Title :
Adaptive modulation in MIMO system under power and QoS constraints
Author :
Jie Hu ; Xianzhong Xie ; Shuangping Huang
Author_Institution :
South China Agric. Univ., Guangzhou
Abstract :
A bit loading and power allocation algorithm for multiple-input multiple-output (MIMO) systems under average transmit power and QoS constraints is proposed. The truncated right unitary matrix as precoder at transmitter and truncated left unitary matrix as decoder at receiver which are obtained by singular value decomposition (SVD) choose variable eigen-subchannels to carry Bell Laboratories Layered Space-Time (BLAST) codes with variable layers. We compare the average spectral efficiency (ASE) of our scheme with the other two adaptive modulation (AM) systems-continuous rate (CR) system and instantaneous power constraint (IPC) system. Performance is investigated by simulation results.
Keywords :
MIMO communication; adaptive modulation; eigenvalues and eigenfunctions; quality of service; singular value decomposition; space-time codes; wireless channels; Bell Laboratories layered space-time codes; MIMO channel; QoS constraint; adaptive modulation system; average spectral efficiency; bit loading algorithm; continuous rate system; eigen-subchannel; instantaneous power constraint system; multiple-input multiple-output channel; power allocation algorithm; singular value decomposition;
Conference_Titel :
Communications, Circuits and Systems, 2007. ICCCAS 2007. International Conference on
Conference_Location :
Kokura
Print_ISBN :
978-1-4244-1473-4
DOI :
10.1109/ICCCAS.2007.6250077
