Table 1 Simulation parameters setting

The number of antennas at the transmitter (N_T)

16

The number of desired users (M)

2

Total signal bandwidth (B)

5MHz

Total transmit power (P)

1W

Power allocation factors \(\left (\left \{\alpha _{1}^{2},\alpha _{2}^{2}\right \}\right)\)

{0.5,0.5}

Desired users positions

(45^∘,300m),

\(\left ({\left (\theta _{d_{1}},R_{d_{1}}\right),\left (\theta _{d_{2}},R_{d_{2}}\right)}\right)\)

(120^∘,600m)

Central carrier frequency (f_c)

3GHz

Subcarriers number (N)

1024

Signal-to-noise ratio(SNR)

15dB

The maximal observe range of the angle distance (θ_max,r_max)

180^∘,1000m

The maximal estimation error (Δθ_max,Δr_max)

6^∘,50m