Patent ID: 8971452
Filing Date: 2015-03-03
Classification: H04B

Abstract:
1. A system comprising: a multiple-input-multiple-output (MIMO) receiving system comprising a MIMO baseband module having N branches, each one of the N channels passing through a spatial separator and a fast Fourier transform (FFT) module; a radio distribution network (RDN) connected to the MIMO receiving system, the RDN comprising at least one beamformer, wherein each one of the beamformers is fed by two or more antennas, so that a total number of antennas in the system is M, wherein M is greater than N, wherein at least one of the beamformers include at least one combiner configured to combine signals coming from the antennas coupled to a respective beamformer into a combined signal; and a control module configured to tune the at least one beamformer based on metrics derived by the baseband module, wherein the metrics include a phase for at least some of the N channels, wherein the phases of pilot reference signals from each of N base station transmit antennas are derived from outputs of the spatial separators and fast Fourier transform (FFT) modules, wherein the baseband module is further configured to derive the metrics including a reference signal received power (RSRP) and/or a reference signal received quality (RSRQ) of each of the N channels and route said RSRP and/or RSRQ of each of the N MIMO inputs to the control module.