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A differential space-time block code (DSTBC) proves to be attractive alternative to the coherent space-time block code (STBC) due to providing blind detection. This paper proposes a novel blind detection of orthogonal STBC (OSTBC) scheme using rotated QPSK constellation for four transmit antennas. The proposed encoder is represented by a super trellis diagram. At the receiver side, the Viterbi algorithm...
Multiple-Input Multiple-Output (MIMO) systems are very sensitive to carrier phase offset. In this paper, challenges regarding the provision of phase offset in orthogonal space time block codes (STBC) coded MIMO systems over Rayleigh fading channels are addressed. We develop a novel robust phase offsets estimation algorithm for MIMO systems based on STBC codes. Simulation results prove that the proposed...
Carrier-phase offset in multiple-input multiple-output (MIMO) systems is a significant practical and theoretical issue. In this paper, firstly we investigate the sensitivity of the space-time block code (STBC) to carrier-phase offset over Rayleigh flat fading MIMO channel. Then, we design an accurate third-order differential STBC (DSTBC) that allows the receiver to decode the data-symbols without...
In this paper, challenges regarding the provision of channel state information (CSI) in multiple-input multiple-output (MIMO) systems based on space time block codes (STBC) over slow time-varying Rayleigh fading channels are addressed. We develop a novel MIMO channel estimation algorithm that adopts a pilot symbol assisted modulation (PSAM) which has been proven to be effective for fading channels...
In this paper, we investigate the effect of the carrier phase offset on the performance of asymmetric M-ary shift keying (M-PSK) trellis coded modulation (TCM) over Rayleigh flat fading channel. For the purpose of comparison, the symmetric case is also discussed. A reliable low complexity non-data-aided (NDA) carrier phase recovery algorithm suited for general TCM schemes is designed here. We propose...
Carrier phase offset is known as a serious drawback for trellis coded M-PSK systems. In this paper, we investigate the sensitivity of the 8-PSK- trellis coded modulation (8-PSK-TCM) to carrier phase offset over both additive white Gaussian noise (AWGN) and Rayleigh flat fading channels. Then, we design a reliable low complexity blind carrier phase recovery algorithm suited for general TCM schemes...
This letter proposes a novel improved differential space-time block code (DSTBC) scheme. By introducing a specific redundancy mechanism, the proposed DSTBC encoder behaves as a second-order discrete Markov process that we model by a multilevel trellis diagram. At the receiver side, the well-known Viterbi algorithm is applied without channel state information (CSI). The new scheme completely compensates...
In this paper, new non-coherent space-time block code (STBC) based on concatenated inner STBC and outer four dimensional 8-PSK trellis coded modulation (4D-8-PSK-TCM) encoder is designed for quasi static Rayleigh fading channel. The code design method achieves a diversity order of 4 with two transmit and two receive antennas. Firstly, we demonstrate that the proposed 4D-TCM-STBC scheme with perfect...
We introduce and evaluate the performance of reliable fractional Fourier transform (FRFT) blocks both in the emitter and the receiver side for the four-dimensional 8-PSK-TCM previously designed for the NASA CCSDS standard. This new FRFT block makes use of weak inter correlation observed between signal and Gaussian noise in a particular FRFT plane and consequently allows near-optimal MMSE filtering...
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