About W-CDMA(3GPP)/HSPA Modulation Analysis

89601B7NC: 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 adds W-CDMA "Wideband Code Domain Multiple Access" and HSPA" High Speed Packet Access" modulation capability to your 89600 VSA software. The VSA can analyze W-CDMA (3GPP) and HSPA signals that are compliant with the following 3GPP Technical Specifications:

• TS Technical Specification 25.211 V8.4.0 (2009-03) Rel 8 (for physical channels and mapping of transport channels onto physical channels - FDD Frequency Division Duplex: A duplex scheme in which uplink and downlink transmissions use different frequencies but are typically simultaneous.)

• TS 25.212 V8.5.0 (2009-03) Rel 8 (for multiplexing and channel coding - FDD)

• TS 25.213 V8.4.0 (2009-03) Rel 8 (for spreading and modulation - FDD)

• TS 25.214 V8.5.0 (2009-03) Rel 8 (for physical layer procedures, including HS-DSCH High Speed Downlink Shared Channel MIMO Multiple Input, Multiple Output: A physical layer (PHY) configuration in which both transmitter and receiver use multiple antennas. operation - FDD)

• TS 25.141 V8.6.0 (2009-03) Rel 8 (for base station (BS Base Station - The equipment on the network side of a wireless communications link. The base station contains the tower, antennas and radio equipment needed to allow wireless communications devices to connect with the network.) conformance testing - FDD)

• TS.34.121-1 V8.4.0 (2009-03) Rel 8 (for user equipment (UE User Equipment (e.g. cell phone)) conformance specification – FDD)

Measure, evaluate, and troubleshoot your W-CDMA and HSPA signals with the feature set provided in W-CDMA (3GPP)/HSPA modulation analysis. Use these features to descramble, despread, and demodulate W-CDMA uplink and downlink signals. The VSA automatically identifies all active channels regardless of the symbol rate or spread code-length. Speed measurement set-up with standard pre-sets for uplink (mobile station or user equipment) and downlink (base station). Use the single layer and composite code domain power and code-domain error traces (the composite display shows all code layers simultaneously) to determine the overall performance of your signal and the behavior of specific layers and channels. Take advantage of the composite and single channel constellation, IQ magnitude/ phase error traces, and error vector traces to search out specific errors. Use the measurement offset and interval controls to select specific data slots for analysis.

HSPA

With 89601B7NC, the VSA can measure and analyze HSPA "High Speed Packet Access" defined signals, which refer to both the HSDPA High Speed Downlink Packet Access "High-Speed Downlink Packet Access" and HSUPA High Speed Uplink Packet Access "High-Speed Uplink Packet Access" channels. HSPA is an extension to the Universal Mobile Telecommunications System (UMTS) standard published by 3GPP. The HSPA extensions described in release 5 of the UMTS standard provide a roadmap for UMTS-based networks to increase their data transfer speeds and capacity. Current HSPA deployments support 1.8 Mbit/s, 3.6 Mbit/s, 7.2 Mbit/s and 14.4 Mbit/s in downlink.The HSUPA extensions increasing the uplink data rate to 5.76 Mbit/s are described in Release 6 of the UMTS standard.

HSDPA Downlink analysis provides the following capabilities; 1) descramble, despread, and demodulate these HSPA downlink channels: HS-PDSCH High Speed Physical Downlink Shared Channel, and HS-SCCH Shared Control Channel for HS-DSCH channels, 2) automatic or manual modulation scheme detection for QPSK Quadrature phase shift keying, 16QAM, and 64QAM and 3) Test Model configuration preset support for Test Model 5 and Test Model 6 standard based tests.

HSPA Uplink analysis provides the following capabilities; 1) descramble, despread, and demodulate the HSPA uplink HS-DPCCH Dedicated Physical Control Channel (uplink) for HS-DSCH channel and the HSUPA uplink E-DPDCH Dedicated Physical Data Channel and E-DPCCH E-DCH Dedicated Physical Control Channel channels, automatic modulation scheme detection of 4-PAM pulse amplitude modulation: A technique for encoding the samples of an analog waveform as part of the PCM process. Also used to display the amplitude of QAM signals in an eye diagram. for the I branch or Q branch or I/Q composite channel, manual modulation scheme detection of BPSK Binary phase shift keying - A type of phase modulation using 2 distinct carrier phases to signal ones and zeros. and 4PAM I or Q and 4PAM I/Q combined channels, despread of the HS-DPCCH Dedicated Physical Control Channel channel, and tHS-DPCCH "timing offset of HS-DPCCH".

HSPA+ MIMO

89601B7NC supports 2x2 DL Down Link (forward link: from base station to cell phone)-MIMO measurements for HS-PDSCH Physical Downlink Shared Channel systems using flat-fading, see HSPA+ MIMO Overview topic for more information.

See Also

W-CDMA (3GPP) Available features

Setting up a W-CDMA (3GPP) measurement

Setting up a HSPA measurement

About Optional Measurement Software