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16QAM fixed point demodulation method in HSDPA

A demodulation method and fixed-point data technology, applied in the direction of electrical components, orthogonal multiplexing systems, multiplexing communications, etc., can solve problems such as affecting demodulation performance, increasing block error rate, and inability to recover statistics. Achieve the effects of ensuring complexity, reducing block error rate, and improving demodulation performance

Active Publication Date: 2009-09-09
RDA CHONGQING MICROELECTRONICS TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

16QAM is a modulation method combining amplitude and phase. Compared with the quadrature phase shift keying modulation method (English: Quadrature PhaseShift Keying, hereinafter referred to as QPSK), each point in the constellation diagram has a smaller phase difference. In addition, the amplitude estimation needs to be considered to make its spectrum utilization higher. However, in the actual fixed-point data demodulation process, because the receiving end has many steps of normalization operations that cannot be statistically restored before demodulation, the signal amplitude is changed, thereby changing The constellation diagram of 16QAM is changed, which greatly affects the demodulation performance, causing the block error rate (hereinafter referred to as BLER) to increase sharply, resulting in a sharp drop in the throughput rate of HSDPA

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  • 16QAM fixed point demodulation method in HSDPA
  • 16QAM fixed point demodulation method in HSDPA
  • 16QAM fixed point demodulation method in HSDPA

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Embodiment Construction

[0009] The demodulation method of the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments:

[0010] For 16QAM, four consecutive bits correspond to a complex symbol, set b 1 , b 2 , b 3 , b 4 is the bit before modulation, according to different b 1 , b 2 , b 3 , b 4 The combination of values ​​can be used to obtain the corresponding complex number symbols, and get as figure 1 The constellation diagram shown. The mapping relationship and constellation diagram of four bits and one symbol are shown in Table 1 and figure 1 shown.

[0011] Table 1: Mapping relationship between four bits and a symbol

[0012]

[0013]

[0014] The current 16QAM demodulation algorithm in HSDPA is to first rotate the constellation diagram to become the corresponding table shown in Table 2 and figure 2 The constellation diagram shown. Then demodulate the received data on the constellation diagram. This algorit...

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Abstract

The present invention relates to a method for demodulating received fixed-point data at a receiving end in a communication system, and particularly relates to a method for demodulating received fixed-point data at a receiving end when the data at the sending end adopts a quadrature amplitude modulation (hereinafter referred to as 16QAM) method. Demodulation method for fixed-point data. The demodulation method of the present invention uses the data before demodulation to more accurately estimate the signal-to-noise ratio (hereinafter referred to as SNR), and utilizes the signal-to-noise ratio to construct a 16QAM constellation diagram matched with fixed-point received data, and then according to the constellation diagram Demodulation is performed to greatly reduce the block error rate, thereby ensuring complexity while improving demodulation performance.

Description

technical field [0001] The present invention relates to a method for demodulating fixed-point data received by a receiving end in a communication system, and in particular to mobile communication, when the data at the sending end adopts a quadrature amplitude modulation (English: Quadrature Amplitude Modulation, hereinafter referred to as 16QAM) method The demodulation method of the fixed-point data received by the receiving end. Background technique [0002] The third generation of mobile communication technology (hereinafter referred to as 3G) is an important technological milestone in wireless communication because it expands mobile phone services beyond voice and text. Due to the continuous growth of people's demand for high-speed online data services such as images, music, video, web browsing, conference calls, and e-commerce information, wireless transmission technologies with wider bandwidths and terminals with stronger functions are needed to support them. However, 3...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 王茜竹陈茜茜申敏郑建宏
Owner RDA CHONGQING MICROELECTRONICS TECH CO LTD