Throughput maximization of adaptive MQAM and the effects of inaccurate feedback channel estimation
- Resource Type
- Authors
- Pingzhi Fan; Junsong Xie
- Source
- Proceedings of the 8th International Scientific and Practical Conference of Students, Post-graduates and Young Scientists. Modern Technique and Technologies. MTT'2002 (Cat. No.02EX550).
- Subject
- Computer science
business.industry
Network packet
Link adaptation
Data_CODINGANDINFORMATIONTHEORY
Computer Science::Performance
Modulation
Adaptive system
Computer Science::Networking and Internet Architecture
Telecommunications
business
Throughput (business)
Algorithm
Quadrature amplitude modulation
Computer Science::Information Theory
Communication channel
Rayleigh fading
- Language
Based on the analysis of system throughput with fixed modulation for packet transmission in Rayleigh fading environment, optimal channel signal to noise ratio (SNR) switching thresholds for adaptive modulation with maximized throughput are obtained by assuming ideal feedback channel estimation. Significant throughput improvement is achieved and the packet size is shown to have strong effect on throughput performance. Next, based on the Gaussian distributed and uniformly distributed models of channel estimation error, throughput performance of adaptive MQAM with inaccurate feedback channel estimation is investigated. Results obtained show that throughput of the adaptive system is quite sensitive to channel estimation error when the metric of estimation error is larger than 3 dB.