Adaptive Transmission Using Channel Inversion for Multiple-Antenna Systems

channel inversion;outage capacity;truncated channel inversion;turbo trellis-coded modulation;MIMO channels;adaptive transmission

James, Chris Mary ; Brian L. Hughes, Committee Chair,J. Keith Townsend, Committee Member,Rudra Dutta, Committee Member,James, Chris Mary ; Brian L. Hughes ; Committee Chair ; J. Keith Townsend ; Committee Member ; Rudra Dutta ; Committee Member

University:North Carolina State University

关键词: channel inversion;    outage capacity;    truncated channel inversion;    turbo trellis-coded modulation;    MIMO channels;    adaptive transmission;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/1404/etd.pdf?sequence=1&isAllowed=y

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【 摘 要 】

Adaptive modulation often achieves a significantly higher capacity than nonadaptive modulation in multiple-antenna wirelesscommunication systems, particularly when the transmit antennas outnumber the receive antennas. Adaptive modulation generally involves varying signal power, constellation and coding in response to changing channel conditions, which addsconsiderable system complexity. This thesis examines simpler adaptive transmission schemes based on channel inversion (CI) andtruncated channel inversion (TCI) in combination with multi-dimensional eigen-beamforming. Optimal CI and TCI schemes for multiple-antenna systems are derived and it is shown that these schemes suffer a small loss in capacity relative to optimaladaptive modulation, even for relatively small antenna arrays. This thesis also considers a practical coding scheme, turbo trellis-coded modulation (TTCM) in conjunction with CI. The results indicate that this scheme can perform within 4 dB of the optimal adaptive capacity.