Milan Zivkovic

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— This work is inspired by the question " Can 100 speakers talk for 30 minutes each in one room within one hour and with zero interference to each other's audience? " posed by Cadambe and Jafar at the 45th Allerton conference 2007, see [1]. We consider the problem of how many transmitter-receiver pairs can be placed such that each desired link may use half(More)
Optimal utilization of radio resources (bandwidth, transmit power) in multicarrier based systems becomes very challenging due to coexistence of various wireless standards within the same frequency band. Proposed demonstration, implemented in GNU Radio framework, enables capacity achieving OFDM-based data transmission between two network nodes with optimally(More)
—In this paper, the performance of Schmidl and Cox (S&C) timing estimator in cognitive radio systems under a fractional bandwidth (FBW) scenario is investigated. The synchronization preamble is appropriately modified in order to avoid transmission in the subbands where primary users (PU) are active. However, at the receiver, the timing synchronizer(More)
—Orthogonal frequency division multiplexing (OFDM) offers high data rates and robust performance in frequency selective channels by link adaptation utilizing information about the channel quality. Combined with multiple-input multiple-output (MIMO) technique it provides improved link reliability and increased data rate. A crucial parameter required for(More)
The optimization of wireless orthogonal frequency division multiplexing (OFDM) systems is based on the knowledge of the signal-to-noise ratio (SNR). Most of the existing methods for the SNR estimation operates in the frequency-domain and assumes perfect carrier frequency offset (CFO) synchronization. However, it has been shown that in real systems in the(More)