An apparatus comprising: a controller comprising logic and circuitry configured to cause an Enhanced Directional Multi-Gigabit (EDMG) wireless communication station (STA) to: generate a plurality of space-time streams, the plurality of space-time streams comprising at least a first space-time stream and a second space-time stream according to a Single Carrier (SC) symbol blocking structure and a Space Time Block Code (STBC) characterized in that the first space-time stream comprises a first Guard Interval (GI) between first and second data symbol blocks of the first space-time stream , and the second space-time stream comprises a second GI between first and second data symbol blocks of the second space-time stream , the first GI comprises a first Golay sequence and the second GI comprises a second Golay sequence different from the first Golay sequence, wherein the first data symbol block of the first space-time stream comprises a first data sequence , the second data symbol block of the first space-time stream comprises a second data sequence , the first data symbol block of the second space-time stream comprises a sign inverted complex conjugate of the second data sequence with reverse order, and the second data symbol block of the second space-time stream comprises a complex conjugate of the first data sequence with reverse order; and transmit a SC transmission based on the first and second space-time streams (406; 408) in a frequency band above 45 Gigahertz (GHz). generate a plurality of space-time streams, the plurality of space-time streams comprising at least a first space-time stream and a second space-time stream according to a Single Carrier (SC) symbol blocking structure and a Space Time Block Code (STBC) characterized in that the first space-time stream comprises a first Guard Interval (GI) between first and second data symbol blocks of the first space-time stream , and the second space-time stream comprises a second GI between first and second data symbol blocks of the second space-time stream , the first GI comprises a first Golay sequence and the second GI comprises a second Golay sequence different from the first Golay sequence, wherein the first data symbol block of the first space-time stream comprises a first data sequence , the second data symbol block of the first space-time stream comprises a second data sequence , the first data symbol block of the second space-time stream comprises a sign inverted complex conjugate of the second data sequence with reverse order, and the second data symbol block of the second space-time stream comprises a complex conjugate of the first data sequence with reverse order; and the first space-time stream comprises a first Guard Interval (GI) between first and second data symbol blocks of the first space-time stream , and the second space-time stream comprises a second GI between first and second data symbol blocks of the second space-time stream , the first GI comprises a first Golay sequence and the second GI comprises a second Golay sequence different from the first Golay sequence, wherein the first data symbol block of the first space-time stream comprises a first data sequence , the second data symbol block of the first space-time stream comprises a second data sequence , the first data symbol block of the second space-time stream comprises a sign inverted complex conjugate of the second data sequence with reverse order, and the second data symbol block of the second space-time stream comprises a complex conjugate of the first data sequence with reverse order; and transmit a SC transmission based on the first and second space-time streams (406; 408) in a frequency band above 45 Gigahertz (GHz). <EOS>