JP2001016162A - Intermittent receiver and intermittent reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have a high data transmission efficiency and to secure long waiting operation time by successively storing demodulation signals, successively outputting them after detection of a unique word, interrupting a power source of a reception part including at least a demodulation circuit, a unique word detecting circuit and an accumulating circuit after reception of a radio frame to be received and feeding the power source of the reception part after a specified time elapses. SOLUTION: At the time of feeding the power source of a terminal station, a control means 8 applies a reception part power source 9. When the reception part power source 9 is applied, a demodulating means 2 establishes synchronism. A time needed for synchronism establishment of the demodulating means 2 from application of the reception part power source 9 is defined as a (Tp). When the demodulating means 2 establishes the synchronism, an accumulating means 5 successively accumulates a demodulation signal 101 which the demodulating means outputs. The accumulating means 5 eliminates a unique word(UW) from the accumulated demodulation signals and inputs them to a Viterbi decoding means 7. The Viterbi decoding means 7 decodes parts higher than an ending part (Tpm) of a frame of accumulation immediately before the UW and an output converges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal receiving apparatus of a radio communication system comprising a base station and a terminal station, and requires power saving which is particularly suitable for a portable terminal station for mobile use. The present invention relates to an intermittent receiving device and an intermittent receiving method.

[0002]

2. Description of the Related Art A mobile satellite communication system shown in, for example, FIG. 6A is known as an example of this type of wireless communication system.

[0003] In FIG. 6 (a), a base station 601 is connected to each of terminal stations 603-1 through 603- via a communication satellite 602.
m, digital information is communicated in a time-division multiplexing (TDM) system in units of radio frames of a predetermined format.

FIG. 6B shows an example of the configuration of a radio frame.
Shown in Each radio frame is transmitted in time series, and each frame is composed of a unique word (UW), a frame number (FN), frame data (FD), and a flash bit (FB). The bold line portions in the figure indicate wireless frames addressed to the terminal station (frames addressed to the own station).

[0005] Each data constituting the radio frame will be described below.

[0006] As described below, UW is information for determining the phase of a demodulated signal in a receiving unit of a terminal station.

Conventionally, in this type of wireless communication system, communication is mainly performed by polyphase modulation such as QPSK. The reason is that data can be transmitted efficiently with excellent C / N characteristics in long-distance communication.

[0008] In addition, a synchronous detection means is often used in the receiving unit of the terminal station device. The reason is that even under conditions of satellite communication in which the signal power of the received radio wave is weak, the detected signal has a good bit error rate characteristic and is advantageous for stable reception.

However, a demodulated signal of polyphase modulation using synchronous detection has phase ambiguity, and the signal cannot be specified. Therefore, in order to remove the phase ambiguity on the receiving side (determine and determine the phase), a UW is provided in the radio frame.

That is, the UW consists of a fixed bit string that is configured to be able to determine the phase of the received signal by the detection timing when detected by the UW detection means provided in the receiving unit of each terminal station. Data.

The FN is an identification number of a radio frame, and is referred to in each terminal station to identify the radio frame.
In FIG. 6B, FN = 1 and FN = 2 are sequentially assigned,
An example in which FN = Max is set as the maximum value and the processing is repeated from FN = 1 again is shown.

The FD is a data body to be communicated, for example,
This includes digital data of a voice signal of a call, but also includes information for controlling each terminal station.

That is, destination terminal station identification information indicating the destination of the radio frame, call information for calling the destination terminal station, and
Next, the FN (NF
N). Each terminal station detects a frame addressed to itself by referring to the destination terminal station identification information. The NFN is referred to in an intermittent reception operation described later.

The FB is generally a data consisting of a fixed bit string, which is used for dividing the spread area of the output data of the encoding means by inputting to the Viterbi encoding means for encoding.

In the base station, data addressed to each terminal station is Viterbi-encoded by an encoding means and transmitted. At this time, FN, FD, and FB of each radio frame are continuously input to the encoding unit, encoded, and UW is inserted before transmission. For this reason, the FN of each radio frame is coded continuously to the FB of the previous frame.

For this reason, a constant continuous state is set at the boundary between the radio frames output by the encoding means, for example, the boundary between the FB at the end of the immediately preceding frame and the FN of the frame addressed to the own station as shown in FIG. Is generated. As a result, the receiving device of each terminal station can input the data to the Viterbi decoding unit in the known state from the FN head of the frame addressed to the own station and perform the decoding process properly.

Next, a request for a longer standby operation time of the terminal station will be described.

This type of radio communication system usually has a large number of terminal devices, and terminal devices that are not in a communication state wait for call information from a base station. Of these, in mobile terminals, especially portable battery-powered terminals, there is a strong demand for a longer standby operation in a non-communication state.
In order to reduce the power consumption during the standby operation, so-called intermittent reception is performed.

Since each terminal station only needs to receive a frame addressed to itself during the standby operation, the power of the receiving section is cut off during other periods to reduce power consumption. At this time, by referring to the FN of the frame addressed to the own station and the NFN included in the FD, the time until the next frame addressed to the own station is calculated, and the power supply of the receiving unit is interrupted.

A conventional intermittent reception operation of a terminal station will be described with reference to the drawings.

FIG. 7A is a block diagram of a terminal station of a conventional radio communication system, and FIG. 7B is a block diagram of a receiving apparatus.

As shown in FIG. 7A, a transmitting unit 702 and a receiving unit 703 are connected to an antenna 701 of a terminal station. The transmitting unit 702 and the receiving unit 703 include an audio signal processing unit 7
04 and control means 705 are connected. Control means 7
05 is connected to a receiving unit power supply 706 and a timer 707. The receiving unit power supply 706 is connected to the receiving unit 703,
The power is supplied to the receiving unit 703 under the control of the control unit 705.

FIG. 7B shows a portion 708 surrounded by a broken line in FIG. 7A, and particularly shows the receiving section 703 in FIG. 7A in detail.

In FIG. 7B, a demodulating means 2 is connected to a receiving means 1 for receiving a signal from an antenna 701. The demodulation means 2 is connected to the UW detection means 3 and the phase ambiguity removal means 6. Phase ambiguity removing means 6
Is connected to a Viterbi decoding unit 7. The Viterbi decoding unit 7 is connected to an output terminal for passing an output signal to a subsequent audio signal processing unit 704, and a control unit 705.

On the other hand, the UW detecting means 3 is connected to a frame synchronizing means 4. A phase ambiguity removing unit 6 and a Viterbi decoding unit 7 are connected to the frame synchronizing unit 4.

Next, the intermittent reception operation of the receiving apparatus of FIG. 7 will be described with reference to FIG.

FIG. 8A shows an output signal (demodulated signal) 711 of the demodulation means 2 in FIG. 8 (a) indicates a frame addressed to the own station. Tn indicates the time from when a frame addressed to the own station is received until when a frame addressed to the next own station is received. (B) shows the operation of the receiving unit 703,
(C) shows the operation of the receiving unit power supply 706. (C)
Ti indicates the time from when the receiving unit power supply 706 is turned off during the intermittent reception operation to when the receiving unit power supply 706 is turned on to receive the next frame addressed to the own station.

