Keysight Technologies 89601B/BN-B7Xliterature.cdn.keysight.com/litweb/pdf/5990-6393EN.pdfTechnical...
Transcript of Keysight Technologies 89601B/BN-B7Xliterature.cdn.keysight.com/litweb/pdf/5990-6393EN.pdfTechnical...
Technical Overview
Keysight Technologies
89601B/BN-B7X TD-SCDMA Modulation Analysis
89600B Vector Signal Analysis Software
2
Table of Contents
Key Features .....................................................................................................2
TD-SCDMA Modulation Analysis ................................................................3
Analysis and Troubleshooting ......................................................................4
Software Features ...........................................................................................8
Key Specifications ...........................................................................................11
Ordering Information ......................................................................................13
Additional Resources .....................................................................................14
Key Features
– Analyze downlink and uplink signals, all modulation formats:
QPSK, 16QAM, HSDPA/8PSK/64QAM
– Choose the analysis level you need: timeslot, composite, or code channel/layer
– See CDE and CDP results for composite signal or speciied code layer – Get a 20:20 view of the entire signal using 20 traces, sized the way you want,
each with 20 markers
– Evaluate your error budget at baseband, IF, and RF
3
Troubleshoot and analyze TD-SCDMA
modulation and RF performance with
Option B7X for Keysight Technology’s
89600B vector signal analysis (VSA)
software. One of a family of options
for the 89600B VSA software, this
analysis package includes the 3GPP
N-TDD 1.28 Mcps version of TD-
SCDMA, including HSDPA (16QAM,
64QAM, and 8PSK).
Option B7X demodulates HSDPA
16QAM and 8PSK modulated code
channels, with automatic detection
of code channel modulation type,
including manual override and auto-
matic detection of multiple mid-am-
ble shifts. Get maximum visibility into
the signal with single code domain
layer or composite power and code
domain displays. Normalize code-
domain power to display code domain
power relative to total signal power.
Make automatic measurements of
rho, EVM, frequency error, I/Q offset,
I/Q skew and more.
TD-SCDMA is just one of over 70 sig-
nal standards and modulation types
for which the 89600B vector signal
analysis (VSA) software creates a
window into what’s happening inside
your complex wireless devices. The
89600B tools provide views of virtu-
ally every facet of a problem, helping
you see the “why?” behind signal
problems. Whether you’re working
with emerging or established stan-
dards, Keysight’s industry-leading
89600B VSA software helps you see
through the complexity.
Try before you buy!
Download the 89600B software and use it free for 14 days to make
measurements with your analysis hardware, or use our recorded demo
signals by selecting File > Recall > Recall Demo > TD-SCDMA > on the
software toolbar.
Request your free trial license today:
www.keysight.com/ind/89600B_trial
TD-SCDMA Modulation Analysis
TD-SCDMA technology overview
Time division-synchronous code
division multiple access (TD-SCD-
MA) combines FDMA and CDMA
technologies. Unlike W-CDMA and
cdma2000® technologies, this TDD
standard transmits and receives on
the same frequency, which greatly in-
creases spectrum eficiency. Because TD-SCDMA effectively handles sym-
metrical and asymmetrical trafic, it is ideal for data-intensive applications,
such as mobile internet access and
multimedia applications. TD-SCDMA
was proposed by the China Wire-
less Telecommunication Standards
group (CWTS) and approved as a 3G
technology by ITU in 1999. The TD-
SCDMA standard is fully supported
by 3GPP and the China Communica-
tion Standards Association (CCSA).
The 3GPP TD-SCDMA standard is
also known as the low chip rate (LCR)
option of TDD, which is included in the
3GPP Universal Terrestrial Radio Ac-
cess (UTRA) as the UTRA-TDD option.
4
Analysis and Troubleshooting
Gain insight into your signal with 20:20 visibility
The 89600B VSA software proiles the signal’s power over time with
up to 20 traces with 20 markers
each, allowing you to look at overall,
composite, and layer performance,
simultaneously. An error summary
table provides detailed pilot phase
coding information and individual
timeslot error data, with chip timing,
total power, midamble power and
data ield power error information. Compare all these values at base-
band, IF, and RF.
View overall, composite, and layer data. The Overall Time trace, which provides an arrow to indicate
the uplink/downlink status of each timeslot, shows timeslot 6 selected. IQ constellations for the layer
and composite signals appear in Traces E and C.
