From: Performance of time reversal precoding technique for MISO-OFDM systems
System
Precoding factor
Receive SNR
lim ρ → + ∞ BER ¯
BER ¯ forN t =2
Exploited
diversity
MRT
H m , k λ m
∑ k = 1 N t | H m , k | 2 ρ
( 2 N t ) ! 2 2 N t + 1 ( N t ! ) 2 1 ρ N t
3 16 1 ρ 2
N t
EGT
e Φ H m , k N t
∑ k = 1 N t | H m , k | 2 ρ N t
No general closed form
1 4 1 ρ 2
TR
H m , k N t
∑ k = 1 N t | H m , k | 2 2 ρ N t
1 2 N t + 1 N t 2 ! N t ρ N t 2
1 4 1 ρ
N t 2