FIG. 8 shows the operation of the intermittent receiving apparatus for receiving a frame addressed to the own station once during the intermittent receiving operation. Explanation will be given including supplementary information.

When the power supply of the terminal station is turned on, the control means 705 turns on the receiving section power supply 706. When the receiving section power supply 706 is turned on, the demodulation unit 2 establishes synchronization by taking carrier synchronization and clock synchronization by a generally known phase locked loop (PLL). Let Tp be the time required to establish synchronization from turning on the receiving unit power supply 706 ((c) and (b)).

When the demodulating means 2 establishes synchronization, the UW detecting means 3 starts the UW detecting operation. Various configurations of the UW detecting means 3 are known, and thus description thereof is omitted. Ta indicates the time required for the UW detection operation to stabilize.

When the UW detecting means 3 detects the UW, it notifies the frame synchronizing means 4 of the phase discrimination information 712.

The frame synchronization means 4 establishes frame synchronization based on the notification from the UW detection means 3, performs processing such as synchronization protection, and transmits frame synchronization information 713 to the demodulation means 2 in order to stably maintain the frame synchronization. In this way, the demodulation means 2 performs control such that the loop band is appropriately selected and the like so that the signal can be stably received.

When the frame synchronization is established, the frame synchronization means 4 removes the phase ambiguity by the phase discrimination information 712 from the UW detection means 3 so as to remove the phase ambiguity.
To bring the Viterbi decoding means 7 into a known state. Next, the phase of the received frame is determined by the phase ambiguity removing unit 6 and input to the Viterbi decoding unit 7.

Here, regarding the phase ambiguity removing means 6,
The case of the QPSK modulation method will be described as an example with reference to FIG.

FIG. 9A shows quadrature components a and b of the output signal of the demodulation means 2 in the case of the QPSK phase modulation system.
FIG. 4B is an explanatory diagram showing four coordinate axis directions that can be considered based on the phase ambiguity.
(C) is a block diagram showing the configuration of the phase ambiguity removing means 6 in each coordinate system of (1), (2).

In FIG. 9 (c), two's complement generating means 6 for generating two's complements at input terminals a and b, respectively.
-1 and 6-2 are connected. Input signals a, b, and -a and -b output from the two's complement generation means are connected to the selection means 61, arbitrarily selected by the internal two-system switching means, and output as I and Q signals. .

The phase ambiguity removing means 6 determines the phase of the demodulated signal under the control of the frame synchronizing means 4 and outputs it. The demodulation unit 2 synchronously detects the output signal of the reception unit 1 and outputs a demodulated signal 711 which has an orthogonal relationship between a and b. “a” and “b” are multi-valued data by soft decision, and the values are positive and negative and are represented by two's complement. Assuming that a has a phase relationship advanced by π / 2 with respect to b, the orthogonal coordinate axes of a and b can take the four cases shown in FIG. 9A due to the phase ambiguity of the demodulated signal 711. . I, Q in each case
Is obtained by the conversion formula shown in the table of FIG. For this reason, as shown in FIG. 9C, the phase ambiguity removing means 6 includes two's complement generating means 6-1 and 6 for a and b, respectively.
The switching means 61 is switched according to the control of the frame synchronization means 4 in accordance with FIG. 9B, and a, b, -a, and -b are output to each of the I and Q outputs. In this way, the phase ambiguity removing means 6 determines the phase of the demodulated signal 711 and outputs it.

Returning to FIG. 7 and FIG. 8, the Viterbi decoding means 7 in a known state receives the FN of the received frame from the beginning, decodes it properly, and outputs it.

The control means 705 receives the output 715 of the Viterbi decoding means 7 and operates until the frame addressed to the own station is detected.
Check the FD of each received frame.

When a frame addressed to the own station is detected, the call information is checked. When the call information is detected, a response operation is started.

If no call information is detected, the time Ti until the start of the next receiving operation is calculated with reference to the FN and NFN of the frame addressed to the own station. This is timed by means 707
, The receiving unit power supply 706 is turned off, and the operation shifts to the intermittent receiving operation (c).

Ti is calculated by the following equation. Ti = Tn−Ton (1) Tn is obtained from the values of NF and NFN of the frame addressed to the own station when FN <NFN Tn = (NFN−FN) × Tf (2) When FN> NFN Tn = (Max + NFN) −FN) × Tf (3) where Tf is the time of one radio frame and Max is F
The maximum value of N Ton = Tp + Ta + Tf + Tuw + Tpm + Tr (4) where Tuw is the time of one unique word and Tp
m and Tr will be described below.

The Viterbi decoding means generally has a path memory determined by the transition path length of the Viterbi code, and sequentially inputs input signals to the path memory for decoding.

Therefore, if the time corresponding to the path memory length of the input signal is Tpm and the time required for decoding the signal input to the path memory is Tr, the Viterbi decoding means decodes and outputs the end of each radio frame. Is the FN of the next frame
It is Tpm + Tr after the head input.

Accordingly, in the above description, the control means 7
05 detects a frame addressed to the own station after Tr when the data of Tpm is input from the FN head of the frame immediately after the frame addressed to the own station. The timing of power-off of the receiving unit in FIG. 8C indicates this.

When the time Ti elapses after the receiving section power supply 706 is turned off, the timer 707 notifies the controller 705,
The control unit 705 turns on the receiving unit power supply 706. The turning-on timing of the receiving unit power supply 706 at this time is as shown in FIG. When the receiving unit power supply 706 is turned on, the receiving unit 703 performs an intermittent receiving operation.

That is, the demodulation means 2 establishes synchronization again and outputs the demodulated signal 711. The time from when the receiving unit power supply 706 is turned on until the synchronization is established is defined as Tp ((c) and (b)). When the demodulation means 2 establishes synchronization, the UW detection means 3 starts the UW detection operation, and outputs the UW detection signal from the demodulated signal 711.
Is detected, the phase synchronization information 71 is stored in the frame synchronization means 4.
Notify 2. The frame synchronization unit 4 controls the phase ambiguity removal unit 6 and the Viterbi decoding unit 7 to decode the frame addressed to the own station.

The control means 705 checks the call information addressed to its own station, and if there is a call, it starts a response operation. If there is no call, it calculates the next Ti from FN and NFN, and calculates this Ti.
07, the receiving unit power supply 706 is turned off, and the intermittent receiving operation is continued.

As described above, in the conventional receiving apparatus,
By calculating Ti from FN and NFN included in the FD of the radio frame addressed to the own station and performing the intermittent reception operation, the radio frame to be received is accurately received and the power consumption during standby is reduced.

Further, since the FB is provided at the end of each radio frame, if control is performed so that the power of the receiving unit is turned on during the frame immediately before the frame addressed to the own station, the UW of the frame addressed to the own station is detected. Since the phase could be determined and the frame destined for the own station could be immediately decoded properly, the power-on time for receiving the frame addressed to the own station was minimized in the intermittent reception operation, and the long standby operation time was secured. I was

However, since the end of each radio frame includes an FB consisting of a fixed bit string, the frame structure has a high degree of redundancy with respect to the amount of information to be communicated, and is disadvantageous in terms of data transmission efficiency described below. there were.

Next, a request for improving the data transmission efficiency of this type of wireless communication system will be described.

