US 2004/0171351 A1Published application

Interference measurement and evaluation system

AssigneesFujitsu Limited, National Institute of Information and Communications Technology, Kddi Corporation

InventorsIsao Nakazawa, Yoshiaki Kobayashi, Ryoichi Shimada, Toshikazu Youkai, Tatsuaki Hamai, Kaoru Murakami, Hiroyo Ogawa

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Abstract

An interference measurement and evaluation system for accurately estimating an interference characteristic of a receiving side including nonlinear interference for a wireless communications system, having a transmission signal for wireless communication and an interference signal between a transmitting means and receiving means, provided with a nonlinear interfering means for giving an interference signal having a level unable to be neglected compared with the level of the modulated carrier transmitted from the transmitting means, and provided with an interference characteristic estimating means for estimating an interference characteristic including a nonlinear interference characteristic possessed by a receiving means in accordance with a received signal level and a received level when a nonlinear interference theoretical curve given in relation with the line quality satisfies a predetermined line quality.

Claims15

Dependent claims

An interference measurement and evaluation system comprised of:

a transmitting means for transmitting a digitally modulated wave signal,
a receiving means for decoding a modulated signal from a modulated wave signal received from the transmitting means, and
and interference characteristic estimating means for estimating an interference characteristic including a nonlinear interference characteristic by which said received modulated wave signal is affected from an interference signal with respect to said received modulated wave signal due to the nonlinear characteristic of said receiving means,
said interference characteristic estimating means referring to a level of said modulated wave signal received by said receiving means, a level of said interference signal, and a nonlinear interference theoretical curve given in relation to a line quality of a modulated signal decoded by said receiving means and estimating an interference characteristic including the nonlinear characteristic possessed by said receiving means, based on the measured level of the modulated wave signal, level of said interference signal, and line quality of said decoded modulated signal.

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Dependencies are inferred from the claim text.