Table of Contents
octoFade-3GPP is FPGA based wireless channel emulator that operates in real-time on a stream of input IQ samples, producing a stream of output IQ samples.
octoFade RTL block diagram
octoFade-3GPP emulates multipath and Doppler fading and AWGN per 3GPP certification specifications, supporting GSM, UMTS and LTE channel models.
octoFade-3GPP is available as
The RTL is easily customizable and expandable, based on the available logic resources. RTL is provided in VHDL and can be implemented in ASIC or FPGA. The octoFade-3GPP can be easily integrated with off-the-shelf RF test equipment for testing through the device antenna terminals.
octoScope can customize the octoFade-3GPP RTL to fit a desired hardware platform and customer requirements. 802.11n/ac channel models, currently available as C software, will be available as RTL soon.
|Digital IQ inputs (N)||Up to 8 (16-bit)|
|Digital IQ outputs (M)||Up to 4 (16-bit)|
|MIMO channels||Up to 2 independently configured MIMO channels|
|Maximum number of TDL paths||Up to 16 paths|
|Maximum number of taps per TDL (T)||Up to 18|
|Maximum number of taps||144 taps total (N x M x T)|
|Tap specifications||0 to -40dB; 0.1dB resolution
10ns delay resolution
30us max delay range
|3GPP channel models||LTE: EPA 5Hz; EVA 5Hz;EVA 70Hz; ETU 70Hz; ETU 300Hz; MBSFN
GSM: RAx; HTx; TUx; EQx; TIx
UMTS: PA3; PB3; VA30; VA120; MBSFN
Moving propagation, birth-death, high-speed train
|Custom channel models||Arbitrary fading profiles can be implemented in software and loaded into the FPGA via register interface.|
|Distortion||Better than -50dBc|
|AWGN||SNR: -10 to +25dB; 0.1dB resolution
Bandwidth: Up to 20MHz, per 3GPP standard requirements
Spectrum: Classical Doppler
Shift: 0.1 – 1000Hz; 1Hz resolution
|Control Interface||32-bit register memory map|
|FPGA resources (dual channel 4x2 MIMO topology example with 18 taps per MIMO path)||Logic: ~84k ALUTs
Memory: 6-7 Mb
octoScope can modify any of these specifications and integrate octoFade-RTL into a desired FPGA platform, for example Altera Stratix IV GX FPGA Development Kit, 530 Edition (DK-DEV-4SGX230N) or National Instruments LabVIEW FPGA module. The octoFade solution can be easily integrated with off-the-shelf RF test equipment, such as VSA/VSG, for testing through the device antenna ports or over-the-air. Please contact email@example.com with any inquiries