| Adaptive modulation, error control coding and power control are well-known techniques that have been applied to mobile wireless communication systems. These techniques, when designed to track the channel variations, yield a higher network throughput. In this research, we investigate the throughput returns due to the employment of various combinations of adaptive modulation, adaptive coding, and adaptive power control in a broadband fixed wireless access cellular system. We take into account the effects of shadowing, Multipath fading, and multiple access interference. The system considered is Multipoint Multichannel Distribution System (MMDS) with carrier frequency 2.5 GHz. We found that among all the possible combinations, the combination of adaptive modulation and adaptive coding (without power control) is the most efficient type since combining adaptive power control with the first two techniques adds a relatively small improvement in the throughput. |