In recent years, even in this type of wireless communication system, there has been an increasing demand for a large data transmission capacity. As a countermeasure, it is conceivable to suppress the redundancy of information constituting the radio frame, increase the amount of FD data per frame, and improve the transmission efficiency.

Specifically, it is conceivable that the FB in the radio frame is deleted, and this portion is applied to the FD to increase the data transmission amount per frame.

However, as described above, by disposing the FB at the end of the radio frame, it is possible to input the frame addressed to the own station from the beginning of the FN to the Viterbi decoding means in a known state, and to properly decode the frame. It is data to be.

Therefore, if this is deleted, it will not be possible to decode properly even if a frame addressed to the own station is input from the beginning of the FN to the Viterbi decoding means in a known state. For this reason, during the intermittent reception operation, as described below, the power must be turned on at an earlier timing, the power consumption increases, and the duration of the standby operation decreases.

FIG. 10 shows the intermittent reception operation of the terminal station in FIG. 7 when the FB is deleted from the configuration of the radio frame. FIG.
(A) to (c) of 0 correspond to the same reference numerals in FIG.

To properly decode the frame addressed to the own station without using the FB, the demodulated signal from which the phase ambiguity has been removed is input to the Viterbi decoding means 7, and after the output converges, the signal is continuously addressed to the own station. It must be configured to accept frames.

In general, from the start of input to the time when the output of the Viterbi decoding means converges, it is necessary to perform a decoding process on a signal of Tpm or more.

Therefore, the phase ambiguity of the input signal must be removed at least Tpm before the start of the frame addressed to the own station.

Since the phase of the demodulated signal can be determined when the UW is detected, the UW of the immediately preceding frame is detected to determine the phase before the UW of the frame addressed to the own station.

[0062] As shown in FIG.
06 is input before Tp + Ta before the head of the immediately preceding frame, synchronization is established before the UW reception of the immediately preceding frame, and the UW
Ensure stable detection operation. In (b), when the phase is determined by detecting the UW of the immediately preceding frame, the phase ambiguity is sequentially removed from the head of the FN of the immediately preceding frame and the phase is input to the Viterbi decoding means 7. Since the output of the Viterbi decoding means 7 converges before the reception of the frame addressed to the own station, the continuously input frames addressed to the own station are properly decoded.

As described above, in a system that does not use FB, the receiving unit power supply 706 must be turned on one frame or more ahead of the case where FB is used. The formula for calculating Ton is shown below.

In the system of FIG. 8 using FB, Ton = Tp + Ta + Tf + Tuw + Tpm + Tr (5) In the system of FIG. 10 not using FB, Ton = Tp + Ta + 2Tf + Tuw + Tpm + Tr (6) Then Tf
Is only getting longer. As a result, the power consumption during the intermittent operation increases, and the standby operation time decreases.

[0065]

As described above,
Conventionally, this type of wireless communication system has a disadvantage that data transmission efficiency is poor in a system that includes FB in a radio frame, and a disadvantage that a standby operation time of a terminal station is short in a system that does not include FB. .

Therefore, an object of the present invention is to provide a radio frame with F
It is an object of the present invention to provide an intermittent receiving apparatus and an intermittent receiving method that do not include B, have high data transmission efficiency, and can secure a long standby operation time.

[0067]

In order to solve the above-mentioned problem, the first intermittent receiving apparatus of the present invention sequentially accumulates demodulated signals when the receiving section is turned on during the intermittent receiving operation. After UW detection, this is used to converge the Viterbi decoding means in a short time.

More specifically, storage means (5 in FIG. 1) for storing the received demodulated signal, UW detection means (3 in FIG. 1) for detecting UW, and phase ambiguity removal means (3 in FIG. 1) 6)
And Viterbi decoding means (7 in FIG. 1).

Further, for intermittent reception operation, it has a control means (8 in FIG. 1), a receiving unit power supply (9 in FIG. 1), and a time measuring means (10 in FIG. 1).

The second intermittent receiving apparatus of the present invention generates all demodulated data sequences based on the phase ambiguity of the demodulated signal when the power of the receiving unit is turned on during the intermittent receiving operation, and decodes and converges the respective data sequences by the Viterbi decoding means. . After UW detection, the correct phase decoding means output is selected.

More specifically, means (11 in FIG. 3) for generating n data sequences (n is the number of phases in the polyphase modulation method) based on the phase ambiguity of the received demodulated signal, and a plurality of Viterbi It has a decoding means (7 in FIG. 3) and a selection means (12 in FIG. 3) for selecting outputs of a plurality of Viterbi decoding means.

Further, for intermittent reception operation, it has a control means (13 in FIG. 3), a receiving unit power supply (14 in FIG. 3), and a time measuring means (15 in FIG. 3).

(Operation) The first intermittent receiving apparatus of the present invention comprises:
When the receiver power is turned on, the demodulated signals are sequentially accumulated. Therefore, even if the power of the receiving unit is turned on in the middle of the frame immediately before the frame addressed to the own station, after detecting the UW, the Viterbi decoding means is made to converge in a short time by using the accumulated demodulated signal, and The destination frame can be properly decoded. As a result, during the intermittent reception operation, the power-on time of the receiving unit every time can be minimized, so that a long standby operation time can be secured.

The second intermittent receiving apparatus of the present invention generates all demodulated data sequences based on the phase ambiguity of the demodulated signal when the power supply of the receiving section is turned on, and decodes them by the Viterbi decoding means. For this reason, even if the power of the receiving unit is turned on in the middle of the frame immediately before the frame addressed to the own station, the output of each decoding means converges before decoding the frame addressed to the own station, and the frame addressed to the own station is properly adjusted. Can be decrypted. After UW detection, an appropriate decoding output is obtained by selecting the decoding means output of the data series having the correct phase. As a result, the power-on time of the receiving unit power supply can be minimized, so that a long standby operation time can be secured.

[0075]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1A is a block diagram of a terminal station of a radio communication system according to a first embodiment of the present invention.
(B) is a block diagram of the intermittent receiver.

As shown in FIG. 1A, a transmitting section 112 and a receiving section 113 are connected to an antenna 111 of a terminal station. The transmitting unit 112 and the receiving unit 113 include the audio signal processing unit 1
14 and the control means 8 are connected. The control unit 8 is connected to a receiving unit power supply 9 and a timing unit 10. The receiving unit power supply 9 is connected to the receiving unit 113 and supplies power under the control of the control unit 8.

FIG. 1B shows an intermittent receiving apparatus 115 surrounded by a broken line in FIG. 1A, and particularly shows the receiving section 113 in FIG. 1A in detail.

As shown in FIG. 1B, a demodulating means 2 is connected to a receiving means 1 for receiving a signal from an antenna. The demodulation means 2 includes a UW detection means 3 and a storage means 5
Is connected.

The storage means 5 is constituted by a semiconductor memory device such as a memory device, a shift register device, a FIFO memory device, etc., and a combination thereof. The following description of the operation will be made assuming that the storage means 5 is configured by a memory element.

The storage means 5 is connected to the phase ambiguity removing means 6, and the phase ambiguity removing means 6 is connected to the Viterbi decoding means 7. The Viterbi decoding unit 7 is connected to an output terminal for passing an output signal to a subsequent audio signal processing unit, and a control unit 8. The control unit 8 is connected to a receiving unit power supply 9 and a timing unit 10.

