OFDM receiver using polar coordinate system and method thereof

Details OFDM receiver using polar coordinate system and method thereof OFDM receiver using polar coordinate system and method thereof

2007-01-02

2007-01-02

Pham, Brenda (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S210000

Reexamination Certificate

active

10206864

ABSTRACT:
A received signal is converted into a digital signal through an A/D converter and then converted into the polar coordinate system. A synchronizer removes a frequency offset from the digital signal, the digital signal is again converted into an orthogonal coordinate system and a fast fourier transform is performed with a FFT. The digital signal is again converted into the polar coordinate system. An equalizer and a phase compensator compensate respectively a channel distortion and a phase error to the digital signal. Thus, the OFDM receiver using polar coordinate system and method thereof of the present invention can reduce the number of adders and multipliers required in a frequency synchronization, a compensation for channel influence, and a removal of remaining phase error by processing the signal in the polar coordinate system, thereby simplifying the calculation process and the receiver.

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Van de Beek J.J. et al, “Three Non-pilot Based Time-and Frequency Estimators for OFDM”, Signal Processing, Amsterdam, NL, vol. 80, No. 7, Jul. 2000, pp. 1321-1334.
Schmidl T. M. et al. “Blind Synchronisation 1-23 for OFDM”, Electronics Letters, IEE Stevenage, GB vol. 33, No. 2, Jan. 16, 1997, pp. 113-114.

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