JP3075983B2 - Receiver with adaptive antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving apparatus with an adaptive antenna, and more particularly to a receiving apparatus with an adaptive antenna capable of improving reception performance by using a plurality of adaptive antenna control algorithms in combination or switching as necessary. Related to the device.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing a configuration of a conventional receiving device with an adaptive antenna having n antennas, and FIG. 5 is an explanatory diagram showing a general data format shown in time series. In FIG. 4, 401-1 to 40-1
1-n are n receiving antenna units. 402-1-4
02-n denotes n first-stage amplifiers for amplifying weak reception waves. Reference numerals 403-1 to 403-n denote n frequency conversion units for converting a received signal into an IF signal band. 404-1 to 4
04-n are n quadrature detectors for extracting the I signal and the Q signal from the received signal in the IF frequency band. 405-1 to 40
5-n, 406-1 to 406-n denote n A / As for digitally converting the I signal and the Q signal obtained by the quadrature detection.
It is a D conversion unit.

[0003] Reference numeral 407 denotes n reception antenna units 401-1.
This is an adaptive antenna processing unit that performs adaptive antenna processing on received signals received by ４０１401-n to remove distortion. Reference numeral 408 denotes a frame synchronization acquisition / maintenance unit that detects a frame timing from the received signal and keeps the detected frame timing from shifting.
Reference numeral 409 denotes a decoding unit that converts a reception signal on which the adaptive antenna processing has been performed into reception data. In the processing after 407, for example, an A / D converted signal can be read into a DSP (Digital Signal Processor) and subjected to program processing.

In FIG. 5, 501-m to 501-m +
Reference numeral 2 denotes a frame composed of information data, control data, a unique word, a training sequence, and the like. 502-m to 502-m + 2 are unique words, training sequences, etc., which are control data inserted between information data to be transmitted. 5
03-m to 503-m + 2 are information data to be transmitted divided by control data.

Next, the operation of the above conventional example will be described. First, radio waves are received by n reception antenna units 401-1 to 401-n having different spatial positions, and a received signal is supplied to a first-stage amplification unit 402-1 for each reception antenna.
402-n, the signal is amplified to a signal level that is easy to handle. The amplified reception signal is transmitted to frequency conversion units 403-1 to 403-1.
The signal is converted into an IF signal band by 403-n, quadrature detected by quadrature detectors 404-1 to 404-n for each antenna, converted into an I signal (in-phase component) and a Q signal (quadrature component), and A / D converted. Parts 405-1 to 405-n, 406-
It is converted into a digital signal by 1-406-n.

[0006] The adaptive antenna processing unit 407 converts known signals 502-m to 502-m + 2, such as a unique word and a training sequence, which are control data inserted between information data to be transmitted, and a received signal. By performing the comparison, adaptive antenna signal processing for controlling the reception characteristics is performed, the distortion component included in the reception signal is removed, and the reception performance is improved. Such an adaptive antenna signal processing method is described in, for example, Kazuaki Takao: “Adaptive Antenna Theory System”, IEICE (B-II), Vol.
5-B-II, No. 11, pp. 713-720 (published November 1992), or Yasutaka Ogawa, Nobuyoshi Kikuma: "Progress and Future Prospects of Adaptive Antenna Theory," IEICE (B-II) , Vol.J75-BI
I, No. 11, pp. 721-732 (issued in November 1992).

[0007] The frame synchronization acquisition and maintenance unit 408 calculates a unique word, a training sequence or the like from the output signal of the adaptive antenna processing unit 407.
Using the fact that m + 2 is also known on the receiving side, the time position of frames 501-m to 501-m + 2 is detected, and correction is performed so that the correct frame timing is always maintained after detection. . Based on the frame timing, adaptive antenna processing section 407 controls adaptive signal processing, and decoding section 409 decodes the received signal on which the adaptive antenna processing has been performed into received data. Although not shown, when a detection method that requires clock recovery is used, clock recovery is performed from a signal similar to that of the frame synchronization acquisition and maintenance unit 408, and the recovered clock is processed by adaptive antenna processing and frame synchronization acquisition and maintenance. Used for processing and decoding.

