| 摘要 |
The present invention proposes a signal processing method for processing a signal having been transmitted via a transmission channel, the method comprising the steps of: receiving (S11) a plurality of samples of said signal; analyzing (S12) the amplitude of a subset of said plurality of received samples; and estimating (S13) the variance of said signal based on the amplitude of said subset of said plurality of received samples. Also, the present invention presents a corresponding signal processing device. Thus, with the present invention it is possible to estimate the variance on the basis of the amplitude of the received signal. In consequence, no information about channel impulse response or training sequence is required. Additionally, no "preprocessing" is required in order to obtain a channel impulse response function on the basis of which the variance is subsequently estimated, which reduces the required processing time. Also, the present invention advantageously provides a very simple method to estimate the signal variance (noise energy). Still further, the present invention can advantageously be used in connection with LMMSE based type of channel impulse response estimation devices and methods, where the variance is supplied as a parameter to the estimation device. |
