K. Vaisanen

Publications (2)0 Total impact

• Conference Proceeding: All-digital symbol timing recovery scheme utilizing efficient IIR prefiltering

  K. Vaisanen, M. Renfors
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  ABSTRACT: Efficient IIR filter structures based on allpass subfilters have been presented earlier for Nyquist pulse shaping applications. In a previous paper, we presented a receiver front-end architecture which efficiently combines the half-Nyquist filtering and special prefiltering required to achieve jitter-free frequency-error detection. In this paper we utilize the same kind of prefiltering to develop an all-digital jitter-free symbol timing error tracker suitable for multiamplitude signals. The proposed structure is an approximation to a timing error tracker based on the maximum likelihood principle. It is also shown that fast convergence of the timing recovery loop can be achieved due to the short filter delay in the feedback loop
  Personal, Indoor and Mobile Radio Communications, 1997. 'Waves of the Year 2000'. PIMRC '97., The 8th IEEE International Symposium on; 10/1997
• Conference Proceeding: Efficient IIR filters for pulse-shaping and jitter free frequency error detection and timing recovery

  M. Renfors, K. Vaisanen
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  ABSTRACT: Efficient IIR filter structures based on allpass subfilters have been presented earlier for Nyquist pulse shaping applications. We examine the properties of these filters and discuss how the special properties of this filter class can be utilized more generally in the front-end processing of digital receivers. We present an efficient receiver front-end architecture which combines with the receiver half-Nyquist filtering the special prefiltering required to achieve jitter-free performance in certain frequency-error detection and timing recovery schemes. It is shown that this filter class gives at least as good performance as standard raised-cosine filtering
  Global Telecommunications Conference, 1995. GLOBECOM '95., IEEE; 12/1995