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This paper presents a new decoder algorithm for the double space–time transmit diversity (DSTTD) system. The decoder is based on the QRD-M algorithm, which performs a breadth-first search of possible solutions tree. The search is simplified by skipping unlikely candidates, and it is stopped when no promising candidates are left. Furthermore, the search is divided into three concurrent iterations,...
In a MIMO wireless communications system, a space-time block code specifies how the data symbols are transmitted over different antennas at different time instants. A hybrid space-time code attempts to obtain some of the available diversity and multiplexing gains, achieving low error probability and high data rate. The LD StBc-VBLAST hybrid code layers one spatial-multiplexing antenna (to increase...
A simple technique to design MIMO space-time block codes that achieve both diversity and rate gains is to stack spatial multiplexing (V-BLAST) and transmit diversity (Alam-outi) encoders; these are known as hybrid codes. We increase the spectral efficiency of a simple hybrid code with one V-BLAST layer and one Alamouti layer by using spatial modulation. In spatial modulation systems, information is...
With the advent of small satellites and affordable communications hardware, there has been an increase in academic interest in space education. Small satellites are often created with an educational purpose, and they transmit strong signals that are easy to detect. They pass over large areas of the planet a few times a day, providing increased opportunities for successful communication. On the hardware...
Essentially, a software-defined radio (SDR) receiver can be described as a radio divided into two different parts. One, the analog front-end, down-converts and samples an RF wireless signal. The other, a back-end implemented in software or digital hardware, processes the samples and recovers the transmitted information, whether it is audio, video, instrumentation data, or whatever else. An SDR transmitter...
In this paper we study the use of lattice decoders in the reception of layered vertical space-time codes with square constellations. We rewrite the vertical code reception problem to make it amenable to lattice decoding. We compare the complexity and probability of error of lattice decoding with those of V-BLAST. Several properties of the behavior of lattice decoders that will have a definite impact...
Hybrid multiple-input, multiple-output (MIMO) space-time codes combine spatial multiplexing with diversity gain to achieve both high spectral efficiency and link reliability. In this work, we present two decoding algorithms, one based on ordered, successive interference cancellation (OSIC) and the other on maximum likelihood (ML), and analyze their performance and complexity towards a hardware implementation...
In this work we propose a low complexity detector for hybrid MIMO space-time codes based on linear dispersion coding. This detector is designed for systems with fewer receiver than transmitter antennas. We also present a fast, scalable hardware architecture (suitable for FPGA implementation) that performs the matrix inversion required by the detector. This architecture is based on the QR matrix decomposition,...
In this work we propose a very low complexity OSIC detector based on Sorted QR decomposition (SQRD) for signal detection in hybrid STBC-VBLAST systems where the number of receive antennas is at least equal to the number of transmit layers. The proposed detector reduces the complexity by at least 50% compared with the conventional SQRD algorithm, and uses Givens Rotations implemented using CORDIC to...
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