How is the range affected on 802.11n with the use of spatial multiplexing?
The purpose of spatial multiplexing is to obtain a higher information rate (relative to a non-spatially-multiplexed situation, such as a standard 802.11g radio) with the same signal-to-noise ratio (SNR) at the receiver. However, note that 802.11n radios can trade information rate for range, and vice versa. The received SNR depends entirely on the transmitted power and the environmental path loss between transmitter and receiver. Thus we have two cases: (a) if we keep the received SNR the same between an 802.11n radio vs an 802.11g radio, the range will be the same (assuming the same aggregate transmit power for both radios) but the information rate for the 802.11n radio will be substantially higher; and (b) if we keep the information rate the same for the two radios, then the 802.11n radio will be able to use many enhancements such as STBC, TBF and MRC diversity to substantially increase range over the 802.11g radio. The most common case is likely to be something in between these two c
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