diversity gain


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diversity gain

[də′vər·səd·ē ‚gān]
(communications)
Gain in reception as a result of the use of two or more receiving antennas.
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According to Quartz,there was one important diversity gain behind the camera in 2018: more than 14 per cent of the directors of the 100 highest grossing films were black, a 200 per cent increase from 2007.
To achieve high diversity gain and coding gain, distributed space-time block codes (DSTBCs) are extensively studied in [5][6] where the relaying networks consist of multiple nodes or multiple antennas.
Cooperative communication [3-5] is a technique to overcome these drawbacks and form a virtual MIMO antenna array by utilizing relays which assist the direct communication with high diversity gain. Linear dispersion (LD) codes [6] act as an umbrella codes yielding both diversity and capacity gains for synchronous as well as the asynchronous environments.
Another metric used in the analysis of MIMO system which is related to the envelop correlation coefficient is the diversity gain which can be calculated from the formula below:
This confirms that the maximum diversity gain is obtained when the correlation coefficient is zero.
But the full diversity gain cannot be easily acquired in a poor source-relay-destination link [14].
Furthermore, it is observed that the cell throughput gained by reducing the interference-nulling effect subject to the same diversity gain becomes more conspicuous as the diversity order increases; that is, the multiplexing order decreases.
Finally, based on the correlation properties of pseudorandom spreading sequences, a remarkable diversity gain effect can be obtained using RAKE receiver under a multipath channel and a code division multiple-access (CDMA) system is available for multiuser scenarios [4].
The uncorrelated fading gains that come from the uncorrelated spatial paths, the different transmitting time slots, and the different transmitting carrier achieve the diversity gain at the receiver.
The results show that the achievable coding gain has much to do with the number and the power levels of CCI and the correlation coefficient [rho], and these factors do not affect the diversity gain.
When organizations enjoy closer alignment with the communities they serve, people feel more comfortable doing business with them, and the firms that are best able to encourage diversity gain significant competitive advantages.
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