Proposes a link adaptation and receiver design scheme for satellite-based Enhanced General Packet Radio Services (EGPRS) wireless networks. Rician flat fading is assumed for the satellite channel. Because there is no intersymbol interferences, so demodulator is one of the most important designs for receiver. The average signal and noise powers in one EGPRS burst is estimated using an unsupervised clustering method - fuzzy c-means (FCM). Based on the estimated signal level and noise standard deviation, link quality can be evaluated and a Bayesian demodulator is designed. Our demodulation scheme uses link adaptation results, which simplifies the system designs tremendously. Simulation results show that our link adaptation scheme works well and demodulator performs better than the block phase estimation demodulator with a gain of 0.2-0.3dB.