MIMO DFRC

STAGE 1: RADAR TARGET SEARCH AND COMMUNICATION CHANNEL ESTIMATION

A. Pilot Signal Generation Using Hybrid Structure

导频信号满足空间正交性

${{\mathbf{R}}{s}}=\frac{1}{T}{{\mathbf{S}}{DP}}\mathbf{S}{DP}^{H}=\frac{P}{{{N}{t}}}{{\mathbf{I}}{{{N}{t}}}}$

空间波形

${d\left( \theta \right)={{\mathbf{a}}^{T}}\left( \theta \right){{\mathbf{R}}_{s}}{{\mathbf{a}}^{*}}\left( \theta \right)=P,\text{ }\forall \theta }$

将信号矩阵分解为基带信号（baseband）和模拟预编码矩阵

${{\mathbf{S}}{DP}}={{\mathbf{F}}{RF}}{{\mathbf{S}}_{BB}}$

定义初始时刻的基带信号矩阵和模拟预编码矩阵

${\mathbf{F}{RF}^{1}={{\mathbf{1}}{{{N}{t}}}}\mathbf{1}{{{N}_{RF}}}^{T} }$

${{\mathbf{S}}{BB}}\left( :,1 \right)=\sqrt{\frac{P}{N{RF}^{2}{{N}{t}}}}{{\mathbf{1}}{{{N}_{RF}}}}$

t+1时刻迭代

$\mathbf{F}{RF}^{t+1}=\operatorname{diag}\left( \mathbf{u} \right)\mathbf{F}{RF}^{t}$

${{\mathbf{S}}{BB}}\left( :,t+1 \right)={{\mathbf{S}}{BB}}\left( :,t \right){{v}_{t}}$

$\mathbf{u}={{\left[ {{u}{1}},{{u}{2}},\cdots ,{{u}{{{N}{t}}}} \right]}^{T}}$

${{u}{n}}=\exp \left( \frac{j2\pi n}{T} \right),\text{ }{{v}{t}}=\exp \left( \frac{j\pi \left( 2t-1 \right)}{T} \right)$

仿真实验

B. Parameter Estimation After

C. Identifying Communication Channel Paths from Targets