دانلود کتاب ارتباطات سیار پیشرفته، جلد 3، ارتباطات نوری کوانتومی

The German “Zukunftsinstitut” has identified twelve “mega trends” of our times, one of which is “connectivity.” Since the early 1990s, mobile communications have been a major component of this mega trend. Although it might sound harsh, it might be clever to leave a gap between the natural frequency ≈ 300GHz and the natural frequency ≈ 30THz and then to continue with a revolutionary new physical layer based on optics. In particular, wireless quantum optics seem to be a viable way forward. The belief in wireless quantum optics as an excellent asset for the further evolution of advanced mobile communications (AMC) sparked the author’s conviction of a truly bright future of communications by setting out from quantum optics. Following the imperative “Don’t Stop Believin’ ” (Journey, 1981), we all may suppose that happy photons will be heading down the quantum optics highway towards future advanced mobile communications. →Figure 1 illustrates the author’s thinking. Artificial intelligence (AI) will be a component of the air interface, also called radio interface, which is the focus of this textbook. In their seminal textbook, Sutton and Barto point out that reinforcement learning (RL), which is seen as part of AI [→3, p. xiii], contains optimal control, and hence dynamic programming already developed in the 1950s by Richard Bellman and others [→3, p. 14f.]. Dr. Wolfgang Sauer-Greff, a dear friend of the author, pointed out in his doctoral dissertation [→4, p. 8f.] that data detection schemes like the Viterbi algorithm (VA) [→5] and its relatives [→6], [→7] are backward search strategies determining the best predecessor and as such belong to dynamic programming. This is also true for an optimum symbol by symbol detectors like the BCJR algorithm [→8]. The author is delighted to say that he has performed research in this field since 1990; cf., e. g., [→9], [→10], [→11], [→12], [→13]. It is hence no surprise that the said detection schemes will be addressed in this textbook; cf. Chapter →2.