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FIGURE 14.14 Maximum theoretical transmission rates in megabits per second versus room size in meters. Optical power, 1 W; receiver area, 1 cm2 ; = 950 nm. (From [Gfe79b] IEEE.)

TABLE 23-1

As in 7, it is easy to show that there is always some pair (ao, with bo) bo 2 0 minimizing Q(u.b). We first take care of the limiting case bo = 0. For this, it is advisable to scale $ differently, namely to divide the right-hand side of (12.5) by b ( Q ) . In the limit b = 0, this gives (12.19) $(z; 0) = sign(g(z; Q) - a ( 0 ) ) . The differential conditions for (ao, 0) to be a minimum of Q now have a 5 sign, instead of =, in (12.16), since we are on the boundary, and they can be written as

A mathematically exact de nition starts out with the frequency correlation function RH (0, f ), assuming WSSUS (see Figure 6.8a for an example). The coherence bandwidth can then be de ned as: Bcoh = 1 |RH (0, f )| |RH (0, f )| arg max = 0.5 arg min = 0.5 2 RH (0, 0) RH (0, 0) f >0 f<0 (6.46)

(6.72)

TCP/IP is actually a suite of protocols. The IP portion of TCP/IP provides the transport protocol. TCP provides the mechanism through which IP packets are received and recombined, ensuring that IP traf c arrives in a usable state. TCP/IP arose from the ARPANET, which was the precursor to today s Internet. TCP/IP is standards-based and supported by nearly every operating system, including all Microsoft operating systems, Unix, Linux, Macintosh, NetWare, OS/2, Open VMS, and others. This wide compatibility and the capability to interconnect dissimilar systems are the primary reasons why TCP/IP has become so popular. Although TCP/IP is most often used to provide wide-area networking (such as on the Internet), it is an excellent choice as a local network transport protocol, particularly where organizations

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(12.82)

The Invite People window appears. If someone is signed into People Near Me and they are on the same subnet, their names will automatically appear in the Name box you see in Figure 7-43. If that is the case, then simply check the check box associated with their name and click the Send Invitations button. Otherwise, you can send them an e-mail or create an invitation to be sent out, as shown in the next steps.