Sum-Rate Maximization Based on Power Constraints for Cooperative AF Relay Networks | ||
| Journal of Communication Engineering | ||
| مقاله 1، دوره 6، شماره 1 - شماره پیاپی 12، فروردین 2017، صفحه 1-25 اصل مقاله (835.32 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22070/jce.2017.1688.1003 | ||
| نویسندگان | ||
| Shahriar Shirvani Moghaddam* 1؛ Maryam Alibeigi2 | ||
| 1shahid rajaei | ||
| 2DCSP Research Lab., Shahid Rajaee Teacher Training University (SRTTU), Lavizan, 1678815811, Tehran, Iran | ||
| چکیده | ||
| In this paper, our objective is maximizing total sum-rate subject to power constraints on total relay transmit power or individual relay powers, for amplify-and-forward single-antenna relay-based wireless communication networks. We derive a closed-form solution for the total power constraint optimization problem and show that the individual relay power constraints optimization problem is a quadratic programming which does not have a closed-form solution. To solve it, we propose a closed-form and low-complex technique which introduces suboptimal solution as an upper bound of system sum-rate. The performance of two new proposed algorithms are evaluated in terms of average achievable sum-rate and energy efficiency in different signal to noise ratios (SNRs). Considering the effect of the number of relays, the effect of channel gains of the source-relay as well as the relay-destination, and also the impact of the level of imperfect CSI are investigated. According to simulation results, higher sum-rate can be achieved in total power constrained scenario for all SNRs but energy efficiency is approximately the same for both of them. In addition, higher sum-rate is achievable by increasing the number of relays and/or improving the quality of uplink and downlink channels as well as decreasing uncertainty of channels. | ||
| کلیدواژهها | ||
| Cooperative؛ MIMO relay network؛ AF relay؛ Beamforming؛ Power control؛ Sum-rate | ||
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آمار تعداد مشاهده مقاله: 721 تعداد دریافت فایل اصل مقاله: 1,067 |
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