Numerical recipes in C (2nd ed.): the art of scientific computing
Numerical recipes in C (2nd ed.): the art of scientific computing
Mapping of 40 MHz MIMO SDM-OFDM Baseband Processing on Multi-Processor SDR Platform
DDECS '08 Proceedings of the 2008 11th IEEE Workshop on Design and Diagnostics of Electronic Circuits and Systems
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
From theory to practice: an overview of MIMO space-time coded wireless systems
IEEE Journal on Selected Areas in Communications
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In the recent wireless systems, MIMO technologies are largely used to increase data throughput. Many efficient solutions have been proposed for the classical 2 transmitting and 2 receiving antennas (2×2) configuration, such as: the Spatial Multiplexing (SM) and the Alamouti's Space Time Block Coding (STBC). The extension of these techniques in terms of antennas number is a key topic in MIMO signal processing. In these cases, the computational burden increases due to the large number of elementary operations. Moreover, additional interference due to the non-perfect orthogonality of space-time coding may affect the decoder. In this paper an SDR implementation of a 4×4 STBC configuration for MIMO-OFDM systems is considered. The aim is to introduce a low-complexity algorithm which reduces the interference due to the Quasi-Orthogonality of the STBC decoding. In the literature, feedback techniques have been proposed to solve this problem. However, the algorithm introduced in this paper has been conceived in order to avoid the transmission feedback, by estimating the interference factors and removing them. The related STBC decoder has been implemented on FPGA. The considered algorithm exhibits a low computational complexity and complies with the requirements of HW feasibility, considering the execution time/area occupation trade-off.