Spatial multiplexing using walsh-hadamard transform

This paper proposes a model (WHT-SMX), that combines spatial multiplexing (SMX) with Walsh-Hadamard transform (WHT). The use of WHT is to convert transmit symbols of SMX to change location of constellation points. This is helpful in extending the Euclidean distance between transmit symbols for precise detection. When phase modulation is applied on the transmit data sequences, proposed scheme shows better results compared to conventional SMX in terms of bit error rate (BER) performance. When BER is equal to 10
⁴
, a gain of around 2dB is achieved. Simulations are carried out to show that BER performance of WHT-SMX outperforms other schemes like multiple-input multiple-output (MIMO) with zero forcing (ZF) and space-time block coding (STBC).