A polar code hybrid automatic repeat request method based on unequal error protection characteristics of high-order modulation
A technology of hybrid automatic retransmission and high-order modulation, which is applied in the direction of transmission modification based on link quality, adjustment of channel coding, adjustment of transmission rate, etc., can solve the problems of inflexibility and low throughput, and achieve the effect of overall system flexibility
Active Publication Date: 2020-04-24
BEIHANG UNIV
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[0007] The present invention aims at the disadvantages of low throughput and inflexibility of the existing polar code hybrid automatic repeat request technology; by designing the binary information bits contained in each retransmission sequence and the mapping relationship between these information bits and high-order symbols, A polar code hybrid automatic repeat request method based on the unequal error protection characteristic of high-order modulation is proposed
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[0096] In this embodiment, the mapping used is 4-PAM modulation, and each modulation symbol contains m=2 equivalent binary input sub-channels. Such as Figure 5 As shown, in this mapping, the two binary bits c 2i-1 and c 2i Mapped to a 4-ary modulation symbol s i .
[0097] The capacity of the first equivalent subchannel in the Gray map is larger than that of the second equivalent subchannel. When fitting these two equivalent subchannels with a binary input Gaussian channel, we have
[0098] Such as Figure 6 As shown, given the code length of 4 polar codes and the channel state, the mean value of the Gaussian distribution of 4 polar sub-channels can be calculated. Suppose the mean of the first subchannel is 0.3, the mean of the second subchannel is 1.2, the mean of the third subchannel is 2.4, and the mean of the fourth subchannel is 2.6. According to the Q function, it can be seen that the error probability of the sub-channel with a large mean value is small; assumi...
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The invention discloses a polarization code hybrid automatic retransmission request method based on high-order modulation unequal error protection characteristics, and belongs to the field of physicallayer communication protocol design in a communication system. The method comprises the following steps: firstly, for each information bit that needs to be transmitted, encoding the information bit into a codeword, modulating the codeword into a high-order symbol, sending the high-order symbol to a receiving end for decoding, in the case of failure, establishing a mathematical model and solving in view of the length and the modulation mapping mode of the codeword by using a noise condition of a real channel to obtain a subscript index of the information bit that needs to be retransmitted eachtime, retransmitting a serial number of an equivalent binary input subchannel and the retransmission times of the information bit through the equivalent binary input subchannel, recording the same ina memory, and reading the memory to obtain the symbol sequence to be retransmitted during each retransmission. According to the polarization code hybrid automatic retransmission request method, the error frame rate during decoding is low, the system throughput is improved, the performance of the entire communication system is improved, the entire system is more flexible, and the polarization codehybrid automatic retransmission request method is suitable for different parameter configurations in an actual communication system.
Description
technical field [0001] The invention belongs to the field of physical layer communication protocol design in a communication system, in particular relates to the combination of channel coding and transmission mode, in particular to a polar code hybrid automatic retransmission request method based on high-order modulation unequal error protection characteristics. Background technique [0002] Hybrid automatic repeat request technology can effectively improve communication service quality and user experience, so this technology is widely used in existing communication protocols, such as: IEEE 802.16m. Polar code is a new type of channel coding technology, which has been selected as the channel coding technology of control channel and physical layer broadcast channel in the fifth generation mobile communication technology. Therefore, it is particularly important to study the hybrid automatic repeat request technology of polar codes. At present, research institutions in many co...
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IPC IPC(8): H04L1/18H04L1/00
CPCH04L1/0003H04L1/0009H04L1/0057H04L1/0086H04L1/1819
Inventor 刘荣科田旷达
Owner BEIHANG UNIV