QOSTBCQuasi-Orthogonal Space-Time Block Code
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The resultant new channel matrix and QOSTBC encoding matrix be given as in following [17].
Table 1: Simulation Parameters Parameters Values IFFT/FFT Size 256 Number of active sub-carriers 192 Cyclic prefix length 32 Number of guard bands 28 high, 27 low Number of pilots 8 DC null 1 Modulation schemes QPSK, 16 QAM Channel model Rayleigh fading channel Channel Coding CC with constraint length = 7, rate=1/2 and Interleaving RS (63, 31) code over GF (26) and interleaver concatenated (RS-CC) and interleaver Space Time Coding type Dama QOSTBC Antennas transmitted Power Equally Receiver detection schemes MRC Table 2: 3x1 Dama QOSTBC-OFDM system performance compared with coded system SNR for Proposed System (dB) Modulation BER SNR for RS CC RS-CC used uncoded system (dB) QPSK [10.
The QOSTBC matrix loses full diversity when information exchange has errors.
Four scenarios at the same transmission rate of 2 bits/sec/Hz (the same assumption is in QOSTBC papers [14] [16][17]) are considered in the simulation:
QOSTBC with error in information exchange: it uses a rate 1 QOSTBC matrix without information exchange mitigation and QPSK modulation.
DQOSTBC: it uses a rate 1 QOSTBC matrix and QPSK modulation.
2-4, scenario 1 (a QOSTBC with error in information exchange) is also shown for comparison.
The simulation results show that the proposed full rate full diversity DQOSTBC scheme has lower BER than the QOSTBC with error in information exchange (not full diversity).