# Convolutional Codes

Xem 1-20 trên 33 kết quả Convolutional Codes
• ### Convolutional Coding

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) ?

• ### Principles of Communications Convolutional codes

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

• ### Modulation and coding course- lecture 12

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?

• ### Digital Communications 1: Modulation and Coding Course

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.

• ### Modulation and coding course- lecture 11

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

• ### Introducing Low-Density Parity-Check Codes

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.

• ### Modulation and coding course- lecture 10

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

• ### Digital Communication I: Modulation and Coding Course-Lecture 13

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.

• ### Báo cáo hóa học: " FPGA Prototyping of RNN Decoder for Convolutional Codes"

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

• ### Digital Communication I: Modulation and Coding Course-Lecture 10

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.

• ### Digital Communication I: Modulation and Coding Course-Lecture 11

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?

• ### Digital Communication I: Modulation and Coding Course-Lecture 12

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.

• ### Báo cáo hóa học: " Research Article Space-Time Convolutional Codes over Finite Fields and Rings for Systems with Large Diversity Order"

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

• ### Báo cáo hóa học: " Research Article Decoding LDPC Convolutional Codes on Markov Channels"

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

• ### Báo cáo hóa học: "Research Article Generalized Punctured Convolutional Codes with Unequal Error Protection"

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

• ### Báo cáo hóa học: "A Systematic Approach to Modiﬁed BCJR MAP Algorithms for Convolutional Codes"

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

• ### Bài tập điều kiện môn Kỹ thuật truyền số liệu

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

• ### BÀI 4: MÃ HÓA KÊNH

• Tín hiệu truyền qua kênh truyền sẽ bị ảnh hưởng bởi nhiễu, can nhiễu, fading… là tín hiệu đầu thu bị sai. • Mã hóa kênh: dùng để bảo vệ dữ liệu không bị sai bằng cách thêm vào các bit dư thừa (redundancy). • Ý tưởng mã hóa kênh là gởi một chuỗi bit có khả năng sửa lỗi • Mã hóa kênh không làm giảm lỗi bit truyền mà chỉ làm giảm lỗi bit dữ liệu (bảng tin) • Có hai loại mã hóa kênh cơ bản là: Block codes và Convolutional codes...

• ### SIGNAL PROCESSING & SIMULATION NEWSLETTER

Coding and decoding with Convolutional Codes Convolutional codes are commonly specified by three parameters; n,k, ). ( m n= number of output bits k= number of input m= number of memory bits registers The k/