java gs1-128

java gs1-128

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1. List three reasons why TV spectrum bands are desirable for the implementation of cognitive radio. 2. State the reason for following two mechanisms of the cognitive radio: (a) Why does the cognitive radio need to sense spectrum bands before accessing them (b) Why does the cognitive radio need to periodically sense spectrum bands 3. Consider a primary system in which primary users work on a spectrum band with SNR p , and the spectrum bandwidth is W . The probability that primary users use the whole spectrum band is p, and the probability that the primary users use none of them is 1 p. The cognitive radio users access this spectrum band only if it is not used by primary users. When only cognitive radio users use this band, the SNR is s . The background noise is with constant power density. (a) Assuming the cognitive radio users can perfectly sense the occupancy state of this spectrum band, give the sum Shannon capacity of primary and cognitive systems. (b) Assume the cognitive radio users have probability ( < 1) to detect the existence of primary users, and have probability b (b < 1) to detect the absence of primary users. Give the Shannon capacity of primary and cognitive systems.

MS Initialization When a mobile station powers up, it tunes to the CDMA carrier frequency and attempts to acquire the Pilot Channel Acquisition of the Pilot Channel is relatively simple, even though the MS is not synchronized with the BS yet, because the pilot uses a known Walsh code (W0, consisting of all zeros) and transmits an all-zero baseband pattern The Pilot is also spread by the short PN code pairs, which are applied with a phase offset speci c to the particular BS The MS despreads the received signal by sliding its internally generated short PN codes until the all-zero signal is detected If pilots are detected at multiple offsets (eg, when pilots from multiple BSs are detectable in a border area), the MS chooses the one with the strongest signal.

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When I use drawing templates, one of my favorite techniques to get to a multi-view drawing quickly is to put one Pre-defined View on the template along with appropriate views projected from the Pre-defined View. A Pre-defined View establishes an orientation and location on the drawing sheet. You can add multiple Pre-defined Views and align them with one another on the drawing sheet so that a drawing is automatically populated by the model, but this is not recommended because if you decide to change the orientation of the drawing, you have to change each Pre-defined View independently. If you set up a single Pre-defined View and make the rest of the views with Projected Views, changing the orientation of the Pre-defined View causes all the Projected Views to update associatively. You cannot directly change the orientation of a Projected View. Pre-defined Views and views projected from Pre-defined Views appear blank until they are populated with model geometry. The pre-defined part of a Pre-defined View is the orientation and placement of the view. Figure 20.21 shows a template using Pre-defined and Projected Views. You can access Pre-defined Views on the Drawings toolbar; although it is not there by default, you can place it on the toolbar by choosing Tools Customize Commands and using the interface. You can also access Predefined Views by choosing Insert Drawing Views Pre-defined. Projected Views are also accessed from the Drawings toolbar. Once a Pre-defined View has been placed, you can select an orientation for it from the PropertyManager. Figure 20.22 shows the Drawing View PropertyManager. The orientation for a view is set in the top Orientation panel. In addition to orthogonal views, you can also create isometric and other custom views as Pre-defined Views.

The Now Playing tab is the selected tab by default. The Visualization screen takes up most of the Windows Media Player interface. Depending on your settings, it may display the Album Art associated with the music you are playing, or a psychedelic pattern that doesn t serve any real purpose other than to look good. The album title and its track listing (the title of each song and its length in minutes) appear on the right side of the screen, underneath a thumbnail of the album cover. When you roll your mouse over it, the size reduces to display the Album Name, Artist, and Genre, along with a button to buy the track from an online store if you have an active Internet connection. It has to be said, however, that the advantage of being offered the chance to buy a track you clearly already possess was not immediately apparent to us.

At this point the MS knows that its internally generated short PN sequence is in-phase with the sequence received from the BS Because the number of chips of the short code is a 512 multiple of a Walsh cycle, the BS can now synchronize its internally generated Walsh codes with the codes received from the BS and decode reverse code channels The MS then despreads the Sync Channel by applying code W32, and receives the Sync Channel message sent periodically by the BS The message contains system information (long code state and system time) that enables the MS to synchronize its long code generator with the BS With short, long, and Walsh codes now synchronized, the MS enters the idle state and monitors paging channel 1 From the System Parameters message, broadcast periodically on the paging channel, the MS learns the number of paging channels supported by the BS.

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