The CNR presumption device, CNR presumption manner, the CNR presumption program and adaptation transmission radio system, presuming

摘要

PPROBLEM TO BE SOLVED: To provide a CNR estimating apparatus capable of estimating a CNR (carrier to noise ratio) after transmission path equalization in an adaptive transmission wireless system. PSOLUTION: The CNR estimating apparatus for estimating a receiver side CNR in a wireless system (receiver 2) adopting a frequency region equalization system wherein the receiver side estimates a transmission path characteristic in a frequency region and applies transmission path equalization to a received signal in the frequency region is characterized in to include: a noise power estimate section 25 for estimating noise power on the basis of the received signal before transmission path equalization; and an after-equalization CNR estimate section 27 for estimating the CNR after the transmission path equalization on the basis of the transmission path characteristic estimated to have the estimated noise power. PCOPYRIGHT: (C)2005,JPO&NCIPI