Reception device

A receiving device and wireless receiving technology, applied in the direction of electrical components, transmission systems, etc., can solve the problems of small diffusion rate, high power, large number of multipaths, etc., and achieve the effect of circuit scale reduction

Inactive Publication Date: 2006-07-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As described above, in the conventional RAKE synthesis receiver, when the spread rate is small, the number of multipaths is large, or the interfering signal that is the multipath component of the desired signal and the multipath component of other signals after code multiplexing When the power of the signal is greater than the power of the desired signal, there is a problem that the reception characteristics are greatly deteriorated because the interference signal cannot be sufficiently suppressed by the inverse diffusion process.

Method used

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Embodiment approach 1

[0023] Embodiment 1 will be described. figure 1 The configuration of Embodiment 1 of the present invention is shown. exist figure 1 In this case, the received signal is received by the receiving antenna 101 , received power amplification, down-conversion, A / D conversion, etc. are performed in the wireless receiving unit 102 , and input to the demodulation unit / path combining unit 103 . In the demodulation unit / path combining unit 103, the despreading process is performed using the spreading code assigned to each mobile station, and the data channel signal extracted after the path combining is output to the decoding unit 104. In the decoding unit 104, the input data channel signal is decoded, and the decoded signal is taken out.

[0024] figure 2 The configuration of the demodulation unit / path synthesis unit 103 is shown. exist figure 2 Among them, the received spread signal is sent to the path detection unit 201, and then input to the CIR (channel impulse response) esti...

Embodiment approach 2

[0042] Embodiment 2 will be described. Figure 4 The structure of the receiver in Embodiment 2 is shown. again, in Figure 4 In , the same reference numerals are assigned to the same parts as those in Embodiment 1, and description thereof will be omitted.

[0043] In this embodiment, after the number of the target paths is determined in the path detection unit 201, tap coefficients corresponding to the number of target paths are obtained in the CIR estimation unit 202 or the tap coefficient calculation unit 203, and these outputs are input to Delay amount / tap coefficient control unit 301 . The delay amount / tap coefficient control unit 301 performs control so that the set delay amount and the number of tap coefficients are determined based on the target path number information, and the operation of the remaining circuits equal to or greater than the target path number is not performed.

[0044] For example, control is performed such that when the number of paths described in...

Embodiment approach 3

[0049] Embodiment 3 will be described. Figure 5 The structure of the receiver in Embodiment 3 is shown. again, in Figure 5 In , the same symbols are assigned to the same parts as those in Embodiment 1 and Embodiment 2, and description thereof will be omitted.

[0050] In this embodiment, the RAM 401 is used instead of the variable delay units 204-1 to 204-N.

[0051] The RAM 401 has a function of delaying the reception spread signal according to each delay amount output from the delay amount / tap coefficient control unit 301 and outputting a signal corresponding to the delay amount.

[0052] The respective outputs of the path detection unit 201, the CIR estimation unit 202, and the tap coefficient calculation unit 203 are input to the delay amount / tap coefficient control unit 301, and are controlled according to the number of target paths.

[0053] According to the delay amount output from the delay amount / tap coefficient control unit 301, output signals corresponding to t...

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Abstract

In a conventional RAKE synthesis reception device, when the spread ratio is small and the number of multi-paths is large, or when the interference signal power is large as compared to a desired signal power, suppression of the interference signal by the de-spreading processing is insufficient and the reception characteristic is significantly deteriorated. The reception spread signal which has been subjected to spread-encoding is subjected to de-spread processing by a spread code in a demodulation section/path synthesis section. The demodulation section/path synthesis section of the reception device for decoding by a decoding section includes a CIR estimation section for outputting a tap coefficient and a tap coefficient calculation section, so that the CIR estimation section and the tap coefficient calculation section are switched from one to the other by a switch device. The demodulation section/path synthesis section further includes an integration device for weighting the reception spread signal by the tap coefficient and synthesizing the signal and a de-spread section for de-spreading the synthesized signal by an assigned spread code. By sharing the interference suppression section with the conventional RAKE reception device, it is possible to reduce the circuit size.

Description

technical field [0001] The present invention relates to a receiving device of spectrum diffusion communication method and CDMA (Code Division Multiple Access) communication method. Background technique [0002] In a mobile communication system using CDMA, high-speed data communication using a downlink is proposed. The spread code of this method differs depending on the mobile station. At the base station, the spread code is used for spreading orthogonal to each other. At each mobile station, the multiplexed transmitted signal uses the received signal allocated to the own station. The diffusion code, and then use the matched filter to despread (despread) to extract the signal of the own station, so that the signal of the own station address is distinguished from the signals of other mobile station addresses, and then received. [0003] In a multi-path environment in which delay waves are generated due to the transmission environment, despreading is perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707
CPCH04B1/712H04B1/7115H04B1/7107
Inventor 山崎健一郎永易孝幸
Owner MITSUBISHI ELECTRIC CORP
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