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Space-time coded wireless transmission techniques with multiple transmit and receive antennas can provide considerable increases in both the link quality as well as link capacity when compared to ordinary single-antenna techniques. However, multiantenna transmission basically calls for multiple parallel radio implementations, and the resulting link(More)
In multi-antenna transmission systems, multiple parallel radio implementations are needed. To keep the overall transceiver implementation feasible, this poses big restrictions on the size and cost of individual radios, resulting in various imperfections in the analog radio front-ends. One good example is the so-called I/Q imbalance problem related to the(More)
The combination of orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) techniques has been widely considered as the most promising approach for building future wireless transmission systems. In such systems, the limited implementation resources for the radio parts cause big restrictions on the size, cost, and quality(More)
One of the key trends in the design of radio receivers and other wireless devices is to shift more and more of the transceiver functionalities to digital signal processing (DSP). At the same time, the demands on the remaining analog circuits are greatly increased, especially with lower power supplies and nanoscale technology effects such as variability.(More)
Ambient Media describe media environments, where the medium is embedded within the natural environment. They follow the anytime, anywhere, and anyhow principle for media access. The Nokia Ubimedia MindTreks Awards have been established a few years ago to explore the potential of ambient media. In this article we analyze the total project portfolio submitted(More)
This article addresses the signal distortion caused by receiver phase noise (PN) on OFDM waveforms in direct-conversion radio receivers. A closed-form solution for the observed signal-to-interference-plus-noise ratio (SINR) is derived, describing the level of intercarrier interference (ICI) stemming from PN. Compared to existing literature, the analysis is(More)