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MIMO-OFDM Spatial Multiplexing Technique Implementation for GNU Radio

Multiple-Input Multiple-Output (MIMO) is a wireless technology allowing a significant increasing of the throughput without the extension of the bandwidth but by means of the use of multiple antennas both in transmission and reception.
Currently, Orthogonal Frequency Division Multiplexing (OFDM) is used in conjuction with MIMO to achieve better performance. With OFDM, instead of a single carrier, the main signal is split in a sub-set of independently modulated signals on orthogonal sub-carriers.

In this paper, we provide a description of our MIMONet SDR platform for network-level exploitation of MIMO technology. We present the implementation of our OFDM trans\-ceiver, developed following the structure of IEEE 802.11n standard and implementing one of the most powerful MIMO technique: \emph{spatial multiplexing}. In this technique, two (or more) different data streams are simultaneously transmitted over two (or more) antennas.
Starting from the original GNU Radio code, we modified and added blocks to achieve a complete implementation of
MIMO-OFDM spatial multiplexing.

We added some features, such as the concatenation of Forward Error Correction (FEC) in the packet construction, and the use of pilot sub-carriers for channel estimation.
We also developed a new synchronization algorithm derived by extending the Van de Beek algorithm to the MIMO setting.

We build the framework of the standard IEEE 802.11n. In particular, we put all the preambles needed for synchronization
and channel estimation.  We have also designed and implemented a fine grained signal-to-noise ratio (SNR) estimation, bit error rate (BER) and packet error rate (PER) computations, that allow us to evaluate the channel conditions and validate performance of the software implementation.

ACM Workshop on Software Radio Implementation Forum, Chicago, 2014

Autori esterni: Alexander Kocian (ISTI CNR), Vanessa Gardellin (Univ. Pisa)
Autori IIT:

Tipo: Articolo in Atti di convegno internazionale con referee
Area di disciplina: Information Technology and Communication Systems

Attività: Algoritmica per reti wireless