Here’s&the&first&mobile&radio1telephone&(1924)!spagnolini.faculty.polimi.it/wp-content/uploads/NovelFronthauling.pdf ·...

Prof.U.Spagnolini Fronthauling waveforms for 5G systems

1Here’s the first mobile radio-‐telephone (1924)!

Courtesy of Rich Howard


2Centralized-‐Radio Access Network (C-‐RAN)


3Fronthauling in C-‐RAN

5G specs.MIMO 64 antennas, BwOFDM=100MHz, 256QAM Air-‐link datarate (MIMO 64x2): 15Gb/s (approx)

Digital IQ streaming (CPRI):2x100MHzx16x64x(10/8)=256Gb/s

CHANGE THE TRANSMISSION PARADIGM

15Gb/s (aggregated)

256Gb/s


4

CPRI

Front-‐hauling techniques (MU-‐MIMO64x(2x32))4

RoF(Radio over Fiber)

R-‐PWM(*)

(reflective PWM)

RoC(*)

(Radio over Cablee.g., Ericsson Radio DOT)

PWM(*)

(Pulse Width Mod.)

(*) Politecnico di Milano Proprietary

ADC E/O O/E BBUI&Q

(laser)

ADCE/O O/EBBU

I&Q(laser)

PWM-1E/O O/EBBU(laser)

PWMI&Q

ADC

PWM-1RSOA O/EBBU

PWMI&Q

ADC

source

RF/IF

~

ADCBBUI&Q

MIMO-‐RoC(*)

d≤100m

Ethernet,CAT5/6,cable(twisted,quad,cable)

PM→DM,

DM→PM…

…

1

Na

PhantomDmode,(7links)

7links

Analog,I&Q

256Gb/s

6.4GHz

100MHz (1antenna) but6.4GHz (no!)

6.4GHz (ok!)

15-‐20GHz

15-‐20GHz

IQ streaming specs.


5Pulse Width Modulation fronthaul [GCOM’15]

Fiber-optic fronthaulWDM PON network

RU

Antenna

SHRF to IF

PW-modulator

+-

BBU Digitalsignal

S/HIntegrate& dump

Quantizer

E/O

PW-demodulator

optical PWM signal

O/E

ONU CO

100MHz RF signal (approx 5 aggregated 20MHz LTE carriers)

100 [MHz] x 2.5 x 16 [bits/sample] x 10/8 = 5 Gb/s

I&Q (over)sampling

quantization coding

CPRI-equivalent data rate (1 antenna):

Principle: splitting of the sampling and the quantization between RU and BBU

Τ

τk

Τ

Here’s&the&first&mobile&radio1telephone&(1924)!spagnolini.faculty.polimi.it/wp-content/uploads/NovelFronthauling.pdf ·...

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