Bit interleaving for orthogonal frequency division multiplexing in the transmission of digital signals
US6717908B2 · kind B2 · utility
133Cited by
21References
32Claims
0Family size
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Key dates
| Filing date | May 10, 2001 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | May 10, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/2383
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an orthogonal frequency division multiplexing (OFDM) system which uses an outer Reed-Solomon encoder and interleaver an inner convolutional encoder, after the inner convolutional encoding the data bits are interleaved, and then grouped into symbols, each symbol having “m” bits. After grouping, the symbols are mapped to a complex plane using quadrature amplitude modulation (QAM). Thus, bits, not symbols, are interleaved by the inner interleaver. A receiver performs a soft decision regarding the value of each bit in each complex QAM symbol received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.