By Rodger E. Ziemer
This lecture covers the basics of unfold spectrum modulation, which might be outlined as any modulation strategy that calls for a transmission bandwidth a lot more than the modulating sign bandwidth, independently of the bandwidth of the modulating sign. After reviewing easy electronic modulation recommendations, the significant varieties of unfold spectrum modulation are defined. some of the most very important elements of a range spectrum procedure is the spreading code, and several other forms and their features are defined. the main crucial operation required on the receiver in a range spectrum procedure is the code synchronization, that is frequently damaged down into the operations of acquisition and monitoring. skill for appearing those operations are mentioned subsequent. ultimately, the functionality of unfold spectrum platforms is of basic curiosity and the impression of jamming is taken into account, either with out and with using ahead blunders correction coding. The presentation ends with attention of unfold spectrum structures within the presence of alternative clients.
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This lecture covers the basics of unfold spectrum modulation, that are outlined as any modulation process that calls for a transmission bandwidth a lot more than the modulating sign bandwidth, independently of the bandwidth of the modulating sign. After reviewing easy electronic modulation strategies, the crucial types of unfold spectrum modulation are defined.
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Extra info for Fundamentals of Spread Spectrum Modulation
2 DPSK Data Modulation We again assume that the jammer concentrates its power in a fraction ρ of the FH/DPSK bandwidth. When not jammed, the noise power spectral density is NT = N0 . When jammed, the noise power spectral density is NT = N0 + NJ /ρ. 5 exp (−Eb /NT ) for binary DPSK, the average probability of error for the FH/DPSK system is Pb = 1 1 1 . 10) and setting the result equal to zero, we find that ρopt = 1 . 11) book Mobk087 56 August 3, 2007 13:15 FUNDAMENTALS OF SPREAD SPECTRUM MODULATION M=2 -1 10 M=4 -2 10 M=8 Pb M = 16 -3 10 -4 10 5 10 15 20 25 P/J W/R, dB 30 35 40 FIGURE 26: Performance of FH/MFSK noncoherent in worst-case partial band jamming.
2) book Mobk087 52 August 3, 2007 13:15 FUNDAMENTALS OF SPREAD SPECTRUM MODULATION 0 10 BPSK DS E b /N0 = 4 dB -2 10 E b /N0 = 6 dB -4 E b /N0 = 8 dB -6 E b /N0 = 10 dB 10 Pb 10 -8 10 E b /N0 = 12 dB -10 10 0 5 10 15 20 25 30 P/J W/R, dB 35 40 45 50 FIGURE 23: Performance of BPSK/BPSK spread spectrum in barrage, partial band, or tone jamming. where φ J − θs is the phase difference between the jamming and signal. 2), the binomially distributed interference random variable was replaced by a Gaussian random variable with the same mean and variance.
R When a FH band is jammed and q = J /P , the symbol error probability is the . 15) 0, J /P < 1, where · = the largest integer not exceeding the argument. 5, M 1 Pb = , 2 log M (P/J ) (W/R) 2 0, P J W R M ≤ log2 M P W < R J M log2 M P W W ≤ J R R W . 16) Bit error probability performance for FH/MFSK in multi-tone jamming is shown in Fig. 29. The reason for the steep decrease to Pb = 0 above a certain (P/J ) (W/R) is because of the assumption of no Gaussian noise and the finite amplitudes of the jamming tones.
Fundamentals of Spread Spectrum Modulation by Rodger E. Ziemer