Bit priority mapping method for high-step modulation

Abstract

The invention relates to a bit priority mapping method in high-order modulation. The method comprises the following steps: dividing a bit sequence to be modulated into two or more than two areas with different reliability levels according to corresponding different reliability levels of mapping bits of constellation points; according to a high-low position sequence, writing a high-position bit to be mapped to the area with relatively high reliability; and writing a low-position bit to be mapped to the area with relatively low reliability level. The method can maximizedly balance the reliability of the coding word bit and is simple to realize; and the method is combined with Chinese invention patent application 'a bit priority selection method in high-order modulation' previously provided by an applicant, can obtain higher link throughput performance and reduce time delay of transmission in a hybrid automatic repeat request (HARQ) mode compared with the prior art.

Description

technical field [0001] The invention relates to data transmission, in particular to a bit priority mapping method in high-order modulation. Background technique [0002] A digital communication system, structured as figure 1 As shown, it consists of a transmitter, a channel, and a receiver. The transmitter usually includes a source, a source encoder, a channel encoder, and a modulator. The receiver usually includes a demodulator, a channel decoder, and a signal source decoder and sink. [0003] In a digital communication system, the channel coding link (including channel coding, modulation and demodulation, etc.) is the most critical technology in the physical layer of the entire digital communication, which determines the effectiveness and reliability of the underlying transmission of the digital communication system. Among them: [0004] Channel Coding [0005] Channel coding is to combat all kinds of noise and interference in the transmission process. By artificially a...

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Problems solved by technology

[0016] The Chinese invention patent application "A Method for Bit Priority Selection in High-Order Modulation" proposed by the applicant in advance provides a simple and effective bit-priority mapping for HARQ data packets, including: performing Turbo Encoding; the codeword bits after Turbo encoding are rate-matched based on the circular buffer to output HARQ data packets and rearranged according to the requirements of priority protection of high-order bits; high-order modulation mapping is performed on the rearranged HARQ data packets and a A specific mapping method; under the hybrid automatic repeat request (HARQ) transmission mode, the throughput of the link is improved, and the performance of the link is enhanced. The specific mapping method is relatively limited.

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