On the other hand, the frame synchronization means 4 is connected to the UW detection means 3. The storage unit 5, the phase ambiguity removal unit 6, and the Viterbi decoding unit 7 are connected to the frame synchronization unit 4.

The demodulation means 2, the UW detection means 3, the frame synchronization means 4, the storage means 5, the phase ambiguity elimination means 6, and the Viterbi decoding means 7 are connected to the power supply 9 for the receiving section. Power is supplied by The receiving unit power supply 9 supplies power to the demodulation unit 2, the UW detection unit 3, the frame synchronization unit 4, the accumulation unit 5, the phase ambiguity removal unit 6, and the Viterbi decoding unit 7 by using an FET (power MOSFET).
T) has a semiconductor switch element and is turned ON / OFF. This semiconductor switch element may be independently controlled as a configuration individually provided for each means.

Next, the intermittent reception operation of the intermittent receiver of FIG. 1 will be described with reference to FIG. FIG. 2A shows the demodulated signal 101 of FIG. The thick line in FIG. 2A indicates a frame addressed to the own station. Tn indicates the time from when a frame addressed to the own station is received until when a frame addressed to the next own station is received. Tn is calculated by the following equations (9) and (10). (B) shows the operation of the receiving unit 113,
(B-1) to (b-3) show the input operation of the storage unit 5, the output operation of the storage unit 5, and the output operation of the Viterbi decoding unit, respectively. (C) shows the operation of the receiving unit power supply 9.
Ti indicates the time from when the decoding of the frame addressed to the own station is completed and the receiving unit power supply 9 is turned off to when the receiving unit power supply 9 is turned on to receive the next frame addressed to the own station during the intermittent reception operation. ing.

FIG. 2 shows the operation of the intermittent receiving apparatus for receiving a frame addressed to the own station once during the intermittent receiving operation. Therefore, the operation from the power-on of the terminal station to the start of the intermittent receiving operation will be described. Is explained including supplementary information.

When the power of the terminal station is turned on, the control means 8 turns on the power supply 9 of the receiving section. When the receiving unit power supply 9 is turned on, the demodulation unit 2 establishes synchronization. The time required to establish the synchronization of the demodulation means 2 after the power supply of the receiving unit 9 is turned on is defined as Tp ((c) and (b)).

When the demodulation unit 2 establishes synchronization, the accumulation unit 5 sequentially accumulates the demodulated signal 101 output from the demodulation unit 2 (b-1).

On the other hand, when the demodulation means 2 establishes synchronization, the UW detection means 3 starts the UW detection operation. When UW is detected, the phase synchronization information is notified to the frame synchronization means 4.

The frame synchronization means 4 establishes frame synchronization based on the notification from the UW detection means 3, performs processing such as synchronization protection, and transmits the frame synchronization information 103 to the demodulation means 2 in order to stably maintain the frame synchronization. In this way, the demodulation means 2 performs control such that the loop band is appropriately selected and the like so that the signal can be stably received.

When the frame synchronization is established, the frame synchronization means 4 controls the phase ambiguity removal means 6 so as to determine the phase based on the phase discrimination information 102 from the UW detection means 3, and sets the Viterbi decoding means 7 to a known state. (104). Next, the storage means 5 is controlled, the data stored in the storage means 5 is read out, the phase is determined by the phase ambiguity removal means 6, and is input to the Viterbi decoding means 7 (b-2).

Here, the frame synchronization means 4 notifies the storage means 5 of the UW detection signal from the UW detection means 3 (104). The storage means 5 determines the UW storage address on the memory based on the timing of receiving the UW detection signal.
As a result, the storage unit 5 does not output the UW portion stored in the memory, but continuously outputs the FN and FD of the frame addressed to the own station and the FW of the frame immediately after the end of the FD of the immediately preceding frame.
N and FD are output.

When the storage means 5 is constituted by a shift register element or a FIFO memory element, the storage means 5 determines the UW storage position on the shift register or the FIFO memory based on the timing of receiving the UW detection signal. . The storage means 5 stores the UW portion in a shift register,
Alternatively, it is read out from the FIFO memory and discarded, and is not output to the Viterbi decoding means 7. As a result, the FN, FD,
Further, it outputs FN and FD of the immediately following frame.

The storage means 5 removes the UW from the stored demodulated signal and inputs it to the Viterbi decoding means 7.

The output of the Viterbi decoding means 7 converges by decoding the portion of the frame stored immediately before the UW which is output from the storage means 5 and which is equal to or more than the end Tpm. The frame in which the UW has been detected is continuously input thereto, so that it is appropriately decoded and output to the control means 8.

Note that, depending on the power-on timing of the terminal station, U
If a demodulated signal of Tpm or more is not accumulated before the input of the frame in which W is detected, proper decoded data cannot be obtained because the Viterbi decoding means 7 does not sufficiently converge. In this case, the control unit 8 continues the operation of the receiving unit 703 and starts the following check from the appropriate decoded data obtained in the next frame.

The control means 8 inputs the decoded data 105 and checks the FD of each received frame until a frame addressed to the own station is detected.

When a frame addressed to the own station is detected, the call information is checked. When the call information is detected, a response operation is started.

If no call information is detected, the time Ti1 until the start of the next reception operation is calculated with reference to the FN and NFN of the frame addressed to the own station. This is timed by means 10
And the receiving unit power supply 9 is turned off, and the operation proceeds to the intermittent receiving operation (c).

Ti1 is calculated by the following equation. Ti1 = Tn-Ton1 (7) Here, Tn is obtained from the values of NF and NFN of the frame addressed to the own station when FN <NFN. Tn = (NFN−FN) × Tf (8) When FN> NFN Tn = (Max + NFN−FN) × Tf (9) where Tf is the time of one radio frame, and Max is F
Maximum value of N Ton1 = Tp + Tpm + Tw + Tpm + Td + Tpm + Tr (10) From Tuw + Td = Tf (11), Ton1 = Tp + 3Tpm + Tf + Tr (12) In this embodiment, the value of Ti1 is the F of the wireless frame.
Although the calculation is performed using the FN and NFN included in D, the present invention is not limited to this method. For example, Ti1 may be included in a radio frame.
1 may be a fixed value according to the system.

When the time Ti1 elapses after the power supply of the receiver 9 is turned off, the timer 10 notifies the controller 8 and the controller 8 turns on the power supply 9 of the receiver (c). The turning-on timing of the receiving unit power supply 9 at this time is as shown in FIG. When the receiving unit power supply 9 is turned on, the receiving unit 113 performs an intermittent receiving operation.

That is, the demodulation means 2 establishes synchronization again and outputs the demodulated signal 101. Let Tp be the time from when the power supply 9 is turned on until the synchronization is established ((c) and (b)).

When the demodulation means 2 establishes synchronization, the storage means 5 stores the demodulated signal 101 in the middle of the immediately preceding frame, continuously with a portion of the end Tpm or more, the frame addressed to the own station, and the UW and FN heads of the immediately following frame. Tpm and decoding processing time (Tr) are sequentially accumulated (b-1).

On the other hand, the UW detection means 3 starts the UW detection operation when the demodulation means 2 establishes synchronization, and notifies the frame synchronization means 4 of the phase discrimination information 102 when UW is detected.

