Title :
Tight Bounds for Ergodic Capacity of Cooperative Relaying over Rayleigh Fading Channels
Author :
Yue Zhang ; Feng Ke ; Suili Feng ; Xianfei Zhu
Author_Institution :
Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China
Abstract :
In this letter, a closed-form expression for the exact ergodic capacity of decode-and-forward (DF) systems is derived. Since the closed-form expression includes exponential integral functions and is not mathematically tractable, we simplify the expression by using Taylor series to obtain the lower and upper bounds of the ergodic capacity. However, the bounds may be loose in low signal-to-noise ratio (SNR). Integral inequalities are applied to get tighter bounds. The simulation results also show that our closed-form bounds match perfectly with the exact ergodic capacity in moderate and high SNR.
Keywords :
Rayleigh channels; channel capacity; cooperative communication; decode and forward communication; functions; integral equations; relay networks (telecommunication); DF systems; Rayleigh fading channels; Taylor series; closed-form expression; cooperative relaying; decode-and-forward systems; exact ergodic capacity; exponential integral functions; integral inequalities; low signal-to-noise ratio; Approximation methods; Fading; Relays; Signal to noise ratio; Taylor series; Upper bound; Wireless communication; Decode-and-forward (DF); Ergodic capacity; Rayleigh fading;
Conference_Titel :
Computational Intelligence and Communication Networks (CICN), 2014 International Conference on
Print_ISBN :
978-1-4799-6928-9
DOI :
10.1109/CICN.2014.77
