Uncoded space-time labeling diversity (USTLD) is a recent scheme that improves the error performance of space-time block-coded wireless communication links. However, the existing space-time labeling diversity technique used in USTLD only employs two transmit antennas. To further improve error performance in USTLD systems, this paper investigates USTLD systems with three transmit antennas. A heuristic approach is proposed to design the second and third mappers. Simulation results show superior error performance compared with the existing two transmit antenna USTLD. Furthermore, an analytical expression for a tight bound of the average bit error probability of the proposed system with three transmit antennas is derived. Moreover, complexity reduction analysis of the low-complexity (LC) detector is proposed. It is shown that the proposed LC algorithm achieves near-maximum likelihood detection accuracy, while reducing complexity by 51% and 96.5% for 16QAM and 64QAM, respectively.

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