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You need to estimate the MIPS cost first. OFDM may need high speed IFFT and channel codec and other signal processing unite such as equalizer. So it is better to choose a very powerful one. ADI also have some DSPs like blackfin shark.
Uses digital circuits to achieve the RF module's function is a very interesting area.
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Digital design for still image processing like digital camera is very hot I think.
fpga vs asic
FPGA is not efficient in speed, area and power and it has special memory(dual port), multiplier and clock tree. So, after prototyping, you need to change them.
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