Have a look at the CC1101, lots of cheap modules available, supports 2FSK, GFSK, 4FSK, ASK, OOK and MSK modulations, FEC, data whitening, manchester encoding and data rates ranging 0.6 - 500Kbps. However most modules only work at around 433MHz. For FSK modulations you will also need to know the frequency deviation. Bandwidth will also effect things, too narrow and it won't be able to pick up the entire transmission, too wide and it may pick up multiple transmissions.