[0008]

In the receiving apparatus with an adaptive antenna according to the prior art, as a guiding principle of the adaptive antenna, an adaptive signal for determining characteristics of the adaptive antenna by comparing known data such as a training sequence with received data. LMS to process (L
Since east mean square error) is used, information on the time position where known data exists is required.

However, the frame synchronization acquisition / maintenance unit for detecting the time position obtains the time position (frame synchronization) based on the output signal of the adaptive antenna processing unit. The control data for determining the time position is made less susceptible to fading and multipath propagation paths than the information data, but it is necessary to increase the number of control data to make it less susceptible to this effect. is there. However, considering the ratio of control data and information data in transmitted information (transmission efficiency), there is a limit to increasing the number of control data.
When the effect of fading or multipath propagation is large, frame synchronization cannot be obtained, and there is a problem that adaptive antenna processing cannot be performed. Also,
Without acquiring frame synchronization, adaptive antenna processing can be performed assuming that all received data is control data. In this case, for example, when processing is performed by a DSP (digital signal processor), the amount of adaptive antenna processing is reduced. Has become enormous, and it has been difficult to realize.

On the other hand, a CPM (Contrast) that performs adaptive signal processing for determining characteristics of an adaptive antenna without comparing known data such as a training sequence with received data.
strained Power Minimization) or CMA (Constant M
odulus algorithm), the adaptive antenna processing performance does not depend on the frame synchronization detection accuracy, but the adaptive antenna processing suppresses the effects of fading and the effects of multipath propagation paths. There is a problem that it is inferior to that of LMS or the like that performs adaptive signal processing by comparing the received data with the received data. In addition, when a detection method that requires clock recovery is used, there is a problem similar to that of maintaining frame synchronization.

An object of the present invention is to solve the above-mentioned problems of the prior art, and comprises a plurality of kinds of adaptive antenna control algorithm executing means, and means for controlling the operation of the algorithm executing means. Another object of the present invention is to provide a receiving device with an adaptive antenna, which can improve reception performance by using the adaptive antenna control algorithm in combination or by switching. In addition, when a detection method that requires clock recovery is used, the object is to perform stable clock recovery.

[0012]

In order to achieve the above object, the present invention relates to a receiving apparatus with an adaptive antenna having a plurality of antennas, wherein a plurality of adaptive antenna processing means for executing adaptive antenna control algorithms of different systems are provided. And a plurality of adaptive antenna processing means or an algorithm combination / switching means for switching.

According to the present invention, with the above-described configuration, for example, even when the influence of fading or multipath propagation is great and it is difficult to obtain the frame synchronization time position, the known data can be added to the preprocessing of the frame synchronization acquisition means. By adopting adaptive antenna processing means for determining the characteristics of the adaptive antenna and performing adaptive signal processing without comparing with the received data, the frame synchronization required to know the time position where known data exists is adopted. Timing is obtained stably. Then, as pre-processing for decoding received data, frame synchronization information is indispensable, and adaptive antenna processing using an LMS or the like having a greater effect of suppressing unnecessary waves can be performed.

Therefore, as compared with the case of using the conventional single adaptive antenna processing method, it is possible to more strongly suppress the effects of fading and multipath propagation paths, to suppress the influence more stably, and to improve the reception performance. Become. In addition, when a detection method that requires clock recovery is used, clock recovery can be performed stably even when fading or a multipath propagation path has a large effect, as in the frame synchronization acquisition and maintenance unit.

[0015]

Embodiments of the present invention will be described below in detail. In the first embodiment, a plurality of detecting means in which a receiving antenna unit, a first-stage amplifying unit, a frequency converting unit, a quadrature detecting unit, and an A / D converting unit are sequentially connected; known data such as CPM or CMA; Adaptive antenna processing means for performing adaptive signal processing to determine the characteristics of the adaptive antenna without comparing with the adaptive antenna processing means, based on the output of the adaptive antenna processing means to detect the reception time position, frame synchronization acquisition and maintenance means for maintaining Is provided.

