| 摘要 |
<p>Known channel identification and/or equalisation methods are either based on specific training sequences known a priori to both transmitter and receiver and sent at pre-defined times, or on assumptions on the statistical properties of the transmitted signal. According to the invention, the receiving site has neither the possibility to send feedback nor detailed a priori information on the characteristics of the transmission signal. The transmitter embeds information on properties of the original signal into the host signal via watermarking techniques. The watermarked signal is transmitted over the unknown channel. The receiver compares the properties of the received signal with the original properties as decoded from the embedded watermark message. These differences can be utilised to determine the channel characteristics. Using the knowledge about these channel characteristics, compensation techniques can be applied like channel equalisation and/or noise suppression filtering, or quality metrics can be computed.</p> |