8 and 10 is a time Tp for storing the demodulated signal at the end of the immediately preceding frame in the storage means 5.
m.

The frame synchronization means 4 establishes frame synchronization based on the notification from the UW detection means 3. Thereafter, the synchronization is maintained in the same manner as when the terminal station is powered on, and the phase ambiguity removing means 6 and the Viterbi decoding means 7 are controlled to decode the frame addressed to the own station (b-2).

The Viterbi decoding means 7 properly decodes a frame addressed to the own station which is continuously inputted at the end of the immediately preceding frame. After the Tr of the frame addressed to the own station is input, the head decoded data of the frame addressed to the own station is output after Tr, and the end data of the frame addressed to the own station is output after Tr where the data of Tpm is input from the head of the FN of the immediately following frame. Thus, the decoding process is completed (b-3).

The control means 8 inputs the decoded data 105 and, when the decoding means 7 completes the decoding processing of the frame addressed to the own station, checks the FD call information and starts the response operation when the call information is detected.

If there is no call information, the next power-off time Ti1 is calculated from FN and NFN, this is set in the timer 10, the power supply 9 in the receiving section is turned off, and the intermittent receiving operation is continued.

The difference between Ton1 according to the present invention and Ton according to the prior art (FIG. 10) is as follows. Ton-Ton1 = (Tp + Ta + 2Tf + Tuw + Tpm + Tr)-(Tp + 3Tpm + Tf + Tr) (13) = Ta + Tw + Tf-2Tpm (14) Here, Tuw and T are usually used because Ta is a very short time.
When pm is sufficiently smaller than Tf, the time for turning on the receiving unit power supply 9 in one intermittent reception operation is substantially shorter than Tf in the related art.

Furthermore, by further subdividing the power interruption control during the intermittent reception operation in the present embodiment, the power consumption of the receiving section can be further reduced.

For example, when the power of the receiving unit shown in FIG. 2C is turned on, only the power of the demodulating means 2, the UW detecting means 3, the frame synchronizing means 4 and the storing means 5 is turned on, and the phase ambiguity removing means 6 is turned on when UW is detected. , The Viterbi decoding means 7 is turned on.

On the other hand, as soon as the demodulated signal of the frame addressed to the own station is completely stored in the storage means 5, the power of the demodulation means 2 and the UW detection means 3 is cut off. , The remaining frame synchronization means 4, storage means 5,
The power of the phase ambiguity removing unit 6 and the Viterbi decoding unit 7 is controlled to be turned off.

As a result, during the intermittent reception operation, the power supply for the portion not required for receiving the frame addressed to the own station is cut off, and the power consumption can be reduced.

As described above, in the first embodiment of the present invention, the radio frame does not include the FB, and the receiving unit power supply 9 is turned on in the middle of the immediately preceding frame during the intermittent reception operation. Even if the control is performed, the frame addressed to the own station can be properly decoded by effectively utilizing the demodulated signal stored in the storage unit 5. (Second Embodiment of the Invention) Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a block diagram of an intermittent receiving apparatus according to the second embodiment of the present invention. 3, the same components as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 3, the configuration of the storage means 5, the phase ambiguity removing means 6 and the Viterbi decoding means 7 of FIG. 1 is replaced by n-phase data generating means 11, n Viterbi decoding means 7 and selecting means 12 Accordingly, the control means 13, the receiving section power supply 14, and the time measuring means 15 are different.

That is, the demodulation means 2 is connected to the UW detection means 3 and the n-phase data generation means 11 (where n is the number of phases of the polyphase modulation). n-phase data generating means 1
1 is connected to n Viterbi decoding means 7. The n Viterbi decoding means 7 are connected to a selection means 12 for inputting, selecting and outputting the output signal of each Viterbi decoding means. An output terminal for passing an output signal to a subsequent audio signal processing unit and a control unit 13 are connected to the selection unit 12.
The control unit 13 is connected to a receiving unit power supply 14 and a timing unit 15.

On the other hand, the frame synchronizing means 4 is connected to n-phase data generating means 11, n Viterbi decoding means 7, and selecting means 12.

The demodulation means 2, the UW detection means 3, the frame synchronization means 4, the n-phase data generation means 11, the n Viterbi decoding means 7, and the selection means 12 are connected to the reception unit power supply 14, and the control means are respectively provided. Power is supplied under the control of T.13. The receiving unit power supply 14 includes a demodulation unit 2, a UW detection unit 3, a frame synchronization unit 4, an n-phase data generation unit
The power supply to the 1, n Viterbi decoding means 7 and the selection means 12 is turned on / off by using a semiconductor switch element such as an FET (power MOSFET). The semiconductor switch element may be independently provided as a configuration provided individually for each means.

Next, the intermittent receiving operation of the intermittent receiving apparatus of FIG. 3 will be described with reference to FIG. FIG. 4A shows the demodulated signal 301 in FIG. 3, and the bold line indicates a frame addressed to the own station. Tn indicates the time from when a frame addressed to the own station is received until when a frame addressed to the next own station is received. (B) shows the operation of the receiving unit, and (b-1) to (b-)
3) indicates the input operation and output operation of the n Viterbi decoding means 7 and the output data of the selection means 12, respectively. (C) shows the operation of the receiving unit power supply 14, and Ti shows the time from turning off the receiving unit power supply 14 to turning on the receiving unit power supply 14 to receive the next frame addressed to the own station. I have.

FIG. 4 shows the operation of the intermittent receiving apparatus for receiving a frame addressed to the own station once during the intermittent receiving operation. Therefore, the operation from the power-on of the terminal station to the start of the intermittent receiving operation will be described. Is explained including supplementary information.

When the power of the terminal station is turned on, the control means 13 turns on the power supply 14 of the receiving section. When the receiving unit power supply 14 is turned on,
Demodulation means 2 establishes synchronization. Let Tp be the time required to establish synchronization from the power-on of the receiver power supply 14 ((c) and (b)).

When the demodulation means 2 establishes synchronization, the n-phase data generation means 11 generates a data sequence of the number of possible phase ambiguities (= n) from the demodulated signal 301, and the corresponding n Viterbi decoding means 7 to start the decoding process (b-1).

For example, in a system of the QPSK phase modulation system, four types of data sequences are generated, and four Viterbi decoding means 7 are provided to perform decoding processing respectively. In this case, n
The phase data generation means 11 will be described with reference to FIGS.

FIG. 5 is a block diagram showing the structure of the n-phase data generating means. “a” and “b” represent orthogonal components of the input demodulated signal 301, and two-complement generation units 11-1 and 11-2 for generating two's complements of “a” and “b” are connected to each input terminal.

Further, I and Q of # 1 to # 4 represent four kinds of demodulated data sequence output signals considered from the phase ambiguity of the input signal, and are configured to output necessary signals. Each of I and Q is input to Viterbi demodulation means 7 of four types.

The n-phase data generating means 11 outputs the demodulated signal 3
From 01, n (four) data sequences are generated and output according to the possible phase ambiguity. “a” and “b” are multi-valued data by soft decision, and the values are positive and negative and are represented by 2's complement. Assuming that a has a phase relationship advanced by π / 2 with respect to b, the orthogonal coordinate axes of a and b can take the four cases shown in FIG. 9A depending on the phase ambiguity of the demodulated signal 301. . I and Q in each case are obtained by the conversion formulas shown in the table of FIG.

