Table 1 Order of computation complexity for proposed TDE and conventional FDE methods
From: Time domain equalization method for TS-OFDM signal under higher mobile environments
Equalization methods with direct inverse matrix calculation | ||||
|---|---|---|---|---|
Methods | Removing ISI | Construction of channel matrix | Calculation of inverse | Equalization |
from TS | and received signal matrix | matrix | ||
MMSE-FDE [9] | N/A | O[ N 3+2N 2log2 N+N 2+Nlog2 N] | O[ N 3] | O[ N 2] |
OLA-MMSE-FDE [14] | O[ S 2−S] | O[ N 3+2N 2log2 N+N 2+Nlog2 N] | O[ N 3] | O[ N 2] |
FAST-MMSE-FDE [14] | O[ S 2−S] | O[ P 3+2SP 2+2P 2] | O[ P 3] | O[ P 2+N 2] |
Proposed TDE | O[ S 2−S] | O[ NS 2+NS] | O[ N 3] | O[ N 2+Nlog2 N] |
Equalization methods with complexity reduction algorithms | ||||
MMSE-FDE [10] | N/A | O[ (2Q 1+2)Nlog2 N+N(Q 1+1)2 | O[ 3N(Q 1+1)2] | O[ N 2] |
+N(Q 1+1)+Nlog2 N] | ||||
OLA-MMSE-FDE [14] | O[ S 2−S] | O[ Nlog2 N+3N] | O[ 2Q 2 Nlog2 N+(2Q 2+3)N] | |
FAST-MMSE-FDE [14] | O[ S 2−S] | O[ P 2+3P] | O[ N 2+(2Q 2+1)P 2+(2Q 2+3)P] | |
Proposed TDE | O[ S 2−S] | O[ NS 2+NS] | O[ 3NS 2] | O[ N 2+Nlog2 N] |