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Within communications systems there are certain inherent general design problems that the engineer should be aware of: 1 The Class A or Class AB power amplifier of a microwave transmitter in multipoint service (where many clients are served by a single central hub transceiver site) should be designed to transmit minimal additive wideband noise This wideband noise effectively lowers the SNR at the central hub receiver when in this multipoint environment, since there may be hundreds of client transmitters that are on at the same time whether modulated or not 2 Adjacent channel interference (ACI) problems can be alleviated by employing different polarizations or different frequencies in adjacent sectors in a multisectorized hub antenna environment, by using sectorized hub antennas with proper side and back lobe rejection, by avoiding excessive hub transmitter power level outputs 3 Amplitude ripple and tilt across a wideband digital channel must be minimized to a level not to exceed 05 dB for QAM and QPSK so as to decrease BER degradation 4 Such esoteric impairments as in-channel tones, transient bursts, or TDMA timing issues can create crippling cochannel interference or decreased BER In-channel tones and transient bursts can be lessened by redirecting the client antenna (if possible), by using a more directional antenna, or by .net upc-a reader . NET Barcode Reader Library | C# & VB. NET UPC-A Recognition ...
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Net is a port of ZXing, an open-source, multi-format 1D/2D barcode image processing library ... With the Barcode Reader SDK, you can decode barcodes from. tracking down and eliminating the interferers (if possible) Timing is a control issue, and will normally not be your concern 5 Frequency stability is quite critical for the upstream channel, especially when wideband cable modems are employed as the modulator/demodulators In these cases, stability must be better than 12 kHz to catch a standard cable modem s preamble (or the link will not lock up), as well as to maintain the BER over time with no automatic reboots A longer preamble that can tolerate a frequency spec of 25 kHz is possible with some cable modems 6 Group delay ripple (GDR) must be no more than 75 ns for QAM-64, and less than 200 ns for QPSK, as increased GDR increases ISI Simple analog design considerations (mainly for the system s bandpass filters) and digital adaptive equalizing will keep GDR in spec 7 Increased system linearity, through hardware design and/or the appropriate SSPA back-off at the hub and client transmitter, will lessen BER degradation of a digital signal by decreasing intermodulation distortion levels 8 Multipath causes phase cancellation, which creates both amplitude and phase distortions of the desired signal This decreases the received signal s strength, thus decreasing SNR and increasing BER It also creates undesirable amplitude notches or slopes, causing increased ISI Increasing the gain, and thus the directionality, of the antennas; proper location of the hub transceiver (such as not placing it in front of a tall building or mountain); and using equalizers will all mitigate, but cannot eliminate, multipath problems 9 Near/far receiver issues can mean some compromises in transmitter and receiver design Depending on how close a client is to the hub, a close-in receiver may become saturated by the constant power output of the hub transmitter in a multiclient environment This can be significantly reduced by using receiver front-end attenuators, utilizing the natural shadowing effect created by a high-mounted hub antenna (allowing the close-in receiver to be under the main lobe of the transmitter s antenna), employing different gain antennas for the close-in client receiver to that of the farther out client receiver, or using a switchable front end that will permit the LNA to be bypassed if the client receiver is too close to the hub transceiver 10 Phase noise created by the nonperfect nature of a real LO will degrade the BER and increase the ISI A digital wideband client receiver, for example, should possess a phase noise spec 85 dBc/Hz at 10 kHz, or better, to lessen BER degradation of the incoming signal. . be located on as high an area and/or tower as practical This will allow the cov- Just to the right of the Shortcuts bar you ll see what s called the Palette Well See all the overlapping tabs that look like file folders Each indicates a palette with a specific purpose Roll your cursor over each tab to see what we mean A palette is a floating box that can display a range of things from image-editing features to a list of menu commands; and the Palette Well is where they all reside when not in use Though we can t discuss them all now you ll learn about specific palettes later on we will explain some general characteristics common to all palettes and give you a couple of tips to use them efficiently barcode in asp net core, .net core qr code generator, ocr sdk c# free, uwp generate barcode
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