JP6483602B2 - Radio receiver and received signal processing method for radio receiver - Google Patents

Description

  The present invention relates to a radio receiver that receives a signal transmitted by a terminal and a received signal processing method of the radio receiver.

  To realize an IoT (Internet of Things) society in which all objects (things) are connected to the Internet, a low-power wireless transmitter is required. As a method for reducing the power consumption of the wireless transmitter, in addition to reducing the power of the circuit itself, it is also effective to reduce the power at the communication protocol level.

  As one effective method for reducing power at the communication protocol level, a method for reducing the time required for communication by reducing the preamble (synchronization code) of the transmitting terminal has been proposed (for example, non-transmission). Patent Document 1).

"Power Saving Method Using Short Preamble in Sensor Networks" (2010 IEICE General Conference B-20-42)

  However, the reduction of the preamble makes it difficult for the wireless receiver side to expand the dynamic range by automatic gain control generally used in wireless standards such as WiFi and Bluetooth (registered trademark). This is because it is difficult to estimate received power due to the short preamble length.

  In response to this problem, the present applicant has considered a method of expanding the dynamic range by estimating external noise and setting a reception threshold based on this in a wireless receiver. This method has an advantage in that the operation is determined algorithmically and reception performance equivalent to that obtained when pseudo automatic gain control is performed by noise estimation can be obtained. According to this method, the length of the preamble can be reduced, and the power of the radio transmitter can be reduced.

  An outline of a technique that the applicant has considered before reaching the present invention (hereinafter referred to as a conventional technique) will be described. FIG. 17 shows a configuration example of the wireless reception system 3 including the wireless receiver 1 and the terminal 2. In the wireless reception system 3, the terminal 2 is a unidirectional wireless terminal such as a remote controller, and transmits a signal to the wireless receiver 1. The wireless receiver 1 receives a signal transmitted from the terminal 2.

  FIG. 18 shows a basic algorithm of the wireless receiver 1. The wireless receiver 1 takes in the signal from the terminal 2 via the AD converter and sets it as discretized sampling data (step S101). Then, the average value of the sampling data is calculated by moving average processing (step S102), and the average value is estimated as the noise level (step S103). Then, a threshold value is obtained from the estimated noise level and set as a reception threshold value (step S104).

  Then, the wireless receiver 1 converts the sampling data into large and small binary codes (“1” / “0”) using the set reception threshold, and performs a plurality of samplings before and after detecting the large and small codes. The maximum value of data is detected (step S105). Then, the preamble is detected at a time interval corresponding to the data transfer rate from the large code corresponding to the sampling data for which the maximum value has been detected (steps S106 and S107). When the detection of the preamble is completed (YES in step S107), the fixed pattern (identifier of terminal 2) following the preamble is detected (step S108). When the detection of the fixed pattern is completed (YES in step S108), the terminal 2 Decoding processing of the transmitted data is performed (step S109).

  FIG. 19 shows a functional block diagram of the wireless receiver 1 according to this basic algorithm. In the figure, 11 is an AD conversion block (ADC IF), 12 is a noise estimation block, and 13 is a demodulation block. In the basic algorithm shown in FIG. 18, the AD conversion block 11 performs the process of step S101, the noise estimation block 12 performs the processes of steps S102 to S104, and the demodulation block 13 performs the processes of steps S105 to S109.

  However, this conventional method is particularly problematic when the noise environment (noise environment) changes greatly, such as when the noise (noise) is low (in the metal wall) or when the noise is high (outside the metal wall). Occurs.

  Specifically, when the first noise estimation (noise estimation) result is very small noise, the reception threshold is also set to be small accordingly. At this time, when moving to a noisy environment, the receiver whose reception threshold is set low also reacts to the noise and continues to determine the preamble and the fixed pattern. That is, the determination of the preamble or the fixed pattern is continued with the noise estimation interrupted.

