Control apparatus for and control method of equalizer, and wireless terminal having that control apparatus
AssigneeFujitsu Limited
InventorsAkira Ito, Tsuyoshi Hasegawa
Life of this patent
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Abstract
A channel estimation value of each path timing is determined, a path timing, the channel estimation value of which is to be set to zero, is determined based on a reception power of each path timing and a predetermined power threshold (P0), and a channel estimation value of the detected path timing to zero.
Claims12
A control apparatus for an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control apparatus comprising:
- a channel estimation unit that determines respective channel estimation values of the each path timing;
- and
- a channel estimation value control unit that detects a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold and sets a channel estimation value of the detected path timing to zero, wherein
- the channel estimation value control unit identifies a path timing other than the path timing having a power greater than the power threshold and the path timing within a predetermined timing threshold including the path timing having the power greater than the power threshold as a path timing, the channel estimation value of which is to be set to zero.
A control apparatus for an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control apparatus comprising:
- a channel estimation unit that determines respective channel estimation values of the each path timing;
- a channel estimation value control unit that detects a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold and sets a channel estimation value of the detected path timing to zero;
- and
- a correlation calculation unit that determines the correlation value based on a product of the channel estimation values before control by the channel estimation value control unit and a noise estimation value.
A control apparatus for an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control apparatus comprising:
- a channel estimation unit that determines respective channel estimation values of the each path timing;
- a channel estimation value control unit that detects a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold and sets a channel estimation value of the detected path timing to zero;
- and
- a correlation calculation unit that determines the correlation value based on a product of the channel estimation values after control by the channel estimation value control unit and a noise estimation value.
A control apparatus for an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control apparatus comprising:
- a channel estimation unit that determines respective channel estimation values of the each path timing;
- and
- a channel estimation value control unit that detects a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold and sets a channel estimation value of the detected path timing to zero;
- and, wherein the channel estimation value control unit comprises a determination unit that determines whether or not a reception status of the received sequence indicates a non-multipath status based on a reception power of the each path timing, and wherein
- the channel estimation value control unit controls to increase the power threshold when it is determined that a non-multipath status is indicated by the determination unit, or to reduce the power threshold when it is determined that a multipath status is indicated by the determination unit.
A wireless terminal comprising:
- a control apparatus for an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control apparatus comprising:
- a channel estimation unit that determines respective channel estimation values of the each path timing;
- and
- a channel estimation value control unit that detects a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold and sets a channel estimation value of the detected path timing to zero, wherein
- the channel estimation value control unit identifies a path timing other than the path timing having a power greater than the power threshold and the path timing within a predetermined timing threshold including the path timing having the power greater than the power threshold as a path timing, the channel estimation value of which is to be set to zero.
A control method of an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control method comprising:
- determining respective channel estimation values of the each path timing;
- detecting a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold;
- identifying a path timing other than the path timing having a power greater than the power threshold and the path timing within a predetermined timing threshold including the path timing having the power greater than the power threshold as a path timing, a channel estimation value of which is to be set to zero;
- and
- setting the channel estimation value of the detected path timing to zero.
A control method of an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control method comprising:
- determining respective channel estimation values of the each path timing;
- detecting a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold;
- setting a channel estimation value of the detected path timing to zero;
- and
- determining the correlation value based on a product of the channel estimation values before the control and a noise estimation value.
A control method of an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control method comprising:
- determining respective channel estimation values of the each path timing;
- detecting a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold;
- setting a channel estimation value of the detected path timing to zero;
- and
- determining the correlation value based on a product of the channel estimation values after the control and a noise estimation value.
A control method of an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control method comprising:
- determining respective channel estimation values of the each path timing;
- detecting a path timing, the channel estimation value of which is to be set to zero, based on a reception power of the path timing and a predetermined power threshold;
- setting a channel estimation value of the detected path timing to zero;
- determining whether or not a reception status of the received sequence indicates a non-multipath status or not based on a reception power of the each path timing;
- and
- increasing the power threshold when it is determined that a non-multipath status is indicated, and reducing the power threshold when it is determined that a multipath status is indicated.
A control apparatus for an equalizer that weighting-combines a received sequence using a weighted-combined coefficient obtained based on channel estimation values of each path timing of signals incoming from a plurality of paths and correlation values between each path, the control apparatus comprising:
- a channel estimation unit that determines respective channel estimation values of the each path timing;
- a channel estimation value control unit that detects a path timing other than the path timing having a power greater than a predetermined power threshold and the path timing within a predetermined timing threshold including the path timing having the power greater than the power threshold as a path timing, the channel estimation value of which is to be set to zero and sets a channel estimation value of the detected path timing to zero, wherein
- the channel estimation value control unit determines whether or not a reception status of the received sequence indicates a non-multipath status based on a reception power of the each path timing, and wherein
- the channel estimation value control unit controls the timing threshold according to the determined reception status.
Dependencies are inferred from the claim text.