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Demodulator and demodulating method for high-speed data packet access system

A technology for accessing systems and demodulation methods, applied in the field of demodulation methods and demodulators, can solve problems such as reducing demodulation performance, and achieve the effect of improving demodulation performance and being easy to implement in hardware

Active Publication Date: 2010-01-13
SANECHIPS TECH CO LTD
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Problems solved by technology

In addition, the CQI estimation by the formula (2) is also based on the SNR of the CPICH, that is, the δ value is obtained based on the SNR of the CPICH, so using th

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  • Demodulator and demodulating method for high-speed data packet access system
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[0055] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0056] The present invention provides a demodulation method in a high-speed data packet access system, which is suitable for demodulating signals modulated in 16QAM mode, including:

[0057] The soft bits are determined according to the received signal as follows:

[0058] b3=re(r)=I

[0059] b2=im(r)=Q

[0060] b1=2a-|re(r)|=2a-|I|(3)

[0061] b0=2a-|im(r)|=2a-|Q|

[0062] Where r is the symbol of the received data, 2a is the value of the decision line, and I and Q are the in-phase and quadrature-phase signals of the HS-PDSCH (High Speed ​​Physical Downlink Shared Channel) converted from the received signal, such as figure 1 Shown.

[0063] After the soft bits are generated, they are sent to the HS-DSCH channel decoder for further processing.

[0064] Among them, 2a is directly based on the HS-DSCH channel compensation symbols to estimate 2a accord...

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Abstract

The invention discloses a demodulating method for a high-speed data packet access system, which is suitable for demodulating the signal in a 16QAM mode by confirming the soft bit according to the received signal, wherein b3 is equal to I, b2 is equal to Q, b1 is the absolute value of the difference between the b3 and 2a, b0 is the absolute value of the difference between the b2 and the 2a, the I and the Q are respectively the same-phase signal and the quadrature-phase signal of the high-speed physical downlink shared channel, which are transformed from the received signal, the 2a is the judging line, P in a formula at the lower right is the multi-code channel number, and N in the formula is the averaging number. The symbol of a high speed downlink shared channel (HS-DSCH) is directly used in the technical scheme of the invention to estimate the amplitude, thus the demodulation performance can be improved. A method of easily and accurately obtaining the judging line is provided for the signal demodulation in the 16QAM mode through the optimum technical scheme of the invention, without estimating two channels and filtering, thus the hardware can be realized more easily.

Description

technical field [0001] The invention relates to the communication field, in particular to a demodulation method and a demodulator in an HSDPA (High Speed ​​Data Packet Access) system. Background technique [0002] In the HSDPA system, in order to improve the throughput and spectrum utilization rate of the cell, adaptive modulation and coding (AMC) technology is adopted. This technology enables the base station Node-B to adjust the modulation mode and coding efficiency in a timely manner according to the current wireless channel status fed back by the user equipment UE, so as to match the data transmission rate with the channel status. There are two modulation methods in the current version of HSDPA: QPSK (Quadrature Phase Shift Keying) and 16QAM (Quadrature Amplitude Modulation). [0003] The constellation diagram of 16QAM modulation is as follows figure 1 shown. [0004] Depend on figure 1 It can be seen that 16QAM modulation is a combination of amplitude and phase quad...

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Application Information

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IPC IPC(8): H04L27/38
Inventor 陶建平杜凡平
Owner SANECHIPS TECH CO LTD
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