CN1248827A - Antenna diversity transfer method and antenna receiver using said method - Google Patents
Antenna diversity transfer method and antenna receiver using said method Download PDFInfo
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- CN1248827A CN1248827A CN 99111796 CN99111796A CN1248827A CN 1248827 A CN1248827 A CN 1248827A CN 99111796 CN99111796 CN 99111796 CN 99111796 A CN99111796 A CN 99111796A CN 1248827 A CN1248827 A CN 1248827A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
- H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
- H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
Abstract
An antenna diversity switching method and receiver to avoid selecting an antenna providing poor reception sensitivity from among a plurality of antennas in response to a measured RSSI value equal to or lower than a predetermined value and thus preventing reception error that is caused by a noise component overlapping a received signal. A RSSI value and a phase likelihood value of a currently connected antenna are measured S1 and on basis of a comparison of RSSI value with a predetermined selection threshold value S4 , either one of the RSSI value and phase likelihood value is selected for comparison against a respective diversity switching criterion S7, S22. Antenna switching is performed if the criterion comparison S7, S22 of the selected value indicates that a switching condition is met. The selection threshold for selecting phase likelihood is a minimum value of a RSSI use range and thus appropriate switching will be carried out, even with a low level received signal, phase likelihood selectively being used when a noise component is at a high level. The criterion for the selection of antennas may be a function of an averaged, past or present value.
Description
The present invention relates to the antenna diversity conversion method, and, relate to the antenna diversity receiver that utilizes this method, wherein, when setting, just carry out conversion from an antenna to another root antenna from the predetermined state in the antenna diversity of an antenna in the many antennas.In more detail, the present invention relates to antenna diversity conversion method and the antenna diversity receiver that utilizes this method, wherein, even when measuring low level RSSI (indication of received signal intensity) value, also can correctly carry out the antenna diversity conversion.
In the antenna diversity receiver of the reference shown in Fig. 1, control circuit 108 control antenna converting units 3 are changed between two antennas 1 and 2.Among Fig. 1, antenna 1 is connected to receiver circuit 4.Finish antenna conversion decision according to the RSSI value that from the signal that receives by receiver circuit 4, draws.
When beginning to communicate by letter in area of radio coverage, the radio signal that antenna 1 receives is fed to receiver circuit 4 through antenna converting unit 3.Receiver circuit 4 converts described radiofrequency signal to intermediate-freuqncy signal, amplifies this intermediate-freuqncy signal, and intermediate-freuqncy signal is converted to the low frequency signal (down-conversion) that can be handled by demodulator circuit 105.Then, low frequency signal is transported to demodulator circuit 105.Demodulator circuit 105 detects data and data clock signal from this low frequency signal.
Receiver circuit 4 is fed to received power sample circuit 6 to the RSSI value of the direct voltage form that draws from radiofrequency signal.Received power sample circuit 6 is according to regularly the direct voltage of received power being sampled by the reception of control circuit 108 outputs.
Figure 10 illustrates three sampling timing A, B and the C among the PHS (personal handyphone system).PHS has the frame structure of eight time slots that comprise receive channel R1 to R4 and send channel T1 to T4.Described three sampling timing are as receiving regularly point " A ", middle regularly point " B " and last timing point " C " of first in the reception electric field cycle that comprises receive path R1 regularly.
With reference to figure 1, carry out analog-to-digital conversion corresponding to the direct voltage of the RSSI value that provides by sampling by received power sample circuit 6 by analog to digital converter 7, then, be transported to control circuit 108.Control circuit 108 adopt from the middle of shown in Figure 10 regularly point " B ", expection is the measurement result of more accurate rssi measurement value, and carries out the antenna diversity operation.
With reference now to the flow chart shown in the calcspar shown in Fig. 1 and Fig. 2,, the algorithm of being carried out by control circuit 108 that is used for the antenna diversity operation is discussed.
By received power sample circuit 6 and analog to digital converter 7, control circuit 108 receives the RSSI value (step S101) of the received signal of regularly being measured in the reception of reference Figure 10 discussion by receiver circuit 4.
When the receiving slot end that reference Figure 10 discusses, control circuit 108 is transferred to past measurement value buffer register 112 to the RSSI values that measure of storage from current measured value register 111.Then, read current rssi measurement value, current rssi measurement value is stored in current measured value register 111 (step S102) from analog to digital converter 7.
