In order to guarantee the global communication, intersatellite links (ISLs) is a significant method in the satellites
constellations communication network. Two types are distinguished: Intraorbit ISLs and Interorbit ISLs. Interorbit ISLs
represent the biggest challenge in terms of ISL terminal implementation. This paper comes up with an optical solution to
interorbit ISLs which will offer the practical importance.
Turbo codes are used to guarantee the performance in the power-limited radio-optical communication system, but the traditional parallel structure is difficult to overcome the 'error floor'. In this paper, a hybrid structure is studied, it is the combination of the parallel structure and the serial structure. Turbo codes with the
hybrid structure can improve the system performance validly, but the complication is the cost. Through the theoretic analyses and computer simulation, the hybrid structure is proved to be valid.
In order to overcome fading in radio-optical communication channel, such as attenuation and optical intension twinkle, this paper introduces Turbo codes to improve the performance, although the results have a larger gap to Shannon's limit remains, the advantageous of using Turbo codes in a radio-optical communication environment is obvious and it can be put into practical use. In this paper we introduce a modified BCJR algorithm to adapt to the radio-optical channel.