  For this reason, in the conventional method, if the preamble or the fixed pattern cannot be determined, the noise estimation continues to be interrupted, the noise estimation is not performed forever, and the reception threshold is kept low. Arise. This means that the receiver algorithm causes a deadlock, and includes a problem that a forced reset is required.

  In addition, as a symptomatic treatment, there is a method of setting a minimum value for the reception threshold, but since this minimum value varies depending on the environment, customization is required every time according to the environment.

  The present invention has been made in order to solve such a problem. The object of the present invention is to provide a radio that can set an appropriate reception threshold for an environment even when the noise environment changes greatly. To provide a reception signal processing method for a receiver and a wireless receiver.

  In order to achieve such an object, the present invention provides a first noise estimation unit for estimating noise superimposed on a received signal in a wireless receiver that receives a signal transmitted by a terminal, and the first noise estimation unit. A first noise estimation demodulator configured from a first demodulator that demodulates a received signal based on a noise estimation result estimated by the noise estimator, and estimates noise superimposed on the received signal A second noise estimation demodulator comprising a second noise estimator and a second demodulator that demodulates the received signal based on the noise estimation result estimated by the second noise estimator; A first noise estimation demodulating unit alternately repeats noise estimation in the first noise estimation unit and reception signal demodulation in the first demodulation unit, and the second noise estimation demodulation unit Noise estimation by the noise estimation unit 2 The demodulation of the reception signal in the second demodulation unit is alternately repeated, and the demodulation of the reception signal in the first demodulation unit is performed while the noise estimation is performed in the second noise estimation unit, Demodulation of the received signal in the second demodulator is performed while noise estimation is performed in the first noise estimator.

  In the present invention, a first noise estimation demodulator composed of a first noise estimator and a first demodulator, a second noise estimator and a second demodulator comprised of a second A noise estimation demodulator is provided, and the noise estimation demodulator is duplicated. In this duplicated noise estimation demodulation unit, when the noise estimation by the noise estimation unit and the demodulation of the reception signal by the demodulation unit are alternately repeated, and one of them is demodulating the reception signal, the other is Estimate noise. As a result, in any operating environment, a new noise estimation result will be reflected after a certain period of time, and even if the noise environment changes significantly, an appropriate reception threshold should be set for that environment. Is possible.

  According to the present invention, a first noise estimation demodulator composed of a first noise estimator and a first demodulator, a second noise estimator and a second demodulator configured. And a noise estimation demodulator, and the noise estimation demodulator is duplicated, so that the first noise estimation demodulator in the first noise estimation demodulator estimates the noise in the first demodulator and the received demodulator in the first demodulator Are alternately repeated, and the noise estimation in the second noise estimation unit and the demodulation of the received signal in the second demodulation unit in the second noise estimation demodulation unit are alternately repeated, and the first demodulation unit The received signal is demodulated while the second noise estimating unit performs noise estimation, and the received signal is demodulated by the second noise estimating unit. Because it was done while it was being done, it was constant in any operating environment After a lapse of between new noise estimation result is assumed to be reflected, it is possible to set an appropriate reception threshold even against the environment if the noise environment changes significantly.