After being provided with the RSSI criterion, control circuit 108 is read current rssi measurement value from current measured value register 111, and, current rssi measurement value and RSSI criterion are compared (step S104).When the comparative result among the step S104 shows current rssi measurement value even less than when described criterion deducts the resulting value of predetermined value, control circuit 108 control antenna converting units 3 are transformed into antenna 2 from the antenna 1 of current connection.When current rssi measurement value is equal to, or greater than when described criterion deducts the resulting value of predetermined value, control circuit 108 remains unchanged described connection to antenna 1.Like this, control circuit 108 conversion (step S105) between antenna 1 and antenna 2 as required.With reference to Figure 11, the antenna conversion timing is arranged in the scope of the guard time " G " that was right after before next receiving slot.
When step S105 finishes day line options and conversion operations, control circuit 108 accumulations are stored in current measured value register 111 and past measurement value buffer register 112 (step S106) to them about the RSSI value and the phase place likelihood data of the antenna 1 of current connection.Control circuit 108 averages processing (step S107), so as to determine in step S103, to set, with so as to obtaining the relevant criterion of antenna of current rssi measurement value, and, finish the antenna diversity operation.
In above-mentioned reference antenna diversity conversion method and utilizing in the antenna diversity receiver of this method, can cause bad receiving sensitivity to the unsuitable selection of antenna.
Only carry out a day line options, and the rssi measurement value comprises the big noise component(s) with respect to received signal level with reference to the RSSI value.Bad when linear when having at the circuit that receives this signal under the situation of antenna input low level signal, receiver can continue to use the bad antenna of receiving sensitivity and not be transformed into other antenna.
For example, as disclosed among the uncensored patent disclosure No.Hei 5-183476 of Japan,, replace the RSSI value with the phase place likelihood value in order to address this problem.According to the disclosure, diversity unit receives the phase place likelihood data from demodulator circuit.When selecting antenna, diversity unit utilizes phase place likelihood value rather than RSSI value, with reference to the state of the RSSI value that receives from receiver circuit.
According to described open,, carry out a day line options according to the comparative result of described RSSI value when maximum input RSSI value with when importing difference between the RSSI value of RSSI value and being equal to, or greater than predetermined value near this maximum.When in the scope of described difference in predetermined value, carry out a day line options according to the comparative result of described phase place likelihood value.
With reference to figure 3, discuss in the above-mentioned diversity conversion method between two antenna 1a and 1b, changed of being used in open.With reference to figure 3,4a of receiver circuit shown in the figure and 4b, demodulator circuit 5a and 5b, and diversity unit 110.
Diversity unit 110 receives RSSI-a and RSSI-b from receiver circuit 4a and 4b respectively, and, ' a ' and ' b ' respectively from demodulator circuit 5a and 5b receiving phase likelihood value.Diversity unit 110 at first compares the level of RSSI-a and RSSI-b, then, and when described level difference value during less than ± 3dB, is selected antenna according to the comparative result of phase place likelihood value with respect to predetermined value.When described level difference value with respect to predetermined value be equal to, or greater than ± during 3dB, carry out a day line options according to RSSI value comparative result.
Measure the phase place likelihood value and the RSSI value of each root antenna in the described antenna, and the condition of antenna is selected in prior setting according to this when described antenna is compared.When satisfying described condition, carry out described day line options according to the comparative result of RSSI value.When not satisfying described condition, carry out described day line options according to the comparative result of phase place likelihood value.
According to described open, the antenna diversity conversion method of reference and utilize receiver circuit and the demodulator circuit of the antenna diversity receiver utilization of this method based on each root antenna needs bulky and expensive equipment.This equipment is not to be suitable for very much simple and compact telephone terminal, for example, and PHS.
Therefore, the present invention is directed to first method, wherein, measure the RSSI value and the phase place likelihood value of an antenna that from many antennas, chooses, and, when not satisfying predetermined condition, be transformed into another root antenna from a described antenna.
The purpose of this invention is to provide a kind of antenna diversity conversion method and the antenna diversity receiver that utilizes this method, it is avoided along with measured RSSI value is equal to or less than predetermined value and selects the antenna with bad receiving sensitivity for use from many antennas, thereby gets rid of the reception error that is produced by the noise component(s) that overlaps on the received signal.
Antenna diversity conversion method of the present invention may further comprise the steps: based on the rssi measurement value and the phase place likelihood measured value of an antenna of selecting from described many antennas, according to the preset selection threshold value, among RSSI value relevant and phase place likelihood value, select one with a selected antenna.Then, if when the time rssi measurement value and phase place likelihood measured value and corresponding antenna diversity switching criterion comparison, one that selects for use in rssi measurement value and the phase place likelihood measured value is satisfied predetermined antenna switch condition, then the antenna of selecting for use is transformed into another root antenna.Specifically, at first get in touch the RSSI value and realize determining of antenna diversity conversion.When the RSSI value is equal to or less than the preset selection threshold value, preferably select for use the phase place likelihood value to determine described antenna diversity conversion.
