Method of calibrating power for MIMO-OFDM transmitter
First Claim
1. A method of calibrating power for a multiple input and multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) transmitter having a plurality of antennas via a measurement equipment coupled to the MIMO-OFDM transmitter, the method comprising:
- receiving, via the measurement equipment, a cyclic delay diversity (CDD) signal which is cyclically delayed for a predetermined time period and simultaneously output from the MIMO-OFDM transmitter to obtain a starting point of a frame of a corresponding signal;
performing, via the measurement equipment, a fast Fourier transform (FFT) on a sample preceded by a maximum CDD delay from the starting point of the frame;
calculating, via the measurement equipment, a channel coefficient H(n) by using an FFT calculated training symbol Y(n) and an ideal training symbol X(n), wherein n=0, 1, 2, . . . ;
calculating, via the measurement equipment, a channel impulse response h(k) by performing an inverse fast Fourier transform (IFFT) on the channel coefficient H(n) and calculating a power p(k) of the channel impulse response, wherein k=0, 1, 2, . . . ;
converting, via the measurement equipment, CDD delay values of each antenna into CDD delay sample values by using a sampling rate in the channel impulse response;
mapping, via the measurement equipment, a peak point position of the channel impulse response to each antenna by using the CDD delay sample values; and
simultaneously performing, via the measurement equipment, a power calibration of each antenna based on each peak point power of the plurality of antennas.
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Abstract
Provided is a method of calibrating a power for a multiple input and multiple output-orthogonal frequency division multiplexing transmitter having a plurality of antennas via a measurement equipment, the method including: receiving a cyclic delay diversity (CDD) signal simultaneously output from the transmitter to obtain a starting point of a frame of a corresponding signal; performing a fast Fourier transform on a sample proceeded from the starting point by an extent of a maximum CDD delay; calculating a channel coefficient; calculating a channel impulse response and a power of the channel impulse response; converting CDD delay values of each antenna into values in units of samples by using a sampling rate in the channel impulse response; mapping a peak point position of the channel impulse response to each antenna using CDD delay sample values; and simultaneously performing a power calibration of each antenna based on each peak point power.
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Citations
4 Claims
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1. A method of calibrating power for a multiple input and multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) transmitter having a plurality of antennas via a measurement equipment coupled to the MIMO-OFDM transmitter, the method comprising:
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receiving, via the measurement equipment, a cyclic delay diversity (CDD) signal which is cyclically delayed for a predetermined time period and simultaneously output from the MIMO-OFDM transmitter to obtain a starting point of a frame of a corresponding signal; performing, via the measurement equipment, a fast Fourier transform (FFT) on a sample preceded by a maximum CDD delay from the starting point of the frame; calculating, via the measurement equipment, a channel coefficient H(n) by using an FFT calculated training symbol Y(n) and an ideal training symbol X(n), wherein n=0, 1, 2, . . . ; calculating, via the measurement equipment, a channel impulse response h(k) by performing an inverse fast Fourier transform (IFFT) on the channel coefficient H(n) and calculating a power p(k) of the channel impulse response, wherein k=0, 1, 2, . . . ; converting, via the measurement equipment, CDD delay values of each antenna into CDD delay sample values by using a sampling rate in the channel impulse response; mapping, via the measurement equipment, a peak point position of the channel impulse response to each antenna by using the CDD delay sample values; and simultaneously performing, via the measurement equipment, a power calibration of each antenna based on each peak point power of the plurality of antennas. - View Dependent Claims (2, 3, 4)
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Specification