18-07-2012, 01:21 PM
Power Management of MIMO Network Interfaceson Mobile Systems
Power Management.pptx (Size: 437.11 KB / Downloads: 37)
Aspirations
High data rate wireless communications links with transmission rates nearing 1 Gigabit/second (will quantify a “bit” shortly)
Provide high speed links that still offer good Quality of Service (QoS) (will be quantified mathematically)
Introduction
Conventional “Single Input Single Output” (SISO) systems were favored for simplicity and low-cost but have some shortcomings:
Outage occurs if antennas fall into null
Switching between different antennas can help
Energy is wasted by sending in all directions
Can cause additional interference to others
Sensitive to interference from all directions
Output power limited by single power amplifier
MIMO Wireless Systems
Multiple Input Multiple Output (MIMO) systems with multiple parallel radios improve the following:
MIMO networks interfaces are high speed wireless networks.
Outages reduced by using information from multiple antennas
Transmit power can be increased via multiple power amplifiers
Higher throughputs possible
Transmit and receive interference limited by some techniques
Antennas
An antenna is an electrical conductor or system of conductors to send/receive RF signals
Transmission - radiates electromagnetic energy into space
Reception - collects electromagnetic energy from space
In MIMO, each antenna can be used for transmission and reception.widley used is micro tip antenna in MIMO
MIMO Design Criterion
There are two basic types of MIMO technology:
Beam forming MIMO
Standards-compatible techniques to improve the range of existing data rates using transmit and receive beamforming
Also reduces transmit interference and improves receive interference tolerance
Spatial-multiplexing MIMO
Allows even higher data rates by transmitting parallel data streams in the same frequency spectrum
Fundamentally changes the on-air format of signals
Requires new standard (11n) for standards-based operation
Proprietary modes possible but cannot help legacy devices
Need of power management in MIMO Networks
In static mimo configuration all antennas are active so the power consumption is very high.
To avoid this we present a novel management solution for mimo network interfaces on mobile systems , called “ Antenna management”.
Antenna management
It adaptively disable a subset of antennas and their RF chains to reduce power consumption.
Antenna management dynamically determines the number of active antennas to minimize energy per bit while satisfying data rate requirement.
Antenna management can save one-end and two-end power consumption to the front end of the MIMO network interface by 21% and 13% compared to a static MIMO link that always uses all antennas.
We employ both MATLAB-based simulation and prototype-based experiment to validate the energy efficiency benefits of antenna management.
We first present an algorithm that solves the problem of minimizing energy per bit.
After that antenna management can be realized with little change to the wireless standards like 802.11n to maximize energy efficiency.
Power Management.pptx (Size: 437.11 KB / Downloads: 37)
Aspirations
High data rate wireless communications links with transmission rates nearing 1 Gigabit/second (will quantify a “bit” shortly)
Provide high speed links that still offer good Quality of Service (QoS) (will be quantified mathematically)
Introduction
Conventional “Single Input Single Output” (SISO) systems were favored for simplicity and low-cost but have some shortcomings:
Outage occurs if antennas fall into null
Switching between different antennas can help
Energy is wasted by sending in all directions
Can cause additional interference to others
Sensitive to interference from all directions
Output power limited by single power amplifier
MIMO Wireless Systems
Multiple Input Multiple Output (MIMO) systems with multiple parallel radios improve the following:
MIMO networks interfaces are high speed wireless networks.
Outages reduced by using information from multiple antennas
Transmit power can be increased via multiple power amplifiers
Higher throughputs possible
Transmit and receive interference limited by some techniques
Antennas
An antenna is an electrical conductor or system of conductors to send/receive RF signals
Transmission - radiates electromagnetic energy into space
Reception - collects electromagnetic energy from space
In MIMO, each antenna can be used for transmission and reception.widley used is micro tip antenna in MIMO
MIMO Design Criterion
There are two basic types of MIMO technology:
Beam forming MIMO
Standards-compatible techniques to improve the range of existing data rates using transmit and receive beamforming
Also reduces transmit interference and improves receive interference tolerance
Spatial-multiplexing MIMO
Allows even higher data rates by transmitting parallel data streams in the same frequency spectrum
Fundamentally changes the on-air format of signals
Requires new standard (11n) for standards-based operation
Proprietary modes possible but cannot help legacy devices
Need of power management in MIMO Networks
In static mimo configuration all antennas are active so the power consumption is very high.
To avoid this we present a novel management solution for mimo network interfaces on mobile systems , called “ Antenna management”.
Antenna management
It adaptively disable a subset of antennas and their RF chains to reduce power consumption.
Antenna management dynamically determines the number of active antennas to minimize energy per bit while satisfying data rate requirement.
Antenna management can save one-end and two-end power consumption to the front end of the MIMO network interface by 21% and 13% compared to a static MIMO link that always uses all antennas.
We employ both MATLAB-based simulation and prototype-based experiment to validate the energy efficiency benefits of antenna management.
We first present an algorithm that solves the problem of minimizing energy per bit.
After that antenna management can be realized with little change to the wireless standards like 802.11n to maximize energy efficiency.