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NIST HARDWARE SPECIFICATION
EQUIPMENT:
A cellular wireless device test system consisting of a reverberation chamber, base-station emulator, channel emulator, and rotating platform.
Background:
NIST is supporting the development of test methods, best practice guidelines, and uncertainties for the cellular wireless community. New over-the-air test methods for cellular wireless devices that utilize reverberation chambers are under development. NIST requires hardware that will allow development and verification of proposed methods.
Objectives:
The objective is to procure instrumentation that will enable NIST to replicate proposed test methods and develop new or refined test methods for the cellular wireless industry. Both single-input, single-output (SISO) and 2 x 2 multiple-input, multiple-output (MIMO) devices shall be tested. Handheld devices shall be tested in the new chamber, while large-form-factor devices shall be tested in existing NIST chambers. Consequently, NIST requires four line items: (1) A reverberation chamber test chamber set-up for handheld devices; (2) a base-station emulator; (3) a channel emulator; and (4) a rotating turntable for testing large-form-factor devices. The first three line items shall be capable of measuring both SISO and 2 x 2 MIMO test conditions. Five years of annual calibration of the base station emulator and channel emulator is required. A warranty period of a minimum of 3 years for these units is required.
Delivery:
Delivery of all components shall be less than 12 weeks.
Line Item 1: Reverberation Chamber Test System
| Parameter |
| Conditions |
| Min |
| Typ |
| Max |
| Units |
| Frequency range of operation |
| Frequency range may exceed typical |
| -- |
| 0.7-6 |
| -- |
| GHz |
| Shielding performance of chamber from ambient |
| To be measured and certified by manufacturer for at least the minimum and maximum frequencies of operation |
| 100 |
| 120 |
| -- |
| dB |
| Accuracy |
| Accuracy in reference power transfer function when averaged over complete stirring sequence, 2 x 2 MIMO mode |
| -- |
| 0.3 |
| 0.5 |
| dB |
| Mechanical mode-stirring paddle |
| Mechanical paddle may rotate or move laterally |
| 1 |
| 2 |
| -- |
| each |
| Rotating platform |
| Supports loads up to 20 kg |
| 1 |
| 1 |
each
| Stirring sequence control |
| User must be able to specify and automatically control all stirring mechanisms in both stepped and continuous stirring modes, with at least the specified number of stirring states (excluding frequency stirring) |
| 1000 |
| 10,000 |
| -- |
| samples |
| Interior side dimension |
| Interior dimension on each side must be at least 3 at 700 MHz (=~0.428m) |
| 1.28 |
| -- |
| 2.5 |
| m |
| Working volume dimensions |
| Defined as volume where device under test may be placed such that it may maintain a distance from any metallic or RF absorbing surface of at least /2 at the lowest frequency of operation (~0.214m). May be cylindrical. Minimum dimension for any single side or height of working volume is 0.5 m. |
| 0.5 |
| 1 |
| 6 |
| m3 |
| Antennas |
| Two omnidirectional reference (transmit) antennas, two directional measurement (receive) antennas required. Must operate over “frequency range of operation” stated above. |
| 4 |
| 6 |
| -- |
| each |
| Minimum root-mean-square delay spread (RMSDS) |
| Sufficient RF absorber shall be provided to produce an RMSDS of 50 ns (operation shall typically utilize longer RMSDS) without diminishing working volume. |
| 50 |
| 50 |
| -- |
| ns |
| Bulkhead RF feedthrough connectors |
| SMA (female-female) or Type N (female-female) is acceptable. Must operate over “frequency range of operation” above and be compatible with 2x2 MIMO operation. |
| 6 |
| 8 |
| -- |
| each |
| Bulkhead control feedthrough connectors |
| USB (female-female) |
| 1 |
| 2 |
| -- |
| each |
| Bulkhead feedthrough panels |
| Blank panel or pipe with caps to allow outside-to-inside access. Shielded when not in use. |
| 2 |
| 4 |
| -- |
| each |
| Door to chamber |
| Hinged door with user-operated latch |
| 1 |
| 1 |
| -- |
| door with user-operated latch |
| Operating Ambient Air Temp |
| Unit and electronics shall operate over a standard commercial operating range |
| -- |
| Commercial |
| -- |
| -- |
Line Item 2: Channel Emulator
| Parameter |
| Conditions |
| Min |
| Typ |
| Max |
| Units |
| Frequency range of operation |
| Frequency range may exceed typical |
| -- |
| 0.7-6 |
| -- |
| GHz |
| RF channel bandwidth |
| Instantaneous bandwidth |
| 40 |
| 40 |
| -- |
| MHz |
| RF input power range |
| Ratio of minimum to maximum input power with SNR > 35 dB |
| 50 |
| 55 |
| -- |
| dB |
| RF output level resolution |
| Over entire input power range |
| -- |
| 0.1 |
| 0.1 |
| dB |
| Error vector magnitude |
| Root-mean-square EVM_RMS for WCDMA (3.84 MHz BW) |
| -- |
| -50 |
| -45 |
| dBm |
| Number of channels |
| Capable of supporting 4G LTE with 2x2 MIMO |
| 2 |
| 2 |
| -- |
| channels |
Taps per channel
| Channel models |
| At a minimum: (1) 3GPP/CTIA spatial channel models for MIMO simulations, (2) user-defined channel models |
| 2 |
| -- |
| -- |
| channel model modes |
| Doppler |
| Emulation of Doppler shift |
| 2 |
| 5 |
| -- |
| kHz |
| Remote control and data acquisition |
| Unit must be user controllable with all measurement parameters available through remote acquisition |
| -- |
| -- |
| -- |
| -- |
Line Item 3: Base-Station Emulator
| Parameter |
| Conditions |
| Min |
| Typ |
| Max |
| Units |
| Frequency range of operation |
| Frequency range may exceed typical |
| -- |
| 0.7-2.7 |
| -- |
| GHz |
Frequency resolution
Minimum RF output power
Maximum RF output power
RF output level resolution
Maximum RF input power
Minimum RF input power
| Number of RF channels |
| Capable of supporting 4G LTE with 2x2 MIMO |
| 2 |
| 2 |
| -- |
| channels |
| Supported measurement formats |
| All conform to 3GPP standards: LTE FDD (data throughput), WCDMA (BER, BLER), GSM (BER) |
| 3 |
| -- |
| -- |
| formats |
| Remote control and data acquisition |
| Unit must be user controllable with all measurement parameters available through remote acquisition |
| -- |
| -- |
| -- |
| -- |
Line Item 4: Rotating Turntable for Large-Form-Factor Devices
| Parameter |
| Conditions |
| Min |
| Typ |
| Max |
| Units |
Rotating turntable platform size
Rotating turntable platform load
| Stepped movement |
| Angular increment of stepped movement |
| -- |
| 0.1 |
| 0.5 |
| deg |
Minimum speed for continuous movement
Maximum speed for continuous movement
| Control |
| Remote control required, commands must be made available to user for control with software for other stirring mechanisms such as mechanical paddles and instrumentation such as base-station emulators |
| -- |
| -- |
| -- |
| -- |
Calibration, Warranty, Technical Support, Shipping Five years of annual calibration of the channel emulator and base-station emulator is required, preferably through the manufacturer of each instrument.
An extended warranty period for the channel emulator and base-station emulator is desired, but a minimum of 3 years is required.
Basic Technical Support for 1 year
Shipping of all parts