Statistical rate allocation for layered space-time structure

Research output: Contribution to journalArticle


We propose a modified layered structure for multiple-input multiple-output systems, where the layer detection order is fixed and the data rate for each layer is allocated based on the detection order and channel statistics. Using a Gaussian approximation of the layer capacities, we derive an asymptotic optimum data-rate-allocation approach. For optimum data-rate allocation, the amount of backoff from the mean layer capacity is proportional to the standard deviation of the layer capacity. With statistical data-rate allocation, only limited channel feedback is needed to update channel statistics at the transmitter. Simulation results show significant performance improvement with the proposed algorithm. We also find that the performance gap between the layered structure and the channel capacity diminishes with increasing ergodicity within each codeword. Numerical results show a singal-to-noise ratio improvement of 6.3 and 3.6 dB for TGn channels "B" and "D," respectively, for 1 % outage probability and 9 b/s/Hz spectral efficiency.


  • Jianxuan Du
  • Ye (Geoffrey) Li
  • Daqing Gu
  • Andreas Molisch
  • Jinyun Zhang
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • rate allocation, vertical, multiple-input multiple-output orthogonal, frequency-division multiplexing (MIMO-OFDM), layered space-time coding, Bell Labs layered space-time (V-BLAST)
Original languageEnglish
Pages (from-to)489-496
JournalIEEE Transactions on Communications
Issue number3
Publication statusPublished - 2007
Publication categoryResearch