Antenna diversity receiver of the present invention when predetermined condition is met the judgement of the antenna diversity conversion that an antenna of selecting from many antennas draws, is transformed into another root antenna.Antenna diversity receiver comprises control circuit, and the latter is according to selecting threshold value, and one of the RSSI value that the antenna that selection is passed through to be connected records and phase place likelihood value are as the antenna switch condition.Described selection threshold value is the minimum value that is used for the RSSI value of antenna diversity.When current measured value when being background and predetermined value with described minimum RSSI value, described phase place likelihood value is used for described antenna diversity.
When current rssi measurement value was equal to or less than described selection threshold value, described control circuit was selected current phase place likelihood value that records rather than RSSI value for use.Described control circuit compares current phase place likelihood value that records and predetermined criterion, and, when the phase place likelihood value that records antenna from current connection less than with respect to the predetermined value of described criterion the time is transformed into another root antenna.
According to said method and device, antenna diversity receiver only is connected to individual antenna to single receiver circuit and single demodulator circuit.In single antenna diversity of selecting for use and antenna conversion, RSSI value and phase place likelihood value both are used for the selection of described antenna.In sky line options, avoided covering the The noise on the received signal based on described phase place likelihood value.In detail, when received signal is in low level, in selecting day line process, select antenna, even when noise covers received signal, also can get rid of The noise by phase place likelihood value according to described received signal.
Criterion as the antenna switch condition, when the number of measured value reaches predetermined number is the mean value of the measured value of predetermined number, or past measurement value (if not having the available words of mean value), perhaps current measured value (if not having the available words of past measurement value).When current measured value during, just change described antenna than the low predetermined value of criterion.
Described control circuit comprises event counter, and the predetermined value that is used for when the current measurement result of each input preparing to be set at its initial value subtracts one.After the last antenna conversion, import at least continuously after the measurement result of predetermined number, described control circuit just allows the antenna conversion.Utilize this device, obtaining reliable and accurate receptivity under the fading environment more slowly.
Fig. 1 is the block diagram of functional block of the diversity receiver of reference;
Fig. 2 is the flow chart of operating process of the diversity receiver of the reference shown in Fig. 1;
Fig. 3 is the block diagram of functional block that is different from the diversity receiver of the another kind reference shown in Fig. 1;
Fig. 4 is the block diagram of the functional block of one embodiment of the present of invention;
Fig. 5 is the flow chart of described embodiment of the present invention;
Fig. 6 is the flow chart of the RSSI criterion assignment procedure shown in Fig. 5;
Fig. 7 is the flow chart of the phase place likelihood criterion assignment procedure shown in Fig. 5;
Fig. 8 is the flow chart of antenna transfer process among Fig. 5;
Fig. 9 is the flow chart of the antenna transfer process shown in Fig. 5, and this transfer process is different from the transfer process shown in Fig. 8;
How Figure 10 is illustrated in the PHS system measure R SSI value;
Figure 11 is the explanatory of antenna conversion timing in the explanation PHS system;
Figure 12 A to 12C shows the IQ plane in differential Quadrature Phase Shift Keying (D-QPSK) modulation; And
Figure 13 shows an example that receives form and phase place likelihood value measuring section in the PHS system.
With reference now to accompanying drawing, embodiments of the invention is described.
Fig. 4 is the functional block sketch that shows one embodiment of the present of invention.Antenna diversity receiver shown in Fig. 4 comprises: two antennas 1 and 2; Antenna duplexer 3; Receiver circuit 4; Demodulator circuit 5; Received power sample circuit 6; Analog to digital converter 7; Control circuit 8; RSSI selects threshold value memory 10; Current measured value register 11; Past measurement value buffer register 12; And average value information memory 13.
Difference between receiver shown in Fig. 4 and the described reference receiver is demodulator circuit 5 and control circuit 8.Receiver shown in Fig. 4 is also different with the receiver of reference aspect increase RSSI selection threshold value memory 10.Demodulator circuit 5 extracts the phase locus deviation data (phase place likelihood data) of received signal, and it is transported to control circuit 8, and control circuit 8 is used from antenna diversity control to these phase place likelihood data and RSSI value one.Select the minimum value of RSSI range of choice to select threshold value as the threshold value between the phase place likelihood value scope of application and the RSSI value scope of application and as RSSI.Then, selecting this RSSI threshold value to be stored in RSSI selects in the threshold value memory 10.Specifically, when the current RSSI value in the received signal that receiver circuit 4 measures is lower than described RSSI and selects threshold value, phase place likelihood value rather than RSSI value are used for antenna diversity control.