FIG. 1 is a functional block diagram of a radio receiver according to the first embodiment of the present invention. FIG. 2 is a diagram for explaining noise estimation and reception signal demodulation that are alternately repeated in the duplex noise estimation demodulation block in the radio receiver according to the first embodiment. FIG. 3 is a time chart showing how noise estimation and received signal demodulation are alternately repeated in the duplex noise estimation demodulation block in the wireless receiver of the first embodiment. FIG. 4 is a time chart showing a situation when the operation timing of the duplexed noise estimation demodulation block is shifted in the radio receiver of the first embodiment. FIG. 5 is a functional block diagram of the radio receiver according to the second embodiment of the present invention. FIG. 6 is a diagram for explaining noise estimation and reception signal demodulation which are alternately repeated in the duplex noise estimation demodulation block in the radio receiver according to the second embodiment. FIG. 7 is a time chart showing how noise estimation and reception signal demodulation are alternately repeated in the duplexed noise estimation demodulation block in the wireless receiver of the second embodiment. FIG. 8 is a time chart showing a state when the operation timing of the noise estimation demodulation block duplexed in the wireless receiver of the second embodiment is shifted. FIG. 9 is a functional block diagram of the radio receiver according to the third embodiment of the present invention. FIG. 10 is a diagram for explaining noise estimation and reception signal demodulation that are alternately repeated in the duplex noise estimation demodulation block in the radio receiver according to the third embodiment. FIG. 11 is a time chart showing how noise estimation and reception signal demodulation are alternately repeated in the duplex noise estimation demodulation block in the wireless receiver of the third embodiment. FIG. 12 is a time chart showing a state when the operation timing of the duplexed noise estimation demodulation block is shifted in the wireless receiver of the third embodiment. FIG. 13 is a functional block diagram of the radio receiver according to the fourth embodiment of the present invention. FIG. 14 is a diagram for explaining noise estimation and reception signal demodulation that are alternately repeated in the duplex noise estimation demodulation block in the radio receiver according to the fourth embodiment. FIG. 15 is a time chart showing how noise estimation and reception signal demodulation are alternately repeated in the duplex noise estimation demodulation block in the wireless receiver of the fourth embodiment. FIG. 16 is a time chart showing a state when the operation timing of the noise estimation demodulation block duplexed in the wireless receiver of the fourth embodiment is shifted. FIG. 17 is a diagram illustrating a configuration example of a wireless reception system including a wireless receiver and a terminal. FIG. 18 is a diagram illustrating a basic algorithm of a conventional wireless receiver. FIG. 19 is a functional block diagram of a conventional radio receiver.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1: First Method]
FIG. 1 is a functional block diagram of a radio receiver according to an embodiment of the present invention. This wireless receiver 4 (4A) is the wireless receiver according to the first embodiment of the present invention, and is used in place of the wireless receiver 1 in the wireless reception system 3 shown in FIG.

  In FIG. 1, reference numeral 41 denotes an AD conversion block (ADC IF), 42A denotes a first noise estimation demodulation block, and 42B denotes a second noise estimation demodulation block.

  In this wireless receiver 4A, an AD conversion block 41 corresponds to the AD conversion block 11 in the wireless receiver 1 shown in FIG. 19, and takes in a signal from the terminal 2 through an AD converter and is digitized sampling data. And

  The first noise estimation demodulation block 42A corresponds to the combination of the noise estimation block 12 and the demodulation block 13 in the wireless receiver 1 shown in FIG. 19, and is superimposed on the sampling data from the AD conversion block 41. Noise (noise superimposed on the signal received by the radio receiver 4A) is estimated, a reception threshold is obtained as an estimation result of the noise, and the received signal is demodulated based on the obtained reception threshold.

  In the first noise estimation demodulation block 42A, noise estimation and reception threshold calculation are performed in the noise estimation block 421A, and reception signal demodulation based on the reception threshold is performed in the demodulation block 422A.

  This wireless receiver 4A is different from the wireless receiver 1 shown in FIG. 19 in that a second noise estimation demodulation block 42B is provided in addition to the first noise estimation demodulation block 42A, and the noise estimation demodulation block is duplicated. There is in point.

  Similarly to the first noise estimation demodulation block 42A, the second noise estimation demodulation block 42B also has noise superimposed on the sampling data from the AD conversion block 41 (noise superimposed on the signal received by the wireless receiver 4A). , And a reception threshold is obtained as the noise estimation result, and the received signal is demodulated based on the obtained reception threshold.

  In the second noise estimation demodulation block 42B, noise estimation and reception threshold calculation are performed in the noise estimation block 421B, and reception signal demodulation based on the reception threshold is performed in the demodulation block 422B.

