高速铁路SFN MIMO信道模型：性能分析与应用

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URSI GASS, Montreal, 19-26 August 2017

SFN MIMO Channel Model for High-speed Railway

Jinmeng Zhao

, Lei Xiong

, Yu Zhang

, Ting Zhou

, Yuanchun Tan

1. State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China

2. Key Laboratory of Wireless Sensor Network & Communication, Shanghai Institute of Microsystem and Information

Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China

3. Beijing Xinwei Telecom Technology Group Co., Ltd, Beijing 100094, China

{lxiong}@bjtu.edu.cn

Abstract

A SFN MIMO channel model is proposed and analyzed

for high-speed railway SFN scenario in this paper.

Considering the influence of scattering components, every

tap of the modified SFN channel is Ricean fading channel.

Thus, this model combines the MIMO channel with the

modified SFN channel which fits actual high-speed

railway scenario. Based on the SFN MIMO channel

model, the MIMO architecture is studied and the

performance of the MIMO system is analyzed. The

simulation results show that the MIMO technology is still

applicable and the system throughput in the 2×2 MIMO

channel can be doubled compared to SISO when the

placement of antennas is perpendicular to the rail.

1. Introduction

In recent years, the demands and challenges for

communication in the high-speed railway is increasing.

Therefore, it is very important to carry out MIMO channel

simulation in high-speed railway scenarios as a part of

development of Long Term Evolution (LTE) system. In

view of LTE’s advanced network architecture, the MIMO

technique is introduced in the evolutionary process, but

there are not many MIMO channel models for high-speed

railway scenarios. The existing MIMO channel models

are not suitable for high-speed railway scenarios. In this

case, it is necessary to study the applicability of MIMO

technology in a specific scenario.

The high-speed railway scenario mainly has differences in

the aspects of propagation scenarios, coverage, and

Doppler frequency shift and so on. Compared with the

public mobile communication system, the high-speed

railway scenario has its unique characteristics: Radio

propagation environment is different: For example, in the

high-speed railway viaduct scenario, the scenario is more

open, having fewer obstacles, so the radio propagation

mode is LoS path-based, with less scattering components;

Different ways of coverage: Along the high-speed railway,

the base station is deployed along the railway status, and

it is linearly covered and close to the railway track (10-

50m); High-speed movement results in significant

Doppler frequency shift effect. Scenarios and channel

characteristics of high-speed railway communication

system are an indispensable part of the study. The

B3G/4G system uses a stochastic statistical channel model

based on geometry, such as SCM/SCME [1-2] and

WINNER model [3]. The WINNER defines 13 kinds of

scenarios consisting of the city micro-cellular, suburban

macro cell and so on [4-5]. In the RAN4 # 74 meeting of

3GPP TSG-RAN WG4, four scenarios were determined

to be used as the basic scenario for the research project

with a number of revisions written at # 77 TR [6].

This paper is organized as follows. Combining MIMO

model based on correlation matrix with SFN channel

model, a Modified Channel Model for SFN is described in

Section 2. Section 3 analyses the performance of the

system under SISO and MIMO conditions, such as the

efficiency (throughput). Section 4 concludes the paper.

2. Channel Models

2.1 MIMO model based on correlation matrix

A common technique for modeling multipath propagation

is assuming that arriving waves from similar directions

and delays are grouped into clusters [7]. Considering a

downlink MIMO link. The base station (BS) and the

mobile station (MS) use uniform linear arrays (ULAs)

with M and N antennas, which are assumed to be

omnidirectional. The transmitting signals are denoted by

the vector:

       

, ,...

s t s t s t s t





, where s

(t) is

the signal at the mth antenna port and [ ⋅ ]

denotes

transposition, Similarly, the receiving signals are

       

, ,...

y t y t y t y t





. The

 

MIMO



H

a broadband MIMO channel is represented as follows:

   

MIMO









(1).

where



is the lth path’s relative delay. A

describes the

connection between the MS and the BS of the lth path,

and it’s expressed as:

   

11 1

N NM













(2).

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