Method and system for reduction of decoding complexity in a communication system
First Claim
1. An encoding method for reducing decoding complexity, the method comprising:
- encoding systematic bits of a bit stream in each of a plurality of buffers with a first code, the first code being encoded by an outer encoder;
multiplexing content of the systematic encoded bits in each of the plurality of buffers from the bit stream; and
encoding said multiplexed content with a second code to provide a set of frames, wherein the encoding said multiplexed content comprises identifying a block of bits to be encoded and then coding the block of bits with the second code, the second code being encoded by an inner encoder.
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Abstract
Method and System for Utilization of an Outer Decoder in a Broadcast Services Communication System is described. Information to be transmitted is provided to a systematic portion of a plurality of transmit buffers and encoded by an outer decoder communicatively coupled to the transmit buffer. The resulting redundant bits are provided to a parity portion of each transmit buffer. The content of the transmit buffers, is multiplexed and encoded by an inner decoder to improve protection by adding redundancy. The receiving station recovers the transmitted information by an inverse process. Because a decoding complexity depends on the size of a systematic portion of the transmit buffer, reasoned compromise between a systematic portion size and number of transmit buffers yields decreased decoding complexity.
57 Citations
46 Claims
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1. An encoding method for reducing decoding complexity, the method comprising:
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encoding systematic bits of a bit stream in each of a plurality of buffers with a first code, the first code being encoded by an outer encoder; multiplexing content of the systematic encoded bits in each of the plurality of buffers from the bit stream; and encoding said multiplexed content with a second code to provide a set of frames, wherein the encoding said multiplexed content comprises identifying a block of bits to be encoded and then coding the block of bits with the second code, the second code being encoded by an inner encoder. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method reducing decoding complexity, comprising:
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decoding received frames by a first decoder; de-multiplexing correctly decoded frame to a plurality of buffers, wherein the de-multiplexing comprises identifying a block of bits comprising the correctly decoded frame decoded by the first decoder and belonging to at least one of the plurality of buffers, and further providing the block of bits to at least one of the plurality of buffers; processing content of each of the plurality of buffers into a bit stream; and providing indication of an erasure to a second decoder communicatively coupled to at least one of the plurality of buffers that would receive the correctly decoded frame if the frame failed to decode correctly. - View Dependent Claims (8, 9)
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10. A method for reducing decoding complexity, comprising:
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encoding systematic bits of a bit stream in each of a plurality of transmit buffers with a first code, the first code being an outer code; multiplexing content of the plurality of transmit buffers from the bit stream; encoding said multiplexed content with a second code to provide a set of frames wherein said encoding said multiplexed content comprises identifying a block of bits to be encoded then coding the block of bits with the second code, the second code being an inner code; transmitting the set of frames; decoding received frames by a first decoder; de-multiplexing correctly decoded frame to a plurality of receive buffers; and processing content of each received buffer. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for reducing decoding complexity, comprising:
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a plurality of buffers;
a plurality of outer encoders, each of said plurality of encoders directly coupled to one of said plurality of buffers wherein said plurality of buffers are configured to receive systematic bits from a bit stream;a multiplexer directly coupled to said plurality of buffers; and
an inner encoder directly coupled to said multiplexer, wherein the inner encoder is configured to identify a block of bits encoded by the outer encoders and encode the block of bits with an inner code. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. An apparatus for reducing decoding complexity, comprising:
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a first decoder, wherein said first decoder is configured to; decode a received frame; provide a correctly decoded frame; and provide indication of an erasure if the received frame failed to decode correctly; a de-multiplexer communicatively coupled to said first decoder; a plurality of buffers communicatively coupled to said de-multiplexer; and a plurality of decoders, each of said plurality of decoders being communicatively coupled to one of said plurality of buffers each being communicatively coupled to form a bit stream. - View Dependent Claims (30, 31, 32, 33)
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34. An apparatus for reducing decoding complexity, comprising:
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a plurality of transmit buffers; a plurality of outer encoders, each of said plurality of encoders being communicatively coupled to one of said plurality of transmit buffers wherein said plurality of transmit buffers are configured to receive systematic bits from a bit stream; a multiplexer communicatively coupled to said plurality of transmit buffers; an inner encoder communicatively coupled to said multiplexer, wherein the inner encoder is configured to identify a block of bits to be encoded and to encode the block of bits with an inner code; a first decoder; a de-multiplexer communicatively coupled to said first decoder; a plurality of receive buffers communicatively coupled to said de-multiplexer; and a plurality of decoders, each of said plurality of decoders being communicatively coupled to one of said plurality of receive buffers. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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Specification