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Multipath signal carrier phase error estimation device

A carrier phase error, multipath signal technology, applied in the direction of shaping network, electrical components, transmission system, etc. in the transmitter/receiver

Inactive Publication Date: 2010-04-07
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no information to provide a specific realization of fully coherent demodulation of multipath signals, and the principle of multipath signal carrier phase error estimation methods and corresponding devices that can eliminate the influence of coherent demodulation loss factor cosθ

Method used

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  • Multipath signal carrier phase error estimation device
  • Multipath signal carrier phase error estimation device

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Embodiment 1

[0036] In this embodiment, a baseband signal is used to generate a multipath carrier phase error tracking signal to realize phase error estimation. The schematic diagram of the phase error tracking signal generation circuit in the multipath signal carrier phase error estimation device is shown in figure 1 . It mainly consists of the following parts: including the eleventh multiplier M for multiplying two baseband signals with multiple local PN sequences 11 , the twelfth multiplier M 12 , the thirteenth multiplier M 13 , the fourteenth multiplier M 14 , the fifteenth multiplier M 15 , the sixteenth multiplier M 16 , for the eleventh multiplier M respectively 11 , the twelfth multiplier M 12 , the thirteenth multiplier M 13 The eleventh processor 11, the twelfth processor 12, and the thirteenth processor 13 that process the output baseband signal are used to combine the baseband signal output by the processor with the corresponding fourteenth multiplier M 14 , the fift...

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Abstract

A multipath signal carrier phase error estimation device is used to realize the coherent demodulation of down rake receiver. The expressions of the multipath received signal carrier wave and the local carrier phase error theta can be exported according to the expression of multipath received signal and the following instruction book provides the exporting process; the multipath signal carrier phase error estimation device is provided according to the expressions. The device separately sends the outputs of QAM coherent demodulator to six multiplier units of In-phase and Quadrature, the outputs of three multiplier units of In-phase are sent to three processors and then sent to the other three multiplier units to be multiplied by the three outputs of three multiplier units of Quadrature, and finally the phase error tracking signal of signal in each path can be obtained; the phase error tracking signal control phase shifter adjusts the phase of local coherent carriers and recovers the local coherent carriers which are separately synchronous with three-path received signal carriers, the local coherent carriers are used to demodulate three-path signals and finally the In-phase and Quadrature of the three-path signals are separately combined and descrambled.

Description

technical field [0001] The invention relates to a device for estimating carrier phase error of a multipath receiving signal used for coherent demodulation of a multipath receiving signal in a downlink rake receiver, which can greatly improve the efficiency of multipath diversity reception of a rake receiver and improve multipath receiving signal The power utilization ratio belongs to the technical field of mobile communication. Background technique [0002] The CDMA mobile phone receiving equipment using RAKE receiver is a high-tech product in the field of mobile communication. The multipath signal carrier phase error estimation device is a high-tech device used in the downlink rake receiver of the CDMA system, which can improve the power utilization rate of the multipath received signal of the downlink channel in the code division multiple access system and the received signal-to-noise ratio of the receiver. Although there are many materials mentioning that traditional RAK...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L25/03H04B1/711
Inventor 傅海阳刘雄贾向东钱巍巍丁蔚
Owner NANJING UNIV OF POSTS & TELECOMM
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