... ProbabilityComplex-Valued Quaternary Sequences6.2 Systems with Random Spreading SequencesDirect-Sequence Systems with PSKQuadriphase Direct-Sequence Systems 6.3Wideband Direct-Sequence Systems Multicarrier Direct-Sequence ... interference. Both systems provide the same when and nearly the same when Figure 2.18 illustrates versus thenormalized frequency offset for quaternary and binary systems, G = 17dB, and GS / I = ... 0 for QPSK and for OQPSK and MSK); CMF= chip-matched filter; SSG = spreading sequence generator.90CHAPTER 2. DIRECT-SEQUENCE SYSTEMS where is the duration of both a data symbol and a channel...