Method and apparatus for beam pattern stabilisation

An access point for a point to multi-point wireless communication network comprising a plurality of subscriber modules, the access point comprising:

• an array of antenna elements;
• a digital beamforming weights matrix for applying a weightset to one or more signals streams;
• a respective transmit chain for each antenna element;
• a gyroscopic sensor;
• and
• a processor configured to:
• process an output of the gyroscopic sensor to generate a plurality of first phase corrections for a first time interval and to generate a plurality of second phase corrections for a second time interval;
• measure respective signal propagation characteristics between each antenna element of the array and each of a first and second subscriber module for the first time interval;
• and
• form, based on the measured respective signal propagation characteristics, the plurality of first phase corrections and the plurality of second phase corrections, a Multi User Multiple Input Multiple Output MU-MIMO beam pattern for the second time interval having a main lobe towards the first subscriber module and a null towards the second subscriber module,
• whereby to correct for a change in orientation of the array between the first time interval and the second time interval.