MIMO Exploitation of 3D Multipath Statistics in a Heterogeneous LTE-Advanced Network

Table 1

Parameters for LTE-A OFDMA.

System parameters	Specifications
Carrier frequency	2.6 GHz
Transmission bandwidth	10 MHz
Time slot/subframe duration	0.5 ms/1 ms
Subcarrier spacing	15 kHz
Sampling frequency	15.36 MHz (4 × 3.84 MHz)
IFFT size	1024
Number of occupied subcarrier	600
Number of OFDMA symbols; per time slot (short CP)	7
CP length (μs/samples)	(4.69/72) × 6, (5.21/80) × 1
Channel knowledge	Perfect
Subcarrier mapping scheme	Distributed
Channel coding	Turbo
𝑁SS,𝑁UE	2 × 2
MIMO	SM (closed-loop)
BS antenna spacing (Figure 3)	Pico: 𝜆,2𝜆,3𝜆; Macro: 3𝜆,5𝜆,10𝜆
UE antenna spacing (Figure 3)	0.5𝜆,𝜆,2𝜆