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Wireless Receiving Apparatus, Wireless Transmitting Apparatus, and Interference Signal Removing Method

a technology of wireless transmission and interference signal, applied in the direction of amplitude demodulation, line-fault/interference reduction, baseband system details, etc., can solve the problems of transmission performance deterioration and not negligible, and achieve the effect of efficiently cancelling interference signals in multi-carrier communication

Inactive Publication Date: 2008-08-14
INTERDIGITAL PATENT HLDG INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]According to the invention, it is possible to cancel interference signals efficiently in multicarrier communication.

Problems solved by technology

However, when high-speed transmission is performed in mobile communication, the influence of delayed waves by multipath is not negligible, and transmission performance deteriorates due to frequency selective fading.

Method used

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  • Wireless Receiving Apparatus, Wireless Transmitting Apparatus, and Interference Signal Removing Method
  • Wireless Receiving Apparatus, Wireless Transmitting Apparatus, and Interference Signal Removing Method
  • Wireless Receiving Apparatus, Wireless Transmitting Apparatus, and Interference Signal Removing Method

Examples

Experimental program
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Effect test

embodiment 1

[0056]FIG. 5 shows a configuration of a radio communication base station apparatus (referred to as a “base station”) 100 according to the present embodiment. Further, FIG. 6 shows a configuration of mobile station 200 according to the present embodiment.

[0057]In base station 100 shown in FIG. 5, coding section 101 encodes transmission data (bit sequence) and outputs encoded transmission data to modulating section 102.

[0058]Modulation section 102 modulates the encoded bit sequence, generates a symbol and outputs the symbol to repetition section 103.

[0059]Repetition section 103 repeats the input symbol (referred to as “repetition”) and generates a plurality of same symbols. For example, when the repetition factor (RF) is four (RF=4), repetition section 103 obtains the four same symbols per symbol inputted from modulation section 102. In addition, here, sixteen symbols, S1 to S16, are subjected to repetition with the RF of 4 (RF=4) In other words, repetition section 103 obtains four sy...

embodiment 2

[0078]FIG. 8 shows a configuration of base station 300 according to the present embodiment. Base station 300 further has interleaver 301 in the configuration of base station 100 (FIG. 5) according to Embodiment 1.

[0079]Here, when symbols are subjected to repetition as in Embodiment 1, the plurality of same symbols subjected to repetition may be interleaved the frequency domain so that it is possible to improve the diversity effect in the frequency domain. Further, the plurality of same symbols subjected to repetition may be interleaved in the time domain so that it is possible to enhance the diversity effect in the time domain.

[0080]However, the mapping pattern of desired signals subjected to repetition onto subcarriers and a mapping pattern of interference signals subjected to repetition onto subcarriers needs to be the same in the frequency domain so that it is possible to obtain a desired signal by canceling interference signals from a received signal in mobile station 200 accord...

embodiment 3

[0086]Mobile station 200 according to Embodiment 1 increases the processing amount of matrix operation in MMSE processing, as the RF (Repetition Factor) increases. Therefore, in the present embodiment, MMSE processing is divided and performed.

[0087]FIG. 11 shows a configuration of mobile station 400 according to the present embodiment. In addition, in FIG. 11, the same components as mobile station 200 (FIG. 6) according to Embodiment 1 are assigned the same reference numerals and are not described. Further, in FIG. 11, the internal configuration of interference cancellation sections 403-1 to 403-3 is the same as the internal configuration of interference cancellation section 213 in FIG. 6.

[0088]In case of OFDM symbols at the beginning of the frame in FIG. 7, selecting section 401 outputs the pilot symbols mapped onto subcarriers #1 to #8 to channel estimating section 402. Further, selecting section 401 selects the plurality of same symbols according to the mapping pattern at the tim...

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Abstract

A wireless receiving apparatus capable of efficiently removing interference signals in a multicarrier communication. In a mobile station (200) incorporating this wireless receiving apparatus, a selecting part (205) selects a plurality of the same symbols in accordance with a mapping pattern established at the time of generating OFDM symbols in a base station. A correlation value calculating part (207) determines correlation values between the subcarriers of the same symbols to generate an R-matrix, and further determines an inverse matrix of the R-matrix. An MMSE processing part (208) performs an MMSE processing to determine a weight (W) from both a P-vector received from a channel estimating part (206) and the inverse matrix of the R-matrix received from the correlation value calculating part (207). Multipliers (209-1 to 209-N) multiply each of the symbols selected by the selecting part (205) by the weight determined by the MMSE processing part (208). A combining part (210) combines the symbols as multiplied by the weight.

Description

TECHNICAL FIELD[0001]The present invention relates to a radio receiving apparatus, radio transmitting apparatus and interference signal cancellation method.BACKGROUND ART[0002]In recent years, in radio communication, particularly in mobile communication, various kinds of information such as images and data as well as speeches are subjected to transmission. From now on, it is expected that demands further increase for transmitting various types of content, and it naturally follows that the need for high-speed transmission is expected to further increase. However, when high-speed transmission is performed in mobile communication, the influence of delayed waves by multipath is not negligible, and transmission performance deteriorates due to frequency selective fading.[0003]Multicarrier communication such as OFDM (Orthogonal Frequency Division Multiplexing) is focused as one of counter techniques of frequency selective fading. Multicarrier communication is a technique of transmitting da...

Claims

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Application Information

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IPC IPC(8): H04B15/00H03D1/06H04J99/00
CPCH04L27/2647H04B7/0842
Inventor MIYOSHI, KENICHINISHIO, AKIHIKOIMAMURA, DAICHI
Owner INTERDIGITAL PATENT HLDG INC
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