DSSS Modulator 20 Mchip/s

KEY FEATURES

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

ComBlock COMPATIBILITY LIST

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