Efficient adaptive coding scheme in mobile satellite communication channel

The introduction of global mobile personal communications by satellite (GMPCS) systems makes it possible to provide high-quality services, especially by using low Earth orbit (LEO) or medium Earth orbit (MEO) satellites. In mobile satellite communication systems such as GMPCS systems, error correcting coding schemes are needed to achieve a desirable quality of service, and the coding scheme should be efficient in terms of the frequency spectrum as well as the power. Efficient coding schemes which employ trellis decoding methods with Reed-Solomon (RS) codes are proposed. These schemes can be used adaptively in time-varying fading conditions of mobile satellite communication channels. Simulations have been performed using a mobile satellite channel model as well as using an additive white Gaussian noise (AWGN) channel model. The results showed that the proposed schemes can achieve a better performance with less decoder complexity than a rate 1/2 constraint length 7 convolutional code in any fading environment