Transmitter and receiver for frequency domain equalization
AssigneesSamsung Electronics Co., Ltd., Postech Academy-Industry Foundation
InventorsDong Sik Kim, Ui Kun Kwon, Gi Hong Im, Chang Yong Shin
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Abstract
A transmitter and/or receiver for performing frequency domain equalization is provided. A transmitter includes a pilot position determination unit for determining positions for inserting pilots in a frequency domain based on frequency spectrums of data, and a pilot insertion unit for inserting the pilots between the frequency spectrums of the data according to the determined positions for inserting the pilots.
Claims7
A receiver for performing frequency domain equalization, the receiver comprising:
- a signal receiving unit which receives a signal transmitted from a transmitter via a channel;
- a first discrete Fourier transformer (DFT) which transforms the received signal into a first frequency domain signal, the first frequency domain signal including frequency spectrums of data and pilots;
- a channel estimator which ascertains positions of the pilots with respect to positions of the frequency spectrums of the data using a channel frequency response being calculated based on the pilots, and estimates a frequency response of the channel based on the ascertained positions of the pilots;
- and
- a frequency domain equalizer which performs equalization with respect to the first frequency domain signal based on the estimated frequency response of the channel, wherein
- the channel estimator analyzes, in a time domain, a channel frequency response being calculated based on the data and the channel frequency response being calculated based on the pilots to ascertain the positions of the pilots.
A receiver for performing frequency domain equalization, the receiver comprising:
- a signal receiving unit which receives a signal transmitted from a transmitter via a channel;
- a first discrete Fourier transformer (DFT) which transforms the received signal into a first frequency domain signal, the first frequency domain signal including frequency spectrums of data and pilots, and the frequency spectrums of the data and the pilots being cyclic-shifted so that at least one target pilot of the pilots exists in a predetermined position;
- a frequency domain equalizer which estimates the channel based on the pilots and equalizes the first frequency domain signal based on the estimated channel;
- a first inverse discrete Fourier transformer (IDFT) which transforms an output of the frequency domain equalizer into a time domain signal;
- a cyclic shift determination unit which determines how much the frequency spectrums of the data and the pilots are cyclic-shifted, based on an output of the first IDFT;
- a phase adjusting unit which adjusts a phase of the output of the first IDFT based on the determination result;
- and
- a decision unit which makes a decision with respect to the data using an output of the phase adjusting unit.
Dependencies are inferred from the claim text.