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Table 4 Four designs of precoder F and decoder G subject to either ATP or IAP constraint

From: Practical decentralized high-performance coordinated beamforming for both downlink and uplink in time-division duplex systems

  Approaches for designing precoder F and decoder G Constraint
PMMSE min G , F E Gy s F 2 = min G , F tr σ s 2 GHF I m GHF I m * + β G G * ATP (9a)
IAP (11a)
PMMI max G , F log G σ s 2 HF F * H * + β I r G * β G G * ATP (9a)
IAP (11a)
PMBER max G , F λ min σ s 2 F * H * G * β G G * 1 GHF ATP (9a)
IAP (11a)
PSVD SVD on H : H = T * with T = t 1 t c singular values are in decending order ATP (9a)
IAP (11a)