chip rate


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chip rate

In direct sequence spread spectrum technologies such as DSSS and CDMA, it is the number of bits per second (chips per second) used in the spreading signal. A different spreading signal is added to the data signal to code each transmission uniquely. The number of chips (bits) in the spreading signal is significantly greater than the data bits. Chip rate is measured in "megachips per second" (Mcps), which is millions of chips per second. See spread spectrum, CDMA and 802.11.
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The PN sequence generator produces a PN code of 256 chips length, and chip rate R= 256 kcps (kilo chips per second).
Therefore, the chip rate needed and the occupied bandwidth required will be independent of the number of aircraft in the network.
To simplify the problem and highlight the differences in BER due to the filters, a quadrature phase shift keying (QPSK) modulator with a chip rate of 3.84 Mc/s followed by a single filter for each channel was used to obtain the simulation results.
The overall data bit-to-symbol mapping effectively implements a direct sequence spread spectrum (DSSS) scheme with a chip rate of 2 Mchips/s from a data rate of 250 kbps.
Using hardware or software to create tapped delay lines at the chip rate allows this chip's transition energy to be integrated.
The long code generator is required to generate spreading sequences at a chip rate of 1.2288 Mcps for spreading rate 1 and 3.6864 Mcps for spreading rate 3.