By Savo G Glisic
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Additional info for Advanced wireless communications : 4G technologies
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.
14. 9 one can verify, and then generalize for any encoder with arbitrary n 0 and k0 = 1, that, for each input digit u i , n 0 digits will be generated in accordance with: (xi1 , xi2 , xi3 , . . 14) k=1 This relation has the form of convolution, hence the name convolutional coding. 15, is used. 13 Encoder for the (2, 1, 4) convolutional code. 14 Encoder for the (3, 2, 2) convolutional code. 15 State diagram for the (3, 1, 3) convolutional code. 9, has memory ν = N − 1 = 2. We deﬁne the state σl of the encoder at discrete time l as the content of its memory at the same time, ˆ (u l−1 , u l−2 ).
2 Adaptive Coding Channel coding is a well established technical ﬁeld that includes both strong theory and a variety of practical applications. Both theory and practice are well documented in open literature. In this chapter we provide a brief review of the basic principles and results in this ﬁeld, with the emphasis on those parameters which are important for adaptability and reconﬁgurability of coding and decoding algorithms. This is an important characteristic for applications in wireless systems where a strong request for energy preservation suggests a system operation where quality of service (QoS) is met with minimum effort.
Advanced wireless communications : 4G technologies by Savo G Glisic