  In the wireless receiver 4A, the noise estimation in the noise estimation block 421A and the demodulation of the reception signal in the demodulation block 422A in the first noise estimation demodulation block 42A are alternately repeated every 20 ms. In the noise estimation demodulation block 42B, noise estimation in the noise estimation block 421B and reception signal demodulation in the demodulation block 422B are alternately repeated every 20 ms.

  In this wireless receiver 4A, the received signal is demodulated in the demodulation block 422A in the first noise estimation demodulation block 42A, and the noise is estimated in the noise estimation block 421B in the second noise estimation demodulation block 42B. (See FIG. 2A), the received signal is demodulated in the demodulation block 422B in the second noise estimation demodulation block 42B, and noise estimation is performed in the noise estimation block 421A in the first noise estimation demodulation block 42A. Is performed during the period (see FIG. 2B).

  In this wireless receiver 4A, the first noise estimation demodulation block 42A corresponds to the first noise estimation demodulation unit referred to in the present invention, and the second noise estimation demodulation block 42B corresponds to the second noise estimation demodulation unit. . The noise estimation block 421A corresponds to the first noise estimation unit, and the noise estimation block 421B corresponds to the second noise estimation unit. The demodulation block 422A corresponds to the first demodulation unit, and the demodulation block 422B corresponds to the second demodulation unit.

  Hereinafter, the first noise estimation demodulation block 42A is the noise estimation demodulation block A, the second noise estimation demodulation block 42B is the noise estimation demodulation block B, the noise estimation block 421A is the noise estimation block A, and the noise estimation block 421B is the noise estimation block. B, the demodulation block 422A is called a demodulation block A, and the demodulation block 422B is called a demodulation block B, and the reference numerals thereof are omitted.

  FIG. 3 shows how noise estimation and reception signal demodulation are repeated in the noise estimation demodulation block A and noise estimation demodulation block B in the wireless receiver 4A. 3A shows how noise estimation and reception signal demodulation are alternately repeated in the noise estimation demodulation block A, and FIG. 3B is used for demodulation of the reception signal in the noise estimation demodulation block A. FIG. 3C shows how the reception threshold thA is obtained. FIG. 3C shows how noise estimation and reception signal demodulation are alternately repeated in the noise estimation demodulation block B. FIG. 3D shows the noise estimation demodulation block. A state in which a reception threshold thB used for demodulation of a reception signal at B is obtained is shown.

  As can be seen from the time chart shown in FIG. 3, in this wireless receiver 4A, in the noise estimation demodulation block A, the noise estimation in the noise estimation block A and the demodulation of the received signal in the demodulation block A are performed every 20 ms. The reception threshold thA is obtained as a noise estimation result in the noise estimation block A, and the obtained reception threshold thA is used for demodulation of the received signal in the demodulation block A.

  Further, in the noise estimation demodulation block B, the noise estimation in the noise estimation block B and the demodulation of the received signal in the demodulation block B are alternately repeated every 20 ms, and received as the noise estimation result in the noise estimation block B. The threshold value thB is obtained, and the obtained reception threshold value thB is used for demodulating the received signal in the demodulation block B.

  Further, demodulation of the received signal in the demodulation block A is performed while noise estimation is performed in the noise estimation block B, and demodulation of the received signal in the demodulation block B performs noise estimation in the noise estimation block A. It is done while

  As can be seen from the above description, in the wireless receiver 4A of the first embodiment, in the duplicated noise estimation demodulation block, the noise estimation in the noise estimation block and the demodulation of the received signal in the demodulation block are repeated alternately. If one is demodulating the received signal, noise estimation is performed on the other. As a result, in any operating environment, a new noise estimation result will be reflected after a certain period of time, and even if the noise environment changes significantly, an appropriate reception threshold should be set for that environment. Will be able to.

