Wireless Communications From The Ground Up- An ...

Wireless communication also has some challenges and limitations, including:

MIMO uses multiple antennas at both the transmitter and receiver. By bouncing different data streams off walls and obstacles simultaneously, a MIMO system can untangle these streams at the receiver using complex algorithms. This effectively multiplies the speed of the connection without needing more spectrum. Wireless Communications from the Ground Up- An ...

Real systems use which combines amplitude and phase changes to encode multiple bits per symbol. For instance, 16-QAM carries 4 bits per symbol, while 256-QAM carries 8 bits—yielding much higher data rates, but requiring cleaner signal conditions. 16-QAM carries 4 bits per symbol