89601B/BN-B7X TD-SCDMA Modulation Analysis … · 3 Troubleshoot and analyze TD-SCDMA modulation...
Transcript of 89601B/BN-B7X TD-SCDMA Modulation Analysis … · 3 Troubleshoot and analyze TD-SCDMA modulation...
89601B/BN-B7X TD-SCDMA Modulation Analysis
89600B Vector Signal Analysis Software
Technical Overview
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 specifi ed 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
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Table of Contents
Key Features .....................................................................................................1TD-SCDMA Modulation Analysis ................................................................3 Analysis and Troubleshooting ......................................................................4Software Features ...........................................................................................8Key Specifi cations ...........................................................................................11Ordering Information ......................................................................................13Additional Resources .....................................................................................14
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Troubleshoot and analyze TD-SCDMA
modulation and RF performance with
Option B7X for Agilent’s 89600B vec-
tor 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-amble
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
signal standards and modulation
types for which the 89600B vector
signal analysis (VSA) software cre-
ates a window into what’s happening
inside your complex wireless devices.
The 89600B tools provide views of
virtually every facet of a problem,
helping you see the “why?” behind
signal problems. Whether you’re
working with emerging or established
standards, Agilent’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.agilent.com/find/89600B_trial
TD-SCDMA Modulation Analysis
TD-SCDMA technology overview
Time division-synchronous code
division multiple access
(TD-SCDMA) combines FDMA and
CDMA technologies. Unlike W-CDMA
and cdma2000® technologies, this
TDD standard transmits and receives
on the same frequency, which greatly
increases spectrum effi ciency.
Because TD-SCDMA effectively
handles symmetrical and asymmetrical
traffi c, it is ideal for data-intensive
applications, such as mobile internet
access and multimedia applications.
TD-SCDMA was proposed by the
China Wireless 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 Communication
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
Access (UTRA) as the UTRA-TDD
option.
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Analysis and Troubleshooting
Gain insight into your signal with 20:20 visibility
The 89600B VSA software profi les
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 fi eld 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 indi-
cate 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.
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Review your signal’s performance with CDE and CDP data
Code domain error (CDE) and code
domain power (CDP) results are
available for the layer or the com-
posite signal in either averaged or
instantaneous 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 dis-
tribution of signal power across the
set of code channels normalized to
the total signal power. Together they
provide key insight into the perfor-
mance 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 identifi cation. Markers on the composite trace help with the identifi cation 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.
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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
modulation 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 evaluating and troubleshooting wireless signals in R&D. PC-based and supporting numerous measurement platforms, the 89600B provides the fl exibility and sophisticated measurement tools essential to fi nding and fi xing signal problems.
X-Series advanced measurement applications provide embedded format-specifi c, one-button measurements for X-Series analyzers. With fast measurement speed, pass/fail testing and simplicity of operation, these applications are ideally suited for design verifi cation and manufacturing.
www.agilent.com/find/X-Series_Apps
Choosing between 89600B VSA software and X-Series measurement applications
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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 fi rst 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 specifi cations 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 Midamble 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 Specifi es 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 Specifi es 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 Specifi es 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 performs analysis based on the detected modulation format
(HSPA/8PSK only)
Manual Specifi es 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 demodu-
lation and signal analysis
Time reference Specifi es the time reference used to compute the Overall Error Summary - Timing
Error data results
Start boundary Specifi es when to start the Result Length data capture
Uplink switch point Specifi es which Traffi c TimeSlots are uplink and which are downlink
Analysis timeslot Specifi es which sub-frames timeslot, within the selected Analysis Sub-frame, is
used for analysis and trace data measurement results
Analysis sub-frame Specifi es 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 Composite 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 (fl ipped) 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 timeslot 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 er-
ror, 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 specifi ed 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 specifi ed code layer
Code domain power All symbol rates taken together; individual symbol rates (80, 160, 320, 640, 1280
ksps); available for composite signal, specifi ed layer, instantaneous composite, or
instantaneous layer
Code domain error All symbol rates taken together; individual symbol rates (80, 160, 320, 640, 1280
ksps); available for composite signal, specifi ed 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 fi ltered, resampled to 4x chip rate
Error summary Timing error, total power, midamble power, data power for each timeslot, data
power left (before 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 Specifi cations1
This technical overview provides nominal performance specifi cations for the software when making measurements with
the specifi ed 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 specifi cations 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 fl oor ≤ 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.
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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 fl oor ≤ 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.
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Model-Option Description Notes
PC/Instrument license
Floating license
89601B 89601BN 89600B VSA software Required
89601B-B7X 89601BN-B7X TD-SCDMA modula-
tion analysis
Required for
TD-SCDMA modu-
lation analysis
89601B-200 89601BN-200 Basic vector signal
analysis
Required
89601B-300 89601BN-300 Hardware connectivity Required
Ordering Information
Software licensing and confi guration
Choose 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 confi guration
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.agilent.com/fi nd/89600B_hardware
Keep your 89600B VSA up-to-date
With rapidly evolving standards and continu-ous advancements in signal analysis, the 89601BU/BNU software update and sub-scription service offers you the advantage of immediate access to the latest features and enhancements available for the 89600B VSA software.
www.agilent.com/find/89600B_upgrades
You can upgrade!
All 89600B options can be added after your initial purchase and are license-key enabled. For more information please refer to
UPGRADE
www.agilent.com/find/89600B
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© Agilent Technologies, Inc. 2011Printed in USA, January 31, 20115990-6393EN
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Additional Resources
Literature89600B Vector Signal Analysis Soft-
ware, Brochure, literature number
5990-6553EN
89600B Vector Signal Analysis Soft-
ware, Confi guration Guide, literature
number 5990-6386EN
89600B Opt 200 Basic VSA and Opt
300 Hardware Connectivity, Technical
Overview, literature number
5990-6405EN
Webwww.agilent.com/fi nd/cellular
www.agilent.com/fi nd89600B
cdma2000 is a US registered certifi ca-
tion mark of the Telecommunications
Industry Association.