  In the wireless receiver 4A of the first embodiment, the operation timing of the noise estimation demodulation blocks A and B is set so that the demodulation operation of the reception signal in the demodulation block A and the demodulation operation of the reception signal in the demodulation block B do not overlap. However, since the noise estimation demodulation blocks A and B operate independently, the operation timing may be shifted. In this case, the demodulating operation of the received signal in the demodulating block A and the demodulating operation of the received signal in the demodulating block B may overlap, and double acquisition of data may occur.

  For example, as shown in FIG. 4, the operation timing of the noise estimation demodulation block A is shifted, and the demodulation operation of the reception signal in the demodulation block A and the reception signal in the demodulation block B are shown as surrounded by a one-dot chain line in the figure. The demodulation operation may overlap. In this case, the received signal is demodulated using the reception threshold thA in the demodulation block A, and the received signal is demodulated using the reception threshold thB in the demodulation block B, and different values of data are acquired from the same received signal (double acquisition). It will be done.

  In the wireless receiver 4A of the first embodiment, there is a possibility that such double acquisition of data may occur, but it is possible to separate the double acquisition by the subsequent processing, and this is the case inside the receiver. Alternatively, it can be performed on a network.

[Embodiment 2: Second Method]
FIG. 5 shows a functional block diagram of the wireless receiver 4 (4B) of the second embodiment. The radio receiver 4B according to the second embodiment has a configuration including a shared memory 43 as a storage destination of the reception thresholds thA and thB in addition to the configuration of the radio receiver 4A according to the first embodiment.

  The shared memory 43 facilitates the delivery of processing when the roles of the demodulation blocks A and B are changed over a certain period. By providing the shared memory 43, the noise estimation results in the noise estimation blocks A and B can be dynamically reflected on the demodulation blocks A and B. Therefore, a special algorithm is used for processing transfer. It is possible to operate without need. In addition, it is possible to prevent double acquisition of data due to the demodulation operation of the demodulation block A and the demodulation block B at the same time, and it is possible to reduce double acquisition cancellation processing at a later stage.

  In the wireless receiver 4B according to the second embodiment, the reception threshold thA obtained in the noise estimation block A and the reception threshold thB obtained in the noise estimation block B are rewritten in the order in which the reception thresholds are obtained, and the shared memory 43 Saved in. That is, when the reception threshold thA is obtained in the noise estimation block A of the noise estimation demodulation block A, the shared memory 43 is overwritten (see FIG. 6A), and the reception threshold thB in the noise estimation block B of the noise estimation demodulation block B is When obtained, the shared memory 43 is overwritten (see FIG. 6B), and this is repeated every 20 ms.

  FIG. 7 shows how noise estimation and demodulation of the received signal are repeated in the noise estimation demodulation block A and noise estimation demodulation block B in the wireless receiver 4B. FIG. 7A shows how noise estimation and reception signal demodulation are alternately repeated in the noise estimation demodulation block A, and FIG. 7B is used for demodulation of the reception signal in the noise estimation demodulation block A. FIG. 7C shows how the reception threshold thA and the reception threshold thB used when demodulating the reception signal in the noise estimation demodulation block B are obtained (change in the reception threshold in the shared memory 43). Fig. 2 shows how noise estimation and reception signal demodulation are alternately repeated.

  As can be seen from the time chart shown in FIG. 7, in this radio receiver 4B, in the noise estimation demodulation block A, the noise estimation in the noise estimation block A and the demodulation of the received signal in the demodulation block A are performed every 20 ms. The reception threshold thA is obtained as the noise estimation result in the noise estimation block A and overwritten in the shared memory 43, and the obtained reception threshold thA is used for demodulating the reception signal in the demodulation block A. It is done.

  Further, in the noise estimation demodulation block B, the noise estimation in the noise estimation block B and the demodulation of the received signal in the demodulation block B are alternately repeated every 20 ms, and received as the noise estimation result in the noise estimation block B. The threshold thB is obtained and overwritten in the shared memory 43, and the obtained reception threshold thB is used for demodulating the received signal in the demodulation block B.