With reference to Figure 10, the PHS system comprises the frame structure that comprises four time slots that are used for receive channel R1-R4 and eight time slots of four time slots that are used for send channel T1-T4.Can be following three sampling timing points as the sampling timing of measure R SSI value: first in the reception electric field section of the reception receive path R1 regularly that provides by control circuit 8 regularly point " A ", middle regularly point " B " and timing point " C " at last are provided.Expection be more accurate rssi measurement value from the middle of described regularly the measurement result of point " B " be used for antenna diversity control.
With reference to Figure 11, the antenna conversion timing is set in the scope of the guard time " G " that was right after before next receiving slot.
With reference to figure 12A, 12B and 12C, DQPSK (differential Quadrature Phase Shift Keying) technology of phase shifts π/4 of using in the PHS system is discussed now.As shown in Figure 12 A, the DQPSK modulating wave is launched two bit data from per 192 KHz of certain reference point offset pi/4 on four direction with this.If described ripple is ideally along around 8 some phase shifts that evenly separate of a circle, as shown in Figure 12B, then by sequentially every two points point couple together, promptly, the each point that separates 135 ° coupled together form a kind of track in the various tracks.By being coupled together, each adjacent point forms another kind of track.But, when decline occurring, the scope with respect to ideal orientation ± π/4 is handled as examining or check the zone, shown in Figure 12 C, and, can be displaced to any point in this examination zone to ripple.
When track when each preposition departs from described center, the center in the approaching more examination zone of track, expection demodulator circuit 5 will accurately reproduce the data that received.When track departs from the center in examination district significantly, in the described reception data error appears probably.Demodulator circuit 5 this be that the phase deviation of the phase place likelihood of two bit data forms is transported to the control circuit 8 shown in Fig. 1, simultaneously, described two bit data in " 11 " to the scope of " 00 ".Specifically, bit data " 11 " is given the center, and simultaneously, bit data " 00 " is given ± π/4 phase deviations.
With reference to Figure 13, the reception data that are compiled into single form comprise 240, and, information (I) data division that receives data occupies 160 (80 symbols), 8 pairs of these phase place likelihood values about the I part of 160 bit data of control circuit are counted, and, carry out antenna diversity control according to phase place likelihood value or the RSSI value discussed.
The element of the receiver shown in Fig. 4 is described now.
Under the control of control circuit 8, antenna duplexer 3 is connected to receiver circuit 4 to one of antenna 1 and 2.Here, antenna 1 is connected to receiver circuit 4 by antenna duplexer 3.
When area of radio coverage begins to communicate by letter, receiver circuit 4 converts the radiofrequency signal that receives by antenna 1 and antenna duplexer 3 to intermediate-freuqncy signal, and amplifies this intermediate-freuqncy signal.Receiver circuit 4 converts intermediate-freuqncy signal can then, to be transported to demodulator circuit 5 by the low frequency signal of demodulator circuit 5 processing to.Simultaneously, receiver circuit 4 converts RSSI to d. c. voltage signal, and it is transported to received power sample circuit 6.
Received signal after 5 pairs of down-conversions of demodulator circuit is carried out demodulation, reproduction and dateout and data clock signal.In addition, as with reference to as described in the figure 12A to 12C, demodulator circuit 5 phase place likelihood data delivery to control circuit 8.
As with reference to as described in Figure 10, the reception timing that response is sent here by control circuit 8, received power sample circuit 6 is sampled to the d. c. voltage signal corresponding with the RSSI value that receives from receiver circuit 4 at three sampled points " A ", " B " and " C ", and, the result is transported to analog to digital converter 7.
Analog to digital converter 7 becomes binary code to the d. c. voltage signal analog-to-digital conversion that receives from received power sample circuit 6, and, this binary code is transported to control circuit 8.
RSSI selects threshold value memory 10 storage in advance to select threshold value, and the latter determines that control circuit 8 is to carry out described antenna diversity control according to the RSSI value or according to the phase place likelihood value.Under the control of control circuit 8, current measured value register 11 storages are about the up-to-date RSSI value and the up-to-date phase place likelihood value of each root antenna in antenna 1 and 2.Under the control of control circuit 8,12 storages of past measurement value buffer register are about the continuous RSSI value of the predetermined number before the data each root antenna in antenna 1 and 2, in being stored in current measured value register 11 and continuous phase place likelihood value.13 storages of average value information memory are about the average result of RSSI value each root antenna, defined amount and phase place likelihood value in antenna 1 and 2.
Describe the function and the antenna diversity algorithm of control circuit 8 in detail below with reference to the flow chart shown in the calcspar shown in Fig. 4 and Fig. 5.
