Overview

visual System Simulator™ (vSS) is complete and comprehensive software for the design of today’s complex communications systems. vSS technology provides engineers with the ability to design the right system architecture as well as formulate suitable specifications for each of the underlying components in communications designs.

Long Term evolution™ (LTe) is the next-generation mobile communication service

designed to increase the capacity and speed of mobile telephone networks.

LTe specifications define:

Downlink peak rates of at least 100 Mbps

Uplink of at least 50 Mbps

rAN round-trip times of less than 10 ms

An all-iP flat networking architecture

Scalable carrier bandwidths: 20 MHz to 1.4 MHz

Support for both FDD and TDD

Seamless communication with older technologies

The vSS LTe solution supports multiple inputs/multiple outputs (MiMO) and is

compliant with 3GPP* specifications:

3GPP TS 36.211 “Physical Channels and Modulation”

3GPP TS 36.212 “Multiplexing and Channel Coding”

3GPP TS 36.213 “Physical Layer Procedures”

VSS LTE test bench - shown with AWR Connected™

for Rohde & Schwarz featuring R&S®WinIQSIM2™ technology.

Visual System Simulator™

VSS for Long Term Evolution (LTE) Communications Design Solution

Visual System Simulator™

Visual System Simulator™

LTE Datasheet

*Contact us for the latest specs/standards supported

The vSS LTe solution keeps in mind the needs of the rF

engineer. vSS LTe downlink (DL) and uplink (UL) signal

sources have parameter settings that are self-explanatory.

rF engineers using vSS get quickly to the simulation work

at hand versus spending precious time manually setting up

signal sources.

Example VSS LTE DL user-defined parameters:

Average output power

Number of assigned resource blocks / channel

bandwidth

PDSCH: scrambling code, type and offset

PDCCH: scrambling code, type and offset

Modulation type: QPSK, 16QAM or 64QAM

Mapping mode / precoding mode: single antenna,

spacial multiplexing (2 or 4 antenna ports) or transmit

diversity (2 or 4 antenna ports)

in addition, vSS DL and UL sources are built from the

ground up as sub-circuits using easy to understand basic

building blocks. This enables baseband engineers to “drill

into” sources to verify and possibly modify physical layer

(PHY) 1 specifications.

Example VSS LTE UL user-defined parameters:

Average output power

Number of resource blocks / channel bandwidth

assigned to each user

Modulation type of each PUSCH: QPSK, 16QAM or

64QAM

BeNeFiTS

vSS allows rF/analog engineers, with minimal effort, to evaluate

LTe communication systems inclusive of the analog impairments

due to the rF chain. Having such capabilities allows designers

to reduce time-to-market by eliminating iterations and rework,

and cut system costs by ensuring that components are not

over-specified and needlessly expensive.

vSS’s LTe test benches can easily be configured to

simultaneously view:

error vector magnitude (evM) vs. input and/or output power

Complementary cumulative distribution function (CCDF)

Time domain waveforms

i/Q plot

Adjacent channel leakage ratio (ACLr) or adjacent

channel power ratio (ACPr)

Spectral emission mask

There is no need to start with complicated and difficult

to understand “test benches” in order to get critical

performance measurements. evM measurements can be

made on individual sub- carriers and/or over the entire

OFDM symbol. Adjacent channel interference analysis can

also be easily performed. Additionally, users of vSS can

extend simulation analyses to include a device under test

(DUT) in the laboratory via the use of Testwave™ software.

Awr’s Testwave software integrates T&M hardware into

vSS via GPiB, or LAN and is automatically handled by one

bi-directional vSS Testwave block. Through an easy-to-

understand, configurable parameter page, the desired

equipment is selected through its corresponding GPiB or

LAN address and controlled via GPiB string commands.

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VSS LTE DL source sub-circuit constructed from basic building blocks.

VSS LTE DL test bench.

LTE Datasheet

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ADvANTAGeS AT-A-GLANCe

verify hardware performance relative to system-level

specifications

Simulate various filter structures after amplification to

minimize ACPr

Simulate impairments of rF link prior to amplification

evaluate re-use of hardware

Debug through simulating or analyzing portions of

broken hardware

Drive PCB board/or module with same signal

Visual System Simulator

AWR Connected for Rohde & Schwarz

LTE Datasheet

SUMMArY

The vSS LTe communications library makes it possible

for rF/analog engineers to effortlessly evaluate LTe

communication systems. The LTe communications library

featured within vSS readily enables design exploration from

concept thru to final protoype board.

