Optimized non-unitary linear precoding for orthogonal space-time block codes

  • Authors:
  • Haiyang Huang;Gang Wu;Shaoqian Li

  • Affiliations:
  • National Key Lab of Communication, University of Electronic Science and Technology of China, Chengdu, China;National Key Lab of Communication, University of Electronic Science and Technology of China, Chengdu, China;National Key Lab of Communication, University of Electronic Science and Technology of China, Chengdu, China

  • Venue:
  • IEEE Communications Letters
  • Year:
  • 2009

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Abstract

This letter proposes a novel optimized nonunitary linear precoding design for orthogonal space-time block codes (OSTBCs). We dig out the transmission potentials by the analysis from eigen-space point of view according to the unique structure of OSTBCs. The proposed precoding form is proved to be theoretically optimized. Compared with the classical unitary Grassmannian codebook design, in the sense of restriction on the time average power of transmit signal, the proposed nonunitary codebook further improves the overall performance of practical systems. The new constraint on codebook size to guarantee full diversity order is given and proved. The advantages of our proposed design are verified in the numerical simulations.