| | Scheme | Type | Support | Order | |
| | Ternary 4-point [3] | Interpolating | 5 | 3 | 2 | | Ternary 4-point [4] | Interpolating | 5 | 3 | 2 | | Ternary 4-point [4] | Interpolating | 5 | 4 | 1 | | Ternary 4-point [5, 9] | Interpolating | 5 | 3 | 1 | | Ternary 4-point [7] | Approximating | 5.5 | 4 | 2 | | Ternary 4-point [14] | Approximating | 5 | 4 | 3 | | Ternary 4-point [15] | Approximating | 5.5 | 4 | 2 |
| | Ternary 4-point proposed | Approximating | 5.5 | 5 | 4 |
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