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An Improved High-Order Qam Modulation Transmission Method

A modulation transmission, high-order technology, applied in the field of improved high-order QAM modulation transmission, can solve the problem of signal-to-noise ratio decrease at the receiving end, and achieve the effects of increasing average power, low computational complexity, and low implementation complexity

Active Publication Date: 2022-02-01
SOUTHEAST UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Depend on figure 2 It can be seen that not every 16QAM constellation point has the same modulus. When the transmitted symbol is the constellation point mapped by 0110, the signal-to-noise ratio at the receiving end obviously drops

Method used

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Embodiment Construction

[0023] Specific embodiments of the present invention are described below in conjunction with accompanying drawings, so that those skilled in the art can better understand the present invention.

[0024] The implementation steps of an improved high-order QAM modulation transmission method of the present invention are as follows: Figure 4 Shown:

[0025] Step 1), divide the bits to be sent into groups with the same length according to the modulation order L, each group has M bits, L=2 M And M>2;

[0026] Step 2), then divide the sending bits into blocks of the same length, each block has N groups, and has NM bits in total;

[0027] Step 3), the bits of each block are cyclically shifted by m, where m=0,1,2,...,M-1, M bit sequences can be obtained;

[0028] Step 4), carry out the QAM modulation that order is L to each bit sequence, and calculate average power;

[0029] Step 5), the sending end selects the QAM signal obtained by a shift method with the strongest average power ...

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Abstract

The invention discloses an improved high-order QAM modulation transmission method. Firstly, according to the modulation order L, the bits to be transmitted are divided into groups with the same length, each group has M bits, and L=2 M And M>2; secondly, the transmitted bits are divided into blocks of the same length, each block has N groups, and there are NM bits in total; next, the bits of each block are cyclically shifted with a number of m bits, where m =0,1,2,...,M−1, M bit sequences can be obtained. Perform QAM modulation with an order of L for each bit sequence, and calculate the average power; finally, the sender selects the QAM signal obtained by a shift method with the strongest average power to send, and tells the value of the shift through the control channel Receiving end.

Description

technical field [0001] The invention relates to an improved high-order QAM modulation transmission method, which belongs to the field of signal processing in mobile communication systems. Background technique [0002] In a wireless communication system, in order to improve spectrum utilization efficiency, the information bits to be sent usually need to be modulated into symbols and sent. Commonly used symbol modulation methods include phase shift keying (PSK) and quadrature amplitude modulation (QAM). For example: the fifth generation mobile communication (5G) system supports QPSK, 16QAM, 64QAM and 256QAM modulation in both uplink and downlink. [0003] According to the number of bits required for modulation, it can be divided into low-order and high-order modulation. For example: QPSK modulation requires 2 bits, which belongs to low-order modulation, and the modulated constellation diagram is as follows figure 1 shown. Depend on figure 1 It can be seen that different v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04L27/36
CPCH04L27/3483H04L27/362
Inventor 盛彬张辉顾佳雯张佳丽
Owner SOUTHEAST UNIV
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