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Unequal error protection method based on self-adaptive symbol carrier allocation

A technology of carrier allocation and error protection, applied in the field of digital information transmission, to achieve the effects of improving overall performance, improving decoding performance, and reducing costs

Active Publication Date: 2012-09-26
SPACE STAR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem of the present invention is to overcome the deficiencies of the prior art and provide a real-time, high-performance, low-complexity unequal error protection method based on adaptive symbol carrier allocation for MIMO-OFDM systems with LDPC codes

Method used

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  • Unequal error protection method based on self-adaptive symbol carrier allocation
  • Unequal error protection method based on self-adaptive symbol carrier allocation
  • Unequal error protection method based on self-adaptive symbol carrier allocation

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Embodiment

[0068] The block diagram of the simulated system is as figure 1 As shown, the NB-LDPC code used is defined in the finite field GF(2 p ) (p is equal to 4 and 6 respectively), the length N of each data symbol is 384, and the modulation method is 2 4 QAM and 2 6 QAM. The channel model used in the simulation is an 11-path Rayleigh fading channel, and the power delay distribution is exponentially attenuated. The number of transmitting antenna lines is fixed at 2, and the number of receiving antennas is n R Take 1 and 2 respectively. The bit error performance of the system is compared between the unused symbol carrier allocation algorithm and the adaptive symbol carrier allocation algorithm. Figure 4 gives the use of GF(2 4 ) NB-LDPC code encoding, 2 4 Under QAM modulation, the bit error performance of the system is compared when the symbol carrier allocation algorithm is not used and the adaptive symbol carrier allocation algorithm is used. The results show that the perfo...

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Abstract

The invention relates to an unequal error protection method based on self-adaptive symbol carrier allocation. According to the characteristics of the multi-path fading channel and the node degrees of different variables, the self-adaptive symbol carrier allocation method can self-adaptively modulate each symbol in code words onto OFDM sub-carriers of different kinds of fading, modulate data symbols in NB-LDPC code words corresponding large column degrees of a check matrix H onto corresponding OFDM sub-carriers with small channel fading, and modulate data symbols in NB-LDPC code words corresponding small column degrees of a check matrix H onto corresponding OFDM sub-carriers with large channel fading, thereby realizing unequal error protection for symbols with different decoding weights, optimizing all the initialized soft information into the decoder, and improving the decoding performance. The method of the invention has the advantages of simple implementation, real-time processing and capability of solving the problem of high complexity of implementation due to the frequent power adjustment.

Description

technical field [0001] The invention belongs to the field of digital information transmission, and relates to a method for performing unequal error protection by performing adaptive symbol carrier allocation in a MIMO-OFDM system using NB-LDPC code concatenated STBC. Background technique [0002] Multi-ary low density parity check (NB-LDPC, Non-binary Low Density ParityCheck) code is a kind of linear block code, which can be expressed by generator matrix G and parity check matrix H, and coded modulation combined with modulation Among them, NB-LDPC codes have better performance than binary LDPC codes. The number of non-zero elements in H is far less than the number of zero elements, and the value of its non-zero elements is selected from the GF field (finite field), and the size of the GF field is 2 p (p > 1), figure 2 gives a field size of 2 p (p=2) NB-LDPC check matrix and degree schematic diagram, the number of non-zero elements in each column of the check matrix H i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/34H04L1/06H04L1/00
Inventor 陈昕尤启迪李申阳邹光南
Owner SPACE STAR TECH CO LTD