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Data diversity combination method and system in repeated encoding system

A technology of repetitive coding and data, applied in the field of data diversity combining methods and systems, can solve the problems of inaccurate weights of MRC combining, reducing the quality of received signals, and channel attenuation of diversity data blocks, so as to improve the signal demodulation capability, improve the Channel fading and noise interference, the effect of increasing the suppression effect

Active Publication Date: 2017-05-31
CHONGQING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

[0014] Second: When the channel quality is poor, many diversity data blocks have been severely attenuated by the channel. Using EGC or MRC methods for these diversity blocks will reduce the quality of the received signal;
[0015] Third: At the receiving end in the OFDM system, in order to reduce the peak-to-average ratio, automatic gain control (AGC) technology is sometimes used, so it is inaccurate to use the signal-to-noise ratio as the weight of MRC combination

Method used

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  • Data diversity combination method and system in repeated encoding system
  • Data diversity combination method and system in repeated encoding system
  • Data diversity combination method and system in repeated encoding system

Examples

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Embodiment 1

[0069] In the PLC system, two frequency bands are supported, namely frequency band 0 and frequency band 1 . Frequency band 0 has a total of 512 subcarriers, numbered from 0 to 511, and the maximum number of available subcarriers supported is 411, numbered from 80 to 490, all of which are used without shielding one or several subcarriers in the middle; supported by frequency band 1 There are 131 sub-carriers, numbered from 100 to 230, all of which are used, and one or several sub-carriers in the middle are not shielded. like Figure 6 Shown is a physical layer link processing process of a PLC system. In this system, the processing is divided into two parts: frame control and load data. Among them, the frame control part adopts a fixed diversity copy mode according to the used frequency band (0 or 1) when transmitting data each time, while the diversity copy mode of the load data part can be changed according to the current channel quality. Diversity copy parameters will be gi...

Embodiment 2

[0106] Next, take the physical layer diversity copy process of the payload data part of frequency band 1 and TMI=1 as an example. The specific steps are as follows, and the process is as follows: Figure 7 shown.

[0107] Step 1: The system sets the communication frequency band to be frequency band 1, and the transmitting end sets the diversity copy mode of the payload part to TMI=1, and puts the TMI value into the frame control part. The frame control part adopts QPSK modulation, 12 OFDM symbols.

[0108] Step 2: The payload data is processed by scrambling, Turbo coding, and channel interleaving according to this, and then input to the diversity copy module. According to TMI = 1, support PB520, the number is 1 to 4 physical blocks, and the physical block is used as the unit for processing in each module. 520Byte×8=4160bit, after Turbo coding with a code rate of 1 / 2, the number of bits of a single physical block entering the diversity copy is DataBitsLen=4160bit×2=8320bit. ...

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Abstract

The invention relates to a data diversity combination method and system in a repeated encoding system, and belongs to the technical field of broadband electric power carrier communication. The data diversity combination method provided by the invention comprises the following steps: after finishing sub-carrier mapping of data at a transmitting terminal, filling an empty sub-carrier position with a reference signal sequence; sending into an electric power line channel and transmitting; judging channel quality of a current OFDM (Orthogonal Frequency Division Multiplexing) symbol at a receiving terminal according to signal quality of the reference signal sequence, so as to determine a diversity combined data block and a weight coefficient thereof; carrying out diversity data combination. The invention further provides the data diversity combination system corresponding to the data diversity combination method. According to the data diversity combination method and system in the repeated encoding system, provided by the invention, the aim of improving the channel fading resistance of a received signal and noise interference can be realized; an empty sub-carrier in a PLC (Programmable Logic Controller) system is sufficiently used for transmitting resources, so that the signal demodulation capability of the receiving terminal is improved, and the inhibition effect, on random pulse noise interference, of the system is increased.

Description

technical field [0001] The invention relates to the technical field of broadband power carrier communication, in particular to a data diversity combination method and system in a repetition coding system. Background technique [0002] In the communication system, after the useful information is transmitted through the channel, due to the attenuation characteristics of the channel and the influence of various noise interference, the observation signal with a certain difference from the original signal will be obtained at the receiving end. Then, how to reasonably process these observation data so as to reduce the bit error rate of the useful information finally obtained as much as possible has always been an important research direction in the field of communication. Therefore, in order to improve the reliability of information transmission in communication systems, anti-fading technologies from different research fields are used in the process of information block processing...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L1/20H04B3/54
CPCH04B3/542H04L1/203H04L5/0007H04L5/0048
Inventor 段红光李玲欣郑建宏林毅
Owner CHONGQING UNIV OF POSTS & TELECOMM
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