Wireless Products
Intel® Wi-Fi Products
How Does Wireless Diversity Work?

Antenna diversity uses multiple antennas to compensate for multipath interference and improve wireless connectivity. Diversity can be in the receiving or transmitting antennas. As the radio signal is transmitted multipath causes the signal to separate into multiple signals. Because the signals take different paths they reach the receiver at different times. If there is diversity at the receiving end both antennas receive signals and the "best" signal is used. For each transmission there can be a different "best" signal and the antenna chosen as "best" can change with each transmission. Only one antenna can process the signal at a time since there is only one wireless processing device for all antennas.

Multiple-Input/Multiple-Output (MIMO) uses spatial diversity to accept multiple "best" signals simultaneously. Each antenna is able to transmit or receive signals. Where the legacy system can only accept the single "best" signal, MIMO can accept multiple signals through its multiple antennas. A MIMO access point (AP) sends multiple spatial streams from its antennas to a MIMO station that receives the signals through its multiple antennas. Performance is improved on both the transmit and receive sides of the signal.

As you increase the number of antennas on each side that can transmit or receive a spatial stream the maximum rate increases. The best scenario is to have three transmit antennas and three receive antennas using 40 MHz channel bonding at 5 GHz. With this setup the maximum theoretical speed is 450 Mbps. Actual data throughput will always be less due to WiFi protocol overhead, interference, obstructions, etc.

Note Intel recommends channel bonding be used in the 5 GHz band due to the limited number of non-overlapping channels available in the 2.4 GHz band.

This applies to:

Intel® Centrino® Advanced-N + WiMAX 6250
Intel® Centrino® Advanced-N 6200
Intel® Centrino® Advanced-N 6205
Intel® Centrino® Advanced-N 6205 For Desktop
Intel® Centrino® Advanced-N 6230
Intel® Centrino® Advanced-N 6235
Intel® Centrino® Ultimate-N 6300
Intel® Centrino® Wireless-N + WiMAX 6150
Intel® Centrino® Wireless-N 100
Intel® Centrino® Wireless-N 1000
Intel® Centrino® Wireless-N 1030
Intel® Centrino® Wireless-N 105
Intel® Centrino® Wireless-N 130
Intel® Centrino® Wireless-N 135
Intel® Centrino® Wireless-N 2200
Intel® Centrino® Wireless-N 2200 For Desktop
Intel® Centrino® Wireless-N 2230
Intel® Dual Band Wireless-AC 3160
Intel® Dual Band Wireless-AC 7260
Intel® Dual Band Wireless-AC 7260 for Desktop
Intel® Dual Band Wireless-N 7260
Intel® PRO/Wireless 2200BG Network Connection
Intel® PRO/Wireless 2915ABG Network Connection
Intel® PRO/Wireless 3945ABG Network Connection
Intel® WiFi Link 1000
Intel® WiFi Link 5300 and Intel® WiFi Link 5100 products
Intel® WiMAX/WiFi Link 5350 and Intel® WiMAX/WiFi Link 5150 products
Intel® Wireless WiFi Link 4965AGN
Intel® Wireless-N 7260

Solution ID: CS-025361
Last Modified: 01-Oct-2014
Date Created: 07-Jan-2007
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