Abstract
Studies on future advanced mobile and personal satellite communications using Ka-band or millimeter wave frequencies are started in USA, Europe and Japan. Advantages to use such higher frequencies are much wider available frequency bandwidth and substantial system size reduction. On the other hand, we have to overcome such disadvantages as significant rain attenuation, larger Doppler shifts, higher RF component losses, larger phase jitters, etc. As rain attenuation compensation techniques, several methods such as uplink power control, site diversity, and adaptive control of data date or forward error correction 'have been proposed. In this paper, we propose a TDMA system that can compensate rain attenuation by adaptive control of transmission rate, To evaluate the performance of this TDMA system, we carried out three types of experiments: experiments using a Japanese CS-3 satellite with Ka-band transponders, in-house IF loop-back experiments, and computer simulations. Experimental results show that this TDMA system has advantages over the conventional constant-transmission-rate TDMA system, as resource sharing technique, in both communication performance and system capacity.
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