Further, based on the frame timing obtained by the frame synchronization obtaining and maintaining means, adaptive antenna processing for performing adaptive signal processing for determining characteristics of the adaptive antenna by comparing known data such as LMS with received data. And decoding means for decoding the output signal of the processing means and converting it into received data. When a detection method that requires clock recovery is used, a clock recovery unit that recovers the clock from the same signal as the frame synchronization acquisition and maintenance unit is also provided.

An adaptive signal processing method such as CPM or CMA that determines the characteristics of an adaptive antenna without comparing known data such as a training sequence with received data, or a known method such as LMS. An adaptive signal processing method for comparing data with received data and determining characteristics of an adaptive antenna is well known, for example, as described in the above-mentioned prior art document.

According to the present invention, a stable frame synchronization time position can be obtained even when it is difficult to obtain frame synchronization due to the influence of fading and multipath propagation paths, and the time when known data exists in the received signal can be obtained. Adaptive antenna processing such as LMS that requires position information can be used, and the effect of fading and multipath propagation can be more strongly and more stably suppressed.

FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. FIG. 1 shows a configuration for realizing a receiving apparatus with an adaptive antenna having n antennas according to the present invention.
The configuration up to the D conversion unit 106-n is the same as the conventional example shown in FIG. 107 performs adaptive antenna processing using a method such as CPM or CMA that performs adaptive signal processing for determining characteristics of the adaptive antenna without comparing known data with received data, and performs distortion due to fading and multipath propagation paths. Is an adaptive antenna processing unit A that removes Reference numeral 109 denotes a frame synchronization acquisition / maintenance unit that detects a frame timing time position from the output signal of the adaptive antenna processing unit A, and keeps the detected frame timing from shifting.

Reference numeral 108 denotes an adaptive antenna process using an LMS or the like which performs adaptive signal processing for comparing the known data with the received data to determine the characteristics of the adaptive antenna at the frame timing obtained by the frame synchronization acquisition and maintenance unit. And an adaptive antenna processing unit B for removing distortion due to fading and multipath propagation. 11
Reference numeral 0 denotes a decoding unit that converts a reception signal that has been subjected to adaptive antenna processing in the adaptive antenna processing unit B into reception data. When a detection method that requires clock recovery not shown in the figure is used, clock recovery is performed from the same signal as the frame synchronization acquisition and maintenance unit, and the recovered clock is subjected to adaptive antenna processing, frame synchronization acquisition and maintenance processing, A clock recovery unit that supplies the data to the decoding process is provided.

Next, the operation of the first embodiment will be described. Here, the guiding principle of the adaptive antenna processing unit A107 is CMA, and the adaptive antenna processing unit B108
Here is an example of the case where LMS is used for the teaching principle of the above. First, n reception antenna units 101-1 having different spatial positions are used.
Radio waves are received by 1 to 101-n, and the received signal is amplified to a signal level that can be easily handled by an electronic circuit by first-stage amplifiers 102-1 to 102-n for each receiving antenna. The amplified reception signals are transmitted to frequency conversion units 103-1 to 103-1.
-N, the signal is converted into an IF signal band, and quadrature detection units 104-1 to 104-n perform quadrature detection for each antenna and convert them into an I signal (in-phase component) and a Q signal (quadrature component).
A / D converters 105-1 to 105-n, 106-1 to 1
06-n is converted to a digital signal.

The adaptive antenna processing unit A107 includes:
Adaptive signal processing is performed so that the envelope at the sample points required for decoding the received signal is constant, and the I and Q signals of each antenna are combined so as to suppress the effects of fading and multipath propagation. Output. The frame synchronization acquisition and maintenance unit 109 includes an adaptive antenna processing unit A10
7 from the output signal of frame 501-m to 501-m + 2
Is detected, and the timing is corrected so that the correct frame synchronization timing is always maintained after the detection.

The adaptive antenna processing unit B108
Based on the detected frame timing, a unique word that is a known signal, a training sequence, etc.
An adaptive antenna signal process for controlling reception characteristics by comparing m to 502-m + 2 with the received signal is performed, and fading and distortion components due to a multipath propagation path included in the received signal are removed and output. Decoding section 109 decodes the output signal of adaptive antenna processing section B into received data. When a detection method that requires clock recovery is used, clock recovery is performed from the same signal as that of the frame synchronization acquisition and maintenance unit, and the recovered clock is used for adaptive antenna processing, frame synchronization acquisition and maintenance processing, and decoding processing.

