On Optimum Power Allocation for Multi-Antenna Wideband Helicopter-to-Ground Communications
BRIGHAM YOUNG UNIV PROVO UT DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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This paper introduces a generalized version of time-reversed, space-time block codes TR-STBCs, called GTRSTBCs that operates with non-equal power allocation between two inter-symbol interference ISI channels in a 2 transmit, 1 receive antenna helicopter-to-ground radio link. The power allocation is parameterized by rho, the portion of the total available power allocated to channel 1. The criteria for selecting the optimum rho is minimizing the residual mean-squared error at the MMSE equalizer output. GTR-STBC is applied to measured channel impulse responses and a simple statistical channel model. The results show that 1 the optimum value of rho gives the best tradeoff between signal-to-noise ratio and ISI 2 equal power allocation may not be the optimum power allocation when channel side information is available and 3 the optimum profile of rho over measured channels is significantly different than from that in statistical channel models.
- Radio Communications