{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8509352","patent":{"patent_number":"US-8509352","title":"Integer spreading rotation matrices for QAM constellations and its decode-remodulate-forward cooperative communication strategy","assignee":null,"inventors":[],"filing_date":"2006-12-08T00:00:00.000Z","publication_date":"2013-08-13T00:00:00.000Z","cpc_codes":["H04B","H04B","H04B","H04L","H04L","H04L"],"num_claims":24,"abstract":"Diversity techniques are commonly used in wireless communications to combat multipath fading. Recent interests in ultra-wideband technology focus on multi-band OFDM systems that can explore the high diversity due to the independent frequency bands. To achieve full diversity with high data rate, a system, apparatus and method that uses coded modulation with spreading rotation of transmitted signals. A 2×2 integer rotation matrix for QAM signals, 3×3 and 4×4 integer rotation matrices for QAM signals are provided. Compared with the non-regular QAM shape for real rotation matrices, each of these integer rotation matrices makes the regular QAM shape after rotation."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Integer spreading rotation matrices for QAM constellations and its decode-remodulate-forward cooperative communication strategy","description":"Diversity techniques are commonly used in wireless communications to combat multipath fading. Recent interests in ultra-wideband technology focus on multi-band OFDM systems that can explore the high d","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8509352","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8509352","citation_suggestion":"Patentable. \"Integer spreading rotation matrices for QAM constellations and its decode-remodulate-forward cooperative communication strategy\" (US-8509352). https://patentable.app/patents/US-8509352","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8509352","json":"https://patentable.app/api/llm-context/US-8509352","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T16:08:25.522Z"}