Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1997-06-30
1999-10-19
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455257, H04B 100
Patent
active
059703970
ABSTRACT:
Various methods for terrestrial transmission of digital broadcast signals as DVB, HDTV-T and DAB signals are known. One of these methods is the OFDM method, where the transmitted signal includes a multiplicity of modulated carriers. These carriers are separated in the receiver by means of a Fast Fourier Transformation (FFT). Before being transposed in the frequency domain by the FFT, the analog signal must be sampled. For this purpose a local oscillator controls the timing in front of the FFT. Oscillator imperfections like jitter and frequency offsets can degrade the accuracy of the sampling operation and therefore introduce intercarrier interferences after the FFT. A feedback loop combining the AFC and CPEE process has been designed in order to correct frequency deviations and to reduce jitter of the signal without introducing significant phase noise.
REFERENCES:
patent: 5159292 (1992-10-01), Canfield et al.
patent: 5602835 (1997-02-01), Seki et al.
Copy of the European Search Report 3 pages.
Nilsson et al., "An Analysis of Two-dimensional Pilot Symbol Assisted Modulation for OFDM" IEEE International Conference on Personal Wireless Communications, Apr. 1997.
Robertson et al., "Analysis of Effects of Phase Noise in OFDM Systems" IEEE Conference on Communications, Feb. 1995.
Tufvesson et al., "Pilot Assisted Channel Estimation for OFM in Mobile Cellular Systems" IEEE 47th Vehicular Technology Conference, Mar. 1997.
Klank Otto
Madeleine Dominique
Aoki Makoto
Deutsche Thomson-Brandt GmbH
Eisenzopf Reinhard J.
Herrmann Eric P.
Kurdyla Ronald H.
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