[0128] The n-phase data generating means 11 is shown in FIG.
Are generated and output. Therefore n
The phase data generating means 11 includes two's complement generating means 11-
1 and 11-2, and are configured to output a, b, -a, and -b to four sets of I and Q output terminals corresponding to FIG. 9B. In this way, the n-phase data generating means 11 generates and outputs n (four) possible data sequences from the demodulated signal 301.

Returning to FIGS. 3 and 4, on the other hand, the UW detection means 3 starts the UW detection operation when the demodulation means 2 establishes synchronization, and notifies the frame synchronization means 4 of the phase discrimination information 302 when UW is detected. I do.

The frame synchronization means 4 establishes frame synchronization based on the notification from the UW detection means 3, performs processing such as synchronization protection, and transmits frame synchronization information 303 to the demodulation means 2 in order to stably maintain the synchronization. In this way, the demodulation means 2 performs control such that the loop band is appropriately selected and the like so that the signal can be stably received.

When the frame synchronization is established, the frame synchronization means 4 controls the selection means 12 based on the phase discrimination information 302 from the UW detection means 3 so as to select a data sequence having a correct phase out of n (304). Selection means 12
Selects and outputs the Viterbi decoding means 7 of the data sequence having the correct phase (b-3).

The output of the Viterbi decoding means 7 converges by decoding the input at Tpm or more. Since the frame in which UW is detected is continuously input thereto, it is properly decoded and output.

Further, according to the power-on timing of the terminal station,
If a demodulated signal of Tpm or more cannot be secured before the input of a frame in which UW is detected, proper decoded data cannot be obtained because the Viterbi decoding means 7 does not sufficiently converge. In this case, the control unit 13 continues the operation of the receiving unit 113,
The following checks are started from the appropriate decoded data obtained in the next frame.

The control means 13 inputs the decoded data 305 and checks the FD of each received frame until a frame addressed to the own station is detected.

When a frame addressed to the own station is detected, the call information is checked. When the call information is detected, a response operation is started.

When no call information is detected, FN and NF
N, the time Ti until the next reception operation starts
2 is calculated. This is set in the timer means 15, the power supply 14 of the receiving section is cut off, and the operation shifts to the intermittent receiving operation (c).

Ti2 is calculated by the following equation. Ti2 = Tn-Ton2 (15) Ton2 = Tp + Tpm + Tf + Tuw + Tpm + Tr (16) = Tp + 2Tpm + Tf + Tw + Tr (17) In the present embodiment, the value of Ti2 is the F of the radio frame.
Although the calculation is performed based on the FN and NFN included in D, the present invention is not limited to this method. For example, Ti2 may be included in a radio frame.
2 may be a fixed value depending on the system.

After the transition to the intermittent reception operation, when the time Ti2 has elapsed, the timer 15 notifies the controller 13 and the controller 13 turns on the power supply 14 of the receiver. The turning-on timing of the receiving unit power supply 14 at this time is as shown in FIG. When the receiving unit power supply 14 is turned on, the receiving unit performs an intermittent receiving operation.

That is, demodulation means 2 establishes synchronization again and outputs demodulated signal 301. Let Tp be the time from turning on of the receiver power supply 14 to establishment of synchronization ((c) and (b)).

When the demodulation unit 2 establishes synchronization, the frame synchronization unit 4 controls the n-phase data generation unit 11 to generate n-sequence data, controls the Viterbi decoding unit 7 to a known state, and performs a decoding operation. Start (b-2).

On the other hand, the UW detection means 3 starts the UW detection operation when the demodulation means 2 establishes synchronization, and notifies the frame synchronization means 4 of the phase discrimination information 304 when detecting the UW.

The frame synchronization means 4 establishes frame synchronization in response to the notification from the UW detection means 3. Thereafter, the synchronization is maintained in the same manner as when the power of the terminal station is turned on, and the selection means 12 is controlled by the phase determination information 302 from the UW detection means 3 (304). The selecting means 12 selects and outputs the Viterbi decoding means 7 of the data sequence having the correct phase.

The output of the Viterbi decoding means 7 converges by decoding the part at the end of the immediately preceding frame which is equal to or longer than Tpm, and thus the Viterbi decoding means 7 properly decodes the continuously inputted frames addressed to the own station. The Viterbi decoding unit 7 outputs the head data of the frame addressed to the own station Tr after the FN of the frame addressed to the own station is input, and outputs the data of the frame addressed to the own station after Tr when the data of Tpm is input from the head of the FN of the immediately following frame. The end data is output, and the decoding process is completed (b-3).

The control means 13 inputs the decoded data 305, and when the decoding means 7 completes the decoding processing of the frame addressed to the own station, the control means 13 checks the call information and, upon detecting the call information, enters a response operation.

If there is no call information, the next Ti2 is calculated from the FN and NFN, set in the timekeeping means 15, and
4 and the intermittent reception operation is continued.

The Ton2 according to the present invention and the prior art (FIG. 1)
The difference from Ton according to 0) is as follows. Ton-Ton2 = (Tp + Ta + 2Tf + Tuw + Tpm + Tr)-(Tp + 2Tpm + Tf + Tuw + Tr) (18) = Ta + Tf-Tpm (19) Here, since Ta is usually a very short time, Tpm is Tf.
In this case, the time for turning on the receiving unit power supply 14 in one intermittent reception operation is substantially shorter than that of the conventional technique by Tf.

Further, by further subdividing the power interruption control at the time of the intermittent reception operation in the present embodiment, it is possible to further reduce the power consumption of the receiving section.

For example, at the time of turning on the power of the receiving section in FIG. 4C, the power of only the demodulating means 2, the UW detecting means 3, the frame synchronizing means 4, the n-phase data generating means 11, and the n Viterbi decoding means 7 is turned on. , Is controlled to turn on the power of the selection means 12 when UW is detected.

On the other hand, after detecting the UW and controlling the selection means 12 to select the Viterbi decoding means 7 having the correct phase, the power supply of the Viterbi decoding means 7 not selected is turned off. Further, as soon as the demodulated signal of the immediately following frame from the FN head to Tpm is input to the Viterbi decoding means 7, the power supplies of the demodulating means 2, the UW detecting means 3 and the n-phase data generating means 11 are cut off, and FIG. When the power of the receiving unit is turned off, control is performed so as to turn off the power of the remaining frame synchronization means 4, the Viterbi decoding means 7 selected by the selection means 12, and the selection means 12.

As a result, during the intermittent reception operation, the power of a portion not necessary for receiving the frame addressed to the own station is cut off, and the power consumption can be reduced.

As described above, in the second embodiment of the present invention, the radio frame does not include the FB, and the control is performed such that the power supply 14 is turned on in the middle of the immediately preceding frame during the intermittent reception operation. Even so, an appropriate decoded output can be obtained.

As described above, according to the present invention,
In the intermittent receiving device that performs the intermittent receiving operation during the standby operation, since the radio frame does not include the redundant bits such as the FB, an effect that higher transmission efficiency can be secured can be obtained.

