Apparatuses and Methods for Sequential Receive Combining

A method, performed by a first Antenna Processing Unit (APU) for sequential receive combining in a radio stripe system, wherein the radio stripe system comprises at least two APUs and a Central Processing Unit (CPU) the at least two APUs being connected in series to the CPU, wherein the radio stripe system serves at least two User Equipment (UEs) the method comprising:

• obtaining channel estimates for channels to said served UEs;
• determining a receive combining filter based on the obtained channel estimates, wherein the receive combining filter is going to be applied to received data signals;
• determining effective channels from said served UEs based on the obtained channel estimates and the determined receive combining filter, wherein the effective channels represent the effective channel created after the receive combining filter being applied to each channel for said served UEs;
• and
• transmitting the effective channels from said served UEs to at least one subsequent second APU.

A method, performed by a second Antenna Processing Unit (APU) for sequential receive combining in a radio stripe system, wherein the radio stripe system comprises at least two APUs and a Central Processing Unit (CPU) the at least two APUs being connected in series from the CPU, wherein the radio stripe system serves at least two User Equipment (UEs), the method comprising:

• obtaining channel estimates for channels to said served UEs;
• receiving, from at least one preceding first APU, effective channels from said served UEs to said preceding first APU;
• and
• determining a receive combining filter based on the obtained channel estimates and the received effective channels from said at least one preceding first APU, wherein the receive combining filter is going to be applied to received data signals.

A first Antenna Processing Unit (APU) for sequential receive combining in a radio stripe system, wherein the radio stripe system comprises at least two APUs and a Central Processing Unit (CPU), the at least two APUs being connected in series to the CPU, wherein the radio stripe system serves at least two User Equipment (UEs), the first APU comprising:

• a processing circuitry;
• and
• a memory circuitry storing computer program code which, when run in the processing circuitry, causes the first APU to:
• obtain channel estimates for channels to said served UEs;
• determine a receive combining filter based on the obtained channel estimates, wherein the receive combining filter is going to be applied to received data signals;
• determine effective channels from said served UEs based on the obtained channel estimates and the determined receive combining filter, wherein the effective channels represent the effective channel created after the receive combining filter being applied to each channel for said served UEs;
• and
• transmit the effective channels from said served UEs to at least one subsequent second APU.

A second Antenna Processing Unit (APU) for sequential receive combining in a radio stripe system, wherein the radio stripe system comprises at least two APUs and a Central Processing Unit (CPU), the at least two APUs being connected in series to the CPU, wherein the radio stripe system serves at least two User Equipment (UEs), the second APU comprising:

• a processing circuitry;
• and
• a memory circuitry storing computer program code which, when run in the processing circuitry, causes the second APU to:
• obtain channel estimates for channels to said served UEs;
• receive, from at least one preceding first APU, effective channels from said served UEs to said preceding first APU;
• and
• determine a receive combining filter based on the obtained channel estimates and the received effective channels from said at least one preceding first APU, wherein the receive combining filter is going to be applied to received data signals.