Convolutional coding

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  • Today, we are going to talk about: Another class of linear codes, known as Convolutional codes. Structures of the encoder and different ways for representing it.: state diagram and trellis representation of the code. What is a Maximum likelihood decoder? How the decoding is performed for Convolutional codes (the Viterbi algorithm) ?

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  • In block coding, the encoder accepts kbit message block and generates n-bit codeword⇒Block-by-block basis  Encoder must buffer an entire message 2 block before generating the codeword  When the message bits come in serially rather than in large blocks, using buffer is undesirable  Convolutional coding

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  • How the decoding is performed for Convolutional codes? -What is a Maximum likelihood decoder? -What are the soft decisions and hard decisions? -How does the Viterbi algorithm work?

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  • The two fundamental building blocks of a digital communication system are modulation and channel coding. They enable reliable communication by providing signaling schemes and receiver structures that utilize the available spectrum and power efficiently.

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  • Another class of linear codes, known as Convolutional codes. -We studied the structure of the encoder and different ways for representing it.

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  • Another class of linear codes, known as Convolutional codes. -We study the structure of the encoder. -We study different ways for representing the encoder.

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  • The properties of Convolutional codes. We introduced interleaving as a means to combat bursty errors by making the channel seem uncorrelated. We also studied “Concatenated codes” that simply consist of inner and outer codes. They can provide the required performance at a lower complexity.

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  • Low-density parity-check (LDPC) codes are forward error-correction codes, first proposed in the 1962 PhD thesis of Gallager at MIT. At the time, their incredible potential remained undiscovered due to the computational demands of simulation in an era when vacumm tubes were only just being replaced by the first transistors. They remained largely neglected for over 35 years. In the mean time the field of forward error correction was dominated by highly structured algebraic block and convolutional codes.

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  • Another class of linear codes, known as Convolutional codes. We study the structure of the encoder. We study different ways for representing the encoder.Convolutional codes offer an approach to error control coding substantially different from that of block codes. A convolutional encoder: encodes the entire data stream, into a single codeword. does not need to segment the data stream into blocks of fixed size (Convolutional codes are often forced to block structure by periodic truncation). is a machine with memory.

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  • Another class of linear codes, known as Convolutional codes. We studied the structure of the encoder and different ways for representing it.What are the state diagram and trellis representation of the code? How the decoding is performed for Convolutional codes? What is a Maximum likelihood decoder? What are the soft decisions and hard decisions? How does the Viterbi algorithm work?

    ppt28p doanhung_dtvtk10 24-03-2013 27 4   Download

  • How decoding is performed for Convolutional codes? What is a Maximum likelihood decoder? What are soft decisions and hard decisions? How does the Viterbi algorithm work?The demodulator makes a firm or hard decision whether one or zero was transmitted and provides no other information for the decoder such as how reliable the decision is.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: FPGA Prototyping of RNN Decoder for Convolutional Codes

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Space-Time Convolutional Codes over Finite Fields and Rings for Systems with Large Diversity Order

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Decoding LDPC Convolutional Codes on Markov Channels

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Generalized Punctured Convolutional Codes with Unequal Error Protection

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A Systematic Approach to Modified BCJR MAP Algorithms for Convolutional Codes

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  • Tìm hiểu phương pháp phát hiện và sửa lỗi theo Convolutional Coding và Viterbi Decoding. Mời các bạn cùng tham khảo tài liệu.

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