Insightful display formats help characterize signals. Here, a captured signal has been replayed using
overlap processing to effectively “slow it down.” The cumulative history display format (Trace B),
highlights signal performance over very long periods.
5
Review your signal’s performance with CDE and CDP data
Code domain error (CDE) and code
domain power (CDP) results are avail-
able for the layer or the composite
signal in either averaged or instan-
taneous value form. The CDE of a
particular code channel is a measure
of the error power in a code channel
relative to the total signal power. CDP
is an analysis of the distribution of
signal power across the set of code
channels normalized to the total
signal power. Together they provide
key insight into the performance of a
TD-SCDMA system.
CDE and CDP data is shown in a multi-color format that assigns a unique color to each active code
layer, for easy visual identiication. Markers on the composite trace help with the identiication of code layers.
Dynamic Help quickly links you to the explanation of a menu or trace. Here, it provides information on
the Channel/Layer tab where you can select the desired despread channel and CDP code layer that
you would like to display.
6
Get a clear view of composite signals
Composite denotes trace data results
for the composite signal, which in-
cludes all spread code lengths (sym-
bol rate) and code channels. These
measurements, useful for evaluating
the overall in-band performance of
the signal, include: composite code
domain power (CDP) and composite
code domain error (CDE), as well as
time domain measurements such as
rho, EVM, EVM spectrum, and EVM
time.
Detailed error information on the composite signal performance of a single timeslot provides the
next layer of powerful troubleshooting. Note that for error traces with time (chips) on the x-axis, the
midamble location is denoted.
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Open a window into your signal with channel analysis
The 89600B lets you look at your
signal one channel at a time. Specify
the code channel and spread code
length to uniquely specify a channel,
and you can look at its IQ trajectory
and errors over time. Detailed chan-
nel error summary data provides both
bit demodulation and detailed overall
error measurements.
The Channel Error Summary table provides detailed modula-
tion quality statistics for a selected channel/layer. Phase
and Magnitude Error traces are available to examine error
over time. Use the Channel/Layer tab of the Demodulation
Properties tab to select a despread channel.
89600B VSA is the industry-leading measurement software for evalu-
ating and troubleshooting wireless signals in R&D. PC-based and sup-
porting numerous measurement platforms, the 89600B provides the
lexibility and sophisticated measurement tools essential to inding and ixing signal problems.
X-Series advanced measurement applications provide embedded
format-speciic, one-button measurements for X-Series analyzers. With fast measurement speed, pass/fail testing and sim-
plicity of operation, these applications are ideally suited for design
veriication and manufacturing.
www.keysight.com/ind/X-Series_Apps
Choosing between 89600B VSA software and X-Series measurement applications
8
Software Features
Signal acquisition
Result length 1 to 8 subframes maximum. Value hardware dependent
Start boundary Sub-frame, 2 frames
Time reference Trigger point, downlink pilot, uplink pilot
Samples per symbol
(code channel results)
1
Samples per chip
(composite results)
1
Triggering Single/continuous, external
Measurement region Analysis timeslot selectable within irst sub-frame
Signal playback
Result length 1 to 8 subframes maximum. Value hardware dependent
Capture length (gap-free analysis at 0%
overlap at 1.6 MHz span)
Capture length is hardware dependent. See hardware speciications for more information.
Format
Standards supported 3GPP TDD 1.28 Mc/s option, Release 5.0.0, December 2003
Formats Downlink, uplink
Single-button presets 3GPP N-TDD 1.28 Mcps
Modulation formats QPSK, 16QAM, HSDPA/8PSK/64QAM
Adjustable parameters
Format parameters
Chip rate Continuously adjustable
Filter alpha Continuously adjustable between 0.05 and 1.0
Enable HSPA/8PSK
Code/ID parameters
Downlink pilot sequence 0 to 311
Uplink pilot sequence 0 to 2551
Scramble sequence 0 to 1271
Basic midamble sequence 0 to 1271
Midamble autodetect Detects midamble code ID and sets Basic Midamble and Scrambling Code IDs (when in Mid-
amble subframe synchronization mode)
Max users (selectable for each timeslot) 2, 4, 6, 8, 10, 12, 14, 16
Force code group settings
Downlink pilot Downlink pilot code ID acts as master to determine the Code Group states. Non-standard code
ID sequence allocations also allowed via Code Group check boxes.
