Hierarchical Precoding in a Realistic Ultradense Heterogeneous Environment Exceeding the Degrees of Freedom

Table 2

Simulation parameter.

Parameter	Value
Channel model	QUADRIGA [19]
Scenario	Macro BS: urban macro (C2); Small cell: urban mirco (B1)
Propagation	Non-line-of-sight
Large-scale fading	Geo-correlated parameters maps
Center frequency	2.6 GHz
Simulation type	Monte Carlo (500 runs)
Traffic model	Full buffer
Signal bandwidth	180 kHz per RB, 100 RBs
Intersite distance (macro)	500 m
Number of macro BSs	19 having 3 sectors each
Number of small cells	(1–10) per macrosector
; spacing	Macro: 4,8; ; small cell: 2;
Transmit power	Macro: 49 dBm; small cell: 26 dBm
BS height	Macro: 32 m; small cell: 5 m
Min. distance between macrocell and small cell	75 m
Min. distance between small cells	40 m
; spacing	2;
UE height	2 m
UE distribution	10 uniform in macrosector and around each small cell
UE placement	Min./max. distance to small cells: 10/40 m; Minimum distance to macro BS: 35 m
CSI at the transmitter	Perfect, imperfect