IDMA-based Resource Allocation Methods For Satellite Networks With Consideration On Channe Quality

Broadband satellite network is a typical system with power-limited andbandwidth-limited system. To make full use of the precious system resourceswhile ensuring the quality of all kinds of services, rational access control andresource allocation are effective ways to improve the resource utilization. TheInterleave-Division Multiple Access (IDMA) technology not only inherits thesuperiority of traditional CDMA technology such as excellent anti-jammingperformance and high spectrum efficiency but also adopts the iterativechip-by-chip multi-user detection (CBC-MUD) scheme to combat with inter-celland intra-cell multiple access interference (MAI). Meanwhile, multi-usertransimission with low computational complexity is feasible. Additionally,favorable multimedia service can be kept with heavy channel load. Consideringthe dynamic satellite channel and the limitation of traditional resource allocationscheme, an integrated resources allocation scheme considering satellite channelquality is proposed for the emerging satellite IDMA systems, which meets thequality of service (QoS) requirements corresponding to different priority levelsand adapts to the variation of satellite environment.Firstly, three classcial satellite channel models are simulated and analyzed.The system capacity expression of IDMA system based on Lutz model using theunique SINR evolution technique is derived and the influential factors to systemperformance are analyzed. Furthermore, the capacity and interferences of IDMAsystem under imperfect power control are illustrated, which provides referentialsuggestions for dynamic resource allocation and the adaptive management.Secondly, ARIMI model based on smoothing and feedback processing isproposed to forecast the practical environment. The predictions about satellitechannel of ARIMA model are real-time and well accurate. Moreover, a newmedium access control (MAC) protocol based on the channel quality predictionfor broadband IDMA satellite communication systems is proposed. By taking thesatellite channel prediction into account, the proposed IDMA MAC protocolmakes accurate estimation of available resource and achieves high throughput.Finally, a novel wide-band IDMA resource allocation scheme based onchannel quality estimation is proposed in this paper, consisting of channel qualityestimation, MAC protocol, dynamic power allocation algorithm, and calladmission control (CAC) scheme. Combining with the analysis of systemcapacity under imperfect power control, the effective rate adaptation algorithmand the minimum power allocation algorithm is exploited for multi-service IDMA systems. Given the above analysis, the CAC scheme based on channelquality estimation is further identified and improved to enhance the adaptiveability. Simulation results show that the proposed CAC scheme greatly improvesthe system resource utilization while satisfies well the QoS requirements ofvarious services. Furthermore, different scheduling policies of buffering queueare researched so as to balance the fairness between services and resourceutilization. Additionally, the system performance is verified by an integratedsimulation platform.