| 摘要 |
The underlying invention generally relates to the field of wireless communication systems with high-speed mobile access, especially to Orthogonal Frequency Division Multiplexing (OFDM) systems considering channel estimation and/or channel tracking. More particularly, the invention provides an adaptive subcarrier loading function for a mobile receiver (1310) in a wireless communication system based on OFDM that can advantageously be applied to predict the channel transfer function H(j.omega,t) of a multipath propagation channel (1320) being severely impaired by frequency-selective fading and an extremely time-variant behavior by detecting the position and/or movement of zero points (A, B, and C) of said transfer function H(j.omega,t), thereby reducing the probability of an incorrect assignment of the modulation scheme for each subcarrier (102), that is caused by mobile terminals (405) moving at high velocity. Thereby, said zero points (A, B, C) of the estimated channel transfer function H(j.omega,t) are determined by detecting the position of deep notches on the associated amplitude response H(j.omega,t)| of the measured channel transfer function H(j.omega,t) caused by frequency-selective fading whose depths are larger than a predefined threshold. |
