Transmission and reception of reference preamble signals in ofdma or ofdm communication systems
CA 2575317 C · Owner: Yang, Yunsong · Inventors: Fang, Yonggang; Feng, Dazi; Cai, Sean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Techniques for generating preamble sequences for OFDM and OFDMA communication systems based on CAZAC sequences (120) with desired properties of constant amplitudes (CA) and zero autocorrelation (ZAC). Such preamble sequences may be used for synchronization and identification of individual transmitters. For example the OFDMA symbol is constructed using a CAZAC sequence in the frequency-domain (160) and the resulting time-domain waveform is a near-CAZAC sequence (170).
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed July 27, 2005 and granted December 11, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 27, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
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Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.