Stefan Ataman

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Traditional Forward Error Correction (FEC) rate allocation schemes, used to enhance the robustness of JPEG 2000 images and video against transmission errors, are based either on Packet oriented Unequal Error Protection or on Layer oriented Unequal Error Protection. As both approaches hold their advantages, unifying them under a new framework becomes a(More)
We propose to combine the gains of a downlink power control and a joint multicode detection, for an HSDPA link. We propose an iterative algorithm that controls both the transmitted code powers and the joint multicode receiver filter coefficients for the high-speed multicode user. At each iteration, the receiver filter coefficients of the multicode user are(More)
This paper reports an implementation of the PHY specifications of the IEEE 802.15.4 standard for the frequency band 868/915 MHz on a Software Defined Radio (SDR) platform. This standard is defined for low power, low data rate and low cost wireless networks. These specifications are used by the Zigbee technology for various applications such as home(More)
In this paper, we report a series of RF (Radio Frequency) measurements performed on a USRP and a GNU Radio Software Defined Radio (SDR). The RFX 900 and RFX 2400 Daughter Boards are connected to an USRP N210 platform and driven by the GNU Radio open source software. We focused on two main aspects: the output RF bandwidth and the power linearity versus the(More)
In this paper we report Radio Frequency (RF) measurements performed on a GNU Radio/Universal Software Radio Peripheral (USRP) testbed. The USRP hardware is connected to SBX daughter board, both designed by Ettus Research. We can confirm the bandwidth stated by the designer, nonetheless the output power was found to be constantly decreasing with increasing(More)