Any code User-selected Code ID (downlink pilot, uplink pilot, scramble or basic midamble) determines
master for Code Group states
1. Value dependent on Force Code Group settings.
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Channel/layer parameters
Despread channel parameters Speciies the timeslot and code channel with spreading factor that is used for the channel measurement data results
Spread code length (despread
channel)
Used along with the Despread Channel Code Channel to specify the active code layer and
channel used for the channel trace data measurement results
Code channel (despread
channel)
Used along with the Despread Channel Spread Code Length to specify the active code channel
and layer used for the channel trace data
CDP layer parameters Speciies the active (displayed) code domain layer for the CDP layer and CDE layer trace data
Spread code length (despread
channel)
Selects the active code domain layer (Spread Code Length) for the CDP Layer trace data
Modulation scheme parameters Speciies how the modulation type used for demodulation is detected
Auto-detect for all code
channels
Tests all code channels for SF1 and SF16 for modulation formats QPSK and 16QAM, then per-
forms analysis based on the detected modulation format (HSPA/8PSK only)
Manual Speciies the parameters that determine the TD-SCDMA Modulation Scheme used in the signal analysis: SF “Spread Factor”, Chan and Mod Type
Time parameters
Result length Determines the signal capture length in terms of sub frames for used for demodulation and
signal analysis
Time reference Speciies the time reference used to compute the Overall Error Summary - Timing Error data results
Start boundary Speciies when to start the Result Length data capture
Uplink switch point Speciies which Trafic TimeSlots are uplink and which are downlink
Analysis timeslot Speciies which sub-frames timeslot, within the selected Analysis Sub-frame, is used for analy-
sis and trace data measurement results
Analysis sub-frame Speciies which sub-frame, within the acquired Result Length, is used for analysis and trace data measurement results
Advanced parameters
Active slot threshold Sets the active slot detection threshold a value dB below the slot with the largest measured
power
Subframe synchronization Pilot, midamble
Slot frequency reference Pilot, midamble
Active channel threshold Sets the threshold above which a code channel is detected active and included in the Compos-
ite Reference waveform (auto, manual)
Normalize IQ traces Applies trace data normalization to the trace data results
Mirror frequency spectrum Correctly demodulates frequency spectrums that are mirrored (lipped) about the center frequency
Include IQ offsest in EVM Controls whether the Composite IQ Offset is included Composite EVM data result
Show raw QPSK symbols Affects the Composite Symbols display pilot bits or midamble bits, depending on which times-
lot is the Analysis TimeSlot
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Measurement results
Composite All code channels at once or all symbol rates taken together.
IQ measured Time, spectrum
IQ reference Time, spectrum
IQ error versus time Magnitude and phase (IQ measured versus reference); including instantaneous
Error vector Time, spectrum (vector difference between measured and reference); including instantaneous
Error summary EVM, magnitude error, phase error, rho, peak active CDE, peak CDE, frequency error, IQ offset,
IQ skew, slot amplitude droop
Symbols Table of symbol numbers and value
Channel Time domain trace data results for a single code channel within a speciied code layer
IQ measured Time
IQ reference Time
IQ error versus time Magnitude and phase (IQ measured versus reference)
Error vector Time (vector difference between measured and reference)
Symbol table and error summary EVM, magnitude error, phase error, code phase (degs), detected modulation, data bits
CDP/CDE data All code channels at once or speciied code layer
Code domain power All symbol rates taken together; individual symbol rates (80, 160, 320, 640, 1280 ksps); avail-
able for composite signal, speciied layer, instantaneous composite, or instantaneous layer
Code domain error All symbol rates taken together; individual symbol rates (80, 160, 320, 640, 1280 ksps); avail-
able for composite signal, speciied layer, instantaneous composite, or instantaneous layer
Overall Time domain trace data results derived from the channel X pre demodulated TD-SCDMA
burst data
Time Aligned analysis region; active timeslots highlighted
Filtered time IQ time, RRC iltered, resampled to 4x chip rate
Error summary Timing error, total power, midamble power, data power for each timeslot, data power left (be-
fore preamble), and data power right (after preamble)
Chan X trace data Time and frequency trace results from pre-demodulated chan X input data
Analysis timeslot Analyze single timeslot for time, spectrum, PDF, CDF, CCDF
Pre-demodulation Time, spectrum, correction, raw main time, instantaneous spectrum
Display formats
Overall time measurement results Active timeslots highlighted with background color
DP and CDE measurement results Active code channels highlighted by CDP layer color
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Key Speciications1
This technical overview provides nominal performance speciications for the software when making measurements with the speciied platform. Nominal values indicate expected performance, or describe product performance that is useful in the application of the product, but is not covered by the product warranty.