Further, according to the present invention, the power-on time of the receiving section for receiving a frame addressed to the own station at the time of intermittent reception can be reduced to approximately half that of the conventional intermittent receiving apparatus, and the standby operation time can be reduced. It has the effect of being able to extend about twice.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a receiving unit of a terminal according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of a receiving unit of a terminal according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a receiving unit of a terminal according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of an operation of a receiving unit of a terminal according to a second embodiment of the present invention.

FIG. 5 is a block diagram illustrating a configuration of an n-phase data generation unit according to the second embodiment of this invention.

FIG. 6 is a diagram illustrating a configuration of a conventional wireless communication system and a configuration of a wireless frame.

FIG. 7 is a block diagram illustrating a configuration of a terminal station in a conventional wireless communication system.

FIG. 8 is an explanatory diagram of an intermittent reception operation of a terminal station in a conventional wireless communication system.

FIG. 9 is an explanatory diagram of a phase ambiguity removing unit of the conventional intermittent receiving device.

FIG. 10 is an explanatory diagram of an intermittent reception operation of a terminal station when an FB is deleted in a conventional wireless communication system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving means 2 Demodulation means 3 UW detection means 4 Frame synchronization means 5 Storage means 6 Phase ambiguity removal means 7 Viterbi decoding means 8 Control means 9 Receiving part power supply 10 Clocking means 11 n Phase data generation means 12 Selection means 13 Control means 14 Receiver power supply 15 Clocking means 101 Demodulated signal 102 Phase determination information 103 Frame synchronization information 104 Control signal 105 Decoded data 111 Antenna 112 Transmitter 113 Receiver 114 Audio signal processor 115 Intermittent receiver 301 Demodulated signal 302 Phase determination information 303 Frame synchronization Information 304 control signal 305 decoded data

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 5K004 AA05 FA05 FB01 FD05 FG01 FH08 FH09 5K034 AA03 AA15 FF05 HH02 HH09 HH26 PP07 TT06 5K047 BB01 BB11 EE02 HH01 HH11 HH44 MM12 MM13 MM13 MM14 MM14 MM14 MM14 DD

Claims (33)

