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In order to prevent overlap of the signals and to simplify filtering, each of the modulated signals is separated by a guard band, which consists of an unused portion of the available frequency spectrum.
where B is the available frequency bands.
In CR-MANETs, the available frequency bands change over time.
The available frequency range of the generator (19 21 kHz) is systematically scanned.
The concept of cognitive radio is based on opportunistic access to the available frequency resources.
The available frequency band is divided into 40 2-MHz wide channels.
Similar(14)
Techniques allow sending many bits at the same time, by placing them as different tones along the available frequencies, like notes on a musical scale.
The standard way around this is to use a mosaic pattern, so that only some of the available frequencies are used in a given cell, and none of those frequencies is used in any neighbouring cell.
The smallest obstruction on the roadway (like persistent interference between channels, known as crosstalk, along just a small set of the available frequencies) requires the paired set of communications devices to talk at ever slower rates, until a speed is achieved where the signal and noise can be told apart.
The available frequencies for the different FFR schemes described in Section 3.1 are summarized in Table 3. B denotes the total frequency band of the system.
Consequently, there is a smaller choice of the available frequencies, frequencies are more saturated, the SINR per SU is decreasing, and an average throughput per user decreases.
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