Differential space-time modulation is an attractive alternative for mobile communications systems with multiple antennas at transmitter and/or receiver since it does not require channel estimation. Most proposals which are available in literature are based on unitary matrices which limits the achievable data rate and performance. We propose a generalized transmitter and soft-output detector for non-coherent space-time modulation which is not restricted to unitary matrices. At the transmitter, a normalization factor guarantees that the differential scheme meets a power constraint. However, this normalization factorwhich depends on the transmitted data-makes it hard to design a soft-output detector. Our main contribution is a new soft-output detector which does not require knowledge of channel coefficients, channel statistics or noise variance.
In the smart grid, the G3-PLC solution is in direct competition with other IP-based communications technologies such as GPRS or DSL. In this paper, we present the devolo's 500 kHz G3-PLC access technology and it's analysis based on smart grid field trials in Germany. The focus of the analysis in this paper is concentrated on the following parameters: The influencing factor of near and far transmission throughput, the influence of a repeater on the throughput, and the influence of different UDP packet size on the throughput.
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