Scheme | Proposed scheme | Ref. [12] | Ref. [13] |
Transmission efficiency | 4 symbol/channel | 16/9 symbol/channel | 8/3 symbol/channel |
Diversity gain | 4 | 4 | 8 |
Feedback amount | No | Global CSI | Global CSI |
Decoding complexity | M2 | M | M2 |