Equalizer, receiving apparatus and receiving method
AssigneeNEC Corporation
InventorRyuji Zenkyu
Life of this patent
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Abstract
An equalizer can connect with N receiving antennas that receive single carrier transmission signals transmitted from M transmitting antenna(s) in the same frequency band at the same time, and receives as input L signals sampled in a sampling period T from each of the N receiving antennas, the equalizer comprising, a first selection part that selects K signal(s) from the L signals for each of the N receiving antennas as signals to be multiplied by a first tap coefficient(s), and a second selection part selects L-K signal(s) to be multiplied by a second tap coefficient(s), from the L signals obtained by multiplying signals in the same sampling period for each of the N receiving antennas by the tap coefficient(s) and performing addition thereof.
Claims11
An equalizer that is connected with N receiving antennas, where N is an integer greater than or equal to 2, that receive single carrier transmission signals transmitted from M transmitting antennas, where M is an integer greater than or equal to 2, in the same frequency band at the same time, and that receive as input L signals, where L is an integer greater than 1, sampled according to a sampling period T from each of the N receiving antennas, the equalizer comprising:
- a first selection part that selects at least one of K signals, where K is an integer greater than or equal to 1 and smaller than L, from the L signals, as signals to be multiplied by a first tap coefficients, for each of the N receiving antennas;
- and
- a second selection part that selects at least one of L-K signals to be multiplied by a second tap coefficients, from the L signals obtained by multiplying signals in the same sampling period for each of the N receiving antennas, by the second tap coefficients and performing addition thereof;
- a control signal generation part that generates a control signal to be supplied to each of the first and the second selection parts;
- wherein
- the first selection part selects the least one of K signals to be multiplied by the first tap coefficients in response to the control signal, and
- the second selection part selects the at least one of L-K signals to be multiplied by the second tap coefficients in response to the control signal;
- wherein
- the control signal generation part generates a first control signal of L bits and supplies the first control signal to the first selection part, and
- generates a second control signal obtained by bit-inverting the first control signal of L bits and supplies the second control signal to the second selection part.
A receiving method in an equalizer that can connect with N receiving antennas N is an integer greater than or equal to 2 that receive single carrier transmission signals transmitted from M transmitting antennas, M is an integer greater than or equal to 2 in the same frequency band at the same time, and that receive as input L signal(s), L is an integer greater than 1, sampled according to a sampling period T from each of the N receiving antennas, the method comprising:
- selecting at least one of K signals, K is an integer greater than or equal to 1 and smaller than L, from among the L signals, as signals to be multiplied by a first tap coefficients, for each of the N receiving antennas;
- and
- selecting at least one of L-K signals to be multiplied by a second tap coefficients, from among the L signals obtained by multiplying signals in the same sampling period for each of the N receiving antennas, by the second tap coefficients and performing addition thereof;
- wherein
- the at least one of K signals to be multiplied by the first tap coefficients is selected based on receiving a first control signal of L bits;
- and
- the at least one of L-K signals to be multiplied by the second tap coefficients are selected based on receiving a second control signal obtained by bit-inverting the first control signal of L bits.
A receiving apparatus for Single Carrier-Multiple Input and Multiple Output (SC-MIMO) transmission configured to receive a single carrier transmission signals transmitted by M transmitting antennas, M is an integer greater than or equal to 2, by N receiving antennas, N is an integer greater than or equal to 2, in the same frequency band and time, the receiving apparatus comprising:
- an input switching apparatus A configured to:
- receive a signal sampled in a sampling period T as input from the N receiving antennas;
- and generate a signal by multiplying the N signals by a tap coefficients and perform addition thereof;
- and
- further select at least one of L K signals, K is an integer greater than or equal to 1, from these L signals, L is an integer greater than 1, by an L bits control signal generated by a switching signal generation apparatus;
- an input switching apparatus B configured to select at least one of K signals from the L signals, by the L bits control signal, with the N signals received as input by the respective N antennas;
- and
- an adaptive equalizer in a time domain configured to estimate a transmission signal by multiplying signals selected by the input switching apparatus A and the input switching apparatus B by the tap coefficients, and perform addition thereof;
- wherein:
- the L bits control signal generated by the switching signal generation apparatus is transmitted to the input switching apparatuses A and B;
- in the input switching apparatus A, with 1 or 0 in the L bits control signal regarded as input to the tap coefficients, and 0 or 1 regarded as non-input to the tap coefficients, the at least one of L-K signals are selected as input to the tap coefficients from L signals inputted to the input switching apparatus A;
- and
- in the input switching apparatus B, with 0 or 1 in the L bits control signal as input to the tap coefficients, and 1 or 0 as non-input to the tap coefficients, the at least one of K signals are selected as input to the tap coefficients from the L signals to be inputted to the input switching apparatus B.
Dependencies are inferred from the claim text.