QAM-based mapping method and device
A mapping method and mapping relationship technology, applied in the field of communication, can solve problems such as bit group errors, high bit error rate, and bit misalignment
Active Publication Date: 2019-01-04
BEIJING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology
Due to the error of the first three bits of 010 in the demodulated bit stream, the adjacent 1110010 of this bit group cannot be aligned with the bit stream before demodulation, so the total number of bits after demodulation will increase, which will make Each bit in the demodulated bit stream and the bit stream before demodulation is misaligned, and because a bit group in the demodulated bit stream is wrong, it will cause the bit group after this bit group in the demodulated bit stream The bit groups are all wrong, so the bit error rate is high
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[0063] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0064] In view of the increase in the total number of bits after demodulation in the prior art, each bit in the bit stream after demodulation and the bit stream before demodulation will be dislocated, and because the bit stream after demodulation An error in one bit group in the demodulated bit stream will cause errors in all the bit groups after this bit group in the demodulated bit stream, so that the bit error rate is relatively high. Embodiments of the pres...
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The embodiment of the invention provides a QAM-based mapping method and device. The method comprises the following steps: obtaining bit streams to be mapped, wherein the bit streams to be mapped include bit groups in multiple bit streams to be mapped, and the total number of bits of the bit groups in each bit stream to be mapped is the same with the total number of bits of each preset mapping bit;and using the first mapping relationship between the preset mapping bit and the constellation point coordinates corresponding to the preset mapping symbol to map the bit groups in the bit streams tobe mapped into the constellation point coordinates corresponding to the preset mapping symbol, wherein the first mapping relationship is obtained based on the Hamming distance between the preset mapping bit and the preset mapping bit adjacent to the preset mapping bit being less than or equal to 1 for any preset mapping bit in the QAM constellation diagram, B, the total number of bits of each preset mapping bit is identical, and the total number of bits of each preset mapping bit is the same with the total number of bits of each bit group in the bit streams to be mapped.
Description
technical field [0001] The invention relates to the communication field, in particular to a QAM-based mapping method and device. Background technique [0002] In recent years, due to the popularity of applications such as 4K ultra-high definition, 3D, and cloud services, as well as various terminal devices, the demand for transmission rates is increasing exponentially, and various modulation schemes have been proposed to provide higher spectral efficiency and transmission rates. . [0003] In general existing modulation schemes, the main steps include: [0004] The first step is to receive the bit stream to be transmitted; the second step is to use the QAM constellation diagram to map the bit stream to the constellation point coordinates corresponding to the symbols; the third step is to map the constellation point coordinates corresponding to the symbols based on the bit stream Perform QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation); the fourth step...
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IPC IPC(8): H04L27/34H04L27/36
CPCH04L27/3405H04L27/362
Inventor忻向军张琦田清华吕凯陶滢田凤曹桂兴沈宇飞陈东周业军高梓贺钱晋希丁睿王拥军杨雷静
OwnerBEIJING UNIV OF POSTS & TELECOMM