Effects of Relay Location and Transmission Power on Transmission Mode Selection in Cooperative Networks

[[abstract]]合作傳輸是一種有效傳輸功率的技術,具有多樣性和短距離優勢的通訊模式。 在論文中,我們開發聯合傳輸功率和中繼站位置設計的合作網路。 我們也探討傳輸模式 (TX-mode),傳輸功率和中繼站位置對功率消耗和傳輸模式選取的影響。 此外我們也開發傳輸模式 (TX-mode) 適合的方案,來為用戶選擇直接、中繼站和合作模式中選擇適當的傳輸模式 (TX-mode)。 為了實現節約能源和增強容量的目標,我們採用了共同判斷BS和RS的最佳中繼站位置和傳輸功率的優化方法,針對鏈路可靠性對能量效率的要求下最大限度提高電池容量和能量效率。 我們將方案與共同功率和中繼站位置設計上來進行比較,和唯一具有傳輸功率或中繼站位置設計的方案。 模擬結果表示,與其他兩種設計方案相比,具有共同最佳化設計的方案可以明顯提高能量效率。[[abstract]]Cooperative transmission is a power-efficient transmission technique, with the advantages of diversity and short-range communications. In this paper, we develop joint transmission power and relay location design for the cooperative networks. We investigate the impacts of transmission (TX) mode, transmission power, and relay location on the power consumption and transmission mode selection. Besides, we develop TX-mode adaptation schemes for the users to adaptively select a proper TX mode among the direct, relay, and cooperative TX modes. To achieve the goals of saving power and enhancing capacity, we apply an optimization approach to jointly determine the optimal relay location and transmission power of BS and RS; aiming to maximize energy efficiency under the cell capacity and link reliability requirements. We compare the scheme with joint power and relay location design, and the schemes with only transmission power or relay location design. Simulation results show that the scheme with joint optimal design can significantly enhance the energy efficiency, compared to the other two design schemes.[[note]]碩