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Experience has shown that for some of the commonly used formulas for calculating space diversity, the improvement factor may underestimate the improvement for small antenna spacing and overestimate improvement for large antenna spacing on flat land microwave links In space diversity systems, maximum-power combiners have been used most widely so far Other combiners, employing a more sophisticated approach using both minimum-distortion and maximum-power may give even better performance Calculation of the outage prediction and diversity improvement factor are described in ITU-R P530-xx Space diversity can be combined with angle diversity to further enhance performance if desired, in which case both of the antennas are tilted to provide the additional angle-diversity enhancement This can be achieved by tilting the main (upper) antenna of a space-diversity pair and the transmitting antenna upward by a small angle This uptilting of the antennas might result in a loss of flat fade margin in the approximate range 25 to 6 dB, the amount depending on whether the tilt is optimized to minimize fading or amplitude distortion In addition, tilt the diversity (lower) antenna of a space-diversity pair downwards from the local horizontal by a small angle
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3722 Frequency Diversity In a frequency diversity system, the radio at each terminal contains redundant transmitter-receiver pairs and simultaneously transmits the same signal over two or more radio frequency channels located at the same frequency band Each transmitter operates on a different RF channel, and both transmitters are energized and, similarly, each receiver operates on a RF channel that is different but identical to the corresponding transmitter at the far end When equipment failure or path fading affects an RF channel to the point at which the signal is degraded, a decision is made at the receiver end of the link to switch to a stand-by channel Using empirical data and mathematical models, Vigants and Pursley developed in 1979 an improvement factor calculation for point-to-point microwave links with frequency diversity:
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f = frequency spacing (GHz); if f > 05 GHz, use f = 05 f = frequency (GHz) d = path length (mi) CFM = composite fade margin (dB)
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This formula is also used by ITU-R P530-xx, and it applies to FD links (two channels) with the following ranges of parameters: 2 f 11 GHz 30 d 70 km f 5% f Like space diversity, frequency diversity is highly effective against dispersive fading For typical DFMs, frequencies, and path lengths, the calculated improvement factor for dispersive fading is very high Another form of frequency diversity is crossband diversity, in which the RF carriers are in different frequency bands One great drawback to frequency diversity is the inefficient use of the available frequency spectrum, and it is prohibited in most countries In the US, the FCC limits frequency diversity to encourage spectrum conservation (FCC Part 101103(c)) The rules state that frequency diversity transmission will not be authorized in these services if the operator cannot prove that the required communications cannot practically be achieved by other means In the US, where frequency diversity is deemed to be justified on a protection channel basis, it will be limited to one protection channel for the bands 3,700 4,200, 5,925 6,425, and 6,525 6,875 MHz, and a ratio of one protection channel for three working channels for the bands 10,550 10,680 and 10,700 11,700 MHz In the bands 3,700 4,200, 5,925 6,425, and 6,525 6,875 MHz, no frequency diversity protection channel will be authorized unless there is a minimum of three working channels, except that, if there is a proof that a total of three working channels will be required within three years, a protection channel may be authorized simultaneously with the first working channel A protection channel authorized under such exception will be subject to termination if applications for the third working channel are not filed within three years of the grant date of the applications for the first working channel In the 11-GHz band (10,700 11,700 MHz), frequency diversity systems must have a minimum ratio of three working channels to each protection channel There are 12 frequency pairs in the 40-MHz channel plan and 13 frequency pairs in the 30-MHz channel plan Therefore, FCC rules will allow multiline systems of 3+1 through 12+1 in the 11-GHz band without a waiver The rules permit two parallel frequency diversity systems to be installed on the same path, as long as the 3:1 ratio of working to protect channels is maintained
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