Next, a second embodiment will be described. In this embodiment, adaptive antenna processing means A for performing adaptive signal processing for determining characteristics of an adaptive antenna without performing comparison between known data and received data, such as CPM or CMA, and an output of the adaptive antenna processing means A And a unique word detecting means A for detecting the reception time position of the known signal based on the

Further, based on the frame timing obtained by the frame synchronization obtaining and maintaining means, an LMS or the like
Adaptive antenna processing means B for comparing the known data with the received data, performing adaptive signal processing for determining characteristics of the adaptive antenna, and removing distortion of the received signal
Based on the output of the adaptive antenna processing means B, a unique word detection means B for detecting a reception time position of a known signal, detection of frame timing from output signals of the unique word detection means A and the unique word detection means B, It is provided with a frame synchronization acquisition / maintenance unit for maintaining, and a decoding unit for decoding the output signal of the adaptive antenna processing unit B and converting it into received data. Also,
When a detection method that requires clock recovery is used, a clock recovery unit that recovers a clock from the same signal as the frame synchronization acquisition and maintenance unit is provided.

In the second embodiment, even when frame synchronization cannot be obtained unless adaptive antenna processing is performed, the effect of fading and multipath propagation paths is large, so that known data and received data can be compared. Adaptive antenna processing unit A that uses CPM or CMA to perform adaptive signal processing to determine the characteristics of the adaptive antenna without making a comparison, and the adaptive antenna characteristics by comparing known data and received data to the guidance principle By using both adaptive antenna processing unit B using an LMS or the like that performs adaptive signal processing to determine the frame synchronization acquisition unit pre-processing, to achieve stable frame synchronization acquisition and maintenance, and in the received data decoding,
For the guiding principle of the adaptive antenna, an LMS or the like that performs adaptive signal processing for determining characteristics of the adaptive antenna by comparing known data and received data is used.

Therefore, a method is provided in which frame synchronization can be more stably acquired and maintained than in the first embodiment, and the effects of fading and multipath propagation can be further suppressed. When a detection method that requires clock recovery is used, stable clock recovery can also be performed.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 shows a configuration for realizing a receiving device with an adaptive antenna having n antennas according to the present invention. The receiving antenna units 201-1 to A / D converter 206-n are the same as those in the first embodiment. Same as the example. 20
7 is a CP that performs adaptive signal processing for determining characteristics of an adaptive antenna without comparing known data and received data.
An adaptive antenna processing unit A that performs adaptive antenna processing using M or CMA to remove distortion.

Reference numeral 209 denotes an adaptive antenna processing unit A
In order to detect the frame timing from the output signal of
The unique word detection unit A detects a unique word that is known data. Reference numeral 211 denotes a unique word detection unit B that detects a unique word that is known data in order to detect a frame timing from an output signal of the adaptive antenna processing unit B. Reference numeral 210 denotes a frame synchronization acquisition / maintenance unit that detects the frame timing time position of the received signal from the output signals of the unique word detection unit A and the unique word detection unit B, and keeps the detected frame synchronization timing constant.

Reference numeral 208 denotes an adaptive antenna process using an LMS or the like for performing adaptive signal processing for determining the characteristics of the adaptive antenna by comparing the known data with the received data at the frame timing obtained by the frame synchronization acquisition maintaining unit. This is the adaptive antenna processing unit B to perform. 212
Is a decoding unit that converts the received signal that has been subjected to the adaptive antenna processing in the adaptive antenna processing unit B208 into reception data. The difference from FIG. 1 is that a unique word detection unit A209 and a unique word detection unit B211 are provided for each adaptive antenna processing unit, and frame synchronization is obtained and maintained from their outputs. When a detection method that requires clock recovery (not shown) is used, a clock recovery unit that recovers a clock from the same signal as the frame synchronization acquisition and maintenance unit is provided.

