Bit interleaving for orthogonal frequency division multiplexing in the transmission of digital signals
US6151296A · kind A · utility
81Cited by
6References
10Claims
0Family size
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Key dates
| Filing date | Jun 19, 1997 |
| Grant date | Nov 21, 2000 |
| Priority date | — |
| Expiry date | Jun 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4382
- 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.
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