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The saddlepoint approximation g n ( t ) of f,(t) has a relative error O ( n - l ) uniformly for all t in a compact set, i.e.

Figure 35-4: The Copy Database Wizard creates an SQL Server Agent job; in this case, it named the job CDW_WINSERVER_MAIN_0.

Summary

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The master database is backed up in the same manner as user databases. Be sure to back up the master database when doing any of the following: Creating or deleting databases Modifying security by adding logins or changing roles Modifying any server or database-configuration options Because the MSDB database holds a record of all backups, back up the master database and then the MSDB.

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The other common control structure that you ll use in programming is the loop. A loop runs a block of code while a given statement continues to be true. The primary keyword for the loop is for. Here s the prototype for a for loop:

Figure 7.5.13 Frequencies of major elements observed in aluminosilicate-containing particles of Asian Dust, China Loess and local soil particle samples

Example 10.8: RAKE Reception in IS-95 The Qualcomm original receiver uses three moving ngers to implement the RAKE receiver. The original WaveLAN that was the model for implementation of the transmission system for the IEEE 802.11 standard did not use a RAKE receiver. Later, other manufacturers started implementation of RAKE receivers in wireless LANs to support more robust transmission. In summary, in the operation of a DSSS system, multipath does not cause ISI unless the information symbol transmission rate approaches the coherence bandwidth of the channel. Also, it is possible to design a receiver that takes advantage of isolated arriving paths to improve or even optimize system performance. The wider the transmission bandwidth, the greater the number of isolated paths that can be resolved, and the greater the order of implicit diversity that can be utilized. The isolated paths will provide a source of implicit diversity to a DSSS receiver, which improves the performance of the system. On the other hand, if not utilized in some diversity-combining receiver, the signal arriving from each path is a wideband interference to signals arriving from other paths, which degrades the performance of the DSSS system. 10.3.2 Performance of the RAKE Receiver Now we determine the received SNR for DSSS transmission on a frequency-selective multipath fading channel. The SNRs that we calculate apply to the peak of the correlation function and therefore represent the maximum achievable SNR at the output of a correlator. As shown by Eq. (10.3.7), the output of the receiver correlator includes a number of peaks, and the SNR is generally different for each peak. Each peak of the correlation function represents a branch of implicit or time diversity and is associated with signal arriving from one of the paths of the channel. Here we wish to determine the SNRs for all the diversity branches so that we can use them to analyze the performance of RAKE-type receivers. Because each diversity branch in effect represents a at-fading channel, we begin by treating the SNR at each branch as a random variable. We begin by determining the impact of multipath components as sources of interference to the signal received on any single path. Assume that we have L resolvable paths and that the amplitudes { i } of the paths, shown in Eq. (10.3.6), are independent random variables. We denote the mean-squared value E{ i2 } of the magnitude of the ith path in the impulse response as i2 . The received energy per bit for the ith branch is then given by i2 Eb , where Eb is the transmitted signal energy per bit. Assuming that paths are uncorrelated, the average received power for the ith path is given by Pav,i = i2 Eb Rb where Rb is the information bit rate. Assuming uncorrelated paths, the sum of interference power from the other L 1 paths and the additive noise power before dispreading at the receiver is