Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Patent
1995-03-30
1998-09-22
Hsu, Alpus H.
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
370210, 370516, 375260, 375344, 375362, 375210, H04J 1100
Patent
active
058125230
ABSTRACT:
A method of demultiplexing OFDM signals and a receiver for such signals. More particularly the method is concerned with synchronization in an OFDM receiver. A signal is read into a synchronization unit, in the time domain, i.e., before fourier transforming the signal by means of an FFT processor. In the synchronization unit, a frame clock is derived for triggering the start of the FFT process and for controlling the rate at which data is supplied to the FFT processor. For OFDM reception, it is vital that the FFT process commences at the right point in time. Once the frame clock has been recovered, a frequency error can be estimated by the synchronization unit. The frequency error is used to control; an oscillator which generates a complex rotating vector which is, in turn, multiplied with the signal to compensate for frequency errors. The method can be used both with OFDM systems in which symbols are separated by guard spaces, and with OFDM systems in which symbols are pulse shaped.
REFERENCES:
patent: 4245325 (1981-01-01), Kikuchi et al.
patent: 5313169 (1994-05-01), Fouche et al.
patent: 5345440 (1994-09-01), Gledhill et al.
patent: 5371548 (1994-12-01), Williams
patent: 5444697 (1995-08-01), Leung et al.
patent: 5450456 (1995-09-01), Mueller
Engstroem Bo
Isaksson Mikael
Hsu Alpus H.
Telia AB
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