Available Features (W-CDMA(3GPP)/HSPA)

W-CDMA Code Division Multiple Access: One of several digital wireless transmission methods in which signals are encoded using a specific pseudo-random sequence, or code, to define a communication channel. A receiver, knowing the code, can use it to decode the received signal in the presence of other signals in the channel. This is one of several "spread spectrum" techniques, which allows multiple users to share the same radio frequency spectrum by assigning each active user an unique code. CDMA offers improved spectral efficiency over analog transmission in that it allows for greater frequency reuse. Other characteristics of CDMA systems reduce dropped calls, increase battery life and offer more secure transmission. See also IS-95. (3GPP)/HSPA (89601B7NC) provides the following W-CDMA and HSPA signal modulation analysis capabilities:

W-CDMA features

HSPA features

HSPA+ MIMO features

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W-CDMA features

These features are applicable to W-CDMA modulation analysis:

• Standard presets for

  • W-CDMA (3GPP) Uplink (Mobile Station or User Equipment)

  • W-CDMA (3GPP) Downlink (Mobile Station)

• 3.84 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. variable (user definable) chip rate

• Single code domain layer or composite code-domain power and code-domain error displays (the composite display shows all code layers simultaneously). Normalize code-domain power to display the code-domain power relative to the total signal power in the code domain.

• Code domain Offsets table which shows time and phase offset of each active Walsh code channel

• Single channel time-domain displays, such as IQ measured, IQ reference, IQ magnitude/phase error, and error vector traces.

• Composite time-domain displays, such as IQ measured time, IQ magnitude or phase error, and error vector time traces.

• Adjustable filter Alpha (default 0.22)

• Ability to bypass the Root-Raised-Cosine measurement filter.

• Mirrored (flipped) frequency spectrums can be used to remove the effects of high-side mixing.

• Measurement offset and interval (similar to time gating) used to select specific data slots for analysis

• HSPA signal analysis capability (see HSPA features)

• Flexible active channel identification for CDP and composite results

  • Automatic identification of active Code Channel, using auto or manually computed thresholds.

  • Predefined 3GPP Test Model 1 thru 4

  • Variable Active Channel Threshold

• Time gating is not available (does offer measurement offset/interval feature)

• Averaging is available only for code domain trace data and is only applied to the numeric error summary data in the symbol table, as follows:

  • rms (video) - computes an average of each rms error update in the table.

  • rms exponential - is like rms (video) except that averaging continues past the average count with an exponential weighting.

  • continuous peak hold - keeps track of the peak rms error of each update in the table.

  • Time and time exponential averaging are not available.

• Average types available for the pre-demodulated spectrum, code domain power, and code domain error trace data results.

  • rms (video)

  • rms exponential

  • continuous peak hold)

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Digital Demod vs. W-CDMA features

Features that are applicable to Digital Demod but not available with W-CDMA demodulation:

• Measurement/Reference filter

• Pulse and Sync search

• Equalization Filter

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HSPA features

These are the additional W-CDMA features that are applicable to HSPA modulation (when Enable HSPA is selected):

• HSDPA High Speed Downlink Packet Access and HSUPA High Speed Uplink Packet Access uplink and downlink channel modulation analysis

• Automatic modulation scheme detection for HS-PDSCH High Speed Physical Downlink Shared Channel channels using QPSK Quadrature phase shift keying, 16QAM, or 64QAM. Manual or automatic control of modulation scheme for despread HS-PDSCH Physical Downlink Shared Channel channels.

• Automatic modulation scheme detection for E-DPDCH Dedicated Physical Data Channel channels using BPSK Binary phase shift keying - A type of phase modulation using 2 distinct carrier phases to signal ones and zeros., or 4PAM.

• Predefined Test Model 5 and Test Model 6 setup options (as defined in Section 6.1.1 of 3GPP TS Technical Specification.25.141 V5.7.0 (2003-06) Rel 5 technical specification).

HSPA+ MIMO Signal Analysis features

[Option B7U WCDMA/HSPA+ modulation analysis supports 2x2 DL Down Link (forward link: from base station to cell phone) MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. for HS-PDSCH systems using flat-fading features:

• MIMO channel compensation
• User-selectable pre-coding matrix
• User-selectable impairment model (transmitter/receiver)
• Despread traces with ability to select individual test plane
• MIMO info summary table

See Also

89600-Series VSA Standard Features

About W-CDMA(3GPP) Demodulation

Setting up a W-CDMA (3GPP) measurement

About Optional Measurement Software