Demodulation method and device for unipolar modulated signal

A technology of unipolar modulation and demodulation method, which is applied in the field of signal demodulation method and device, which can solve the problems of affecting the accuracy of demodulation results, large noise interference, and decreased accuracy of threshold judgment, so as to reduce the amount of information transmission , improve performance and reliability, improve the effect of accuracy

Inactive Publication Date: 2004-09-08
HUAWEI TECH CO LTD
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Problems solved by technology

[0005] As an alternative to the above method, if a certain indicator of the reference channel, such as SIR or the required signal level, is firstly obtained, and then the method of subtracting the power offset between the target channel and the reference channel is used to demodulate the unipolar modulation signal, since the unipolar modulation signal fluctuates, and hard

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  • Demodulation method and device for unipolar modulated signal
  • Demodulation method and device for unipolar modulated signal
  • Demodulation method and device for unipolar modulated signal

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[0033] In the traditional bipolar signal modulation method, the signal is modulated into + (positive) 1 and-(negative) 1 signals, for example, the original information 1 is modulated to -1, and the original information 0 is modulated to +1, regardless of the positive or negative signal. , +1 or -1 are required for power transmission. Since most of the paging indication signals of PICH are 0, it will inevitably lead to the transmission of useless information on this channel for most of the time. Therefore, a unipolar signal modulation method is adopted, that is, no modulation is performed when the paging instruction signal is 0, or when the paging instruction signal is 0, it is equivalent to not using the transmission power. When it is 1, the signal is modulated to +1 or- 1 launch, you can greatly save the transmission power of PICH. For example, in order to be as consistent with the original system as possible, choose to modulate 1 to -1.

[0034] The above-mentioned unipolar modu...

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Abstract

The demodulation method of unipolar modulated signal includes first obtaining the unipolar demodulation signal of paging indication channel (PICH) by utilizing the information of common pilot channel (CPICH); estimating the fading period of the propagation channel with Doppler frequency in the same time; obtaining CPICH reference level based on the fading period; determining the PICH hard judgment threshold with the power bias of CPICH and PICH and the reference level; and finally judging the unipolar demodulation signal with the threshold to obtain demodulated unipolar signal. The said method can overcome the effect of fading on the statistical threshold precision of unipolar modulation signal to raise the demodulation performance and reliability of unipolar modulation signal. The present invention also provides one kind of unipolar modulation signal demodulating device.

Description

technical field [0001] The invention relates to a signal processing method in a communication system, especially a signal demodulation method and device. Background technique [0002] In the Wideband Code Division Multiple Access (WCDMA) system, for downlink common channels such as the Paging Indicator Channel (PICH), the biggest feature of this type of channel is that most of its paging indicator signals are 0, and only a few Its paging indication signal is 1. Since the signal is modulated by the method of bipolar modulation signal in the current system, the paging indication only instructs the relevant terminal to read the accompanying S-CCPCH (auxiliary common control physical channel) signal when it is 1, or only at this time The paging indication is meaningful, so under this modulation method, the channel is often transmitting useless information 0. That is, many times the channel is transmitting useless information. [0003] In order to save the downlink transmissio...

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Application Information

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IPC IPC(8): H04B1/76H04B7/26H04J13/00
Inventor 刘军
Owner HUAWEI TECH CO LTD
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