Suboptimal Greedy Power Allocation Schemes for Discrete Bit Loading

Figure 1

Subchannel grouping into 𝐾+1 QAM groups based on their SNRs in (8) and step (3) of Section 2.2 for (a) a multicarrier system and (b) an ordered multicarrier system or a SVD-based MIMO system.

(a)

(b)