MIMO receiving apparatus and method
AssigneeNEC Corporation
InventorsKunifusa Maruyama, Masayuki Kimata
Life of this patent
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Abstract
A coherent bandwidth calculation unit (41) calculates a coherent bandwidth based on a channel response in the time domain obtained from reception signals (R1-RN) for each path between transmitting antennas and receiving antennas. A weight calculation control unit (42) determines target subcarriers of equalization weight calculation based on the coherent bandwidth. A weight calculation unit (31) calculates the equalization weight of each target subcarrier. A weight interpolation unit (43) performs interpolation processing using the equalization weights so as to obtain equalization weights for the subcarriers that have not undergone equalization weight calculation yet.
Claims12
A MIMO receiving apparatus having a MIMO (Multiple Input Multiple Output) function of receiving, by a plurality of receiving antennas, transmission signals transmitted from a plurality of transmitting antennas, and outputting the transmission signals demultiplexed from reception signals based on equalization weights of arbitrary subcarriers generated from the reception signals, comprising:
- a coherent bandwidth calculation unit that calculates a coherent bandwidth based on a channel response in a time domain obtained from the reception signals for each path between the transmitting antennas and the receiving antennas;
- a weight calculation control unit that determines target subcarriers of equalization weight calculation based on the coherent bandwidth;
- a weight calculation unit that calculates the equalization weight of each target subcarrier based on a channel estimation value in a frequency domain obtained from the reception signals for each path between the transmitting antennas and the receiving antennas;
- a weight interpolation unit that interpolates the equalization weights so as to calculate equalization weights for the subcarriers that have not undergone equalization weight calculation yet;
- a power variation detection unit that detects a power variation of each subcarrier,
- wherein said power variation detection unit determines a detection threshold from an average reception power in the frequency domain at a coherent bandwidth interval, compares the detection threshold with a reception power of each subcarrier within the coherent bandwidth, and detects, as a detected subcarrier, a subcarrier whose reception power is not more than the detection threshold or not less than the detection threshold.
A MIMO receiving method using a MIMO (Multiple Input Multiple Output) function of receiving, by a plurality of receiving antennas, transmission signals transmitted from a plurality of transmitting antennas, and outputting the transmission signals demultiplexed from reception signals based on equalization weights of arbitrary subcarriers generated from the reception signals, comprising the steps of:
- calculating a coherent bandwidth based on a channel response in a time domain obtained from the reception signals for each path between the transmitting antennas and the receiving antennas;
- determining target subcarriers of equalization weight calculation based on the coherent bandwidth;
- calculating the equalization weight of each target subcarrier based on a channel estimation value in a frequency domain obtained from the reception signals for each path between the transmitting antennas and the receiving antennas;
- interpolating the equalization weights so as to calculate equalization weights for the subcarriers that have not undergone equalization weight calculation yet;
- detecting a power variation of each subcarrier,
- wherein the step of detecting the power variation comprises the step of determining a detection threshold from an average reception power in the frequency domain at a coherent bandwidth interval, comparing the detection threshold with a reception power of each subcarrier within the coherent bandwidth, and detecting, as a detected subcarrier, a subcarrier whose reception power is not more than the detection threshold or not less than the detection threshold.
Dependencies are inferred from the claim text.