Joint Radar And Communication System Prototype Based on

Generalized Spatial ModulationDingyou Ma, Nir Shlezinger, Moshe Namer, Maxim Meltsin, Harel Moalem,

Eli Laks, Eli Shoshan, Xiqin Wang, Yimin Liu, Tianyao Huang and Yonina C. Eldar

Main Contributions

Proposed a Joint Radar andCommunication (JRC) scheme

The allocation of antennaelements are based on GSM.

Communication Subsystem:more bits can be conveyed.

Radar Subsystem: Improvedresolution compared to fixedallocation.

Communication and Radar Subsystem

Communication Subsystem

Spatial

bits

(0010)

00

01

10

11

Bits stream

RF

RF

Constel

lation

bis

(0 1)

-1

+1

Communication Subsystem: Generalized Spatial Modulation System (GSM)

Transmitter only. Bits Block: Spatial Bits +

Constellation Bits.

Radar Subsystem

GSM Phased Array Radar

Radar Subsystem: Phased array radar.

Transmitter and receiver. Transmit beamforming is

utilized.

JRC Design Rules

Separation in space and spectrum: Communication and

Radar are orthogonal in frequency spectrum. Coexistence.

Each antenna can transmit either radar or communication signal. Narrowband.

Generate Baseband

JRC Waveform

DAC, Up Converter, Transmit

Receive, Down

Converter, ADC

Communication

Detection

Radar Detection

GUI: Display

PC：MATLAB Hardware

PC：MATLAB

GUI: Parameter

Setting

Overview of the Prototype Architecture

Processing Algorithm

CommunicationSubsystem: Maximum likelihood Algorithm

Radar Subsystem: Radar works in search mode. Matched filter is utilized in each direction, then the peaks are found to determine the locations of the targets.

Graphical User Interface

Communication Result Radar Scenario Radar Matched Filter Result

Fixed Allocation Scheme GSM Based Scheme

Radar Estimation Result

Fixed Allocation Scheme GSM Based Scheme

Fixed allocation scheme

Comparison of the Fixed Allocation Scheme and the GSM Based Scheme

Fixed allocation: antenna allocationpattern is static.

Radar: the resolution is limited by the fixed allocation.

Communication: the degree of freedom in the spatial domain is not utilized.

GSM based scheme

-1

1

+1

+1

3

+1

+1

2

-1

4

GSM: antenna allocationbased on information bits.

Radar: approach full antenna array resolution. Spatial agility.

Communication: more bits can be conveyed. . Index modulation.

1 2

+1

+1

+1

-1

3 4

-1

-1

+1

+1

ReceiverTransmitter Antenna

Combine radar and communications. Benefits of joint design: reduced system

volume, reduced cost, mitigate the crossinterference.

Background

Radar

Commu

Overall of the Prototype

TransmitterReceiver

Controller