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Decoding method and apparatus

A decoding device and decoding technology, applied in the communication field, can solve the problems of high block error rate and large decoding delay, and achieve the effect of low block error rate and small decoding delay

Inactive Publication Date: 2011-11-16
HUAWEI DEVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a decoding method and device to solve the problems of high block error rate and large decoding delay in existing decoding methods

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  • Decoding method and apparatus

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Embodiment 1

[0015] Such as figure 1 As shown, Embodiment 1 of a USF decoding method provided by the embodiment of the present invention includes:

[0016] Step 101. Obtain the USF local correlation sequence at the receiving end and the USF sequence in the received data.

[0017] Step 102: Correlate the USF local correlation sequence with the USF sequence in the received data to obtain several correlation values.

[0018] Step 103: Use the USF corresponding to the maximum value among the correlation values ​​as the USF decoding result.

Embodiment 2

[0019] figure 2 Shown is the second embodiment of the USF decoding scheme provided by the embodiment of the present invention, including:

[0020] Step 201, perform precoding on the local USF of the receiving end. Generally, there are 8 possible USFs at the receiving end.

[0021] Step 202: Convolutionally encode the precoded sequence, and use the obtained convolutionally coded sequence as a USF local correlation sequence.

[0022] Taking 8 possible USFs as an example, obtain 8 USFs, all of which are 3 bits, ranging from 000 to 111. The 3-bit USF is precoded to obtain bit data of the precoded length. Add 4 bits of "0" as tail bits after the precoded data. Convolutional encoding is performed on the data with tail bits added to obtain (precoding length+4)*2-bit data. Since the function of the tail bits is only to make the convolutional encoder return to the initial state of "0" in the loopback, the convolutional encoding result generated by the tail bits is removed. Final...

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Abstract

The invention embodiment of the invention discloses a decoding method and a device, wherein, a USF coding method comprises the steps that: a USF local correlation sequence of a receiving end and a USF sequence in the received data are obtained; the USF local correlation sequence and the USF sequence in the received data are correlated to obtain a plurality of correlation values; a USF corresponding to the maximum value in the correlation values is taken as the result of the USF decoding. The embodiment of the invention carries out the USF coding through a full correlation method; the block error rate of the obtained USF decoding result is low and the coding delay is small.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular, to a decoding method and device. Background technique [0002] GPRS (General Packet Radio Service, General Packet Radio Service) supports four coding methods of CS (Coding Scheme, coding strategy) 1, CS2, CS3, and CS4. The existing GPRS decoding is de-HlHu, de-interleaving, and de-puncturing After convolutional decoding, the USF (Uplink State Flag) part is extracted to correlate with possible local USF sequences, and the USF corresponding to the maximum correlation value is output. The entire code block, including the data payload and USF, is output after passing through CRC (Cyclic Redundancy Check, Cyclic Redundancy Check). The CS1 code block does not require USF precoding, and the CS4 code block does not require convolutional decoding, which is determined by the block structure of the CS1 and CS4 code blocks. Since CS4 does not require convolutional decoding, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L29/06
CPCH04L1/0045H03M13/09
Inventor 吴更石杨靖彭念黄抒帆周佳晶陈志群
Owner HUAWEI DEVICE CO LTD