Elmar Trojer

Upstream FEC performance in combination with burst mode receivers for next generation 10 Gbit/s PON

FEC gain in DC-coupled burst mode receivers is limited because of a variance in BER between bursts. This BER variance is characterized in an XG-PON1 upstream prototype. It is shown that basic BER tests overestimate the FEC gain.

Quality multimedia distribution through resource management and performance monitoring over DSL networks

This paper describes a Copper Plant Manager concept for DSL first mile, which effectively enables performance monitoring, fault interpretation and dynamic link management. This concept copes with the nature and complexity of the underlying DSL network and presents a unified solution for controlling and managing its resources. An implementation of the CPM concept embedded in a Network Management System is described, together with the method proposed for using it to allocate DSL resources to satisfy the requirements of resource- demanding multimedia services such as IPTV.

An LPC-Based Fronthaul Compression Scheme

Several new architectures are under investigation for cloud radio access networks, assuming distinct splits of functionality among the network elements. Consequently, the research on radio data compression for the fronthaul is based on assumptions that correspond to a wide variety of tradeoffs among data rate, signal distortion, latency, and computational cost. This letter describes a method for LTE downlink point-to-point signal compression based on linear prediction and Huffman coding, which is suitable for low cost encoding and decoding units with stringent restrictions on power consumption. The proposed method can work at various compression factors, such as 3.3:1 at an average EVM of 0.9%, or 4:1 at an average EVM of 2.1%.

Mapping the impulse noise spectral features from waveform domain onto symbol domain

In this paper the spectral features of impulse noise in DSL systems are mapped from the waveform domain onto the symbol domain, considering a QAM receiver. This work can be viewed as part of a full symbol domain model for impulse noise, which should include the amplitude and spectral aspects. Since the available models of impulse noise in DSL are generally waveform-based, this kind of mapping is justified when symbol-based simulations are intended, in order to avoid computational overhead due to demodulating noise samples generated on waveform domain. The analytical development of such mapping is provided as well as some simulation results.