Simulated Assessment of Interference Effects in Direct Sequence Spread Spectrum (DSSS) QPSK Receiver
Abstract
This research developed and validated a generic simulation for a direct sequence spread spectrum (DSSS), using di erential phase shift keying (DPSK) and phase shift keying (PSK) modulations, providing the exibility for assessing intentional interference e ect using DSSS quadrature phase shift keying receiver (QPSK) with matched ltering as a reference. The evaluation compares a comprehensive pool of jamming waveforms at pass-band that include continuous wave (CW) interference, broad-band jamming, partial-band interference and pulsed interference. The methodology for jamming assessment included comparing the bit error rate (BER) versus required jamming to signal ratio (JSR) for di erent interferers using the Monte Carlo approach. This thesis also analyzes the e ect of varying the jammer bandwidth for broad-band jammers including broad-band noise (BBN), frequency hopping interference (FHI), comb- spectrum interference (CSI), multi-tone jamming (MTJ), random frequency modulated interference (RFMI) and linear frequency modulated interference (LFMI). Also, the e ect of changing the duty cycle for pulsed CW waveforms is compared with the worst case pulsed jamming equation. After the evaluation of di erent interferers, the research concludes that pulsed binary phase shift keying (BPSK) jamming is the most e ective technique, whereas the CW tone jamming and CW BPSK interference result are least e ective. It is also concluded that by nding an optimum bandwidth, FHI and BBN improves the required JSR by approximately 2.1 dB, RFMI and LFMI interference by 0.9 and 1.5 dB respectively. Alternately, MTJ and CSI improves their e ectiveness in 4.1 dB and 3.6 dB respectively, matching the performance of the pulsed BPSK jammer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 27, 2014
- Accession Number
- ADA600187
Entities
People
- Luis S. Rojas
Organizations
- Air Force Institute of Technology