| 摘要 |
<p>The present invention discloses a method and device for adaptive modulation and coding based on second order statistics of channel information in OFDM system, characterized in that, by means of variance of Signal-to-Noise ratio (SNR) an appropriate adaptation time window is selected dynamically to trace the time-varying channel better; and in that a decision criterion of second order, namely selecting appropriate modulation and coding schemes (MCS) according to the average value of the SNR and the variance of the SNR, is employed to obtain accurate mapping from SNR to MCS. The mapping enhances practicability of the adaptive modulation and coding, decreases probability of system outage, and thus results in better performance of bit error rate. <IMAGE></p> |
