Data Transmission Over Mobile Satellite Channels

Mobile satellite channel id fading channel being both power and bandwidth limited. Trellis-coded modulation(TCM) is a class of new signaling techniques which achieves good power and bandwidth efficiency. In this paper, the performance of correlated shadowing Rice-Lognorinal fading channel is studied based on the characteristics of mobile satellite channel. The analysis is applied to three detection strategies: ideal coherent detection, differential block detection and pilot-tone aided detection. The results are very important in the theory and in the practice for spectrum efficiency over mobile satellite channel. The main results include: 1. Two class of mixed channel models are normalized. A ground of new channel model parameters with elevation angle of satellite channel are gotten from two single channel models. These parameters are useful to analyze the personal communication system performance of satellite mobile, which invokes the available analytical schemes of Rice-Lognormal fading channel. 2. First-order statistics of absolute and differential phase of a Rice-Lognormal fading process are examined. 3. A new scheme are given to estimate the fading rate and fading duration over Rice- Lognormal fading channel. 4. The simulation method in the paper is practical and agreement with shadowed Rice- Lognormal fading channel, which has been substantiated by means of computer simulation on the average bit error probability. 5. The maximum likelihood metrics are derived. The comparison is made between the maximum likelihood metric and Euclidean distance metric. 6. We analyze the impact of diversity reception on TCM satellite fading channel, including the effect on the TCM code feature, normalized Doppler frequency shift, the correlation characteristics of time and space, effectiveness of shadowing, the number of diversity branches, differential block length and cocbannel interference. The asymptotic behavior of diversity and power is studied. The optimization of pilot to signal rate for pilot-tone detection is gotten with the variance of the number of diversity branches. This work was supported by General Office of the State Radio Regulatory Commission.