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). Theoretically, the 1Gbps barrier can be achieved using this configuration if you are allowed to use much power and as much BW as you so please! Extensive research has been done on SISO under power and BW constraints. A combination a smart modulation, coding and multiplexing techniques have yielded good results but far from the 1Gbps barrier. | Multiple-Input-Multiple- Output (MIMO) Systems Basic principles, Algorithms and Networking Applications HARISH GANAPATHY Topics Motivations for the development of MIMO systems MIMO System Model and Capacity Studies Design Criterion for MIMO Systems (Diversity Vs Spatial Multiplexing) Some actual architectures based on these criterion MIMO-OFDM Networking Applications: MAC protocol for MIMO PHY layer Conclusions 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) Aspirations (Mathematical) of a System Designer High data rate Quality Achieve “Channel Capacity (C)” Minimize Probability of Error (Pe) Real-life Issues Minimize complexity/cost of implementation of proposed System Minimize transmission power required (translates into SNR) Minimize Bandwidth (frequency spectrum) Used Antenna Configurations Single-Input-Single-Output (SISO) antenna system Theoretically, the 1Gbps barrier can be achieved using this configuration if you are allowed to use much power and as much BW as you so please! Extensive research has been done on SISO under power and BW constraints. A combination a smart modulation, coding and multiplexing techniques have yielded good results but far from the 1Gbps barrier channel User data stream User data stream MIMO Antenna Configuration User data stream User data stream . . 1 2 MT . . . 1 2 MR . . . . . channel Use multiple transmit and multiple receive antennas for a single user Now this system promises enormous data rates! Data Units Will use the following terms loosely and interchangeably, Bits (lowest level): +1 and -1 Symbols (intermediate): A group of bits Packets (highest level): Lots and lots of symbols Shannon’s Capacity (C) Given a unit of BW (Hz), the max error-free transmission rate is C = log2(1+SNR) bits/s/Hz Define R: data rate (bits/symbol) RS: | Multiple-Input-Multiple- Output (MIMO) Systems Basic principles, Algorithms and Networking Applications HARISH GANAPATHY Topics Motivations for the development of MIMO systems MIMO System Model and Capacity Studies Design Criterion for MIMO Systems (Diversity Vs Spatial Multiplexing) Some actual architectures based on these criterion MIMO-OFDM Networking Applications: MAC protocol for MIMO PHY layer Conclusions 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) Aspirations (Mathematical) of a System Designer High data rate Quality Achieve “Channel Capacity (C)” Minimize Probability of Error (Pe) Real-life Issues Minimize complexity/cost of implementation of proposed System Minimize transmission power required (translates into SNR) Minimize Bandwidth (frequency spectrum) Used Antenna .
