Open Access

Comparison of OQPSK and CPM for Communications at 60 GHz with a Nonideal Front End

  • Jimmy Nsenga1, 2Email author,
  • Wim Van Thillo1, 2,
  • François Horlin1,
  • André Bourdoux1 and
  • Rudy Lauwereins1, 2
EURASIP Journal on Wireless Communications and Networking20072007:086206

Received: 4 May 2006

Accepted: 3 January 2007

Published: 15 March 2007


Short-range digital communications at 60 GHz have recently received a lot of interest because of the huge bandwidth available at those frequencies. The capacity offered to the users could finally reach 2 Gbps, enabling the deployment of new multimedia applications. However, the design of analog components is critical, leading to a possible high nonideality of the front end (FE). The goal of this paper is to compare the suitability of two different air interfaces characterized by a low peak-to-average power ratio (PAPR) to support communications at 60 GHz. On one hand, we study the offset-QPSK (OQPSK) modulation combined with a channel frequency-domain equalization (FDE). On the other hand, we study the class of continuous phase modulations (CPM) combined with a channel time-domain equalizer (TDE). We evaluate their performance in terms of bit error rate (BER) considering a typical indoor propagation environment at 60 GHz. For both air interfaces, we analyze the degradation caused by the phase noise (PN) coming from the local oscillators; and by the clipping and quantization errors caused by the analog-to-digital converter (ADC); and finally by the nonlinearity in the PA.


Authors’ Affiliations

Departement Elektrotechniek - ESAT, Katholieke Universiteit Leuven


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© Jimmy Nsenga et al. 2007

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.