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The schematic diagram of FHSS communication has shown as follows.
o] are the hypotheses that FHSS signal is detected in the received signal or not and that the four scenarios are equally likely P([D.
It isn't a perfect solution, but co-mingling a DSSS system with a FHSS system generally produces less interference than two DSSS systems in the same physical space (even in the same frequency range).
Using field-proven proprietary FHSS technology, 1x1s provide interference rejection, enable co-located system operation, increase output power, and maintain data integrity.
A single, narrowband source of interference that merely decreases the data throughput for FHSS can cripple a DSSS system.
We will design the FHSS physical layer IC with the highest possible integration and the lowest cost," said Ron Van Dell, vice president and general manager of Harris Semiconductor's Communications Products Business.
FHSS Client/ Server addressing allows many ST-90/QUAD site controllers to transmit in the same area.
This made jamming or interrupting FHSS transmissions difficult, while, at the same time, designing FHSS transmitters was relatively inexpensive.
TABLE I KEY SPECIFICATION AND FEATURES Operating frequency (MHz) 860 to 928 Data rate (kbps) 128 max Rx sensitivity (dBm) -95 to -100 Transmitter power (dBm) +6 max Integrated RF switch yes On-chip data storage 64 byte FIFO Programmable address/correlator 32 bits FHSS capable yes DC current (Tx mode) (mA) 30 DC current (Rx mode) (mA) 37 TABLE II RECEIVER CHARACTERISTICS Receiver Sensitive (dBm) -95 to-100 Dynamic range (dB) 105 to 110 LNA Gain (dB) 25 NF (dB) < 3 Mixer Gain (dB) -12 NF (dB) 12 Baseband Filter High pass (kHz) 50 Cutoff frequency (kHz) 275 adjustable Attenuation (dB) 60 at 1 MHz (high data rate)
Generally, applications requiring 200 ms response time or slower are a good candidate for FHSS.
This software provides for FHSS modulation in a 250 kHz bandwidth using 25 frequency hops.
This near tripling of the radiated FHSS power level, combined with the location of the base-station almost directly adjacent to the DSSS workstation NIC card, plus the overlap in the RF spectrum, manifested itself in seemingly random device or network failures.
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