Method and apparatus for reducing peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signal and transmitter
AssigneeSamsung Electronics Co., Ltd.
InventorsByung Moo Lee, Byung Chang Kang, Jong Ho Bang, Nam Jeong Lee, Jin Hyeock Choi
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Abstract
Methods and apparatus for reducing a peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal in an MIMO-OFDM communication system is provided, in which the method for reducing the PAPR of the OFDM signal may identify interference generated in an MIMO communication system, and adjust a clipping ratio (CR) for an effect of a clipping distortion to be less than an effect of interference.
Claims18
A method for reducing a peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal in a multiple-input multiple-output (MIMO) communication system, the method comprising:
- estimating an interference level in a communication channel between a transmitter and a user terminal;
- determining a clipping ratio (CR), based on the estimated interference level;
- clipping the OFDM signal based on the determined CR;
- and
- filtering the clipped OFDM signal,
- wherein the estimating of the interference level comprises:
- estimating a cross correlation level of the communication channel in response to the MIMO communication system performing a matched filter (MF) precoding;
- determining the interference level based on the estimated cross correlation level,
- wherein the interference level comprises an inter-user interference (IUI) level.
A multiple-input multiple-output (MIMO) apparatus comprising:
- an interference level estimator configured to estimate an interference level in a communication channel between a transmitter and a user terminal;
- a clipping ratio (CR) determiner configured to determine a CR to be applied to an orthogonal frequency division multiplexing (OFDM) signal, based on the interference level;
- and
- a clipper and a filter configured to clip the OFDM signal based on the CR and filter the clipped OFDM signal,
- wherein the transmitter is configured to transmit the clipped and filtered OFDM signal to the user terminal, and
- wherein the interference level estimator estimates the interference level by
- estimating a cross correlation level of the communication channel in response to the MIMO communication system performing a matched filter (MF) precoding;
- and
- determining the interference level based on the estimated cross correlation level,
- wherein the interference level comprises an inter-user interference (IUI) level.
An apparatus for reducing a peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal, the apparatus comprising:
- a channel estimator configured to estimate a communication channel between a transmitter and a user terminal in a multiple-input multiple-output (MIMO) communication system;
- an interference level estimator configured to estimate an interference level in the MIMO communication channel;
- and
- a clipping ratio (CR) determiner configured to determine a CR, based on the interference level, and to provide the determined CR to the transmitter,
- wherein the transmitter is configured to transmit the clipped and filtered OFDM signal to the user terminal, and
- wherein the interference level estimator estimates the interference level by
- estimating a cross correlation level of the MIMO communication channel in response to the MIMO communication system performing a matched filter (MF) precoding;
- and
- determining the interference level based on the estimated cross correlation level,
- wherein the interference level comprises an inter-user interference (IUI) level.
Dependencies are inferred from the claim text.