论文标题
基于媒体的调制中的多样性多重折衷和选择增益
Diversity Multiplexing Trade-off and Selection Gain in Media-Based Modulation
论文作者
论文摘要
基于媒体的调制(MBM)的想法是将信息嵌入传输介质(频道状态)的变化中。 MBM使用$ W $ RF墙壁的RF关闭,为端到端频道创建一组$ 2^w $ select-able状态。每个状态代表MBM星座点的索引。在每个状态下,从传输天线发出的波(音调)会在RF闭合内发生许多伪随机反射。 RF信号最终离开RF闭合后,进一步在丰富的散射环境中传播到接收器。这会导致每个接收天线的独立复合通道增益。结果,不同MBM星座点的坐标(由接收到的天线形成的通道增益的向量)将彼此独立。这与传统传输方案不同,在该方案中,在发射机上使用的固定星座结构将乘以固定但随机的通道增益。由于这种独立性,MBM提供了多种优势与遗留系统,包括“多个接收天线的信息添加性(无论发射天线的数量如何)和“静态褪色渠道上的固有多样性”。这项工作研究了MBM星座的多样性多样化的权衡。提供了分析表达式,证明了MBM与旧系统的优势。特别是,$ 1 \ times n_r $ simo-mbm星座配备了MDS代码(即使有相对较小的代码长度)明显优于$ N_R \ times n_r $ legacy mimo。
The idea of Media-based Modulation (MBM) is to embed information in the variations of the transmission media (channel states). Using an RF closure with $w$ RF walls, MBM creates a set of $2^w$ select-able states for the end-to-end channel. Each state represents an index of an MBM constellation point. In each state, the wave (tone) emanating from the transmit antenna experiences many pseudo-random back-and-forth reflections within the RF closure. The RF signal, upon finally leaving the RF closure, further propagates in the rich scattering environment to reach the receiver. This results in an independent complex channel gain to each receive antenna. As a result, coordinates of different MBM constellation points (vectors of channel gains formed over received antennas) will be independent of each other. This is unlike legacy transmission schemes where a fixed constellation structure used at the transmitter will be multiplied by a fixed, but random, channel gain. Due to this independence property, MBM offers several advantages vs. legacy systems, including "additivity of information over multiple receive antennas (regardless of the number of transmit antennas)", and "inherent diversity over a static fading channel". This work studies the Diversity-Multiplexing Trade-off of an MBM constellation. Analytical expressions are provided that demonstrate the advantages of MBM vs. legacy systems. In particular, it is shown that a $1\times N_r$ SIMO-MBM constellation equipped with an MDS code (even with a relatively small code length) significantly outperforms an $N_r\times N_r$ legacy MIMO.