When the described receiving slot of reference Figure 10 finished, control circuit 8 was RSSI value and past phase place likelihood value are transferred to past measurement value buffer register 12 from current measured value register 11 in the past.Then, control circuit 8 is stored in two types the measurement results of determining in the zone that keeps for antenna 1 of current measured value register 11 (step S3) in step S2.
Under the control of control circuit 8, past measurement value buffer register 12 is stored in predetermined number in its zones that are respectively antenna 1 and 2 reservations about the RSSI of received signal and the measurement result of phase place likelihood.
After the store measurement values, control circuit 8 selects the RSSI value that is stored in the current measurement in the current measured value register 11 threshold value to compare (step S4) with the RSSI that is stored in the RSSI selection threshold value memory 10 on amplitude in step S3.
When determining in above-mentioned comparison: because high received signal intensity, when current rssi measurement value was selected threshold value (that is, the "Yes" among the step S5) greater than RSSI, control circuit 8 was provided with predetermined RSSI criterion (step S6).Below with reference to Fig. 6 this criterion assignment procedure is described.
As mentioned above, in antenna diversity control, when the antenna 1 that is connected to receiver circuit 4 provides the value of its amplitude less than predetermined requirement, carry out described selection and conversion operations, so that be transformed into another antenna 2 from antenna 1.
For according to RSSI value converting antenna, must determine the level of this RSSI value.Because phase deviation changes in each receiving slot, so, the influence of determining to be subjected to error of received signal RSSI level.In order to get rid of this error, in the frame of whole predetermined number, the RSSI value is accumulated and is averaged, then, average R SSI value as described criterion.To the phase place likelihood value also is such processing.In this embodiment, described mean value is as criterion.
When the sky line options among the step S8 and conversion operations are finished, the current measurement of control circuit 8 accumulation, about the RSSI value and the phase place likelihood data of antenna 1, they are stored in current measured value register 11 and the past measurement value buffer register 12 (step S9).When the number of measured value is less than predetermined number (, the "No" among the step S10) time, described processing procedure finishes.If the number of measured value reaches predetermined number, that is, if the "Yes" among Figure 10, then the measurement result of 8 pairs of predetermined number of control circuit averages processing (step S11).Then, control circuit 8 deposits the average result of described measurement result in the average value information memory 13 in, and average end mark (step S12) is set.Processing procedure leaves it at that.
When the answer among the step S5 is "No", that is, when determining in step S5: when current rssi measurement value was not more than RSSI selection threshold value, control circuit 8 was used for antenna diversity control to phase place likelihood value rather than RSSI value.Control circuit 8 is provided with predetermined phase place likelihood criterion (step S21).Below with reference to Fig. 7 described criterion assignment procedure is discussed.
Then, control circuit 8 compares (step S22) to the phase place likelihood value of current measurement and the phase place likelihood criterion of setting in step S21.When determining in described comparison: the value of current measurement is less than when described phase place likelihood criterion deducts the resulting value of predetermined value, and control circuit 8 is selected antennas 2, cancellation selection antenna 1.Correspondingly, control circuit 8 control antenna change over switches 3 are substituted into antenna 2 to the connection of receiver circuit 4 from antenna 1.When not satisfying this antenna switch condition, carry out the not predetermined sky line options and the switch process (step S23) of converting antenna.The concrete operations of this step are discussed below with reference to Fig. 8.
After step S23, control circuit 8 forwards step S9 to.Correspondingly, control circuit 8 is accumulated respectively about the RSSI value of the current measurement of antenna 1 and phase place likelihood value, they are stored in the current measured value register 11, then, about the described RSSI value of antenna 1 and described phase place likelihood storage in the past in the measured value buffer register 12.
With reference to flow chart and the Figure 4 and 5 of Fig. 6, describe the RSSI criterion assignment procedure among the above-mentioned steps S6 in greater detail.
When using described RSSI value under the situation that answer is "yes" in above-mentioned steps S5, the average end mark of RSSI (step S31) in the control circuit 8 inspection average value information memories 13 about the antenna 1 that is currently connected to receiver circuit 4.
When having described average end mark (that is, the "Yes" among the step S32), control circuit 8 is read mean value about the antenna 1 of current connection from average value information memory 13, and, this mean value is set at criterion (step S33).When not having described average end mark under the answer in step S32 is the situation of "No", control circuit 8 search are stored in the RSSI value (step S34) of the past measurement in the past measurement value buffer register 12 at last.When the RSSI value that has past measurement (that is, the "Yes" among the step S35), control circuit 8 is read the RSSI value of past measurement, and, the RSSI value of this past measurement is set at described criterion (step S36).When the answer in step S35 is a "No" and when not having the RSSI value of past measurement, control circuit 8 is read current rssi measurement value from current measured value register 11, and, this current rssi measurement value is set at described criterion (step S37).
