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A Matlab/Octave SimulationWorkbench for

Multi-Antenna Software Defined Radio

Svante Signell, Jinliang Huang

Electronic System Design and RaMSiS

Department of Electronic, Software and Computer Systems (ECS)

School of ICT

KTH - Royal Institute of Technology

Stockholm, Sweden

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Svante Signell, Jinliang Huang KTH/ICT/ECS 2

Outline

Background & Motivation

System Model

File Structure

Case Study

A newer version

Future work

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System Model

File Structure

Case Study

A newer version

Future work

Outline

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What do we have...

A multitude of wireless and wireline standards: GSM

900/1800/1900/GPRS/EDGE, WLAN a/b/g/n, WCDMA

HSPA/B3G, WiMax fixed wireless/mobile, 4G, VDSL2,

Bluetooth2, RFID, UWB, etc

Wireless channel fading, co-channel and adjacent

channel interference, path loss etc

Wireline channel near and far end cross-talk, path

loss etc

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Background & MotivationWhat do we have...



HSDPA/B3G, WiMax fixed wireless/mobile, 4G, VDSL2,


Wireless channel fading, co-channel and adjacentchannel interference, path loss etc


loss etc

What do we want... Compatible and reconfigurable systems

Adaptive systems, depending on channel conditions,customer requirements etc

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Background & MotivationWhat do we have...



HSDPA/B3G, WiMax fixed wireless/mobile, 4G, VDSL2,


Wireless channel fading, co-channel and adjacent

channel interference, path loss etc


loss etc

What do we want...

Compatible and reconfigurable systems

Adaptive systems, depending on channel conditions,customer requirements

***** Software Defined Radio SDR *****

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TX RXpreambler

A reconfigurable adaptive system


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TX RX



Est H

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TX RX



feedbackAdaptiveSystem

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TX RXdata



Adjustrate/power with

feedback CSI

CSI: Channel State Information

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System Model

File Structure

Case Study

A newer version

Future work

Outline

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System Model

Goals: Make a reconfigurable workbench that supports

different standards and algorithms

Adaptive systems that maximize data rateunder a certain target BER

Monte-Carlo simulation to get average results

loop over different SNR points

loop over a large number of channel realizations

random source data bits

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Module blocks

Sub-Module blocks

System Model

Solution:Split functionality into generic function blocks

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Setup Run

Wrapup

done? No

Yes

System Model

System Setup:prepare the

parametersWraup and calculate

the results, e.g. BER,

SNR, throughput, etc

Transmit & receivedata, log the

information, such as:

source data bits,

received bits, etc.

Control flow for Monte-Carlo Simulation

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Modules SOURCE: Generate data bits or extract data bits from

pictures, videos, audio files etc.

TX: Preprocess the signal and prepare for transmission.

CH: Generate channel and calculate the received signal. RX: Postprocess the signal and detect the transmitted bits.

Reconstruct the pictures, videos, audio files etc.

SINK: Compute and show simulation results, in table format

and/or graphically.

System Model

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Sub-Modules

TX/RX Bit Processing Unit (BPU_T/R), e.g. encoder, interleaver.

Symbol Processing Unit (SPU_T/R), e.g. modulator, precoder.

Digital Radio Unit (DRU_T/R), e.g. FFT, interpolation, DAC.

Analog Radio Unit (ARU_T/R), e.g. IF2RF, PA, filtering

Estimation and Adaptation Unit (EAU_T/R), e.g. channel

estimation, adaptive power allocation , bit-loading

System Model

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Sub-Modules

CH

Forward channel (FCH)

Reverse channel (RCH)

Generate channel (GCH)

Estimate channel (ECH)

System Model

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ModelsCalled by Modules/Sub-modules to perform the basic signal

processing. Includes a default parameter file.

Common interface[outData, model_d, model_s] = model (phase, model_d, model_s, inData)

Generic parameters

stored in the corresponding .ini file:

System Model

scrambler.ini

% Generating polynomialpolynomial=[1,0,0,1,0,0,0,1]% Frame counterframeCounter = [0,1,0,0]

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System Model

File Structure

Case Study

A newer version

Future work

Outline

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File Structure

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First alpha release available(1.0alpha1)

Implemented standards: 802.11a,b,g,n

Ongoing: GSM, VDSL2, WiMAX, RFID

Planned: WCDMA, TDD-CDMA, DVB-

T/H/RCT, Bluetooth2, 4G

PC/*NIX+Matlab/Octave: least commondenominator, coding rules, templates

Licence: GNU General Public License

version 2 or later: TBD

Current status

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System Model

File Structure

Case Study

A newer version

Future work

Outline

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Case Study

MIMO-OFDM to maximize data rate under target BER.

4 x 4

SVD,WF,STBC (GSTBC),BF

64 subcarriers with 48 used, 4 pilots and 12 zero carriers

Adaptive modulation using M-QAM with M={0,2,4,16,64}

Deterministic spatial-temporal channel model [1]

Target BER 0.1%

[1] Jinliang HuangA Matlab/Octave Simulation Environment for SDR with application to OFDM

and MIMO, Master thesis, IMIT/LECS, Royal Institute of Technology, Sweden, 2005.

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Case Study

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System Model

File Structure Case Study

A newer version of SDR_WB

Future work

Outline

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A newer version

New one... Two scenarios are simulated:

Non-adaptive systems&Adaptive systems

Adaptive systems may havepartial or full CSIT

Adaptive systems canminimize BER or maximizedata rate

Both Rayleigh and Ricean

fading are included Data length is flexible

Old workbench... One scenario is simulated:

Adaptive systems with fullChannel State Information(CSI) at TX

Full CSIT is used to maximizethe data rate

Only Rayleigh fading channel isconsidered

Data length is fixed

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A newer version

New workbench... Two scenarios are simulated:


Adaptive systems may havepartialor fullCSIT


Both Rayleigh and Ricean

fading are included Data length is flexible






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A newer version





Both Rayleigh and Riceanfading are included

Data length is flexible






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A newer version












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A newer version












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Scenario_Blind

Scenarios for non-adaptive systems

No DELAY

H(2)H(1)

CH Estimation Data Transmission

Block 2


CH Estimation DataTransmission CH

CH

DELAY

Block1

Block 1

channel_duration

chestimation_time block_length

channel_duration = block_length + chestimation_time ?

NOTE

Delay: if the RX usedoutdated CSI to detect

the signal

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Scenario_CSI

H(2)H(1)


CH Estimation F DataTransmission CH

CHCH Estimation Data Transmission

NOTE

F: feedback CSIScenarios for adaptive systems

No DELAY

DELAY

channel_duration

feedback_delay

channel_duration = block_length + chestimation_time... +feedback_delay ?

block_length

chestimation_time

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Data to be transmitted at one time is a block

Inside a block, data is packed intoframes

Data structures

Frame 1 Frame 1

Data Block transmitted at time n

Frame 2 Frame 2

Data Block transmitted at time n+1

frame_length block_length

block_length = frame_length x nr_frame

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System Model

File Structure

Case Study

A newer version

Future work

Outline

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Future work

Implement more algorithms and more

standards VBLAST, GSM, WCDMA, WiMAX,

DVB-T/H/RCT, VDSL2, RFID, 4G Add more channel models, e.g. 802.11

reference channel model Use preambler data and pilots for channel

estimation Add link layer functionality -> real applications Hardware implementation of BB functions in

FPGAs etc!

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Thank you for your attention!!

Questions?

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