  Further, demodulation of the received signal in the demodulation block A is performed while noise estimation is performed in the noise estimation block B, and demodulation of the received signal in the demodulation block B performs noise estimation in the noise estimation block A. It is done while

  As can be seen from the above description, in the radio receiver 4B of the second embodiment, the demodulated blocks using the reception thresholds thA and thB that are alternately overwritten in the shared memory 43 in the duplicated noise estimation demodulation blocks A and B The received signals are demodulated at A and B, and the processing is smoothly transferred when the roles of the demodulation blocks A and B are changed. In addition, since the noise estimation results in the noise estimation blocks A and B are dynamically reflected on the demodulation blocks A and B, it is possible to operate the processing without requiring a special algorithm.

  Note that, also in the wireless receiver 4B of the second embodiment, the demodulating operation of the received signal in the demodulation block A and the demodulating operation of the received signal in the demodulating block B do not overlap as in the wireless receiver 4A of the first embodiment. However, since the noise estimation demodulation blocks A and B operate independently, it is considered that the operation timing is shifted. In this case, the demodulation operation of the reception signal in the demodulation block A and the demodulation operation of the reception signal in the demodulation block B overlap, but there is no possibility that double acquisition of data will occur.

  For example, as shown in FIG. 8, the operation timing of the noise estimation demodulation block A is shifted, and the demodulation operation of the reception signal in the demodulation block A and the reception signal in the demodulation block B are shown as surrounded by a one-dot chain line in the figure. The demodulation operation may overlap. In this case, both the demodulation blocks A and B are demodulated using the reception threshold thA stored in the shared memory 43, so that different values of data are acquired (double acquired) from the same received signal. There is nothing.

[Embodiment 3: Third Method]
FIG. 9 shows a functional block diagram of the wireless receiver 4 (4C) of the third embodiment. In addition to the configuration of the wireless receiver 4A of the first embodiment, the wireless receiver 4C of the third embodiment controls the state of the noise estimation block A, the demodulation block A, the noise estimation block B, and the demodulation block B. The configuration includes a portion 44.

  In this wireless receiver 4C, the control unit 44 sets the noise estimation block A to the sleep state while the demodulation block A is demodulating the received signal (see FIG. 10A), and the noise estimation block A is in the noise state. During the estimation, the demodulation block A is set in the sleep state (see FIG. 10B). In addition, the noise estimation block B is set in the sleep state while the demodulation block B is demodulating the received signal (see FIG. 10B), and the demodulation block B while the noise estimation block B is estimating the noise. Is set to the sleep state (see FIG. 10A). FIG. 11 shows a time chart corresponding to FIG. 3, and FIG. 12 shows a time chart corresponding to FIG.

  According to the wireless receiver 4C of the third embodiment, since only one demodulation block and one noise estimation block are operating, the operating power is compared with the wireless receiver 4A of the first embodiment. , It is possible to reduce to about half. This wireless receiver 4C is effective particularly in the case of a receiver that assumes battery operation, and is excellent in that the battery life can be extended.

[Embodiment 4: Fourth Method]
FIG. 13 shows a functional block diagram of the wireless receiver 4 (4D) of the fourth embodiment. The wireless receiver 4D according to the fourth embodiment is similar to the wireless receiver 4C according to the third embodiment in addition to the configuration of the wireless receiver 4B according to the second embodiment (the configuration having the shared memory 43). A, the control block 44 for controlling the states of the demodulation block A, noise estimation block B, and demodulation block B is used. FIG. 14 shows a diagram corresponding to FIG. 6, FIG. 15 shows a diagram corresponding to FIG. 7, and FIG. 16 shows a diagram corresponding to FIG. According to the radio receiver 4D of the fourth embodiment, it is possible to further reduce power while preventing double acquisition of demodulated data, which is very effective.

[Extension of the embodiment]
The present invention has been described above with reference to the embodiment. However, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention.

  The present invention can be used for a wireless receiver of a unidirectional wireless communication system.

