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| 供应商 | Noesis Technologies |
|---|---|
| 型号 | Configurable Viterbi Decoder |
| 类型 | Soft IP |
| 到期日 | Silicon proven |
| 源网址 | View more |
| 特征 | Support for zero-tail and tail-biting Viterbi decoding algorithms Configurable constraint length Configurable trace-back depth Configurable code rate and soft bits Continuous or gapped input data streams Fully parallel or resource based architectures for different gate count/speed combinations Low decoder latency Fully synchronous design using a single clock |
| 详情页 | View more |
| 附件名称 | ntVIT_pb.pdf |
| 附件链接 | View more |
Convolutional FEC codes are very popular because of their powerful error correction capability and are especially suited for correcting random errors. The most effective decoding method for these codes is the soft decision Viterbi algorithm.
ntVIT core is a high performance, fully configurable convolutional FEC core, comprised of a 1/N convolutional encoder, a variable code rate
puncturer/depuncturer and a soft input Viterbi decoder. Depending on the application, the core can be configured for specific code parameters
requirements. The highly configurable architecture makes it ideal for a wide range of applications.
The convolutional encoder maps 1 input bit to N encoded bits, to generate a rate 1/N encoded bitstream. A puncturer can be optionally used to derive higher code rates from the 1/N mother code rate. On the encoder side, the puncturer deletes certain number of bits in the encoded data stream
according to a user defined puncturing pattern which indicates the deleting bit positions. On the decoder side, the depuncturer inserts a-priori-known data at the positions and flags to the Viterbi decoder these bits positions as erasures.
The Viterbi decoder uses a maximum-likelihood detection recursive process to correct errors in the data stream. The Viterbi input data stream can be composed of hard or soft bits. Soft decision achieves a 2 to 3dB increase in coding gain over hard-decision decoding. Data can be received continuously or with gaps.
ntVIT core is a high performance, fully configurable convolutional FEC core, comprised of a 1/N convolutional encoder, a variable code rate
puncturer/depuncturer and a soft input Viterbi decoder. Depending on the application, the core can be configured for specific code parameters
requirements. The highly configurable architecture makes it ideal for a wide range of applications.
The convolutional encoder maps 1 input bit to N encoded bits, to generate a rate 1/N encoded bitstream. A puncturer can be optionally used to derive higher code rates from the 1/N mother code rate. On the encoder side, the puncturer deletes certain number of bits in the encoded data stream
according to a user defined puncturing pattern which indicates the deleting bit positions. On the decoder side, the depuncturer inserts a-priori-known data at the positions and flags to the Viterbi decoder these bits positions as erasures.
The Viterbi decoder uses a maximum-likelihood detection recursive process to correct errors in the data stream. The Viterbi input data stream can be composed of hard or soft bits. Soft decision achieves a 2 to 3dB increase in coding gain over hard-decision decoding. Data can be received continuously or with gaps.
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