This paper investigates the effective capacity of a point-to-point ultra-reliable low latency communication (URLLC) transmission over multiple parallel sub-channels at finite blocklength (FBL) with imperfect channel state information (CSI). Based on reasonable assumptions and approximations, we derive the effective capacity as a function of the pilot length, decoding error probability, transmit power and the sub-channel number. Then we reveal significant impact of the above parameters on the effective capacity. A closed-form lower bound of the effective capacity is derived and an alternating optimization based algorithm is proposed to find the optimal pilot length and decoding error probability. Simulation results validate our theoretical analysis and show that the closed-form lower bound is very tight. In addition, through the simulations of the optimized effective capacity, insights for pilot length and decoding error probability optimization are provided to evaluate the optimal parameters in realistic systems.
翻译:本文调查了在有限区段长度(FBL)和不完善的频道状态信息(CSI)的多平行小通道上,点到点超可靠低潜伏通信的有效传输能力。根据合理的假设和近似值,我们从试验长度、解码误差概率、传输电力和子通道号的函数中得出有效能力。然后我们揭示了上述参数对有效能力的重大影响。产生了有效能力的封闭式下限,并提出了基于交替优化算法,以找到最佳试验长度和解码误差概率。模拟结果验证了我们的理论分析,并表明封闭式下限非常紧。此外,通过模拟最佳有效能力,提供了试验长度和解码误差概率优化的洞察力,以评价现实系统中的最佳参数。