Like this, in above-mentioned steps S7, RSSI criterion and current rssi measurement value are compared.
With reference now to flow chart shown in Fig. 7 and Figure 4 and 5, phase place likelihood criterion assignment procedure among the above-mentioned steps S21 is described.
When the answer in above step S5 is when under the situation of "No" the phase place likelihood being used for diversity control, control circuit 8 is checked in the average value information memories 13 the average end mark of phase place likelihood (step S41) about the antenna 1 that is connected to receiver circuit 4.
When having average end mark (, the "Yes" among the step S42), control circuit 8 is read mean value about the antenna 1 of current connection from average value information memory 13, and, this mean value is set at criterion (step S43).When under the answer in step S42 is the situation of "No", not having average end mark, the up-to-date phase place likelihood value (step S44) that is stored in the past measurement in the past measurement value buffer register 12 of control circuit 8 search.When the phase place likelihood value that has past measurement (that is, the "Yes" among the step S45), control circuit 8 is read the phase place likelihood value of past measurement, and, the phase place likelihood value of this past measurement is set at described criterion (step S46).When the answer in step S45 is a "No" and when not having the phase place likelihood value of past measurement, control circuit 8 is read the phase place likelihood value of current measurement from current measured value register 11, and, the phase place likelihood value of measuring before deserving is set at described criterion (step S47).
In above-mentioned steps S22, the phase place likelihood criterion of setting like this and the phase place likelihood value of current measurement are compared.
With reference now to the flow chart shown in Fig. 8 and Figure 4 and 5, sky line options and transfer process among above-mentioned steps S8 and the S23 are described in more detail.
In above-mentioned steps S7 or S22, respectively RSSI value and phase place likelihood value and their criterions are separately compared.At current measured value (promptly less than described criterion, "Yes" among the step S51) time, control circuit 8 is determined the difference (step S52) between described criterions and the current measured value, and, this difference and predetermined value about RSSI or phase place likelihood are compared (step S53).When in described comparison, determining: described difference is during greater than described predetermined value (, "Yes" among the step S54), in other words, when interested value during, the connection of receiver circuit 4 is changed to antenna 2 (step S55) from antenna 1 current connection, that measuring less than needed value.
Like this, be transformed under the situation that preestablishes another root antenna that is better than needed value at least from an antenna, receiver is received signal under good state.
When the answer in step S51 is when current measured value is equal to, or greater than criterion under the situation of "No", perhaps, when the answer in step S5 is when described difference is equal to or less than predetermined value under the situation of "No", control circuit 8 is selected the antenna 1 of current connection, does not relate to antenna and reconnects.For RSSI and phase place likelihood are provided with predetermined value separately.
In the superincumbent description, check the antenna switch condition at each received frame.When the radio wave accepting state is bad, make all antennas satisfy the antenna switch condition, every reception one frame is converting antenna all.
For fear of every reception one frame converting antenna all, control circuit 8 comprises the event counter that is used for the antenna conversion, as shown in Figure 4.When converting antenna, event counter is given tacit consent to the initial value of its subtotal figure, and received frame of every reception all subtracts 1 with event counter.At least in the time interval, do not carry out the antenna conversion corresponding to the initial count number of times of received frame.
With reference now to Fig. 9 description, has the function of antenna conversion is carried out in eliminating at each received frame embodiment.
In above-mentioned steps S7 and S22, respectively RSSI value and phase place likelihood value and their criterions are separately compared.At current measured value (promptly less than described criterion, "Yes" among the step S61) time, control circuit 8 is determined the difference (step S62) between described criterions and the current measured value, and, this difference and predetermined value about RSSI or phase place likelihood are compared (step S63).When determining in described comparison: described difference is during greater than described predetermined value (, the "Yes" among the step S64), in other words, when interested value during less than needed value, control circuit 8 inspection described event counters (step S65).
When the counting of event counter was zero (that is, the "Yes" among the step S66), control circuit 8 was selected antenna 2, cancellation is selected just at antenna 1 measured, current connection, and reconnect to antenna 2 (step S67), simultaneously, give tacit consent to the initial value (step S68) of this event counter.
When the answer in step S61 is when current measured value is equal to, or greater than criterion under the situation of "No", perhaps, when the answer in step S64 is when described difference is equal to or less than predetermined value under the situation of "No", perhaps, when the answer in step S66 is that the counting of event counter under the "No" situation is not when being zero, control circuit 8 is selected the antenna 1 of current connection, does not relate to antenna and reconnects.Control circuit 8 subtracts 1 with the counting of event counter, and finishes described processing procedure (step S69).
Under the situation of this configuration, in the initial counts of received frame, receiver rests on the same antenna at least, does not carry out the antenna conversion.Even under slow fading environment, also can expect reliable and fabulous receiving feature.
