A Multiple-Antenna System for ISM-Band Transmission

Abstract

We present a multiple antenna system for industrial, scientific, and medical (ISM)-band transmission (MASI). The hardware demonstrator was developed and realized at our institute. It enables multiple-input multiple-output (MIMO)-communication applications and is capable of transmiting arbitrary signals using 8 transmit and 8 receive antennas in parallel. It operates in the 2.4 GHz ISM-band. The hardware concept is introduced and some design specifications are discussed. Using this transmission system, we present some measurement results to show the feasibility of MIMO concepts currently under discussion. The applications include transmit and receive diversity for single carrier and OFDM as well as blind source separation (BSS) techniques

Iterative pre-compensation of I/Q imbalances in an adaptive 2.4 GHz MIMO-OFDM system

“…For real system measurements an enhanced directconversion based multiple antenna system called MASI-2 originally presented and described in detail in [23] and firstly [22] is used. With it, a verification of simulation results in a real transmission with general impairments like synchronization and timing aspects is possible.…”

“…In the MASI-2 system the Tx/Rx chains are connected to a single-poledouble-throw (SPDT) switch, which allows for time duplex switching. Each Tx/Rx chain has its own front-end due to the modular architecture [23]. Now, a 2×2 transceiver system with antenna spacing λ/2 is available that can be used to investigate adaptive MIMO schemes in time division duplex (TDD) mode.…”