25-06-2012, 11:18 AM
Power Management Of MIMO Network Interface On Mobile System
Power Management Of MIMO Network.pptx (Size: 325.28 KB / Downloads: 64)
ABSTRACT
High-speed wireless network interfaces are among the most power-hungry components on mobile systems.
This is particularly true for multiple-input-multiple-output (MIMO) network interfaces which use multiple RF chains simultaneously.
In this power management solution for MIMO network interfaces on mobile systems, called antenna management.
EXISTING SYSTEM:-
802.11n, WiMAX
The key idea of MIMO is to simultaneously use multiple antennas at the transmitter and receiver.
MIMO -- power consumption
The circuit power increase is particularly problematic for short-range communication scenarios such as 802.11.
PROPOSED SYSTEM:-
Improving the channel quality.
Antenna management.
MIMO:-
Multiple-input multiple-output (MIMO) systems are a natural extension of developments in antenna array communication.
Improve communication performance.
MIMO increases in data throughput.
It achieves this goal by spreading the same total transmit power over the antennas
MIMO ------IEEE 802.11n (Wifi), WiMAX.
MIMO ENERGY PER BIT MINIMIZATION:-
MIMO energy per bit Eb , can be calculated as the power consumption P divided by the data rate R.
First, pair of battery-powered mobile nodes.
Second, the data rate supported by the MIMO channel.
We add an important constraint to the optimization problem R≥Rmin.
First, given that H and Rmin , finite optimal transmit power, PTX_OPT.
Second, each ω yields an unique channel matrix H(ω) and thereby a unique optimal transmit power PTX_OPT(ω).
ALGORITHMIC DESIGN OF ANTENNA MANAGEMENT:-
Antenna management leverages two key techniques.
Pre-Built Mapping:-
A mapping from each (NT,NR) to PTX_OPT can be built offline using measured channels.
First to compute PTX_OPT for each measured channel matrix (NT,NR) with various NT and NR.
Good PTX_appx is, we compare the MIMO energy per bit using PTX_appx and PTX_OPT for a large number of antenna and measured channels (1000 each).
MIMO -----PTX_appx is only 1.3% and 1.6% higher than that using PTX_OPT