Patent ID: 8654822
Filing Date: 2014-02-18
Classification: H04B

Abstract:
1. A link adaptation system, comprising: a Doppler frequency estimation unit configured to estimate a Doppler frequency of a signal transmitted via a wireless channel; a Signal to Noise Ratio (SNR) measurement interval determination unit enabled when the estimated Doppler frequency is less than a predetermined level, the SNR measurement interval determination unit being configured to determine an SNR measurement interval of the signal transmitted via the wireless channel based on the estimated Doppler frequency, and determine the SNR measurement interval as a length of a transmission data packet when the estimated Doppler frequency is greater than or equal to the predetermined level; an SNR measurement unit configured to measure an SNR of the signal based on the determined SNR measurement interval; and a Modulation Coding Scheme (MCS) level selection unit configured to select an MCS level corresponding to the wireless channel using the measured SNR, the MCS level selection unit being further configured to select any one of a first MCS level corresponding to the measured SNR and at least one MCS level adjacent to the first MCS level as the MCS level corresponding to the wireless channel, wherein, when the estimated Doppler frequency is less than the predetermined level, the SNR measurement interval determination unit determines the SNR measurement interval to be short when the estimated Doppler frequency increases, and determines the SNR measurement interval to be long when the estimated Doppler frequency decreases.