5 Reduce one or both stages of dec/interp to max rate of 8 instead of 16
6 Optimize CICs to minimize registers
7 Reduce width of RX CORDIC
8 Fix CORDIC wasted logic cells from bad synthesis
9 Progressively narrow x,y,z on CORDIC
10 16-bit wide FIFOs, split IQ/channels on other side (?)
14 Halfband filter in Spartan 3
21 Capture/Transmit straight samples (no DUC/DDC)