Marko Kosunen

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Spectrum sensing is needed in cognitive radios to provide information about the surrounding radio spectrum. This enables cognitive radio system to communicate among existing radio systems without interfering them. This paper describes an FPGA implementation of a cyclostationary feature detector, which has an improved detection performance achieved by(More)
In this paper, a micropower interface IC for a capacitive 3-axis micro-accelerometer is presented. The IC is implemented in a 0.25m CMOS process. The fully-integrated sensor interface is based on a sensor front-end that operates mechanically in an open-loop configuration and converts the acceleration signals directly into the digital domain, thus avoiding(More)
Spectrum sensing is an essential part of future cognitive radios, as the spectrum sensor provides information about the utilization of the surrounding radio spectrum. Several approaches to implementing spectrum sensing have been proposed in the literature, one of them being the class of feature detectors. Cyclostationary feature detectors are, in general,(More)
Detecting the presence of primary users and ability to find white spaces in the spectrum are the key enablers of the opportunistic communication. This paper analyzes the trade-offs in cyclostationary-based spectrum sensing algorithm implementations in terms of performance, hardware complexity, and power consumption. The evaluation of the algorithm(More)
In a 3-axis compass, the system tilt of the sensors needs to be compensated to calculate the heading of the compass correctly. A novel tilt compensation algorithm using the CORDIC algorithm is presented. Only five 2D-CORDIC operations are needed to ac quire the heading angle from three components of magnetic and acceleration data. This can be useful in ASIC(More)
Localized spectrum sensing is an alternate for database centric approaches to solve secondary use of spectrum in cognitive radios. This can be carried out by using collaborative spectrum sensing where larger amount of small devices is utilized for local spectrum sensing. This paper describes an mobile device scale implementation of multi-mode, multi-band(More)
In this paper, design and implementation of a multicarrier quadrature amplitude modulation (QAM) modulator for a wideband code division multiple access (WCDMA) base-station with a 14-bit on-chip D/A converter is described. The modulator is capable of modulating four carriers with four independent in phase (I) and quadrature (Q) data streams. The proposed(More)
Spectrum sensing is one of the most challenging task in implementing future cognitive radios. The sensing unit should provide reliable information about the surrounding radio spectrum with small delay and low power consumption. This paper presents an implementation of a spectrum sensing unit capable of performing both cyclostationary feature detection and(More)