论文标题
具有多个延迟约束的Powerline OFDM的能量最小化位分配
Energy-Minimizing Bit Allocation For Powerline OFDM With Multiple Delay Constraints
论文作者
论文摘要
我们为Powerline正交频划分多路复用（OFDM）提出了一个比特分配方案，该方案可最大程度地减少总限制和延迟约束的总发射能量。多个延迟要求源于发射器必须时期并发送到接收器的不同数据集。提出的位分配考虑了子渠道的通道功率与噪声密度比，以及在Powerline通信（PLC）通道中普遍存在的窄带干扰和冲动噪声的统计数据。所提出的方案具有1或2组数据最佳，并且具有超过2组数据的次优。但是，数值示例表明，所提出的方案执行接近最佳。同样，它在计算上的复杂程度不如最佳方案，尤其是在最小化大量数据集的总能量时。我们还将提出的方案与一些现有方案进行比较，发现当延迟约束数量较大时，我们的方案需要较少的总发射能量。
We propose a bit-allocation scheme for powerline orthogonal frequency-division multiplexing (OFDM) that minimizes total transmit energy subject to total-bit and delay constraints. Multiple delay requirements stem from different sets of data that a transmitter must time-multiplex and transmit to a receiver. The proposed bit allocation takes into account the channel power-to-noise density ratio of subchannels as well as statistic of narrowband interference and impulsive noise that is pervasive in powerline communication (PLC) channels. The proposed scheme is optimal with 1 or 2 sets of data, and is suboptimal with more than 2 sets of data. However, numerical examples show that the proposed scheme performs close to the optimum. Also, it is less computationally complex than the optimal scheme especially when minimizing total energy over large number of data sets. We also compare the proposed scheme with some existing schemes and find that our scheme requires less total transmit energy when the number of delay constraints is large.
