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Optimum Tradeoff Between Multiplexing and Diversity Gains in Widely Separated MIMO Radars

Nazari Majd, Mohammad | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49583 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Bastani, Mohammad Hasan
  7. Abstract:
  8. There are a wide variety of radar systems that one of them is MIMO Radars. After a spark in communication in 1998 that developed MIMO communication, recently there has been a great attention towards MIMO radar systems. MIMO radars divided into co-located and widely separated branch. In this thesis, the spatial diversity and multiplexing gain and the tradeoff between them in MIMO communication and MIMO radar systems investigated. Diversity and multiplexing gains in communication defined analytically, so diversity and multiplexing gain presented as detection probability improvement and throughput or capacity improvement respectively. Also tradeoff between these two gains investigated theoretically. MIMO radars references presented diversity gain in widely separated branch, but multiplexing gain was not defined. In other words, each kind of gains in detection or estimation was called as MIMO gain. This thesis goal is the declaration between these two gains. Moreover tradeoff between diversity and multiplexing gain investigated through unity signal model. Common source for tradeoff is the target radar cross section statistics in each transmitter receiver link. Application of this tradeoff in a MIMO radar system illustrated. As regards direct relationship between diversity gain and probability of detection and between multiplexing gain and parameter estimation accuracy, tradeoff between two gains will be important. In addition, conversion between these two gains dynamically, attractive in operating aspect. At first the simple and genuine signal model presented and then based on this model, diversity and multiplexing gain calculated. Multiplexing gain proposed in two bases, firstly based on communication multiplexing gain and secondly based on precision improvement. Finally tradeoff can be seen by putting diversity and multiplexing gain together. This thesis separated between spatial diversity and multiplexing gain boundaries and investigated the tradeoff between these two gains
  9. Keywords:
  10. Widely Separated MIMO Radar ; Multi-Input Multi-Output (MIMO)Radar ; Spatial Multiplexing Gain ; Spatial Diversity Gain ; Optimum Tradeoff

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