The functional block and the operating process of antenna diversity receiver have been discussed.Randomly, the arrangement that changes these functional blocks is possible, for example, can be divided into some to a functional block, perhaps, can a plurality of be integrated in the piece, as long as can carry out the function of each piece.It also is possible changing described operating process, for example, can put upside down the order of some steps, perhaps, can carry out some steps simultaneously concurrently.Intention described above does not limit the scope of the invention.
According to the present invention, avoided the reception error that causes by the noise component(s) that is superimposed upon on the received signal.Its reason is: owing to when determining the sky line options, except benchmark RSSI, also consider not overlap the phase place likelihood of the noise component(s) on the received signal, so improved diversity gain.
Advantageous particularly of the present invention when receiving low level signal.Its reason is: the minimum value that the switching threshold between use RSSI and the likelihood of use phase place is configured such that the RSSI scope of usefulness.
Under the situation of low level received signal, in the environment of slowly decline, the expection receptivity is good in reliably.Its reason is: frequent antenna switching motion has been got rid of in the use of event counter.
Claims (9)
- One kind many antennas from an antenna diversity conversion method that is transformed into another root, it comprises:Measure the RSSI value and the phase place likelihood value of an antenna of current selection and use in the described antenna;Based on the preset selection threshold value, in described RSSI value that records and the phase place likelihood value that records, select one; AndIf a value of described selection satisfies the predetermined antenna switch condition that is different from corresponding antenna diversity switching criterion when the corresponding antenna diversity switching criterion comparison of the described value that records and the above, then be transformed into another root antenna from described current antenna.
- 2. according to the antenna diversity conversion method of claim 1, it is characterized in that:When described definite antenna diversity conversion, at first select described RSSI value, and, when being lower than level based on described preset selection threshold value, described RSSI value selects described phase place likelihood value.
- 3. according to the antenna diversity conversion method of claim 1, it is characterized in that:When current measured value was lower than described antenna diversity switching criterion, described being used for was met from the described antenna switch condition that the described antenna of at first selecting is transformed into another root antenna; AndDescribed antenna diversity switching criterion is the mean value of described each measured value when having the measured value of predetermined number, perhaps, is the past measurement value when not having mean value, perhaps, is current measured value when not depositing the past measurement value.
- 4. according to the antenna diversity conversion method of claim 1, it is characterized in that:In case carry out the antenna conversion, just suspend antenna conversion next time, until the measured value that after described antenna conversion, obtains predetermined number.
- 5. one kind is used for determining that the antenna diversity conversion is transformed into the antenna diversity receiver of another root antenna from first antenna of many sky line options when satisfying predetermined condition, and described antenna diversity receiver comprises:Antenna duplexer is in order to select and be connected an antenna of selecting from many antennas;Receiver circuit is in order to becoming low frequency by described antenna duplexer from the conversion of signals that the antenna of described connection receives, so that signal after the output frequency conversion and RSSI;Demodulator circuit is in order to the signal demodulation after the described frequency translation, so that signal and phase place likelihood after the output demodulation;Control circuit, when being used for when described RSSI that obtains from the antenna of described current connection and described phase place likelihood one and satisfying predetermined condition, the antenna from current connection under the control of described antenna duplexer is transformed into another root antenna;Wherein, described control circuit receives RSSI value and the phase place likelihood value by the antenna reception of described current connection, select in the phase place likelihood of the RSSI of described measurement and measurement both according to the preset selection threshold value one, and, a value of described selection satisfies predetermined antenna switch condition when the value of described measurement is compared with corresponding antenna diversity switching criterion, then is transformed into another root antenna from described current antenna.
- 6. according to the antenna diversity receiver of claim 5, it is characterized in that:Described control circuit is set at the described selection threshold value of at first selecting described antenna to the minimum value of the range of choice RSSI of the RSSI for preparing to be used for antenna diversity, and, when the RSSI of current measurement value is carried out a day line options according to described phase place likelihood value during less than described minimum value.
- 7. according to the antenna diversity receiver of claim 5, it is characterized in that:Described control circuit is set at the minimum value of the range of choice RSSI of the RSSI for preparing to be used for antenna diversity the described selection threshold value of the antenna of described current connection, when being not more than described selection threshold value, the RSSI of current measurement value selects the phase place likelihood value of current measurement, the phase place likelihood value of described current measurement and predetermined criterion are compared, when the phase place likelihood value of the described current measurement antenna from current connection when being set to than the little predetermined value of described criterion is transformed into another root antenna.
