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Parallelling receiving method by chip balancer and rake receiver

A rake receiver and equalizer technology, applied in the field of baseband chip-level signal reception on the mobile station side, can solve the problems of rake receiver multipath interference, poor frame error rate performance, robust system reception performance, etc., and achieve complex calculation Reduced speed, improved performance, and strong robustness

Inactive Publication Date: 2005-02-23
SOUTHEAST UNIV +1
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Problems solved by technology

[0014] Technical problem: the purpose of this invention is to provide a kind of chip equalizer and the method for Rake receiver to receive in parallel, solve existing Rake receiver when multipath interference is serious or require frame error rate to be very low when the performance is poor, and The computational complexity of the existing LMMSE adaptive chip equalizer is still high; it makes the system receiving performance more robust in the environment with large channel delay expansion

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  • Parallelling receiving method by chip balancer and rake receiver
  • Parallelling receiving method by chip balancer and rake receiver
  • Parallelling receiving method by chip balancer and rake receiver

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Embodiment Construction

[0051] figure 1 It is a signal processing flowchart of the present invention. Wherein baseband input signal 1 is the baseband signal processed through analog / digital (A / D) conversion and receiving baseband filter; Channel estimator 2 is the CDMA mobile station side channel estimator utilizing matched filtering or sliding correlation method to realize; Despreading Module 6 is the same as the existing CDMA mobile station side despreading module, and completes the functions of descrambling and despreading, and its output is a symbol level signal.

[0052] figure 2 It is a schematic diagram of the parallel method of chip equalizer and Rake4. Wherein, the equalizer 3 is an integral part of the present invention, and its specific implementation method can be found in Figure 3 ~ Figure 4 And the detailed description in the patent specification; Rake4 is similar to the existing CDMA mobile station side baseband receiving device (not including its despreading part); The output w...

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Abstract

A parallel reception of a chip balancer and a Rake receiver is used for CDMA frequency extending communication system. It is achieved by: using channel estimator to reforming guide signals for training coefficient iterative balancer, and a primary balancer linked with the former and used for basic band signals. The output of the primary balancer and the output of the Rake are synthesized at a certain ratio to be fed a demodulating and expending module. It is a chip stage of CDMA forward chain receiver with good performance, and with low working robust and calculation complication.

Description

technical field [0001] The invention relates to a baseband chip-level signal receiving method at a mobile station side of a code division multiple access (CDMA) system, and belongs to the technical field of baseband signal processing in CDMA cellular mobile communications. Background technique [0002] In the CDMA system, according to the estimation results of the channel estimator, the Rake receiver uses multiple "fingers" to point to the corresponding strong paths, and combines the outputs of these "fingers" according to the principle of the maximum ratio. despread to produce each symbol. In the current actual system, the Rake receiver has become the main choice of the CDMA forward link receiver because of its simple structure and relatively robust performance. [0003] However, when the Rake receiver extracts the component of a certain path, it regards the interference caused by other paths as white noise. This assumption makes the structure of t...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B7/08
Inventor 赵春明邱宁蒋良成缪开济尤肖虎黄鹤
Owner SOUTHEAST UNIV
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