Channel Variation Detection of Wireless Channel for Adaptive Transmission Schemes

An apparatus comprising:

• at least one antenna;
• a receiver that is configured to connect to the at least one antenna and to produce a received signal associated with wireless transmissions received from another wireless communication apparatus;
• a controller configured to connect to the receiver, wherein the controller is configured to:
• recover received data from the received signal;
• process the received data with each of multiple channel variation compensations to produce corresponding processed received data subjected to respective ones of the multiple channel variation compensations;
• for symbols in the received data and in each of the processed received data, compute distances to their closest symbols in a symbol constellation set used by the second wireless communication in the wireless transmissions and compute a corresponding distance metric from the distances for symbols in the received data and from the distances for symbols in each of the processed received data;
• and
• determine a channel variation of a wireless channel with respect to the other wireless communication apparatus based on the distance metrics.

Logic encoded in one or more tangible media for execution and when executed operable to:

• recover received data from a wireless transmission received at a first wireless communication device from a second wireless communication device;
• process the received data with each of multiple channel variation compensations to produce corresponding processed received data subjected to respective ones of the multiple channel variation compensations;
• for symbols in the received data and each of the processed received data, compute distances to their closest symbols in a symbol constellation set used by the second wireless communication device in the wireless transmission and compute a corresponding distance metric from the distances for symbols in the received data and from the distances for symbols in each of the processed received data;
• and
• determine a channel variation of a wireless channel between the first wireless communication device and the second wireless communication device based on the distance metrics.