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When you troubleshoot your computer, be sure to only change one thing at a time. Doing so allows you to individually rule out hardware or software changes. If you still aren t able to solve your problem, you have two choices: computer repair or wipe your system. If you re an old pro with Windows, you are probably comfortable with wiping your system and reinstalling Windows. It s a hassle, but you know how to get it done. If you re not very comfortable with your computer, you may want to consider sending it in to the shop for repairs. However, this option can be both costly and time consuming. Every time we ve considered sending a machine in, we ve been told it would take 3 4 weeks to diagnose and repair it.

Figure 24-3: You can graphically generate an XML Schema document by using the Visual Studio .NET XML Schema designer.

Quick Tips appear in the pop-up window in the lower-right corner of the graphics window. They can change as you work so that they are sensitive to the context in which you are working. They are a great way for new users or infrequent users to learn or be reminded of the next steps available to them. You can activate and deactivate Quick Tips using the question mark icon in the lowerright corner of the SolidWorks window on the status bar. Figure 2.28 shows the Quick Tips window in action.

Orthogonal Frequency Division Multiplexing (OFDM)

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The previous chapter introduced the basic select statement and query flow. This chapter expanded the concept with expressions and calculations that can be inserted in several places within the query, significantly improving its flexibility. In later chapters, you see how expressions can receive data from subqueries and user-defined functions, further increasing the power of the query. The next chapter continues the progression of adding capability to the query by joining data from multiple data sources.

Summary

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You can add input parameters that pass data to the stored procedure by listing the parameters after the procedure name in the create procedure command. Each parameter must begin with an @ sign, and becomes a local variable within the procedure. Like local variables, the parameters must be defined with valid data types. When the stored procedure is called, the parameter must be included (unless the parameter has a default value). The following code sample creates a stored procedure that returns a single product category. The @CategoryName parameter can accept Unicode character input up to 35 characters in length. The value passed by means of the parameter is available within the stored procedure as the variable @CategoryName in the where clause:

As for any other coherent wireless system, operation of OFDM systems requires an estimate of the channel transfer function, or, equivalently, the channel impulse response. Since OFDM is operated with a number of parallel narrowband subcarriers, it is intuitive to estimate the channel in the frequency domain. More precisely, we wish to obtain the N complex-valued channel gains on the subcarriers. Let us denote these channel attenuations as hn,i , where n is the subchannel index and i is the time index. Assuming that we know the statistical properties of these channel attenuations, and some structure to the OFDM signal, we can derive good channel estimators. In the following, we treat three approaches: (i) pilot symbols, which are mainly suitable for an initial estimate of the channel; (ii) scattered pilot tones, which help to track changes in channels

When SQL Server is initially installed, it already contains several system and user objects. Four system databases are used by SQL Server for self-management, two sample user databases are available for experimentation, and every database includes several system objects, including tables, views, stored procedures, and functions. Within Enterprise Manager, the system objects might be hidden. In the Registered SQL Server Properties page, you can choose what to display using the Show system database and system objects option.

The next example sets all non-mapped users to connect using their own security context (the recommended option). The local user is null, so this linked server login applies to all nonmapped users. The @useself option is not specified, so the default setting, true, will apply, causing the users to use the local security context:

Boot Camp is a feature of Mac OS X and is configured via that system s Boot Camp Assistant. As shown in Figure 2-49, Boot Camp Assistant is available from the Mac OS X Utilities folder (Applications Utilities) and provides a wizard-based configuration experience.

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