PRELIMINARY

WisyMAX Base Station Emulator (WisyMAX-BSE) is NI LabVIEW^® based system for real-time test and validation of PHY and MAC layers of Mobile WiMAX IEEE802.16e Subscriber Stations (SS).

WisyMAX-BSE fully emulates a Mobile WiMAX Base Station by implementing both PHY and MAC layers of the Mobile WiMAX standard (according to the IEEE 802.16-2004 Cor2/D3 document) in order to test Wave1 and Wave2 (partially) CRSL 2.0 compliant Subscriber Stations.

WisyMAX-BSE is a flexible tool set based on proprietary IPs to be used as a RF signal generator/analyzer and as a protocol tester for Mobile WiMAX compliant product validation in R&D and manufacturing. The WisyMAX-BSE package includes a complete set of NI LabVIEW^® VIs and source code examples of common WiMAX testing application to easily create dedicated tests for custom WiMAX devices.

WisyMAX-BSE is a complete customizable hardware and software system, based on the NI PXIe-5641R IF-RIO, the NI PXI-5650 RF signal generator and the NI PXIe-8130RT embedded real-time controller, that works within the NI LabVIEW^® environment.

RF setup depends on the WiMAX bands. For instance, for the 2.3-2.7 GHz bands (1A, 1B and 3A profiles) it is composed by the NI PXI-5610 2.7 GHz RF upconverter and the NI PXI-5600 2.7 GHz RF downconverter.

PHY/MAC WiMAX Tester functionalities
WisyMAX-BSE provides the SS performance assessment and testing for both DownLink (DL) and UpLink (UL)

• DL/UL testing of any Mobile WiMAX signals
• Calibrated UL/DL RF generation and analysis
• UL transmitter measurements (e.g., power, CFO, ScFO, I/Q offset, EVM, CCDF, modulation parameters, spectrum flatness)
• Control functions of session parameters (e.g., ID, DL-MAP, UL-MAP, DCD, UCD)
• BER/PER measurements
• MAC processing, packet analysis and logging IP Interface (IPv4 CS layer).

WisyMAX-BSE supports the following PHY & MAC features:

• Cyclic Prefix Size: 1/4, 1/8, 1/16, 1/32
• Frame Length: 2 ms, 2.5 ms, 4 ms, 5 ms, 8 ms, 10 ms, 12.5 ms, 20 ms
• FFT Size: 128, 512, 1024, 2048
• Nominal Bandwidth: 5 MHz, 7 MHz , 8.75 MHz, 10 MHz
• TTG and RTG guard time for TDD and H-FDD mode
• Up to 8 zones for DL Frame
• Up to 64 burst in a DL Frame
• Up to 16 concurrent bursts in a DL Frame
• Uplink Frame Decoding for only one SS device. In the UL frame, only one data burst or only one ranging region is supposed to be present (sequential SS tests)
• DL PUSC and DL FUSC Permutation
• UL PUSC Permutation
• Initial Ranging and Handover Ranging in UL PUSC zone with 2 or 4 symbols
• Periodic Ranging and Bandwidth Ranging in UL PUSC zone with 1 or 3 symbols
• Timing Offset, Power Offset and Carrier Frequency Offset (CFO) estimation from the Ranging Zone
• Convolutional Coding (CC) with Tail Biting
• Randomization and Interleaving
• QPSK, 16-QAM and 64-QAM Data Modulation
• Repetition Coding: 2, 4 and 6 (also FCH repetition coding)
• Subcarrier PRBS Randomization
• BPSK Pilot Modulation
• All Preamble Index Support
• IPv4 Convergence Sub-layer
• MAC PDU Formats
• MAC Feedback Mechanism
• Network Entry
• ARQ support
• QoS support
• Data Delivery Methods: UGS, RTVR, NRTVR, ERTVR, BE
• Request Grant Mechanism
• Normal MAP
• Closed Loop Power Control
• Reset command and Deregistration message
• Channel Measurements message/command support
• DL CINR report Base Station Support
• Contention Resolution.

RF Hardware
The main HW specifications of the NI kit composed by NI PXI-5610 RF Upconv., NI PXI-5600 Downconv., NI PXI-5650 RF Generator and NI PXIe-5641R IF -RIO ⁽¹⁾:
RF Power range: -140 dBm to +10 dBm
RF Frequency range: from 250 kHz to 2.7 GHz
Clock stability: better than 0.1 ppm
RF Power Accuracy: about ± 1 dB
Frequency resolution: 1 Hz
Spurious responses: maximum -40 dBc (second harmonic).

Note (1): see NI Datasheets for more detailed information.