By Simon Dunstan
Booklet via Dunstan, Simon
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Example text
The bit error rate of a received digital signal is the number of bit errors divided by the total number of bits received. As we will discuss in Chapter 4, the signal-to-noise ratio, which impacts the bit error rate, is a function of the signal strength of the received signal. 22 is for parity or error-correction code bits. Parity bits are added to allow the detection of the presence of bit errors. If all of the parity bits are appropriate, the received word contains no errors. If this section contains an error detection and correction (EDC) code, it is possible to correct any bit errors in the received signal up to some performance limit.
For reasons explained later, frequency hopping signals carry their information in digital form, so there is a data rate (the bit rate of the information signal) and a hop rate. ” By definition, a slow hopper is a signal in which the data rate is faster than the hop rate, and a fast hopper has a hop rate faster than the bit rate of the information transmitted. 35. However, many people speak of a signal with a hop rate of about 100 hops per second as a slow hopper and a signal with a significantly higher hop rate as a fast hopper.
40 Chirp signal. 41 Chirp signal transmitter. LPI scheme, the data transmitted can be expected to be digital so that data blocks can be synchronized to the sweeps and then reorganized into a continuous data stream in the receiver. This is particularly true if the sweep start times are delayed by a pseudo-randomly selected factor. Low Probability of Intercept The LPI qualities of the chirped signal have to do with the way receivers are designed. A receiver typically has a bandwidth approximately equal to the frequency occupancy of the signal it is designed to receive.
