By Daniel M. Dobkin
Eventually, here's a unmarried quantity containing all the engineering details had to effectively layout and enforce any form of instant community! writer Dan Dobkin covers each element of RF engineering important for instant networks. He starts off with a overview of crucial math and electromagnetic concept through thorough discussions of multiplexing, modulation kinds, bandwidth, hyperlink budgets, community strategies, radio approach architectures, RF amplifiers, mixers and frequency conversion, filters, single-chip radio platforms, antenna thought and designs, sign propagation, in addition to making plans and enforcing instant networks for either indoor and outside environments.The appendices comprise such important facts as united states, eu, and jap technical and regulatory criteria for instant networks, measurements in instant networks, mirrored image and matching of transmission traces, picking out strength density, and lots more and plenty extra. The accompanying CD contains necessary software program instruments reminiscent of a hyperlink price range calculator, a Smith Chart calculator and plotter, and radio chain research utilities. it doesn't matter what kind of instant community you design-Bluetooth, UWB, or maybe metropolitan quarter community (MAN)-this publication is the only reference you cannot do with out! ?· The A-to-Z consultant to instant community engineering-covers every little thing from easy electromagnetic idea to modulation ideas to community making plans and implementation!?· Engineering and layout rules lined are acceptable to any form of instant community, together with 802.11, 802.16, 802.20, and Bluetooth.?· Discusses cutting-edge modulation concepts comparable to extremely wideband (UWB) and orthogonal frequency-division multiplexing (OFDM).
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Additional info for RF Engineering for Wireless Networks: Hardware, Antennas, and Propagation (Communications Engineering)
In Figure 2-24, we depict the two delayed and attenuated replicas of the signal added to the directly transmitted version. The sum is garbled after the first bit, and there is no easy way to extract the transmitted symbols: intersymbol interference has wiped out the data even though there is ample signal power available. We should note that in Figure 2-24, for simplicity we show the three signals as adding after demodulation, that is, after the carrier frequency has been removed. In fact, the signals add at the carrier frequency, which may give rise to the related but distinct problem of fading, a subject we deal with in more detail in Chapter 6.
Antennas much accept signal voltages from the transmitter without reflecting the input power back into the connection: they need to be matched to the transmitter impedance. This matching typically can only be achieved over a finite bandwidth, which must at least extend over the band the antenna is to be used for. Antennas need to be physically robust enough to survive in service: PC-card antennas will get whacked and banged, and outdoor installations must survive heat, cold, wind, rain, and snow.
If we assume that the channel bandwidth is approximately equal to the inverse of the symbol rate, this upper bound corresponds to about 3 bits/symbol. ) We can thus infer that in this case, little or no advantage would result from using a modulation such as 64QAM (6 bits/symbol): the noise-created symbol errors could presumably be corrected by coding, but the overhead associated with correcting the mistakes would exceed the benefit gained. Note that if a higher S/N could be obtained, by turning up the transmit power, reducing the transmit-to-receive distance, or other means, the capacity of the channel would be increased, allowing for exploitation of more complex symbols, though the increase is logarithmic: an eightfold increase in the signal is required to achieve a doubling of the data rate.