Method and apparatus for estimating channel state information
AssigneeSamsung Electronics Co., Ltd.
InventorsHyun Bae Jeon, Sergey Zhidkov
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Abstract
An orthogonal frequency division multiplexing (OFDM) receiver includes a n average power calculation unit and an output unit. The average power calculation unit calculates and outputs a first average power of a null symbol section of each transmitted frame output from an OFDM transmitter and calculates and outputs second average powers of sub-carriers that correspond to each null symbol section. The output unit compares the first average power and the second average powers, to perform a reciprocal transformation on difference values of the first average power and each of the second average powers based on results of the comparisons, and to store and output reciprocally transformed values as channel state information.
Claims20
An orthogonal frequency division multiplexing (OFDM) receiver comprising:
- an average power calculation unit to calculate and output a first average power of a null symbol section of each transmitted frame output from an OFDM transmitter and to calculate and output second average powers of sub-carriers that correspond to each null symbol section;
- and
- an output unit to compare the first average power and the second average powers, to perform a reciprocal transformation on difference values of the first average power and each of the second average powers based on results of the comparisons, and to store and output reciprocally transformed values as channel state information.
An orthogonal frequency division multiplexing (OFDM) receiver comprising:
- a decoding unit to differentially decode corresponding symbols in a symbol section of transmitted frames output from an OFDM transmitter to generate differentially decoded symbols and to deinterleave each of the differentially decoded symbols;
- a channel state information estimation unit to compare a reference value with average powers of a null symbol section of each of the transmitted frames and to output a result of the comparison as channel state information;
- and
- a multiplier to multiply an output value of the decoding unit by a corresponding output value of the channel state information estimation unit.
A noise reduction unit comprising:
- an average power calculation unit to receive a plurality of orthogonal frequency division multiplexing (OFDM) frames and to calculate a first average power of null symbol sections of the frames and a second average power of subcarriers of the null symbol sections;
- a de-interleaver to de-interleave the second average power to generate a de-interleaved signal;
- an amplifier to amplifier the first average power to generate an amplified power signal;
- a reference signal;
- a noise estimation unit to generate noise information based on the de-interleaved signal and the amplified power signal;
- and
- a reduction unit to reduce noise in the OFDM frames using the noise information.
A noise estimation unit comprising:
- a de-interleaver to de-interleave a first signal that includes an average power of subcarriers of null symbol sections of a plurality of orthogonal frequency division multiplexing (OFDM) frames;
- an amplifier to amplify a second signal that includes an average power of null symbol sections of the frames to generate an amplified power signal;
- a recipocal transformer to perform one of a reciprocal transformation on a difference between the de-interleaved signal and the amplified power signal and a reciprocal transformation of a reference signal to generate a noise estimation.
Dependencies are inferred from the claim text.