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Cell-free massive MIMO provides ubiquitous connectivity for multiple users,and implementation using radio stripes is very efficient. Compared withcollocated massive MIMO, the major cost includes fronthaul overheads and APhardware. Maximum ratio combination (MRC) achieves a low fronthaul loading andlow-cost AP, but the performance is bad. This letter proposes to implement aquasi-LMMSE (Q-LMMSE) processing using MRC fronthaul design. Q-LMMSE is derivedfrom a standard LMMSE, which gains interference information from MRC signal viasingular value decomposition. Simulation results show that the proposed Q-LMMSEincreases the spectral efficiency by several times using same MRC fronthaul.

LMMSE Processing for Cell-free Massive MIMO with Radio Stripes and MRC Fronthaul