Method and device used for demodulating 64 quadrature amplitude modulation (QAM) and used in high speed downlink packet access (HSDPA) business
A technology of 64QAM and demodulation method, which is applied in the field of signal processing, can solve the problems that demodulation processing does not support 64QAM demodulation, etc., and achieve the effects of easy hardware implementation, simple processing and operation, and accurate soft value information
Active Publication Date: 2012-07-04
SANECHIPS TECH CO LTD
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[0006] The present invention provides a 64QAM demodulation method and device used in HSDPA services to solve the problem that the demodulation process of HSDPA services does not support 64QAM demodulation in the prior art
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[0037] The specific implementation process of the present invention will be further described in detail below with reference to the various drawings.
[0038] See figure 1 The picture shows the 64QAM modulation constellation diagram in the TD-SCDMA system. It can be seen from the figure that the 64QAM standard constellation diagram in the TD-SCDMA system has a total of 64 constellation points. The difference between the constellation points is very small. A complex symbol is mapped The bit sequence is: (bit6, bit5, bit4, bit3, bit2, bit1).
[0039] The 64QAM demodulation method used in the HSDPA service of the present invention is a soft demodulation method, and the key in the soft demodulation processing is based on the real part of the received complex symbol x(i) real[x(i)] and The imaginary part imag[x(i)] obtains the soft value output of its mapped bit sequence (bit6, bit5, bit4, bit3, bit2, bit1). The specific implementation steps are as follows:
[0040] Step S10, change fig...
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The invention discloses a method and device used for demodulating 64 quadrature amplitude modulation (QAM) and used in high speed downlink packet access (HSDPA) business, which include steps: rotating a 64 QAM constellation diagram for 45 degrees clockwise, determining a complex symbol y (i) corresponding to a received complex symbol x (i) after rotation, determining soft value information of bit 6 and bit 5 according to the y (i); turning the rotated constellation diagram along the Y axis to the left, then turning the constellation diagram along the X axis downwards, and determining soft value information of bit 4 and bit 3 according to coordinates of a central position of the turned constellation diagram and a complex symbol corresponding to the y (i); translating the central position of the turned constellation diagram to an original point of the coordinates, turning the translated constellation diagram along the Y axis to the left again, then turning the constellation diagram along the X axis downwards, and determining soft value information of bit 2 and bit 1 according to the coordinates of the constellation diagram after turning again and the complex symbol corresponding to the y (i). The method and the device used for demodulating the 64 QAM and used in the HSDPA business are simple in processing and operation, accurate in obtained soft value information and easy in hardware achieving.
Description
Technical field [0001] The present invention relates to signal processing technology, in particular to a 64QAM (Quadrature Amplitude Modulation (Quadrature Amplitude Modulation) method containing 64 symbols) used in HSDPA (High Speed Downlink Packet Access) services ) Demodulation method and device. Background technique [0002] In the TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division-Synchronous Code Division Multiple Access) terminal system solution, HSDPA needs to demodulate the received complex symbol data. According to the latest HSPA+ (High Speed Packet Access, Enhanced High Speed Packet Access) protocol requirements, it needs to support QPSK (Quaternary Phase Shift Keying), 16QAM (including 16 symbols of QAM mode), 64QAM three Modulation. [0003] The HSDPA demodulation processing in the prior art generally only supports two modulation methods of QPSK and 16QAM, including two methods of hard demodulation and soft demodulation. Hard dem...
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IPC IPC(8): H04L27/38
CPCH04L25/067H04L27/38
Inventor 伍靖
Owner SANECHIPS TECH CO LTD