[Claims] In an intermittent receiving apparatus for intermittently receiving a radio frame including a unique word (UW), a demodulation means of a synchronous detection system, and a UW detecting the UW from an output signal (demodulation signal) of the demodulation means. Detecting means, accumulating means for sequentially accumulating the demodulated signal, and sequentially outputting after detecting the UW, and at least after receiving a radio frame to be received, at least the demodulating means, the UW detecting means, and the accumulating means Control means for turning off the power of the receiving unit and controlling the power of the receiving unit to be turned on after a predetermined period of time. 2. The receiving section according to claim 1, wherein said receiving section includes at least phase ambiguity removing means for removing a phase ambiguity of an output signal of said storage means, and Viterbi decoding means for decoding and outputting an output signal of said phase ambiguity removing means. The UW detection means controls the phase ambiguity removal means so as to determine the phase of the demodulated signal at the time of UW detection and to appropriately remove the phase ambiguity, thereby detecting the phase ambiguity of the output signal of the accumulation means. The control means removes, after receiving a radio frame to be received, at least the demodulation means, the UW detection means, the storage means, the phase ambiguity removal means, and the Viterbi decoding means 2. The intermittent receiving device according to claim 1, wherein the control unit controls to turn off the power supply of the receiving unit including the following, and to turn on the power supply of the receiving unit after a predetermined time. 3. A power supply interrupting means, wherein at least the demodulation means, the UW detection means, the storage means, the phase ambiguity elimination means, and the Viterbi decoding means included in the reception section each individually interrupt the power supply. 3. The intermittent reception apparatus according to claim 1, wherein the control unit is configured to individually control the power supply and disconnection unit so as to switch off and on the power supply of the reception unit. apparatus. 4. The intermittent receiving device according to claim 3, wherein said power supply intermittent means comprises a semiconductor switch such as an FET. 5. The storage means comprises a semiconductor storage element such as a memory element, a shift register element, and a FIFO memory element, and stores and outputs an output signal of the demodulation means.
The intermittent receiving device according to claim 1. 6. The intermittent receiving apparatus according to claim 1, wherein said control means has a time measuring means for returning a notification after an elapse of the set time when an arbitrary time is set. 7. The control means receives the decoded data output from the Viterbi decoding means, receives the predetermined time included in the radio frame, and notifies the control unit of the predetermined time obtained from the radio frame. 7. The intermittent receiving device according to claim 1, wherein the intermittent receiving device is set as a timer, and the power of the receiver is turned off, and the power of the receiver is turned on in response to a notification from the timer. 8. The control means, wherein the radio frame includes destination terminal station identification information of the radio frame, identification information of the radio frame, and identification information of a radio frame to be transmitted to the same terminal station next. Refers to the destination terminal station identification information of the wireless frame, detects a wireless frame addressed to the own station (frame addressed to the own station), and transmits the identification information of the wireless frame and the next addressed to the same terminal station. The time until the next frame addressed to the own station is transmitted with reference to the identification information of the wireless frame to be transmitted, and the time is set as the predetermined time in the timing means, and the power of the receiving unit is turned off. 8. The intermittent receiving apparatus according to claim 7, wherein after the predetermined time has elapsed, the power of the receiving unit is turned on in response to a notification from the timing unit. 9. The intermittent receiving apparatus according to claim 7, wherein said control means subtracts a predetermined time from said predetermined time and sets said time in said time measuring means. 10. The predetermined time may be a time required for the demodulating means to establish synchronization after turning on the power of the receiving unit, and a time not less than three times a code transition path memory length of the demodulating means. And a decoding processing time of the Viterbi decoding means. 11. An intermittent receiving method for intermittently receiving a radio frame including a UW, wherein the demodulated signal is sequentially stored in a storage means, and after the UW is detected, the signal is sequentially output and received. An intermittent reception method, comprising: after receiving a radio frame, turning off the power of a receiving unit including at least a demodulating unit, a UW detecting unit, and the storing unit, and turning on the power of the receiving unit after a predetermined time. 12. The receiving unit includes at least a phase ambiguity removing unit and a Viterbi decoding unit, and determines a phase of a demodulated signal at the time of detecting the UW to properly adjust a phase ambiguity of an output signal of the storage unit. After receiving and receiving the radio frame to be received, at least the demodulating unit, the UW detecting unit, the storing unit, the phase ambiguity removing unit, and the receiving unit including the Viterbi decoding unit 12. The intermittent receiving method according to claim 11, wherein the power is turned off and the power of the receiving unit is turned on after a predetermined time. 13. A power supply interrupting means, wherein at least the demodulation means, the UW detection means, the storage means, the phase ambiguity removal means, and the Viterbi decoding means included in the reception section each independently interrupt the power supply. 13. The intermittent reception method according to claim 11, further comprising the steps of: turning on and off the power of the receiving unit by individually turning on and off the power supply switching unit. 14. The predetermined time is notified by being included in the radio frame, and after receiving the radio frame to be received, the power of the receiving unit is turned off, and after the predetermined time has elapsed, the power of the receiving unit is turned off. 14. The intermittent receiving method according to claim 11, wherein the receiving is performed. 15. The control means, wherein the radio frame includes destination terminal station identification information of the radio frame, identification information of the radio frame, and identification information of a radio frame to be transmitted next to the same terminal station. Detects a frame addressed to the own station with reference to the destination terminal station identification information of the wireless frame, and identifies the identification information of the wireless frame and the identification information of the wireless frame to be transmitted next to the same terminal station. Calculate the time until the next transmission of the frame addressed to the own station with reference to this, and turn off the power of the receiving unit as the predetermined time, and turn on the power of the receiving unit after the lapse of the predetermined time. The intermittent reception method according to claim 11, wherein: 16. The intermittent reception method according to claim 14, wherein an arbitrary time determined in advance is subtracted from the predetermined time and the time is set in the timer. 17. The predetermined arbitrary time includes a time required for the demodulating means to establish synchronization after turning on the power of the receiving unit, and a time not less than three times a code transition path memory length of the demodulating means. 17. The receiving method according to claim 16, wherein the sum is the sum of the decoding processing time of said Viterbi decoding means. 18. An intermittent receiving apparatus for intermittently receiving a radio frame including UW, comprising: a demodulation means of a synchronous detection system;
UW detecting means for detecting the demodulated signal, and n-phase data generating means for generating and outputting demodulated data from the demodulated signal based on n phases of the demodulated signal (where n is the number of modulation phases in the polyphase modulation). After receiving a radio frame to be received, the power of a receiving unit including at least the demodulating unit, the UW detecting unit, and the n-phase data generating unit is turned off, and after a predetermined time, the power of the receiving unit is turned on. Control means for controlling the intermittent receiving apparatus. 19. A plurality of Viterbi decoding means, comprising: a plurality of Viterbi decoding means for inputting, decoding, and outputting demodulated data having at least n phases output from the n-phase data generating means; and a plurality of Viterbi decoding means. Selecting means for selecting and outputting an output of the Viterbi decoding means, wherein the UW detecting means determines the phase of the demodulated signal at the time of UW detection, and selects the output of the Viterbi decoding means having an appropriate phase out of n ways. Control means, the selection means selects and outputs the output of the Viterbi decoding means having an appropriate phase, and the control means, after receiving the radio frame to be received, at least the demodulation means, the U
The power of a receiving unit including the W detecting unit, the n-phase data generating unit, the plurality of Viterbi decoding units, and the selecting unit is turned off, and the power of the receiving unit is turned on after a predetermined time. The intermittent receiving device according to claim 18, wherein: 20. At least the demodulation unit, the UW detection unit, the n-phase data generation unit, the plurality of Viterbi decoding units, and the selection unit included in the reception unit,
The power supply interrupting means for individually interrupting the power supply, the control unit individually controls the power interrupting means,
20. The intermittent receiving device according to claim 18, wherein the power of the receiving unit is turned off and on. 21. The power supply connection / disconnection means comprises a semiconductor switch such as an FET.
21. The intermittent receiver according to any one of claims 20 to 20. 22. The intermittent receiving apparatus according to claim 18, wherein said control means has a time measuring means for returning a notification after an elapse of the set time when an arbitrary time is set. 23. The control means receives the decoded data output from the selection means, receives the predetermined time in the radio frame, and notifies the control unit of the predetermined time obtained from the radio frame. 23. The intermittent receiving apparatus according to claim 18, wherein the intermittent receiving apparatus is configured to turn off the power of the receiving unit by setting the receiving unit and turn on the power of the receiving unit in response to the notification from the timing unit. 24. The control means, wherein the radio frame includes destination terminal station identification information of the radio frame, identification information of the radio frame, and identification information of a radio frame to be transmitted to the same terminal station next. Detects a frame addressed to the own station with reference to the destination terminal station identification information of the wireless frame, and identifies the identification information of the wireless frame and the identification information of the wireless frame to be transmitted next to the same terminal station. Calculate the time until the next frame addressed to the own station is transmitted by reference, set this as the predetermined time in the timing means and turn off the power of the receiving unit, after the predetermined time has elapsed, 24. The intermittent receiving device according to claim 23, wherein the power of the receiving unit is turned on in response to the notification from the timing unit. 25. The control device according to claim 25, wherein:
25. The intermittent receiving apparatus according to claim 23, wherein an arbitrary time set in advance is subtracted and the time is set in the timer. 26. The predetermined arbitrary time includes a time required for the demodulation means to establish synchronization after turning on the power of the receiving unit, and a time which is at least twice as long as a code transition path memory length of the demodulation means. 26. The receiving apparatus for a wireless communication system according to claim 25, wherein the sum is the sum of the time of the UW length and the decoding processing time of the Viterbi decoding unit. 27. An intermittent receiving method for intermittently receiving a radio frame including UW, wherein the n-phase data generating means generates n kinds of demodulated signals (where n is the modulation phase of the polyphase modulation). After the reception of the radio frame to be received, the power of the receiving unit including at least the demodulation means, the UW detection means, and the n-phase data generation means is cut off, The intermittent receiving method, characterized in that the power of the receiving unit is turned on after the time of (i). 28. The receiving section includes at least a plurality of Viterbi decoding means and a selecting means, and inputs demodulated data in n different phases output from the n-phase data generating means to the plurality of Viterbi decoding means. The UW
Discriminating the phase of the demodulated signal at the time of detection, selecting and outputting the output of the Viterbi decoding means having a correct phase among a plurality,
After receiving a radio frame to be received, at least the demodulation unit, the UW detection unit, the n-phase data generation unit,
28. The intermittent reception method according to claim 27, wherein a power supply of a reception unit including the plurality of Viterbi decoding units and the selection unit is turned off, and after a predetermined time, the power supply of the reception unit is turned on. 29. An arbitrary Viterbi which is not selected by said selection means after selecting and outputting an output of said Viterbi decoding means having a correct phase among said plurality of Viterbi decoding means by said selection means upon detecting said UW. 29. The intermittent reception method according to claim 28, wherein a power supply of the decoding unit is turned off. 30. The predetermined time is notified by being included in the radio frame, and after receiving the radio frame to be received, the power of the receiving unit is turned off, and after the predetermined time has elapsed, the power of the receiving unit is turned off. 30. The intermittent reception method according to claim 27, wherein the reception is performed. 31. The control means, wherein the radio frame includes destination terminal station identification information of the radio frame, identification information of the radio frame, and identification information of a radio frame to be transmitted next to the same terminal station. Detects a frame addressed to the own station with reference to the destination terminal station identification information of the wireless frame, and identifies the identification information of the wireless frame and the identification information of the wireless frame to be transmitted next to the same terminal station. Calculate the time until the next frame addressed to the own station by referring to the power, turn off the power of the receiving unit as the predetermined time, and turn on the power of the receiving unit after the predetermined time has elapsed. 31. The intermittent reception method according to claim 27, further comprising: 32. The intermittent reception method according to claim 30, wherein an arbitrary time set in advance is subtracted from said predetermined time and set in said timer means. 33. The predetermined time includes a time required for the demodulation means to establish synchronization after turning on the power of the receiving unit, and a time which is at least twice the code transition path memory length of the demodulation means. 33. The receiving method according to claim 32, wherein the sum is a sum of the time of the UW length and the decoding processing time of the Viterbi decoding unit.