Methods of processing signals, apparatus, and base station

A base station comprising:

• a plurality of receive antennas;
• baseband processing circuitry, configured to calculate a compression filter;
• radio processing circuitry;
• and
• a data link between the radio processing circuitry and the baseband processing circuitry,
• wherein the radio processing circuitry is configured to:
• receive a plurality of aggregated data symbols from the plurality of receive antennas, wherein each of the plurality of aggregated data symbols is composed of transmitted data symbols from a plurality of transmit terminals and corresponds to an antenna of the plurality of antennas;
• apply the compression filter, received from the baseband processing circuitry over the data link, to the plurality of aggregated data symbols to reduce the plurality of aggregated data symbols into a plurality of isolated data symbols, the compression filter being based on channel estimates between the plurality of receive antennas and the plurality of transmit terminals;
• and
• transmit the plurality of isolated data symbols to the baseband processing circuitry over the data link.

An apparatus for processing baseband frequency signals in a base station, the apparatus having one or more digital processing circuits, wherein the apparatus is configured to:

• calculate a plurality of channel response estimates based on a plurality of reference symbols associated with a plurality of transmit terminals, each of the plurality of channel response estimates approximating a wireless channel between a respective transmit terminal of the plurality of transmit terminals and a respective receive terminal of a plurality of receive terminals of the base station;
• calculate a compression filter based on the plurality of channel response estimates;
• transmit the compression filter to a radio processing apparatus of the base station;
• receive a plurality of received data symbols from the radio processing apparatus;
• and
• perform symbol detection of the plurality of received data symbols using the compression filter to generate a plurality of detected data symbols.