On the effects of adaptive forward error correction mechanism in direct broadcast satellite networks
2nd ACM International Workshop on Modeling, Analysis and Simulation of Wireless and Mobile Systems, MSWiM 1999, Washington, Amerika Birleşik Devletleri, 20 Ağustos 1999, ss.25-32, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Doi Numarası: 10.1145/313237.313245
- Basıldığı Şehir: Washington
- Basıldığı Ülke: Amerika Birleşik Devletleri
- Sayfa Sayıları: ss.25-32
- Boğaziçi Üniversitesi Adresli: Evet
Özet
In wireless networks where channel conditions vary over time, forward error correction (FEC), if properly employed, may be an eflective mechanism to sustain throughput. In this paper we present an adaptive FEC mechanism, developed as part of an Adaptive Resource Allocation and Management (ARAM) algorithm, for use in Direct Broadcast Satellite (DBS) networks. The algorithm performs admission control and dynamically adjusts traJfic source rate and FEC rate to sati& quality of services (QoS) requirements. To analyze its performance, we have simulated the adaptive algorithm with varying traficjlows and channel conditions. The traffic model includes a variable bit rate (VBR) source model that represents MPEG traflc jluctuations while the DBS channel model is based on A WGN. As measures of performance, the simulator quantifies throughput and dropped frames due to congestion during transmission as well as QoS variations due to channel (FEC) and source (MPEG compression) rate changes. To show the advantage of the adaptive FEC mechanism, we present the performance results when the fied FEC rates are employed. The results indicate significant throughput and/or quality gains are possible when the FEChource pairs adjusted properly.