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By Savo G Glisic

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Called a time-hopping sequence. This provides an additional time shift of c(k) j Tc seconds to the jth monocycle in the pulse train, where Tc is the duration of addressable time delay bins. For a fixed T f , the symbol rate, Rs , determines the number, Ns , of monocycles that are modulated by a given binary symbol as Rs = (1/Ns T f )s −1 . 21 FCC frequency mask. 22 FCC mask and possible UWB signal spectra. chosen to optimize performance. For performance prediction purposes, most of the time the ∞ data sequence {d (k) j } j=−∞ is modeled as a wide-sense stationary random process composed of equally likely symbols.

4 Multicarrier CDMA (MC CDMA) Good performance and the flexibility to accommodate multimedia traffic are incorporated in MC CDMA, which is obtained by combining the CDMA and OFDM signal formats. 12 shows the DS-CDMA transmitter of the jth user for the binary phase shift keying/coherent detection (CBPSK) scheme and the power spectrum of the transmitted signal, respectively, where G DS = Tm /Tc denotes the processing gain and C j (t) = j j j [C1 C2 · · · C G DS ] the spreading code of the jth user.

20 Simulated bit error probability versus the decoding delay for the decoding of the rate 1/2 (2, 1, 7) convolutional code. The signal to noise ratio E/N0 is 3 dB. 21 Performance bounds with hard and soft decision maximum likelihood decoding for the (3, 1, 3) convolutional code. The curve with ‘+’ refers to simulation results obtained with the soft decision Viterbi algorithm. 7 dB can be achieved by reconfiguration of the code from N = 3 to N = 9. 27 2−6 . 22 Upper bounds to the soft ML decoding bit error probability of different convolutional codes of rate 1/2.

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