July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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128
A separation of 0.7 times the bit rate would improve the ISI but increase
the bandwidth.
8.4.5 Phase shift keying
There are several variants of phase shift keying. Binary phase shift
keying (BPSK or PSK) changes the phase of the carrier by 180
◦
at the
zero crossing point (Figure 8.10(b)). No carrier frequency is present
with PSK as half the time the carrier is multiplied by +1 and the other
half by −1 and cancels out, but the reference phase of the carrier must
be re-inserted at the receiver. The bandwidths occupied are the same
as for ASK, i.e.:
Baseband = 2B
RF bandwidth (AM or NBFM) = 2(f
c
+ B)
Differential phase shift keying (DPSK) advances the phase ...
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