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Benefits

  • Provides a complete communication chain from baseband to RF to channel to receiver in one environment.
  • Enables early architecture exploration for RF and mixed-signal systems, reducing costly redesigns later in the flow.
  • Allows designers to evaluate BER, SNR, throughput, coverage and link robustness under a wide range of scenarios.
  • Facilitates co-design with antenna, DSP, power amplifier and cabling models to capture system-level interactions.
  • Reusable parameterized blocks support rapid experimentation and design reuse across projects.

The Communication System library in VisualSim Architect provides a complete set of building blocks to model end-to-end communication chains, from baseband and modulation through RF front-end, channels and receivers. Designers can assemble realistic communication systems including modulation, RF mixers, ADC/DAC, JESD, filters, transmitters, receivers, RF generators and channel models, and integrate them with antenna, DSP, power amplifier and cabling models.

The library supports architectural exploration of wireless, wireline and mixed-signal systems, enabling early analysis of throughput, BER, latency, spectral efficiency and power before committing to hardware or FPGA/ASIC implementation.

Overview

This library contains parameterizable components that represent all major portions of a communication pipeline:

  • Modulation / Demodulation Blocks – Support for a range of digital modulation schemes (e.g., BPSK, QPSK, QAM variants, OFDM-style frames) for baseband modeling.
  • RF Mixers and Frequency Translation – Up/down conversion between IF, baseband and RF, with configurable LO frequency, gain and non-idealities.
  • ADC / DAC Models – A/D and D/A converters with sampling rate, resolution, quantization noise and interface behavior.
  • JESD Interface Models – JESD-style high-speed serial data interfaces between data converters and digital processing blocks.
  • Filter Library – Variety of filters: low-pass, high-pass, band-pass, channel filters, anti-aliasing, matched filters and user-defined responses.
  • Transmitters and Receivers – End-to-end TX/RX behavioral models including framing, coding hooks, front-end and back-end processing.
  • RF Signal Generators – RF and baseband signal sources for test and verification, including tone, wideband and burst generators.
  • Channel Models – AWGN, fading, multipath and parameterizable link-impairment models for wireless and wired channels.

These components can be assembled to represent simple links, multi-carrier systems, MIMO/beamforming chains and complex RF front-ends, while sharing a common simulation environment with digital, networking and power models.

Supported Features

  • Baseband and RF modeling:
    • Support for complex I/Q signal representation.
    • Configurable carrier frequency, bandwidth and sample rate.
  • Modulation and waveform generation:
    • Digital modulation (BPSK, QPSK, QAM families, OFDM-style structures).
    • Pulse shaping and symbol mapping.
  • RF mixer and LO behavior:
    • Frequency conversion with gain, loss and basic non-idealities.
    • Configurable LO frequency and mixer topology.
  • ADC/DAC characteristics:
    • Resolution, sampling rate and quantization behavior.
    • Ideal and non-ideal converter modes.
  • JESD-style digital links:
    • Parameterizable line rate and lane configuration.
    • Latency and flow-control behavior for converter data paths.
  • Filter models:
    • Standard analog/digital filter types and user-defined frequency responses.
    • Configurable cut-off frequencies, order and gain.
  • Channel modeling:
    • AWGN, flat and frequency-selective fading, multipath models.
    • Path loss, Doppler effects and configurable SNR.
  • Hooks for coding, interleaving, equalization and DSP post-processing.
  • Parameterizable impairments (noise, distortion, timing offset, frequency offset).

Key Parameters

  • Modulation_Type – e.g., BPSK, QPSK, QAM variant, OFDM-style.
  • Carrier_Frequency – RF or IF frequency of operation.
  • Bandwidth / Sample_Rate – Effective signal bandwidth and sampling frequency.
  • Filter_Type / Cutoff_Frequency / Order – Filter configuration parameters.
  • ADC_Bits / DAC_Bits – Converter resolution.
  • ADC_Sampling_Rate / DAC_Sampling_Rate – Conversion rates.
  • JESD_Line_Rate / Lane_Count – High-speed interface settings.
  • Channel_Type – AWGN, fading, multipath, wired cable model, etc.
  • SNR / EbNo – Signal-to-noise ratio or energy per bit to noise density.
  • Path_Loss / Fading_Parameters – Environment and propagation characteristics.
  • PA_Gain / Backoff / Efficiency – Power amplifier operating region (when integrated).

Analysis and Reports

Example analysis outputs include:

  • Bit Error Rate (BER) and Packet Error Rate (PER) versus SNR or Eb/No.
  • Constellation diagrams and eye-diagram style metrics (where applicable).
  • End-to-end throughput and latency across TX–channel–RX chain.
  • Spectral occupancy and effective bandwidth usage (when integrated with spectrum analysis).
  • Impact of filter choice, LO settings and converter resolution on link performance.
  • Power and energy per bit when combined with power models.

Applications

  • Wireless and RF Systems
    • Modeling transceiver chains for cellular, WiFi, satellite, radar and point-to-point links.
    • Evaluating link performance (BER, SNR, throughput) under realistic channels.
    • Exploring modulation and waveform choices for new standards.
  • Mixed-Signal Front-End Design
    • Architecting ADC/DAC placement, JESD links and RF front-end blocks.
    • Studying trade-offs among resolution, sample rate, bandwidth and power.
  • Base Station, Remote Radio Unit and Small Cell Design
    • End-to-end modeling from digital baseband through RF and antenna.
    • Link-budget validation for different deployment scenarios.
  • Defense, Aerospace and Radar
    • RF chains for radar, EW and secure communication links.
    • Channel and interference modeling for contested environments.
  • Education and Algorithm Prototyping
    • Teaching modulation, RF and channel concepts with executable system models.
    • Algorithm validation before implementing in FPGA, DSP or ASIC.

Integrations

The Communication System library integrates with:

  • Antenna models for gain, pattern and beamforming behavior.
  • DSP blocks for filtering, equalization, coding/decoding and waveform processing.
  • Power amplifier models for linearity, efficiency and back-off behavior.
  • Cable and interconnect models for loss, dispersion and delay.
  • Traffic Modeling library for realistic data and control-plane workloads.
  • Stochastic Resource and Processor libraries for scheduling and resource usage analysis.
  • Power and thermal models to relate link operation to energy consumption and thermal constraints.

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