencies of one or more frequency bands.
Art before the examiner
13 references of record, 8 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
- US5982327A — Adaptive array method, device, base station and subscriber unit (Motorola, Inc.)
- US20040233838A1 — Ofdm communication method and ofdm communication device (Hiroaki Sudo)
- US20050085236A1 — Method for subcarrier allocation and modulation scheme selection in wireless multicarrier transmission system (Alcatel)
- US20070036066A1 — Method and apparatus for pilot signal transmission (Motorola, Inc.)
- US20070183520A1 — Spectral shaping to reduce peak-to-average ratio in wireless communication (Byoung-Hoon Kim)
- US20070242600A1 — Methods and Apparatus for Multi-Carrier Communications with Variable Channel Bandwidth (Neocific, Inc.)
- US20070258394A1 — Communication Method and Radio Transmitter (Yasuhiro Hamaguchi)
- US20080205351A1 — Subcarrier Spacing Identification (Telefonaktiebolaget L M Ericsson (Publ))
Applicant-cited and other (5)
- US5726978A — Adaptive channel allocation in a frequency division multiplexed system
- EP0869647A2 — System of multicarreir modulation with dynamically scalable operating parameters
- EP1006668A1 — Dual frequency band transceiver
- US6904283B2 — Multi-carrier communications with group-based subcarrier allocation
- US7158475B1 — Transmitting apparatus and method and provision medium
Classification
- H04W72/0453primary — Resources in frequency domain, e.g. a carrier in FDMA
- H04L25/03821 — Inter-carrier interference cancellation [ICI]
- H04L27/2602 — Signal structure
- H04L27/26025 — Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
- H04L27/26035 — Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences
- H04L27/2605 — Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L5/0007 — Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
- H04L5/003 — Arrangements for allocating sub-channels of the transmission path
Family
- US8675570B2 — B2 (2014)
- US20080240275A1 — A1 (2008)
- 14 foreign family members: JP2010522500A, EP2140592A4, CN101730981A, KR101474581B1, WO2008118429A1, CN101136894B, JP2015136163A, CN101730981B, CA2681736A1, KR20100015835A, JP6014190B2, EP2140592A1, CN101136894A, BRPI0809259A2
Abstract
Techniques for bandwidth allocation in communication systems such as OFDM, OFDMA, or SC-FDMA systems to improve spectral efficiency and increase flexibility and adaptability with scalable single or multiple-carrier bandwidth allocation characteristics.
Also asserted by Velocity Communication Technologies, LLC
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- US 9,444,577 — Calibration correction for implicit beamformer using an explicit beamforming technique in a wireless MIMO communication system (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.