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At this moment, we are work with microwave relay system.
And i tryd to find modulators/demodulators... nothing...
At this moment, we are use Altera's FPGA.
At www.altera.com you find Constallation Mapper/Demapper Megacore.
That help you to create modulator/demodulator.
QAM mod/demod chips for 155 Mb do not exist at this moment as far as I know.
This would in practice require a very high constellation like 1024 QAM, which you do not like to have.. Needs very good transmission medium and low phase noise.
I think you have more luck in the range of WLAN OFDM chipsets although 155 Mb is a lot...