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Adaptive predicting smoothing RAKE reception method and receiver

An adaptive prediction and receiving method technology, applied in the direction of code division multiplexing system, electrical components, transmission system, etc., can solve the problems of channel interference, small Doppler frequency shift tolerance, performance deterioration, etc., and achieve fast Strong adaptability to changes, reduced system delay, improved demodulation signal-to-noise ratio and improved processing speed

Inactive Publication Date: 2004-05-19
INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND +1
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AI Technical Summary

Problems solved by technology

This kind of RAKE receiver requires that the phase disturbance caused by channel interference be limited to a small range, and the tolerance to channel interference and Doppler frequency shift is small. Once the above restrictions are not met, the performance will deteriorate sharply

Method used

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  • Adaptive predicting smoothing RAKE reception method and receiver
  • Adaptive predicting smoothing RAKE reception method and receiver
  • Adaptive predicting smoothing RAKE reception method and receiver

Examples

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Embodiment Construction

[0019] The preferred way to realize the invention is illustrated below in conjunction with the accompanying drawings:

[0020] see figure 1 : Among them, 1 is the short filter bank, 2 is the medium filter bank, and 3 is the long filter bank. The difference between the short filter bank 1, the medium filter bank 2 and the long filter bank 3 is that the short filter bank 1 The lengths of the two key filters in the medium are max{M-ΔM, 0} and max{N-ΔN, 0}, the lengths of the two key filters in the medium filter bank 2 are M and N, and the lengths of the long filter bank 3 The two key filter lengths are min{M+ΔM, M max} and min{N+ΔN, N max}, 4 is a three-choice selector, 5 is a signal-to-noise ratio measurement and comparator, and 6 is a filter parameter database.

[0021] see figure 2 : Wherein, 7 is the matched filter of the Kth (1<=K<=P) path data, 8 is the matched filter of the Kth path pilot and the delay search tracker of the Kth path, and 9 is the Kth path Pilot filte...

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Abstract

The present invention can eliminate the multipath effect, channel interference and Doppler effect in mobile communication. The reception method includes the direct treatment of the received RF baseband signal with filter, multiplier and preset data and the direct feeding of the treated signal to the software adjudication decoder. The RAKE receiver of the present invention consists of matching filter, delay search tracker, predicting filter, smoothing filter, delay regulator, multiplier, multipath adder, filter parameter data base, S / N measuring comparator and one-out-of-three selector.

Description

(1) Technical field: [0001] The invention belongs to the field of Code Division Multiple Access (CDMA) mobile communication. Especially related to adaptive predictive smooth RAKE receiving method and receiver (two) background technology: [0002] Code Division Multiple Access (CDMA) spread spectrum communication is a multiple access method that is widely used in communication systems at present. It has excellent characteristics such as anti-interference, anti-multipath fading and large system capacity. In the CDMA mobile communication system, there are direct waves and reflected waves in the propagation of space electromagnetic waves, so the received signal is the multipath superposition of the transmitted signal after propagation, which is the multipath effect of reception. At the same time, the random noise of the space channel has random interference on the amplitude and phase of the electromagnetic wave of each path, and this interference is called channel interference...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/16H04B1/7115
Inventor 卫国张铎邱玲朱近康
Owner INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND
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