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This paper proposes an index modulation-based transceiver design termed transmit antenna selected space-time block coded enhanced spatial modulation with flexible coefficients (TAS-STBC-ESM(F)). A new 1024-QAM signal design based on multiple constellations and a codebook design that uses flexible coefficients and rotation angles are proposed. A new detection scheme, namely, Iter-BLAST, for generalized detection is introduced, and its complexity is analyzed. For 20 bpcu, the TAS-STBC-ESM(F) transmitter with Iter-BLAST, ML, Iter-LC-LORD, and compressed sensing-based detection schemes is studied over the &#x03B1; - &#x03BC; fading channel. Closed-form expressions for the ABEP, outage probability, and capacity of the proposed system are derived. The introduction of flexible coefficients, antenna selection methods, and multiple constellations in the transmitter design shows a 5.5-dB improvement over an enhanced spatial modulation (ESM) system and a 3-dB improvement over the STBC-ESM system. For a 20 bpcu, 64&#x00D7;64 MIMO system, the floating point operations of the CS-based ESM detection algorithm are 13.9 times those of Iter-BLAST, and the error performance improvement is 10.8%. The proposed transceiver design will be a promising solution for 5G and massive MIMO that addresses the tradeoff between spectral and energy efficiencies.

Design of a TAS-STBC-ESM(F) Transceiver and Performance Analysis for 20 bpcu