Figure 5From: Design Criteria for Hierarchical Exclusive Code with Parameter-Invariant Decision Regions for Wireless 2-Way Relay ChannelHDFD decision regions' shape example (real-valued 2-dimensional example codebook). Note that some boundaries lie inside the decision region corresponding to one hierarchical codeword (given by the same region colour). Such boundaries do not affect the final decision region's shape, and hence can be considered as "masked".Back to article page