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Rapid PBCH (physical broadcast channel) decoding method for LTE (long term evolution)

A decoding method and fast technology, which can be used in digital transmission systems, electrical components, error prevention, etc., and can solve problems such as resource consumption and large amount of calculation.

Inactive Publication Date: 2013-01-30
MEDIATEK INC
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Problems solved by technology

[0006] The purpose of the present invention is to provide a fast PBCH decoding method for LTE, to solve the problem of large amount of calculation and resource consumption in the prior art scheme

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  • Rapid PBCH (physical broadcast channel) decoding method for LTE (long term evolution)
  • Rapid PBCH (physical broadcast channel) decoding method for LTE (long term evolution)
  • Rapid PBCH (physical broadcast channel) decoding method for LTE (long term evolution)

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Embodiment Construction

[0042] refer to Figure 5 As shown, the PBCH demodulation and descrambling module stores the log likelihood ratio LLR in the LLR memory, which is denoted as LLR k(k=0, 1, . . . , K-1). Since PBCH can be decoded separately for each radio frame, in the case of normal CP, the value of K may be 480, 960, 1440 or 1920; in the case of extended CP, the value of K may be 432, 864, 1296 or 1728 .

[0043] The PBCH rate matching algorithm uses repetition operations to repeat 120 data before rate matching into 480, 960, 1440 or 1920 (432, 864, 1296 or 1728 in the case of Extended CP) data.

[0044] Therefore, it is only necessary to record the address correspondence of 120 data sub-blocks before and after interleaving, and the location of a certain data after sub-block interleaving and rate matching before sub-block interleaving can be obtained. Table 1 shows the positions of the 120 bits encoded by the tail-biting convolutional code after sub-block interleaving. Among them, the firs...

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Abstract

The invention discloses a rapid PBCH (physical broadcast channel) decoding method for LTE (long term evolution). The rapid PBCH decoding method includes the steps of recording corresponding address relation before and after one hundred and twenty data sub-blocks are interleaved to obtain the position of a to-be-interleaved datum after sub-block interleaving and rate matching and a PBCH deblocked sub-block interleaved corresponding relation table indicating positions of one hundred and twenty bits of an encoded tail biting convolution code after the sub-block interleaving; performing deblocked rate matching and deblocked sub-block interleaving, wherein in the PBCH deblocked sub-block interleaved corresponding relation table, the first column indicates the positions of the first to the eighth encoded bits after the sub-blocking interleaving, the second column indicates the ninth to the sixteenth encoded bits after the sub-blocking interleaving, and so on, and the fifteenth column indicates the one hundred and thirteenth to the one hundred and twentieth encoded bits after the sub-blocking interleaving. The rapid PBCH decoding method for the LTE and a structure for decoding a PBCH of the LTE are simplified, PBCH decoding time on the premise of reaching maximum likelihood decoding performance is shortened, resource consumption for PBCH decoding is saved and realizing complexity is reduced.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to a fast PBCH decoding method suitable for LTE. Background technique [0002] As the next-generation mainstream communication technology, LTE has the characteristics of high transmission rate, high spectrum utilization rate, and simple receiver. LTE is divided into two duplex modes, TDD and FDD. The frame structure of the two modes is as follows figure 1 shown. [0003] The PBCH of LTE carries the Master Information Block (MIB for short) in the LTE system information. The MIB includes the most important and commonly used transmission parameters of the current base station (nodeB), such as system bandwidth, PHICH configuration, and system frame number (SFN). The MIB has a total of 24 bits, of which 14 bits are used to represent system information, and the other 10 bits are spare bits, whose value is 0. figure 2 Indicates the PBCH code multiplexing and mapping proc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
Inventor SHAN MINGZHU XUANCHENG
Owner MEDIATEK INC
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