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DirectBand
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=== Forward acting error correction === Since many DirectBand uses were mobile, and there was no opportunity to request retransmission of a broadcast signal, DirectBand utilized an advanced error-correction strategy that allowed for reconstruction of messages even when sizable portions of the message were lost due to buildings, tunnels or other obstructions of the FM signal. Error correction was 1/2 rate interleaved [[Trellis modulation|trellis]] with time diversity, soft-decision decode. The DirectBand data rate was in excess of 12 kbit/s after ECC.
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