DSSS Modulator 20 Mchip/s
  • A higher-performance newer generation DSSS modulator is now available: COM-1519
  • Direct sequence spread-spectrum (DS-SS) Modulator
  • Programmable chip rates up to 20 Mchip/s
  • Spreading codes:
    • Gold sequences (up to 223-1 chips)
    • Maximal length sequences, (max length 223-1 chips)
    • Barker codes (length 11, 13)
    • GPS C/A codes
  • Code modulation: BPSK/QPSK/OQPSK with output spectral shaping filter: raised cosine square root filter with 20%, 25%, 35% or 40% rolloff. Filter can be bypassed.
  • Internal generation of pseudo-random bit stream and unmodulated carrier for test purposes
  • Built-in channel impairments generation:
    • additive white Gaussian noise
    • frequency offset (Doppler)
    ComScope-enabled: key internal signals can be captured in real-time and displayed on a host computer
  • Connectorized 3”x 3” module for ease of prototyping. Standard 40 pin 2mm dual row connectors (left, right). Single 5V Supply with reverse voltage and overvoltage protection. Interfaces 3.3V LVTTL logic

    Input Output
    COM-1509 Convolutional encoder, K=5,7,9 COM-2001 Digital to Analog conversion, baseband
    COM-7002 Turbo code encoder COM-4004 70 MHz IF modulator
    COM-8001 Pattern generator 256MB/1GB COM-1518 Direct sequence spread-spectrum demodulator (digital back-to-back)
    COM-8004 Signal Diversity Splitter COM-1824 Channel emulator (Doppler, delay, fading, noise)
    COM-5003 TCP-IP / USB Gateway


    Other Modulators
    DSSS 60 MChips/s
    (353 KB)