Marc C. Necker

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A new blind channel estimation scheme for OFDMsystems is proposed based on the ML-principle. By avoiding the use of secondand higher-order statistics, a very fast convergence rate is achieved. A novel approach is also proposed for resolving the phase ambiguity of the blind channel estimate without the need for any reference symbols. The approach combines(More)
Orthogonal frequency division multiple access is the basis for several emerging mobile communication systems. Prominent examples are the 3GPP long term evolution as the successor of UMTS high-speed packet access and the IEEE 802.16 system, advanced by the WiMax forum. On a system level, OFDMA is basically a combination of time and frequency division(More)
Abstract Wireless systems based on Orthogonal Frequency Division Multiple Access (OFDMA) multiplex different users in time and frequency. One of the main problems in OFDMA-systems is the inter-cell interference. A promising approach to solve this problem is interference coordination (IFCO). In this paper, we present a novel distributed IFCO scheme, where a(More)
Wireless systems based on Orthogonal Frequency Division Multiple Access (OFDMA) multiplex different users in time and frequency. One of the main problems in OFDMAsystems is the inter-cell interference. A promising approach to solve this problem is interference coordination (IFCO). In this paper, we present a novel distributed IFCO scheme, where a central(More)
This work deals with the service time of IP-packets within the UMTS Terrestrial Radio Access Network (UTRAN). The focus is on the influence of the Radio Link Control (RLC) Layer’s ARQ-mechanism with respect to the various parametrization possibilities. The service time of IP packets is evaluated by means of pdf and ccdf functions. Beside the discussion of(More)
In recent years, Orthogonal Frequency Division Multiple Access (OFDMA) has become an attractive transmission technology, which is part of various emerging system standards for broadband cellular communications. Examples include the 3GPP Long Term Evolution (LTE) and 802.16e WiMAX. In OFDMA, mobile terminals are multiplexed in time and frequency. A major(More)
With the emergence of high-speed wireless cellular networks, such as High Speed Downlink Packet Access (HSDPA) or WiMAX, new services with a high bandwidth demand have been introduced. One example is non-interactive video streaming. In contrast to wireline networks, the characteristics of wireless links, such as a time-varying bandwidth and the trade-off(More)