By Savo G Glisic
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Additional info for Advanced wireless communications : 4G technologies
18 Encoder (a) and trellis (b) for a (2, 1, 3) convolutional code. The trellis (c) refers to the rate 2/3 punctured code. 19 Encoder (a) and trellis (b) for the (3, 2, 3) convolutional code equivalent to the rate 2/3 punctured code described. so that the ratio between the case of the unpunctured to the punctured solution yields: Dr = D 2k0 = Dpunc 2k0 which shows that, for k0 > 2, there is an increasing complexity reduction. 19) g12 is negative. 16, whose distance from the received sequence is minimal.
D N −1 ] are mapped in OFDM symbols [d0 , d1 , . . 7 An early version of OFDM. 8 Spectrum overlap in OFDM. The output of the FFT block at the receiver produces data per channel. 9(b). 10. 11. The signal parameters are: 64 points FFT, 48 data subcarriers, 4 pilots, 12 virtual subcarriers, DC component 0, Guard interval 800 ns. A discussion of OFDM and an extensive number of references on the topic are included in Chapter 7. 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.
19 Spectrum of a TH signal. 20 Spectra of (a) pseudorandom DS and (b) random DS signals. 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.