METHODS, REMOTE RADIO UNITS AND BASE BAND UNITS OF A DISTRIBUTED BASE STATION SYSTEM FOR HANDLING UPLINK SIGNALS

摘要

Disclosed is a method performed by a RRU (120) of a distributed base station system (100) of a wireless communication network, the RRU (120) being connected to a BBU (110) over a fronthaul link (140), the RRU (120) being connected to N antennas (121, 122, 123). The method comprises obtaining uplink signals as received at the antennas (121, 122, 123) from UEs (131, 132, 133) wirelessly connected to the RRU (120), and obtaining a channel estimation matrix of wireless communication channels between UEs (131, 132, 133) and the antennas (121, 122, 123). The method further comprises determining an error estimation matrix based on the channel estimation matrix, and on received reference signals y_ref,l, the received reference signals having L symbols, L being smaller than N, determining intermediate signals, based on the uplink signals, the channel estimation matrix and the error estimation matrix, and sending to the BBU (110) over the fronthaul link (140), the determined intermediate signals.