  4 (4A to 4D): wireless receiver, 41: AD conversion block, 42A: first noise estimation demodulation block (noise estimation demodulation block A), 42B: second noise estimation demodulation block (noise estimation demodulation block B) , 43 ... Shared memory, 44 ... Control unit, 421A ... Noise estimation block (noise estimation block A), 421B ... Noise estimation block (noise estimation block B), 422A ... Demodulation block (demodulation block A), 422B ... Demodulation block ( Demodulation block B).

Claims (5)

In the wireless receiver that receives the signal transmitted by the terminal,
A first noise estimation unit that estimates noise superimposed on the received signal, and a first demodulation unit that demodulates the received signal based on a noise estimation result estimated by the first noise estimation unit A first noise estimation demodulator configured by:
A second noise estimation unit that estimates noise superimposed on the received signal, and a second demodulation unit that demodulates the received signal based on a noise estimation result estimated by the second noise estimation unit A second noise estimation demodulator configured from
The first noise estimation demodulation unit is
Alternately estimating the noise in the first noise estimator and demodulating the received signal in the first demodulator,
The second noise estimation demodulation unit is
Alternately estimating the noise in the second noise estimator and demodulating the received signal in the second demodulator,
Demodulation of the received signal in the first demodulator
Performed while noise estimation is performed in the second noise estimation unit,
Demodulation of the received signal in the second demodulator
The wireless receiver, which is performed while noise estimation is performed by the first noise estimation unit. The radio receiver according to claim 1,
A shared memory in which the noise estimation result in the first noise estimation unit and the noise estimation result in the second noise estimation unit are stored while being rewritten in the order in which the estimation results were obtained;
The first demodulator includes:
The noise estimation result stored in the shared memory is used as the noise estimation result estimated by the first noise estimation unit, and the received signal is demodulated.
The second demodulator is
A radio receiver, wherein the received signal is demodulated using the noise estimation result stored in the shared memory as the noise estimation result estimated by the second noise estimation unit. The radio receiver according to claim 1,
While the first demodulator is demodulating the received signal, the first noise estimator is in a sleep state, and while the first noise estimator is estimating the noise, the first noise estimator is in the sleep state. While the demodulator is in the sleep state, the second noise estimator is in the sleep state while the second demodulator is demodulating the received signal, and the second noise estimator estimates the noise. A wireless receiver comprising: a control unit that puts the second demodulating unit into a sleep state while the computer is in a sleep state. The radio receiver according to claim 2,
While the first demodulator is demodulating the received signal, the first noise estimator is in a sleep state, and while the first noise estimator is estimating the noise, the first noise estimator is in the sleep state. While the demodulator is in the sleep state, the second noise estimator is in the sleep state while the second demodulator is demodulating the received signal, and the second noise estimator estimates the noise. A wireless receiver comprising: a control unit that puts the second demodulating unit into a sleep state while the computer is in a sleep state. In a received signal processing method of a wireless receiver that receives a signal transmitted by a terminal,
A first noise estimator for estimating noise superimposed on the received signal; a first demodulator for demodulating the received signal based on a noise estimation result estimated by the first noise estimator; Based on a noise estimation result estimated by the second noise estimation unit, a second noise estimation unit configured to estimate noise superimposed on the received signal, And a second noise estimation demodulator configured by a second demodulator configured to demodulate the received signal, thereby duplicating the noise estimation demodulator,
In the first noise estimation demodulator, the noise estimation in the first noise estimator and the demodulation of the received signal in the first demodulator are alternately repeated,
In the second noise estimation demodulator, the noise estimation in the second noise estimator and the demodulation of the received signal in the second demodulator are alternately repeated,
The reception signal is demodulated by the first demodulator while the noise is estimated by the second noise estimator.
A reception signal processing method of a radio receiver, wherein demodulation of a reception signal in the second demodulation unit is performed while noise estimation is performed in the first noise estimation unit.

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