When 802.11 was introduced, multiple data rates have been supported. Every wireless adapter has defined minimum received signal and minimum SNR level. The following Table shows in vendor recommendations.
above the picture from CWAP
The Client station radios move away from an access point, they will shift down to lower bandwidth capabilities by using a process known as dynamic rate switching(DRS). The following picture shows the correlation between signal quality and distance from the AP. As a result, transmissions between tow 802.11b radio cards may be at 11 Mbps at 30 feet but at 2 Mbps at 150 feet.
above the picture from CWAP
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