Performance Improvement on Nonorthogonal Multiple Access without CSIT

Table 1

Squared distance values for QPSK signal sets.

No.	(, )	Number of equal values
1		32
2		32
3		16
4		16
5		16
6		16
7		16
8		16
9		8
10		8
11		8
12		8
13		8
14		8
15		8
16		8
17		4
18		4
19		4
20		4