For example, verify evM/ACLr performance of the entire

rF front end or monitor the contribution of an isolated

component to the overall measurement, measure evM

over an OFDM symbol or of individual sub-carriers, and/or

interchange commercial of the shelf components (COTS) with

ideal behavioral models and/or circuit based models at each

level of the design process. Finally, take advantage of the Awr

LTe Connected Solution inclusive of Testwave to perform

simulations with actual DUT or prototype board to “close the

loop” of the design cycle.

Complete details of vSS LTe communications library specifics

are found on page 4.

• For additional information on vSS and vSS LTe Solutions,

visit: www.awrcorp.com/vss to obtain the vSS LTe

Connected Solution datasheet

• To view videos related to vSS, winiQSiM2 as well as LTe

visit: www.awr.tv

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Awr, 1960 east Grand Avenue, Suite 430, el Segundo, CA 90245, USATel: +1 (310) 726-3000 Fax: +1 (310) 726-3005 www.awrcorp.com

Copyright © 2010 Awr Corporation. All rights reserved. Awr, Awr logo and Microwave Office are registered trademarks and visual System Simulator, Testwave, Awr Connected and Awr.Tv are trademarks of Awr Corporation. LTe is a trade mark of eTSi. All others are property of their respective holders.

Visual System Simulator

vSS LTe COMMUNiCATiONS DeSiGN SOLUTiON DeTAiLS

MIMO Downlink Sources and Receivers Support Uplink Sources and Receivers Support Channel Coding

• FDD and TDD

• encoding for physical data channel (PDSCH)

• Physical control channels (PDCCH, P-SCH, S-SCH and reference signals)

• Full flexibility in resource block allocations

• Downlink signal source for 1, 2, or 4 antennas with pre-coder and layer mapping supporting spatial multiplexing and transmit diversity

• Downlink signal sources/transmitters for 1, 2 or 4 antenna ports

• FDD

• Support for multiple PUSCH channels

• SrS

• Full flexibility in resource block allocations

• Scrambler, modulation mapper, transform pre-coder for SC-FDMA

• Convolutional encoder

• viterbi Decoder

• CrC encoder

• CrC Decoder

• Scrambler

• DeScrambler

• DL Channel encoder

• DL Channel Decoder

• TurboCoder

• TurboDecoder

• DL Frame Assembler

• DL Frame Disassembler

• UL Channel encoder

• UL Channel Decoder

• UL Channel interleaver

• UL Channel Deinterleaver

MIMO PreCoder Modulation Source

• DL MiMO Precoder

• DL MiMO Layer Mapper

• DL MiMO Modulation Mapper

• DL MiMO Deprecoder

• DL MiMO Layer Demapper

• DL MiMO Modulation Detector

• DL Layer Mapper

• DL Modulation Mapper

• DL Precoder

• DL OFDM Modulator

• DL Layer Demapper

• DL Modulation Detector

• DL Deprecoder

• DL OFDM Demodulator

• DL MiMO Mapper

• UL Layer Mapper

• UL Layer Demapper

• UL SC-FDMA Modulator

• UL SC-FDMA Demodulator

• UL DFT (Transform precoder)

• UL iDFT (Transform deprecoder)

• DL 1Ant Source

• DL MiMO 2Ant Source

• DL MiMO 4Ant Source

• DL TX

• UL Source

Multiplex Receiver Signaling

• DL Frame Assembler

• DL Frame Disassembler

• DL OFDM Sym extract

• DL Slot extract

• DL MiMO DemuxCir

• UL Frame Assembler

• UL Frame Disassembler

• UL SC-OFDM Sym extract

• UL Slot extract

• DL 1Ant receiver

• DL MiMO 2Ant receiver

• DL MiMO 4Ant receiver

• DL receiver

• UL receiver

• PDSCH Generator

• PDCCH Generator

• P-SCH Generator

• S-SCH Generator

• DL reFSiG Generator

• PDSCH Scrambler

• PDCCH Scrambler

• UL PUSCH Generator

• UL reFSiG Generator

• PUSCH Scrambler

Sync Signal

• DL Pilot

LTE Datasheet

DS-LTe-2010.5.13