Constellation map simplifying apparatus, method and receiver

Abstract

The invention discloses a device and a method for simplifying a constellation diagram and a receiver of the device. The device comprises a constellation diagram divider, a coordinate axis constellation mapping unit, a constellation structure division unit, a coordinate axis displacement unit, a relative information extraction unit and a virtual constellation mapping unit, wherein the constellation diagram divider is used to divide the two-dimensional constellation diagram into X axis and Y axis one-dimensional constellation information; according to the one-dimensional constellation information and bits needed for analysis, the coordinate axis constellation mapping unit determines the mapping of the X coordinate axis or Y coordinate axis and then carries out the mapping; according to the mapped one-dimensional constellation information, the constellation structure division unit divides the structure of the constellation to acquire the constellation structure information; according to the constellation structure information, the coordinate axis displacement unit moves the vertical coordinate axis, so that the constellation symbols with analyzed bits are symmetrical about the moved vertical coordinate axis; the relative information extraction unit works out a new coordinate of the vertical coordinate axis after the analyzed bits are relatively moved; and according to the constellation structure information, the virtual constellation mapping unit generates the virtual constellation and works out the coordinate of the virtual constellation.

Description

technical field [0001] The present invention relates to a receiver of a communication system, and more particularly, to a demodulation device and method of the receiver. Background technique [0002] Quadrature Amplitude Modulation (M-QAM) has gradually become one of the main modulation methods of modern wireless communication systems because it can greatly improve the transmission efficiency of wireless communication systems without increasing the system bandwidth. However, in a wireless environment, Quadrature Amplitude Modulation (M-QAM) often requires a higher signal-to-noise ratio to meet system performance requirements. In order to overcome this shortcoming, it is often used in cascade with a channel coding method capable of iterative decoding and having better coding gain in practical applications, for example, it is used together with Turbo code or Low Density Parity Check Code (LDPC). Therefore, the combination of quadrature amplitude modulation (M-QAM) and iterati...

AI Technical Summary

Problems solved by technology

If the constellation symbol space is large (such as high-order M-QAM modulation), the computational complexity of this method is still high

This is because the mathematical expression of the same bit information will adopt different expressions because the received signal falls in different two-dimensional constellation areas, so the larger the constellation symbol space, such as high-order modulation such as 256-QAM, the divided two-dimensional constellation The more areas there are, the more expressions are used for each bit of information, which makes the expression of soft bit information more and more complex

That is, the method is still not enough to reduce the complexity of soft demodulation of quadrature amplitude modulation (M-QAM) signal

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