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Algebraic Space-Time Codes (ASTC) for MIMO systems are based on quaternion algebras. Thanks to their algebraic construction, the ASTC codes, called the golden codes, are full-rank, full-rate and have the non-vanishing determinant property. Proposed for MIMO flat fading channels, these codes can increase the spectral efficiency and enhance the coding gain. ASTC codes maintain their proprieties for...
In this paper, we propose a new hardware-efficient ML decoding algorithm for a spatial modulation scheme which is basically constructed by serially concatenating maximum-ratio receive combiners with traditional slicers. With respect to complex multiplications, the new algorithm has a greatly reduced decoding complexity compared to the conventional one, especially, for higher-order modulation. This...
Many wireless networks are rapidly become part of our daily life. However, range and data rate in wireless devices are limited. One method is to use Multiple-Input Multiple-Output (MIMO) communication system to overcome these limitations. The multiple antennas allow MIMO systems to perform diversity coding (space-time coding), and spatial multiplexing. Beamforming consists of transmitting the same...
A new multiple-input multiple-output (MIMO) transmission scheme named\textit{ trellis coded space-shift keying} (TC-SSK) is proposed in this paper. This scheme is obtained by the combination of trellis coding and SSK for a given spectral efficiency, number of transmit antennas and trellis states. A soft decision Viterbi decoder is employed at the receiver to decode the transmitted SSK symbols. Using...
This paper proposes a high-rate spatial modulation transmission scheme based on the concept of Spatial Constellation (SC) and SC codewords introduced in [1]. In the proposed scheme, transmitted signal vectors are generated by multiplying spatial SC codewords with constellation symbols drawn from a conventional QAM or PSK constellation. The entries of SC codewords will determine how the constellation...
A Multiple Input Multiple Output (MIMO) relay assisted wireless communication system encoded with Turbo- VBLAST codes is studied in this paper. Source is equipped with multiple transmit antennas, relay is equipped with multiple transmit as well as receive antennas and destination is also equipped with multiple receive antennas. Turbo encoder encodes the input bits and then QPSK or 16 QAM or 64 QAM...
In this paper, a new peak-to-average power ratio reduction method for spatial modulation is presented. This is done by multiplying an unitary precoder to modulated signals so that total transmit energy is uniformly scattered into all transmit antennas. When using an ideal amplifier, the proposed method guarantees performance identical with the conventional scheme due to the orthogonality of the precoder...
In this paper, precoder design using LQ decomposition combined with dirty paper coding (DPC) is proposed to improve the throughput of multiuser multiple-input multiple-output (MU-MIMO) broadcast channel. The performance of MU-MIMO broadcast channel of proposed precoder is compared with SVD decomposition method, with the assumption that perfect channel state information (CSI) is available at both the...
We present a new means of implementing distributed space-time block codes (STBC) for wireless amplify-and-forward (AF) relay networks. In the proposed method, each source antenna transmits one column of an STBC matrix derived from a generalized complex orthogonal design (GCOD). Such designs were originally intended for single hop environments. At each relay antenna, a precoding matrix and a fixed...
A Gaussian wiretap channel with a helper, i.e., a cooperative jammer, is considered and its secure degrees of freedom (s.d.o.f.) is computed. Previous work showed that the s.d.o.f. is upper bounded by 1 over 2 in this model when all parties are equipped with one antenna each. In this paper, the more challenging scenario where the eavesdropper has multiple antennas is tackled. Relying on structured...
The space-time coding can provide a diversity gain for the multiple-antenna system while spatial multiplexing provides higher data rates. In this paper we are combining space-time block code (STBC) with spatial multiplexing technique over space to take advantages of both schemes. The transmit antennas are divided into groups, with one of the groups transmitting STBC code given by Alamouti and other...
Wireless communication technology has shown thatthe application of multiple antennas at both transmitter andreceiver sides improve the possibility of high data ratesthrough multiplexing or improve the performance throughdiversity as compare to single antenna systems. In this article,the BER performance of Maximum Likelihood (ML) -VerticalBells Lab Layered Space Time Architecture (V-BLAST)Spatial Multiplexing...
In this paper, two designs of blind interference alignment (BIA) with space-time codes are proposed for a two-user interference channel, where each transmitter has four antennas and each receiver has one pattern reconfigurable antenna that can switch among several preset modes. The proposed BIA schemes can align and cancel the interference by controlling the switching pattern of the reconfigurable...
Continuous phase modulation (CPM) has gained increasing attention due to its favorable trade-off between power and bandwidth efficiency. Multi-A CPM appeared as a generalization of single-A schemes so as to decrease further the need for bandwidth expansion over the wireless channel. Despite the interesting characteristics of CPM, the decoding of the received signal is particularly difficult in a multi-path...
The incorporation of multiple input multiple output (MIMO) schemes in recent wireless communication standards paved the way to exploit the newly introduced dimension (i.e. space) to efficiently cancel the interference without requiring additional resources. In this paper, we focus on multiple input multiple ouitput (MIMO) multiple access channel (MAC) case and we answer the question about whether...
Extended orthogonal space time block code (EO-STBC) schemes were demonstrated that they can achieve a significant improvement in performance for closed-loop multiple antenna systems with limited feedback channel. This paper investigates a new closed-loop multiple antenna scheme for four transmit antennas and single receive antenna under quasi-static flat Rayleigh fading. In comparison to conventional...
In this paper, we separate the symbols in the layered basis and then find the equivalent channel matrix. Based on the equivalent channel matrix we provide the grouping scheme. In our paper, we construct a block wise transmission technique which will achieve the desired code rate and reduce the decoding complexity.
We address coded spatial modulation (CSM) and present a novel approach denoted as bit-interleaved coded spatial modulation (BICSM) with iterative demodulation/decoding. The proposed transceiver architecture alleviates some drawbacks of the previously proposed CSM systems, such as being limited to a particular class of trellis codes or being effective only in limited channel scenarios. We specifically...
The investigation of MIMO technology with OFDM has recently been the focus of extensive research. The main objectives of this technology are to improve bandwidth efficiency and bit error rates. In this paper, we propose an approach for high data rate communication systems. Our approach incorporates the turbo and space-time-frequency coding approaches. The proposed space-time-frequency turbo code (STF-TC)...
In this paper, we propose a new method to transmit one more information bit by using orthogonal Space-Time Block Codes (STBC) for 4 antennas. Using two different STBCs matrices transmit one additional bit to achieve high rate-9/8. To maintain full rank and full diversity for the coding gain matrix, a new STBC code with full rate and full diversity is proposed in this letter. In order to implement...
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