Predictive relay-selection cooperative diversity in land mobile satellite systems

Abstract

Abstract-Cooperative diversity protocols promise a new dimension of diversity that provides better communication by engaging nearby relays in forming a 'virtual' array of antennas for combined signal transmission. The current incremental cooperative diversity algorithms incrementally select best relay(s) to cooperate based on the channel quality reported by the relays. However, the algorithms do not take into consideration the fact that the chosen best relay(s) at estimation may not always be best at the time of communication. This is due to the time delay between the relay selection and its transmission of signal (problem of outdated Channel Quality Information). To solve this problem, the concept of channel prediction is introduced and employed whereby each relay determines a predicted value of its Channel Quality Information (CQI) based on its past measurements. The paper therefore develops a novel predictive relay-selection (PRS) cooperative diversity model which seeks to improve Land Mobile Satellite (LMS) communication through prediction protocols. In the model, the chosen best relay is the one with the best predicted CQI value instead of the traditional outdated one. Performance analysis of outage probability and average bit error probability for the newly developed PRS cooperation shows that the PRS cooperation is better than direct and outdated CQI relay communication.

On the secrecy performance of integrated satellite‐aerial‐terrestrial networks

“…However, the obstacles, shadowing and masking between satellite and terrestrial terminals, often seriously affect the quality of the line‐of‐sight (LoS) communications and deteriorate the wireless transmission reliability. To improve the performance of SatCom under these adverse conditions, the relay technology has been widely used . On the other hand, the terrestrial fixed relay is limited with the deployment inefficiency and inflexibility in remote area and emergency environment and to users with important communication missions .…”