Melbourne, FL–August 12, 1996–Harris Corp.'s (Melbourne, FL) baseband processor, which simplifies development if IEEE 802.11 direct sequence spread spectrum (DSSS) wireless local area network (WLAN) transceivers for the licensee-free 2.4 GHz industrial, scientific, and medical (ISM) band, with data rates up to 4 million bits per second, is now available.
The HSP3824 Direct-Sequence Spread-Spectrum Baseband Processor provides direct-sequence spread spectrum modulation and demodulation of serial data streams. In a WLAN, it interfaces between a media access controller (MAC) chip and an intermediate frequency (IF) modulator/demodulator. On the MAC side, the baseband input and output digital data streams are in plain packet-data format. On the IF side, the input and output analog data streams are split into in-phase (I) and quadrature (Q) components that represent a randomized version of the MAC data that has been spread by an 11- to 16-bit chipping sequence. On the transmit side, subsequent modulation of the I and Q data streams from the HSP3824 and up-conversion produces a DSSS RF signal. On the receive side, the HSP3824 handles all the digital signal processing necessary to recover a baseband signal and send it to the MAC. All functions are integrated in a 48-lead ultra-thin quad flat-pack package.
DSP functions hardwired in the HSP3824 include time-invariant pseudo-random noise (PN) matched-filter correlators, DBPSK and DQPSK demodulators, a data encoder, a data scrambler/descrambler, and state machines implementing clear channel assessment (CCA) and packet-header detection and generation algorithms. It also incorporates IEEE 802.11 physical-layer (PHY) protocol generation and detect circuitry.
The HSP3824 is available now for $21.36.
Harris Corp.
Seemiconductor Sector
P.O. Box 883
Melbourne, FL 32902
(800) 4-HARRIS ext. 7497
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