Next, the operation of the second embodiment will be described. Here, the teaching principle of the adaptive antenna processing unit A is CMA, and the teaching principle of the adaptive antenna processing unit B is L.
An example using MS is shown. Adaptive antenna processing section A207 performs adaptive signal processing so that the envelope at the sample points required for decoding the received signal is constant, and controls the I signal of each antenna so as to suppress the effects of fading and multipath propagation. And the Q signal are combined and output. The unique word detection unit A209 generates a unique word as control data, a training sequence, and the like from the output signal in which the effects of the fading and the multipath propagation path of the adaptive antenna processing unit A207 are suppressed.
The time position of the frames 501-m to 501-m + 2 is detected by utilizing the fact that .about.502-m + 2 is also known on the receiving side.

The unique word detection unit B211 outputs the frame 5 from the output signal of the adaptive antenna processing unit B208.
The time position of 01-m to 501-m + 2 is detected. The frame synchronization acquisition / maintenance unit 210 includes a unique word detection unit A2
09 and the output of the unique word detection unit B211 are subjected to frame correlation processing, the correlation results are compared to determine a frame timing time position, and a unique frame synchronization timing is always maintained even after the determination. Timing correction is performed based on the outputs of the word detection unit A209 and the unique word detection unit B211.

Based on the output of the frame synchronization acquisition / maintenance unit 210, the adaptive antenna processing unit B208 outputs a known signal such as a unique word, a training sequence, or the like.
By comparing 2-m to 502-m + 2 with the received signal, adaptive antenna signal processing for controlling reception characteristics is performed, and fading and distortion components due to a multipath propagation path included in the received signal are removed and output. . Decoding unit 21
2 decodes the output signal of the adaptive antenna processing unit B into received data. When a detection method that requires clock recovery is used, clock recovery is performed from output signals of a plurality of adaptive antenna processes, as in the frame synchronization acquisition and maintenance unit, and the recovered clock is subjected to adaptive antenna processing and frame synchronization acquisition and maintenance processing. , For decryption processing.

Finally, a third embodiment will be described.
The third embodiment performs adaptive signal processing for determining the characteristics of an adaptive antenna without performing comparison between known data and received data, such as CPM or CMA, and performs fading of a received signal and distortion due to a multipath propagation path. And adaptive signal processing such as LMS for determining the characteristics of the adaptive antenna by comparing the known data with the received data based on the frame timing obtained by the frame synchronization acquisition and maintenance means. And an adaptive antenna processing means B for removing distortion of the received signal. Further, a switching means for switching the output signals of the adaptive antenna processing means A and the adaptive antenna processing means B, a frame synchronization acquisition and maintenance means for detecting and maintaining the reception time position based on the output of the switching means, and an adaptive antenna processing means B And decoding means for decoding the output signal of the above and converting it into received data.

In the third embodiment, even when frame synchronization cannot be obtained without adaptive antenna processing due to the large influence of fading and multipath propagation paths, the frame synchronization is obtained (before) when frame synchronization is obtained. Perform adaptive signal processing to determine the characteristics of the adaptive antenna without comparing the data with the received data.Use an adaptive antenna that uses CPM or CMA as a guiding principle for preprocessing of the frame synchronization acquisition means. Performs adaptive signal processing to determine the characteristics of the adaptive antenna by comparing the known data and the received data Perform adaptive signal processing using an LMS or the like to perform preprocessing of the frame synchronization acquisition means to perform stable frame synchronization acquisition and maintenance, In addition, in the reception data decoding, the known data is based on the guiding principle of the adaptive antenna. Using LMS or the like to perform adaptive signal processing to determine the characteristics of the adaptive antenna by comparing the received data.

Therefore, in the third embodiment, the effects of fading and multipath propagation can be further suppressed while realizing smaller hardware, a smaller amount of computation, and lower power consumption than in the second embodiment. When a detection method that requires clock recovery is used, stable clock recovery can also be performed.

Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a configuration for realizing a receiving device with an adaptive antenna having n antennas according to the present invention. The receiving antenna units 301-1 to A / D converter 306-n are the same as those of the first embodiment. Is the same as

Reference numeral 307 denotes adaptive antenna processing using CPM or CMA for performing adaptive signal processing for determining the characteristics of the adaptive antenna without comparing known data with received data, and performs fading and multipath propagation. It is an adaptive antenna processing unit A for removing distortion. A switching unit 309 switches between the output signal of the adaptive antenna processing unit A and the output signal of the adaptive antenna processing unit B and outputs the output signal to the frame synchronization acquisition and maintenance unit 310. Reference numeral 310 denotes a frame synchronization acquisition / maintenance unit that detects a frame timing time position from the output signal of the switching unit 309 and keeps the detected frame timings from shifting.

Reference numeral 308 denotes the frame timing obtained by the frame synchronization acquisition and maintenance unit, which performs adaptive antenna processing using an LMS or the like which performs adaptive signal processing for comparing the known data with the received data and determining the characteristics of the adaptive antenna. This is an adaptive antenna processing unit B that removes distortion. Reference numeral 311 denotes a decoding unit that converts a reception signal that has been subjected to the adaptive antenna processing in the adaptive antenna processing unit B308 into reception data.

The difference from FIG. 1 is that a switching unit 309 for switching the output signals of the adaptive antenna processing unit A 307 and the adaptive antenna processing unit B 308 and inputting the output signal to the frame synchronization acquisition maintaining unit 310 is provided. The point is that the adaptive antenna guidance principle of the preprocessing can be selected. When a detection method that requires clock recovery is used, a clock recovery unit that performs clock recovery from the same signal as the frame synchronization acquisition and maintenance unit is also provided.

Next, the operation of the third embodiment will be described. Here, an example in which CMA is used as the guiding principle of the adaptive antenna processing unit A and LMS is used as the guiding principle of the adaptive antenna processing unit B will be described. The adaptive antenna processing unit A307 performs adaptive signal processing so that the envelope at the sample points required for decoding the received signal is constant, and controls the I signal of each antenna so as to suppress the effects of fading and multipath propagation. And the Q signal are combined and output. The switching unit 309 outputs the output signal of the adaptive antenna processing unit A to the frame synchronization acquisition and maintenance unit 310 before the frame synchronization is acquired, and outputs the output signal of the adaptive antenna processing unit B after the frame synchronization is acquired, under the control of the frame synchronization acquisition and maintenance unit. Output signal is obtained and maintained in frame synchronization 3
Output to 10

The frame synchronization acquisition / maintenance unit 310 performs a frame correlation process based on the fact that unique words, training sequences, etc. 502-m to 502-m + 2 are also known on the receiving side from the input signal. The time positions of the frames 501-m to 501-m + 2 are detected, and the timing is corrected based on the output of the switching unit 309 so that the correct frame synchronization timing is always maintained after the detection.

Based on the output of the frame synchronization acquisition / maintenance unit 310, the adaptive antenna processing unit B 308 generates a known signal such as a unique word, a training sequence, or the like.
By comparing 2-m to 502-m + 2 with the received signal, adaptive antenna signal processing for controlling reception characteristics is performed, and a distortion component included in the received signal is removed and output. Decoding section 311 decodes the output signal of adaptive antenna processing section B into received data. When a detection method that requires clock recovery is used, the output signal of the adaptive antenna processing unit A before the frame synchronization is acquired and the adaptive antenna processing unit B is acquired after the frame synchronization is acquired, like the frame synchronization acquisition and maintenance unit. Clock recovery is performed from the output signal, and the recovered clock is used for adaptive antenna processing, frame synchronization acquisition maintenance processing, and decoding processing.

In this embodiment, the decoding unit 311 receives the output signal of the processing unit B308, but if synchronization is not established, received data cannot be obtained even if decoding is performed. Therefore, the decoding unit 311 may receive the same signal as the output of the switching unit 309, that is, the same signal as the frame synchronization acquisition and maintenance unit 310, or may not perform the processing until the synchronization is established. In this case, the processing unit A 307 and the processing unit B
It is not necessary to execute 308 at the same time, and only one of them needs to be executed. Therefore, when the processing of the processing units A and B is performed by a DSP or the like, the processing amount is reduced, and processing can be performed even with a lower-speed DSP.

