A Cross Layer Optimization Based on Variable-Power AMC and ARQ for MIMO Systems

• 作者: Shu-Ming Tseng Wei-Shun Lei
• 来源期刊: 通讯、网络与系统学国际期刊(英文)
• 学科: 工学
• 关键词: TRANSMITTER POWER Control SPECTRUM Efficiency
• 年，卷（期）: 2010,（5）
• 页码范围: 488-493
• 页数: 6页
• 分类号: TN92

摘要

To improve spectrum efficiency (SE), the adaptive modulation and coding (AMC) and automatic repeat request (ARQ) scheme have been combined for MIMO systems. In this paper, we add variable power subject to power constraint in each AMC mode. We use KKT optimization algorithm to get the optimal transmit power and AMC mode boundaries. The numerical results show that the average SE is increased by about 0.5 bps/Hz for 2 ×2 MIMO systems with Nakagami fading with parameter m = 2 when SNR is around 15 dB and the ARQ retransmission is twice.