Bit interleaving for orthogonal frequency division multiplexing in the transmission of digital signals
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United States of America Patent
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Nov 21, 2000
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app pub date -
Jun 19, 1997
filing date -
Jun 19, 1997
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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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