Rank estimation device, receiver, communication system, rank estimation method, and program recording medium

摘要

A rank estimation device in which a load on a rank estimation process can be reduced is provided.;The rank estimation device of the exemplary embodiment is characterized by comprising a SNR estimation section which calculates a communication quality value, a channel variation estimation section which calculates a variation value that varies at a receiver, and a simplified rank estimation section which estimates a transmission rank based on the communication quality value calculated by the SNR estimation section and the variation value calculated by the channel variation estimation section.

主权项

1. A rank estimation device, which estimates a transmission rank which is most suitable for data transmission based on a received signal at a receiver and reports the transmission rank to a transmitter as feedback information which is reflected to signal transmission in the transmitter, comprising:
a first calculation unit for calculating a reception quality value based on the received signal; a second calculation unit for calculating a channel variation value which indicates a degree of variation of channel state based on the received signal; a first rank estimation unit for estimating the transmission rank based on a calculation value obtained by subtracting the reception quality value from the channel variation value; and a second rank estimation unit for calculating communication capacity between the transmitter and the receiver for all the transmission ranks and estimating the transmission rank which can obtain the maximum communication capacity, wherein the first rank estimation unit outputs a rank 1 of the transmission rank indicating a poor reception condition when the calculation value is greater than a first threshold value specified for determining the rank 1 in advance as a first condition, outputs a rank 2 of the transmission rank indicating a good reception condition when the calculation value is smaller than a second threshold value specified for determining the rank 2 in advance as a second condition, and outputs error information when the calculation value satisfies neither of the first condition nor the second condition, and wherein the second rank estimation unit is used when the error information is outputted from the first rank estimation unit to estimate the transmission rank.