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In the conventional Space-Time Block Code (STBC) scheme, system can't achieve the full diversity and full rate for more than two transmitting antennas. Thereafter, a Quasi-Orthogonal STBC (QOSTBC) has been provided to improve the diversity and full rate behavior for the STBC with more than two transmitting antennas. However, QOSTBC has the drawback of heavy computational burden for the receiver. This...
Alamouti codes have been widely recognized for their full-diversity performance, while they provide a symbol rate of one with symbol-by-symbol decoding complexity. To decode an Alamouti code, the receiver requires the channel state information (CSI), while the transmitter operates blindly without CSI. This paper investigates the dual scenario when CSI is available only at the transmitter and not at...
In this paper, we introduce a low decoding complexity space-time modulation scheme that achieves full transmit diversity without the need of channel knowledge at the transmitter (Tx) nor at the receiver (Rx). The scheme is based on differential encoding of a low-complex quasi-orthogonal space-time block code (STBC). The idea of the differential encoding is based on mapping the original system to an...
Improving system capacity is always a hotspot in mobile communication systems. As an important space-time code, Vertical Bell lab Layered Space-Time (V-BLAST) code detection algorithm has attracted much attention in recent years. Sphere Decoding (SD) is comparable to ML in performance and much better than traditional detection algorithm of V-BLAST but it involves much more complicated computations...
In this paper, we derive few new quasi-orthogonal space-time block codes for four transmit antennas. These codes differ from each other and existing codes in character matrices and/or correlated values in character matrices. These codes can be constructed using elementary sub-matrices. We also derive corresponding maximum-likelihood decoders for the proposed codes. We observe that decoding complexity...
Recently, several papers have been concentrating on reducing the decoding complexity of high-rate space-time codes. While the research has led to some impressive reductions in decoding complexity, the geometric methods so far used appear to have faced some fundamental limits. In this paper, we study what happens if we let go of the assumption of full diversity and study the possibility of reducing...
In this paper, a simple design of a linear dispersive space-time-frequency (STF) code is proposed with a design criterion to achieve high rate for frequency-selective channels in terms of multipath when the Partial Interference Cancellation Group (PIC) group decoding is applied at receiver. With an appropriate grouping scheme as well as the PIC group decoding, the proposed STF code is shown to obtain...
Hybrid concatenated code is a combination of parallel and serial concatenated codes. In this paper, two hybrid concatenated super-orthogonal space-time trellis code (SOSTTC) applying iterative decoding is proposed for flat fading channels. The encoding operation is based on the concatenation of convolutional codes, interleaving and super-orthogonal space-time trellis codes. The first concatenated...
Space Time Trellis Code is based on a combination of the delay diversity and the TCM Codes. It is helpful to use Space Time Trellis Code to improve the wireless transmission rate and the reliability. The model, the encoding method and the decoding algorithm of the Space Time Trellis Code systems are discussed in this paper. Then, the trellis of Space Time Trellis Code is analyzed and the coding process...
For cellular networks, the increased cell density and decreased cell size will give rise to significant inter-cell interference. In this work, an adaptive antenna array and an iterative receiver are combined to facilitate inter-cell interference suppression and cancellation at the receiver end. Iterative receivers exchange soft information between different receiver modules, e.g., symbol detector...
A new kind of full rate full diversity space time code is proposed to obtain transmit diversity gain in frequency selective channels. The code is named space time interleaving code (STIC) due to interleaving of symbols at different antennas. It is shown that STIC with random interleavers satisfies full diversity criteria in frequency selective block fading channel. Moreover, interleavers embedded...
The recent advancement in the computational power made it possible to use the powerful error correcting codes such as the turbo codes with the Space-Time Coding (STC) to provide both coding gain and diversity gain to the wireless communication systems to improve the error rate performance at very low signal-to-noise ratios (SNRs). In this paper, we propose a technique to improve the error rate performance...
This paper investigates a space time turbo trellis codes (ST Turbo TC). Increasing the number of receiver antennas from two to three gives a gain about 2 dB at the FER 10−. The number of transmit antennas grow from two to three which gives a gain about 3 dB at the FER 10−.nA bigger interleaver size yields a higher diversity which brings a weight symbol distribution. The ST turbo TC scheme is insensitive...
In this paper we consider a practical orthogonal frequency division multiplexing (OFDM) modulated and low-density parity-check (LDPC) channel coded two-way relay system employing physical-layer network coding (PLNC), where two terminals A and B desire to exchange information with each other with the help of a relay R which can be equipped with multiple receive antennas. Orthogonal frequency division...
Orthogonal frequency division multiplexing (OFDM) is a very popular modulation scheme because it requires a very simple receiver in transforming a frequency-selective channel into multiple flat-fading channels. Furthermore, multiple-input-multiple-output (MIMO) OFDM systems employing transmit diversity techniques, such as space-time (ST) and space-frequency (SF) coding, increase robustness and reliability...
In this paper, a novel decoder for underdetermined MIMO systems with low decoding complexity is proposed. The development of the proposed decoder consists of two stages. First, an improved slab decoding algorithm efficiently obtains all valid candidate points within a given slab. Next, a multi-slab based decoding algorithm finds the optimal solution by conducting intersections on the obtained candidate...
Firstly, this paper gives a simple introduction of the encoding/decoding theory of LDPC and Space-time coding. And it carries out a detailed research and analysis on LDPC coding system and the space-time block coding system. Then, LDPC and space-time coding are combined. The performance of LDPC-STBC under AWGN channel is given through computer simulation. The simulation results show that this method...
Turbo equalization schemes based on minimum mean square error (MMSE) criteria available in the literature for multiple-input multiple-output (MIMO) systems are computationally expensive, as they require a relatively large matrix inversion. In this paper, we propose a low complexity turbo equalization (TE) scheme with successive interference cancellation for orthogonal frequency division multiplexing...
In a distributed MIMO system (D-MIMO), multiple base stations work in cooperation manner to enhance system throughput by suppressing inter-cell and inter-user interference. In this paper, we propose two practical distributed algorithms that are based on block diagonalization technique. The proposed schemes eliminate the need of iterative computations, and hence can be implemented without information...
A new joint channel-coding, modulation and space-time coding scheme is proposed as a new multi-antenna Multi-Input Multi-Output (MIMO) scheme called “Matrix Coded Modulation” or “MCM”. The existing non-coherent schemes such as the Differential Space-Time Modulation (DSTM) leads to performance degradation compared to coherent systems in which perfect channel state information (CSI) is assumed. Decoding...
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