کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
704138 891224 2015 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Joint optimization of spectrum and energy efficiency in cognitive radio networks
ترجمه فارسی عنوان
بهینه سازی مشترک طیف و بهره وری انرژی در شبکه های رادیویی شناختی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی کنترل و سیستم های مهندسی
چکیده انگلیسی

In this paper, we discuss the joint improvement of the energy efficiency (EE) and the spectrum efficiency (SE) in OFDM-based cognitive radio (CR) networks. A multi-objective resource allocation task is formulated to optimize the EE and the SE of the CR system simultaneously with the consideration of the mutual interference and the spectrum sensing errors. We first exploit the EE–SE relations and demonstrate that the EE is a quasiconcave function of the SE, based on which the Pareto optimal set of the multi-objective optimization problem is characterized. To find a unique globally optimal solution, we propose a unified EE–SE tradeoff metric to transform the multi-objective optimization problem into a single-objective one which has a D.C. (difference of two convex functions/sets) structure and yields a standard convex optimization problem. We derive a fast method to speed up the time-consuming computation by exploiting the structure of the convex problem. Simulation results validate the effectiveness and efficiency of the proposed algorithms, which can produce the unique globally optimal solution of the original multi-objective optimization problem.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Digital Communications and Networks - Volume 1, Issue 3, August 2015, Pages 161–170
نویسندگان
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