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Cooperative relay has been an interesting research area for the past years as it promotes higher data rates and robust to wireless environment. IEEE Work Group initiated the use of relay stations in the IEEE 802.16e standard and it is called IEEE 802.16j. This paper proposed a multi-hop cooperative relay system with space-time codes (STC), with the integration of relay selection. In changing environment,...
In the IEEE 802.16d Orthogonal Frequency Division Multiplexing (OFDM) physical layer protocol, which provides the Space-Time Coding (STC) scheme to improve system performance, it is possible to get a better performance in resisting multipath fading and increasing bandwidth efficiency. However, in projects, using Multiple-Input Multiple-Output (MIMO) multiple-antenna technology is usually inconvenient...
In this paper we study the performance of space-time bit-interleaved coded modulation (ST-BICM) over block-fading multi-input multi-output (MIMO) channels with iterative receivers based on minimum mean square error (MMSE) detection. We show how full diversity can be achieved with a special class of space-time precoders. Performance in terms of symbol error rate (SER) and word error rate (WER), obtained...
Orthogonal space-time block code (OSTBC) can greatly improve transmit speed rate and mitigate the effect caused by atmospheric turbulence, furthermore it can reduce the error rate in the wireless optical communication system. In this paper, the model of the multiple input multiple output (MIMO) wireless optical communication about the Gaussian channel is proposed. And an orthogonal space-time block...
In this paper we have investigated the performance of generalized layered space time codes (GLST) under the assumption of spatial correlated fading channels, where the architecture of distributed antenna system (DAS) has been considered. Motivated by previous study, here we have used basis vector from null space instead of orthogonal set to obtain the same system performance but with lower complexity...
This paper is focused on the study of layered space-time-frequency (LSTF) architectures with channel coding for orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) multiplexing systems for high speed wireless communications over a frequency-selective fading channel. In order to achieve the available spatial, temporal and frequency diversities, and also make the...
We present a novel approach to designing space-time codes based on a tensor precoding model. This proposed scheme can achieve full diversity at full transmission rate on the assumption of quasi-static flat fading channels. We describe a unified approach to design criteria exploiting the parallel factor (PARAFAC) tensor decomposition to express the precoding tensor in terms of a set of component matrices...
We propose a superimposed pilot-based channel estimation scheme for frequency-flat block fading multiple-input multiple-output (MIMO) channels. The superimposed pilot (SIP) is designed to be orthogonal to the transmitted data matrix, and the orthogonal property is obtained by exploiting the random space-time symbol interleaver at transmitter. Since the pilot and data can be totally decoupled, the...
Based on the analysis of the technical principles and the system model of the MIMO and OFDM technologies, a simple DVB-T wireless communication system is constructed. The system is composed of transmitter, channel, receiver, and so on. Space-time coding is done in the transmitter, the signal is launched after OFDM modulation, and the process of the receiver is the inverse process of the transmitter...
Generalized selective combining (GSC) is a hybrid diversity technique involving first selective combining (SC) followed by maximal ratio combining (MRC). In this paper we study a new technology based on bit log-likelihood ratio (BLLR) which is better than the traditional GSC based on signal-to-noise ratio (SNR) in performance. WCDMA is one of the key technologies of the third-generation mobile communication...
In recent years, MIMO MC-CDMA system was extensively studied, its uplink synchronization model using space-time block coding (STBC) is described in time-varying multi-path fading environment, a new multi-user detection algorithm based on MBER (minimum bit error rate) was proposed for it. The algorithm can be realized using kernel density estimation and gradient descent methods. Simulation results...
We study the symbol error rate (SER) analysis for the zero-forcing detection with successive interference cancellation (ZF-SIC) in the spatial division multiplexing space time block coded (SDM-STBC) MIMO system. Independent identically Rayleigh fading MIMO channel is considered. Relying on the results obtained from matrix variate distribution, we evaluate the SER for the ZF and ZF-SIC detection in...
Transmission environment of mine laneway is non-free, wireless communication reliability is reduced by multi-path fading. MIMO can efficiently overcome multi-path fading, but MIMO channels in mine laneways have strong correlation. In this paper, the performances of space-time code in mine laneway are investigated, and the pair wise error probability (PEP) about mine laneway is analyzed. Following...
In this paper, a 4-transmit-antenna space time block coding (STBC) scheme with 1-bit differential feedback is proposed. This scheme gives full transmit diversity and spatial coding rate over time-selective fading channels by rotating the signal constellations for certain angles determined by the differential feedback information. By utilizing differential feedback, our method can provide much better...
In this paper, we study coding techniques for the multiple-input multiple-output multi-hop amplify-and-forward (MIMO-MH-AF) block-fading channel. We first derive conditions on coding rates and space-time precoders that allow a coded modulation to achieve the diversity order provided by the channel. We then derive a bound on the diversity order of a coded modulation so as to attain maximum diversity...
Unitary space-time modulation (USTM) is ideally suited for rapid fading scenarios, where neither the transmitter nor the receiver have the channel state information (CSI). However, it has received limited attention compared with the space-time coding schemes that need CSI. An important reason for that is USTM needs too large calculation amount when meeting with a large size constellation. We propose...
In this paper, Space-Time Block Codes (STBCs) with low Maximum-Likelihood (ML) decoding complexity and information-losslessness property are proposed for a two-user Multiple-Input Single-Output, frequency-flat fading multiple access channel. In particular, two distinct classes of STBC pairs which are derived from the well known class of real orthogonal designs are proposed. The first class of code...
The performance of a wireless communication system is analyzed considering multi-carrier OFDM with Multiple- Input-Multiple-Output (MIMO) wireless channel and Space-Time Block Coding (STBC). Bit Error Rate (BER) expression for MIMO-OFDM system without and with STBC is presented considering fading and timing jitter with QPSK, DPSK and DQPSK modulation schemes. The performance results are evaluated...
In this paper, we consider a MIMO multiuser system in a multipath fading channel. We design a blind receiver for a differential space-time coded modulation. A linear estimator projects the received signal onto the same subspace of the MMSE filter. The system works because of the differential encoding of the information matrices. Numerical results show that the blind receiver has the same performance...
In this paper, Space-Time Block Codes (STBCs) with reduced Sphere Decoding Complexity (SDC) are constructed for two-user Multiple-Input Multiple-Output (MIMO) fading multiple access channels. In this set-up, both the users employ identical STBCs and the destination performs sphere decoding for the symbols of the two users. First, we identify the positions of the zeros in the R matrix arising out of...
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