[0045]

According to the receiving apparatus with an adaptive antenna according to the first embodiment of the present invention, even when it is difficult to obtain the frame synchronization time position, the preprocessing of the frame synchronization acquisition means includes the known data and the received data. By performing the adaptive signal processing for determining the characteristics of the adaptive antenna without performing the comparison, the frame synchronization timing required to know the time position where the known data exists can be stably obtained. In addition, as a pre-process of decoding received data, adaptive antenna processing using LMS or the like as a guiding principle, in which frame synchronization information is indispensable, can be adopted, and the effects of fading and multipath propagation paths are stronger, and more. This has the effect of being able to stably suppress and improve the reception performance. Furthermore, when a detection method that requires clock recovery is used, there is also an effect that the clock can be recovered stably even when the influence of fading or a multipath propagation path is large, as in the frame synchronization acquisition and maintenance unit.

According to the receiving apparatus with an adaptive antenna according to the second embodiment of the present invention, even when it is difficult to obtain the frame synchronization time position, the known processing such as CPM or CMA is performed in the pre-processing of the frame synchronization acquisition means. By using adaptive signal processing to determine the characteristics of the adaptive antenna without comparing with the received data, and adaptive signal processing to determine the characteristics of the adaptive antenna by comparing known data and received data, such as LMS, by using , It is possible to acquire the frame synchronization timing required for knowing the time position where the known data exists, to realize stable frame synchronization even after the acquisition, and to decode the received data. Adopt adaptive antenna processing using LMS etc. as the guiding principle, where this frame synchronization information is indispensable for pre-processing Bets can be, affected more strongly fading and multipath propagation, it can more stably suppressed by having an effect of improving the reception performance.

According to the receiving apparatus with an adaptive antenna according to the third embodiment of the present invention, even when it is difficult to obtain the frame synchronization time position, the pre-processing of the frame synchronization acquisition means is performed when the frame synchronization acquisition means acquires the known data and the received data. Perform adaptive signal processing to determine the characteristics of the adaptive antenna without comparing with data, and after acquiring frame synchronization,
By performing adaptive signal processing for determining the characteristics of the adaptive antenna by comparing the known data with the received data, the adaptive antenna processing unit that is always operating can be set to one.
Or the time for operating in parallel can be reduced. Also, the frame synchronization required to know the time position where the known data exists can be stably obtained.

For this reason, adaptive antenna processing for performing adaptive signal processing for determining characteristics of an adaptive antenna by comparing known data and received data, such as LMS, for which frame synchronization information is indispensable, can be used. The effects of fading and the effects of multipath propagation paths can be stronger and more stably suppressed while realizing the calculation amount and low power consumption, thereby improving the reception performance. When a detection method that requires clock recovery is used, there is an effect that clock recovery can be performed stably even when fading or multipath propagation has a large effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a third exemplary embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional example.

FIG. 5 is an explanatory diagram showing a general data format.

[Explanation of symbols]

101-i: receiving antenna section of branch i, 102-i
... the first-stage amplifier of the branch i, 103-i ... the frequency converter of the branch i, 104-i ... the quadrature detector of the branch i,
105-i... A signal A / D converter of branch i, 10
6-i: A / D converter for Q signal of branch i, 107 ...
Adaptive antenna processing unit A, 108 ... adaptive antenna processing unit B, 109 ... frame synchronization acquisition and maintenance unit,
110: decoding unit 201-i: receiving antenna unit of branch i, 202-i
... the first-stage amplifier of branch i, 203-i ... the frequency converter of branch i, 204-i ... the quadrature detector of branch i,
205-i: A / D converter for I signal of branch i, 20
6-i: A / D converter for Q signal of branch i, 207 ...
Adaptive antenna processing unit A, 208 ... adaptive antenna processing unit B, 209 ... unique word detection unit A,
210: frame synchronization acquisition / maintenance unit, 211: unique word detection unit B, 212: decoding unit 301-i: reception antenna unit of branch i, 302-i
... the first-stage amplifier of branch i, 303-i ... the frequency converter of branch i, 304-i ... the quadrature detector of branch i,
305-i: A / D converter for I signal of branch i, 30
6-i: A / D converter for Q signal of branch i, 307
Adaptive antenna processing unit A, 308 Adaptive antenna processing unit B, 309 Switching unit, 310 Frame synchronization acquisition maintaining unit, 311 Decoding unit 401-i Receiving antenna unit of branch i, 402-i
.., The first-stage amplifier of branch i, 403-i, the frequency converter of branch i, 404-i, the quadrature detector of branch i,
405-i: A / D converter for I signal of branch i, 40
6-i: A / D converter for Q signal of branch i, 407 ...
Adaptive antenna processing unit, 408: frame synchronization acquisition / maintenance unit, 409: decoding unit 501-i: ith data frame, 502-i ...
Unique word of i-th data frame, training sequence, 503-i ... information data of i-th data frame

