원문정보
초록
영어
In this paper we provide an adaptive modulation approach that uses adaptive pilot symbols which both pilot spacing and power allocation on pilot symbols are optimized in single input multiple output systems to maximize the spectral efficiency. The maximization is performed in the presence of imperfect channel state information at the transmitter. Also for reduce the computational complexity we propose a new method based on the curve fitting to find optimum power allocation on symbols. We provide closed forms expression for average spectral efficiency and average bit error rate over Rayleigh fading channel. Numerical results show the accuracy of our new method and demonstrate that our adaptive system outperforms other traditional systems that use of non-adaptive pilot symbols with single antenna based on spectral efficiency performance measure.
목차
1. Introduction
2. System Model
3. BER in the presence of channel prediction errors
4. ASE and average BER and outage probability
4.1. ASE computation
4.2. Average BER computation
4.2. Outage probability computation
5. New method to find optimum power allocation α
6. Numerical results
7. Conclusion
8. Appendix
9. Acknowledgment
10. References