Performance Comparison of Hierarchical Modulation Receiver Concepts for Different Service Classes
Mathias Dehm, Sebastian Helmle, Fabian Hohmann, Michael Kuhn, Christian Körner, and Dirk Pesch
A narrowband transmission chain using conventional quadrature amplitude modulation (QAM) and soft-decoding is extended for hierarchical modulation. Different receiver concepts and modulation schemes are investigated by means of packet error rate (PER) in a multipath channel model. Two different data service classes are considered, a high priority (HP) voice stream requiring a certain PER and a low priority (LP) stream with retransmissions striving for maximum throughput. Furthermore, the paper describes how hierarchical modulationis adjusted adaptively according to the channel conditions to increase the performance, i.e. the amount of successfully received data, in contrast to a 4- and 16-QAM. The novel results show that hierarchical modulation achieves superior performance especially in the lower Es/N0 regions.
IEEE International Symposium on Wireless Communication Systems, ISWCS 2013, Ilmenau, Germany, August 2013
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