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01Q 21/00 H01Q 21/30

Claims (8)

(57) [Claims] 1. A receiving apparatus with an adaptive antenna having a plurality of antennas, comprising: first adaptive antenna processing means for receiving signals from the plurality of antennas and executing a predetermined adaptive antenna control algorithm; Receiving a signal received from an antenna,
Second adaptive antenna processing means for executing an adaptive antenna control algorithm of a scheme different from that of the adaptive antenna processing means, and frame synchronization reproduction with reference to frame synchronization information obtained from the output of the first adaptive antenna processing means. And a decoding unit for decoding received data from the signal after the second adaptive antenna processing. A receiving device with an adaptive antenna, comprising: 2. A receiving apparatus with an adaptive antenna having a plurality of antennas, comprising: first adaptive antenna processing means for receiving signals from the plurality of antennas and executing a predetermined adaptive antenna control algorithm; Receiving a signal received from an antenna,
A second adaptive antenna processing means for executing an adaptive antenna control algorithm of a different system from the adaptive antenna processing means, and a plurality of frame synchronization information obtained from outputs of the first and second adaptive antenna processing means. And a frame synchronization acquisition / maintenance unit for performing frame synchronization reproduction, and a decoding unit for decoding received data from the signal after the second adaptive antenna processing. 3. A receiving apparatus with an adaptive antenna having a plurality of antennas, comprising: first adaptive antenna processing means for receiving signals from the plurality of antennas and executing a predetermined adaptive antenna control algorithm; Receiving a signal received from an antenna,
A second adaptive antenna processing means for executing an adaptive antenna control algorithm of a different system from the adaptive antenna processing means of the first type, and the first adaptive antenna processing means based on whether or not frame synchronization is established.
And frame synchronization acquisition and maintenance means for switching and inputting a plurality of pieces of frame synchronization information obtained from the output of the second adaptive antenna processing means to perform frame synchronization reproduction, and for receiving data from the signal after the second adaptive antenna processing. A receiving device with an adaptive antenna, comprising: decoding means for performing decoding. 4. When the frame synchronization is not established, only the first adaptive antenna processing means is executed, and when the frame synchronization is established, the second adaptive antenna processing means is executed. 4. The receiving apparatus with an adaptive antenna according to claim 3, further comprising an execution control unit that executes only the operation. 5. The first adaptive antenna processing means for performing adaptive signal processing for determining characteristics of an adaptive antenna without comparing known data and received data, wherein the second adaptive antenna processing means 5. The receiving apparatus with an adaptive antenna according to claim 1, wherein the means performs adaptive signal processing for determining characteristics of the adaptive antenna by comparing known data and received data. 6. The receiving device with an adaptive antenna according to claim 1, wherein clock recovery is also performed with the same signal as the frame synchronous reproduction. 7. The receiving apparatus with an adaptive antenna according to claim 1, wherein said first adaptive antenna processing means performs processing according to a CMA method. 8. The method according to claim 1, wherein said first adaptive antenna processing means performs processing according to a CMA method, and said second adaptive antenna processing means performs processing according to an LMS method. The receiving device with an adaptive antenna according to the above description.