In MIMO system of wireless communications, spacetimeblock coding (STBC) is the attractive technique for high bit-rate and high capacity transmission. Methods for providing transmit diversity in communication over fa...
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In MIMO system of wireless communications, spacetimeblock coding (STBC) is the attractive technique for high bit-rate and high capacity transmission. Methods for providing transmit diversity in communication over fading channels also been *** STBC has full diversity gain but not coding *** concatenation scheme of STBC codes and LDPC (STBC-LDPC) was proposed and it has been shown that the STBC-LDPC can achieve the good error rate performance and coding gain. Recently, low-density parity-check (LDPC) codes have attracted much attention as the good error correcting codes achieving the near Shannon limit performance like turbo codes. In this paper, a concatenation scheme of LDPC codes and Quasi orthogonal STBC which should apply full transmit rate with multiple transmit antennas is proposed. Refering to it as the *** evaluate the bit error rate (BER) of the QOSTBC-LDPC with multiple transmit antennas in a quasi-static Rayleigh fading channel by the computer simulation. We show that the BER of the QOSTBC-LDPC is better than that of the STBC with same antennas in a quasi-static Rayleigh fading channel. When receive antennas increasing ,the diversity gain will be increasing too.
This paper introduces new studies on the codes named Super Orthogonal spacetime Trellis codes (SOSTTC). Using set partitioning rules combined with a set of orthogonal designs, SOSTTC's are able to combine the cod...
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This paper introduces new studies on the codes named Super Orthogonal spacetime Trellis codes (SOSTTC). Using set partitioning rules combined with a set of orthogonal designs, SOSTTC's are able to combine the coding gain of STTC's together with diversity advantage of orthogonal STBC's. We propose new application fields of these codes in the particular context of three transmit antenna systems. We introduce new STTC's built on STBC designs that outperform some STTC's schemes based on the determinant and rank criteria. Furthermore, we demonstrate by simulation that the use of these codes in a turbo parallel concatenated scheme permits working very close to the channel outage probability.
We introduce a novel configuration for a multi-user Multiple-Input Multiple-Output (MIMO) system in mobile communication over fast fading channels using space-timeblock coding (STBC) and adaptive array. The proposed ...
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We introduce a novel configuration for a multi-user Multiple-Input Multiple-Output (MIMO) system in mobile communication over fast fading channels using space-timeblock coding (STBC) and adaptive array. The proposed scheme adopts the simultaneous transmission of data and pilot signals which reduces control errors caused by delay of obtaining channel state information (CSI). Data and pilot signals are then encoded using a space-timeblockcode and are transmitted from two transmit antennas. In order to overcome the fast fading problem, implementation of adaptive array using recursive least squares (RLS) algorithms is considered at the base station. Through computer simulation, it is shown that the proposed scheme in this way can overcome Doppler spread in higher frequencies and suppress co-channel interference up to N-1 users for N receiving antennas.
High Rate space-timeblockcodes (HR-STBCs) with greater than I symbol/transmission and simple decoding schemes are proposed. The HR-STBC demonstrates 3 dB E-b/N-o gain at BER = 10(-3) compared with the conventional S...
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High Rate space-timeblockcodes (HR-STBCs) with greater than I symbol/transmission and simple decoding schemes are proposed. The HR-STBC demonstrates 3 dB E-b/N-o gain at BER = 10(-3) compared with the conventional STBC when three transmit antennas and two receive antennas are utilized.
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