Scalable QAM system and method
US7471640B2 · kind B2 · utility
7Cited by
10References
14Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 31, 2003 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Oct 17, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/004
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A scalable QAM system and communication method. High-level QAM signals are broadcast from a transmitter. The transmitter comprises a scalable frame structure in a MAC layer and a bitmap method in a physical layer transmitting modulated signals with data distributed in different bit positions. Each client determines whether to demodulate all the received data on the bit plane or only a portion of the data in certain bit positions according to the transmission quality (SNR) of the received signal, in order to acquire a lower bit error rate and improve the efficiency of the transmission bandwidth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.