Viterbi coding method

A Viterbi decoding and decoding technology, applied in other decoding technologies, digital transmission systems, electrical components, etc., can solve problems such as large delay, reduce complexity, improve reliability, and increase the amount of information.

Inactive Publication Date: 2012-09-12
SICHUAN PANOVASIC TECH
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Problems solved by technology

In low-speed decoding, these operations can be completed serially, but the delay is large

Method used

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Embodiment

[0036] For the encoder used by DAB with a limit length of 3, the encoder's memory has 4 states, that is, the 2 states represented by its 2-bit register. 2 state. The corresponding Viterbi decoder is to determine the probability that each of these states transfers to a set of 4 encoder possible states after receiving the transmitted sequence, such as Figure 4 Shown: For each state, it is possible to turn to one of its two possible subsequent states (the current state is S0, and it may turn to S0 or S2 in the next state; the current state is S1, and it may turn to S0 or S2 in the next state ; the current state is S2, it may turn to S1 or S3 in the next state; the current state is S3, it may turn to S1 or S3 in the next state), each transition corresponds to the latest input bit in the convolutional encoder shift register , the bit is 0 corresponding to a state, or 1 corresponding to a state, such as Figure 4 As shown, the state S0 turns to S0 in the next state and the corres...

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Abstract

The invention relates to a decoding technology, particularly to a Viterbi decoding method used in the digital audio and video broadcasting system adopting an OFDM (orthogonal frequency division multiplexing) communication method. The Viterbi decoding method of the invention can reduce the complexity by reducing a survivor path with low likelihood. The Viterbi decoding method comprises the steps of: a. the quantity of original states are set; b. status measurement is calculated according to the value of CSI, and the value of CSI is used as the sum of corresponding Euclidean distance of the present-moment states of the weighting coefficient; c. the quantity of hold states is confirmed according to the values of CSI, and bigger value of CSI leads to less quantity of hold states; d. branchingmeasurement is calculated; e. the corresponding branching measurements of the hold states are calculated, and path selection is conducted according to the branching measurements; f. that whether the decoding process is finished or not is judged, wherein, the coding is output when finished, and the step b is reduced when the decoding process is not finished. The Viterbi decoding method of the invention can reduce the complexity of the Viterbi decoding process and the possibility of overflow of a stored buffer.

Description

technical field [0001] The invention relates to decoding technology, in particular to Viterbi decoding in a digital audio and video broadcasting system using OFDM (orthogonal frequency division multiplexing) communication. Background technique [0002] Traditional AM and FM analog broadcasts lack resistance to multi-path interference, resulting in a decline in the quality of received audio programs; while digital audio broadcasting (DAB) has superior high-speed mobile reception capabilities and signal quality, and the single frequency network technology used can Let the listener use the same frequency to listen between different signal blocks, and can receive multimedia information other than audio. It is the third generation of broadcasting after FM and AM broadcasting. [0003] The DAB receiver is divided into four parts: IF front end, baseband digital processing, audio decoding and control. Baseband digital processing performs integral processing of DAB data. The DAB d...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M13/41H04L1/00
Inventor 杨璐
Owner SICHUAN PANOVASIC TECH
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