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Interference elimination apparatus and interference elimination method

A technology of interference elimination and joint detection, applied in baseband system components, multiplex communication, digital transmission systems, etc., can solve the problems of not reflecting the likelihood of signals, and not being able to improve the accuracy of error correction

Inactive Publication Date: 2004-04-21
III HLDG 12 LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, using a conventional joint detection device, when a signal with a high reception level (ie, code, frame) and a signal with a low reception level (ie, code, frame) are subjected to joint detection decoding, as a result, their signals levels become substantially the same
These signal levels do not reflect the likelihood of the signal, and when using an error correction decoding scheme that uses the scale of the decoding result as likelihood information, the accuracy of error correction cannot be improved

Method used

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  • Interference elimination apparatus and interference elimination method
  • Interference elimination apparatus and interference elimination method
  • Interference elimination apparatus and interference elimination method

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Embodiment 1

[0025] Here, a case is described using an embodiment of the present invention in which a received signal is subjected to joint detection calculation, a weight is assigned to the operation result according to the reception level, and error correction is performed using the reception level as likelihood information, thereby achieving improved receiving characteristics.

[0026] FIG. 1 is a block diagram showing the configuration of an interference canceling device according to a first embodiment of the present invention. The interference canceller 100 of Fig. 1 comprises wireless section 101, A / D converter 102, delayer 103, MF section 104a~104n, path selector 105a~105n, JD decoder 106, divider 107, multiplier 108a~108n and error correction decoders 109a-109n.

[0027] Referring to FIG. 1 , a wireless section 101 receives a wireless signal, performs wireless processing thereon such as conversion into a baseband frequency, and outputs the received signal to an A / D converter 102 ....

Embodiment 2

[0050] Here, a case will be described using the second embodiment of the present invention, in which, by normalizing the signal level of a received signal on a per-channel basis, performing a joint detection operation, and performing error correction using the received level as likelihood information decoding, to improve reception performance.

[0051] Figure 7 is a block diagram showing the configuration of an interference canceling device according to a second embodiment of the present invention. The parts in this figure that are the same as those in FIG. 1 are assigned the same reference numerals as in FIG. 1 and will not be explained further.

[0052] Figure 7 The interference canceling device includes level adjusters 701a-701n, JD decoder 702, and error correction decoder 703. The difference from the interference canceling device in FIG. information on the effective path.

[0053] exist Figure 7 Among them, the delayer 103 delays the reception signal until the pro...

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Abstract

From a delay profile, path selectors 105a~105n discard the signals other than those corresponding to valid paths, such as noise, output the channel values, which are obtained through the selection of valid paths alone, to JD decoder 106, and output the received levels of the valid paths to multipliers 108a~108n. JD decoder 106 performs joint detection operation and multiplies the operation result by a received signal that is output from delayer 103. Allocator 107 separates the soft decision data of individual users on a per user basis. Multipliers 108a~108n multiply outputs of JD decoder and received levels output of path selectors 105a~105n. Error correction decoder 109a~109n performs the hard decision of the soft decision data so as to obtain each user's demodulation data.

Description

technical field [0001] The present invention relates to interference cancellation devices and methods, and more particularly to an interference cancellation device and method that are particularly adapted for use with wireless receiving devices. Background technique [0002] Typically, a method of obtaining a decoded signal by removing various types of interference including interference due to multipath fading, inter-symbol interference, and multi-access interference employs joint detection decoding. [0003] Joint detection decoding is an example of a decoding method utilizing matrix operations. That is to say, in joint detection decoding, a predetermined matrix operation is performed using a system matrix in which channel estimation values ​​of each communication terminal (user) and channel estimates allocated to the communication terminal (user) are provided in a matrix form. The result of the convolution operation of the spreading code, and the result of the matrix ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B1/10H04B1/7105H04J13/00H04L1/22H04L25/02H04L25/03
CPCH04B1/7105H04L25/0202H04L25/03006H04B1/1027
Inventor 林真树
Owner III HLDG 12 LLC