For a complete list of speciications refer to the measurement platform literature.
X-Series signal analyzers
PXA MXA (includes
Option BBA as noted)
EXA
Signal playback
Result length 1 to 8 sub-frames 1 to 8 sub-frames 1 to 8 sub-frames
Capture length > 25,000 sub-frames > 50 sub-frames > 50 sub-frames
Gap free analysis at 0% overlap;
1.6 MHz span
> 26,200 sub-frames with
Opt. BBA (BBIQ only)
Accuracy
Conditions 10 MHz to 3.6 GHz, input range > –30 dBm and within 5 dB of total signal power
Code domain
CDP accuracy Spread channel power within 20 dB of total power
±0.3 dB ±0.3 dB 2
±0.3 dB
Symbol power versus time Spread channel power within 20 dB of total power
±0.3 dB ±0.3 dB 2
±0.3 dB
Composite EVM
EVM loor ≤ 1.5% ≤ 1.5% 2 ≤ 1.5%
Frequency error
Lock range ±500 Hz ±500 Hz ±500 Hz
Accuracy ±10 Hz ±10 Hz ±10 Hz
1. Data subject to change.
2. Results apply to MXA with Option BBA.
12
PSA ESA
Signal playback
Result length 1 to 8 sub-frames 1 to 5 sub-frames 1
Capture length Gap free analysis at 0% overlap; 1.6 MHz span
10 sub-frames 5 sub-frames 1
Accuracy
Conditions 10 MHz to 3 GHz, input range
≥ –24 dBm and within 5 dB of total signal power
Input range within 5 dB of total signal power,
between 30 MHz and 3 GHz
Code domain
CDP accuracy Spread channel power within 20 dB of total power
±0.3 dB ±0.3 dB
Symbol power versus time Spread channel power within 20 dB of total power
±0.3 dB ±0.3 dB
Composite EVM
EVM loor ≤ 1.5% ≤ 1.5%
Frequency error
Lock range ±500 Hz ±500 Hz
Accuracy ±10 Hz ±10 Hz
Other analysis platforms
1. Requires frequency span ≤ 2.5 MHz, sub-frame start boundary. Drops to 2 sub-frames for two frame start boundary.
13
Model-Option Description Notes
PC/Instrument
license
Floating
license
89601B 89601BN 89600B VSA software Required
89601B-B7X 89601BN-B7X TD-SCDMA modulation
analysis
Required for
TD-SCDMA modula-
tion analysis
89601B-200 89601BN-200 Basic vector signal
analysis
Required
89601B-300 89601BN-300 Hardware connectivity Required
Ordering Information
Software licensing and conigurationChoose from two license types:
– PC/instrument license: Order
89601B if the software license
will reside on a PC/instrument.
The license can be trans ferred
to another PC/instrument at any
time.
– Floating license: Order 89601BN
if the software license will reside
on a server to be accessed by
multiple users, one at a time.
Hardware coniguration
The 89600B software supports over
30 instrument platforms including
spectrum analyzers, oscilloscopes,
logic analyzers and modular instru-
ment systems with its hardware
connectivity option (89601B/BN-
300).
www.keysight.com/ind/89600B_hardware
Keep your 89600B VSA up-to-date
With rapidly evolving standards and continuous advancements in signal
analysis, the 89601BU/BNU software update and subscription service
offers you the advantage of immediate access to the latest features and
enhancements available for the 89600B VSA software.
www.keysight.com/ind/89600B
You can upgrade!
All 89600B options can be added after your initial purchase and are
license-key enabled. For more information please refer to
www.keysight.com/ind/89600B_upgrades
Additional Resources
Literature
89600B Vector Signal Analysis Software, Brochure,
literature number 5990-6553EN
89600B Vector Signal Analysis Software, Configuration Guide,
literature number 5990-6386EN
89600B Opt 200 Basic VSA and Opt 300 Hardware Connectivity,
Technical Overview, literature number
5990-6405EN
Web
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measurements.
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14 | Keysight | 89601B/BN-B7X TD-SCDMA Modulation Analysis, 89600B Vector Signal Analysis Software - Technical Overview
This information is subject to change without notice.© Keysight Technologies, 2011-2014Published in USA, August 1, 20145990-6393ENwww.keysight.com