Wireless communication apparatus, wireless communication method and computer program therefor

A wireless communication and wireless communication device technology, applied in the field of wireless communication methods and computer programs, can solve the problems of increasing the size of the circuit and achieve the effect of reducing the amount of calculation

Inactive Publication Date: 2007-03-14
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0036] However, the use of expression (7) still poses the problem that the circui...

Method used

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  • Wireless communication apparatus, wireless communication method and computer program therefor
  • Wireless communication apparatus, wireless communication method and computer program therefor
  • Wireless communication apparatus, wireless communication method and computer program therefor

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Embodiment Construction

[0073] The embodiments of the present invention will be described below with reference to the drawings.

[0074] These embodiments relate to a communication device that performs reception processing on a received signal of multi-level modulation such as QAM modulation. More specifically, these embodiments relate to a QAM receiver, which is used to reduce the amount of calculation required for the demodulation circuit to determine the possibility of the received symbol relative to the reference symbol to demap it. These embodiments are applicable to the case of demodulating the received 16-QAM mapping signal according to the MB-OFDM communication scheme.

[0075] As a demodulation scheme corresponding to the QAM scheme, a demodulation scheme using an LLR that obtains ideal characteristics so as to enable complete demodulation is known. In the step of LLR calculation, the bit value of each transmitted bit is selected to maximize the posterior condition probability after reception. H...

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Abstract

The present invention relates to a wireless communication apparatus, wireless communication method and computer program therefor. A technology for demodulating the received QAM mapping signal is provided using a known coordinate rotation digital computer performed by a complex arithmetic method i.e., CORDIC. The rotation angle for estimating the impulse response is obtained from pilot symbols and the rotation compensation of a data symbol using arc tangent are simultaneously performed. A reference symbol is set on one of the I axis and Q axis of a signal space only, thus a reference symbol closest from a reception symbol can be determined by referring to only a value of one side of the I axis or the Q axis. Since complex distance is not obtained, arithmetic processing can be simplified.

Description

Technical field [0001] The present invention relates to a wireless communication device, a wireless communication method, and a computer program for receiving processing of ultra-wideband (hereinafter referred to as "UWB", ultra-wideband) signals using a very wide frequency band. More specifically, the present invention relates to a wireless communication device, a wireless communication method, and a computer program for respectively demodulating received multi-level modulated signals with a reduced amount of calculation. [0002] More specifically, the present invention relates to a method for demodulating the received multi-level modulation symbol (symbol) by performing likelihood determination (likelihoo ddetermination) with respect to a reference signal point in the signal space (signal constellation) by reducing the amount of calculation Wireless communication device, wireless communication method and computer program. More specifically, the present invention relates to a wi...

Claims

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Application Information

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IPC IPC(8): H04L27/38H04B1/713H04J11/00H04J13/00H04L27/00
CPCH04B1/71632H04L27/261H04L27/2602H04L25/03171H04L27/3872H04W60/00H04L25/067H04B1/71637H04W12/06
Inventor 渡部胜己
Owner SONY CORP
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