- 8. according to the antenna diversity receiver of claim 7, it is characterized in that:Described control circuit utilizes the mean value of each measured value as preparing and current measured value criterion relatively when having the measured value of predetermined number, perhaps, when not having mean value, utilize the past measurement value, perhaps, when not having the past measurement value, utilize current measured value.
- 9. according to the antenna diversity receiver of claim 5, it is characterized in that:Described control circuit comprises event counter, it is count value that the latter gives tacit consent to initial value, and when importing current measured value counting is subtracted one at every turn, wherein, in case carry out the antenna conversion, described event counter suspends antenna conversion next time, until the measured value that obtains predetermined number after described antenna conversion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10226083A JP3105869B2 (en) | 1998-08-10 | 1998-08-10 | Antenna diversity switching method and antenna diversity receiving apparatus using the method |
| JP226083/1998 | 1998-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1248827A true CN1248827A (en) | 2000-03-29 |
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ID=16839567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99111796 Pending CN1248827A (en) | 1998-08-10 | 1999-08-10 | Antenna diversity transfer method and antenna receiver using said method |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3105869B2 (en) |
| CN (1) | CN1248827A (en) |
| AU (1) | AU4345699A (en) |
| GB (1) | GB2342820A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324814C (en) * | 2001-02-14 | 2007-07-04 | 日本电气株式会社 | Mobile communication system, base station, and communication control method |
| CN100382440C (en) * | 2004-11-22 | 2008-04-16 | Lg电子株式会社 | Apparatus and method for processing digital multimedia broadcast (DMB) signals |
| US7627301B2 (en) | 2006-02-17 | 2009-12-01 | Shenzhen Mindray Bio-Medical Electronics Co., Ltd. | Spatial diversity receiving device and input channel switching method |
| US7747233B2 (en) | 2004-10-23 | 2010-06-29 | Samsung Electronics Co., Ltd | Apparatus and method for selecting an antenna in a digital broadcast receiving terminal |
| CN101060359B (en) * | 2006-04-21 | 2010-09-15 | 友达光电股份有限公司 | Antenna selection method and device |
| CN1691536B (en) * | 2004-04-28 | 2010-09-29 | 索尼株式会社 | Wireless communication system |
| CN1902837B (en) * | 2003-12-29 | 2012-09-05 | 英特尔公司 | Multicarrier receiver with antenna selection and maximum ratio combining |
| CN101268634B (en) * | 2005-09-22 | 2014-12-10 | 奥林巴斯株式会社 | Receiving device |
| CN112363188A (en) * | 2020-10-13 | 2021-02-12 | 无锡卡尔曼导航技术有限公司 | Tracking loop method and device for multi-diversity satellite navigation receiver |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000196512A (en) * | 1998-12-25 | 2000-07-14 | Nec Mobile Commun Ltd | Diversity control circuit for mobile communication unit and diversity control method |
| ATE323978T1 (en) * | 2001-03-02 | 2006-05-15 | Fuba Automotive Gmbh | DIVERSITY SYSTEM FOR RECEIVING DIGITAL TERRESTRIAL AND/OR SATELLITE RADIO SIGNALS FOR VEHICLES |
| GB2402300B (en) * | 2003-03-31 | 2006-08-30 | British Telecomm | Network |
| JP4200939B2 (en) | 2004-05-19 | 2008-12-24 | ソニー株式会社 | Wireless communication system, receiving apparatus and receiving method |
| JP4547521B2 (en) * | 2008-09-10 | 2010-09-22 | Ｎｅｃアクセステクニカ株式会社 | Communication equipment, antenna switching method, program |
| JP6295818B2 (en) * | 2014-05-15 | 2018-03-20 | 株式会社Ｓｏｋｅｎ | Receiving machine |
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| JPS6090227A (en) * | 1983-10-25 | 1985-05-21 | Japan Styrene Paper Co Ltd | Preliminarily expanded particle of polypropylene based resin |
| US5203023A (en) * | 1989-03-28 | 1993-04-13 | Nippon Telegraph And Telephone Corporation | Phase likelihood comparison diversity receiver |
| US5280637A (en) * | 1991-09-18 | 1994-01-18 | Motorola, Inc. | Phase combining method and apparatus for use in a diversity receiver |
| JPH05183476A (en) * | 1992-01-07 | 1993-07-23 | Fujitsu Ltd | Diversity receiver after detection |
| US5430769A (en) * | 1992-11-23 | 1995-07-04 | Motorola, Inc. | Method and apparatus for controlling switched antenna diversity systems |
| US5499397A (en) * | 1994-05-02 | 1996-03-12 | Motorola, Inc. | Switched antenna diversity algorithm employing received signal strength, phase errors and recovered clock |
| GB2308530B (en) * | 1995-12-21 | 2000-03-22 | Nokia Mobile Phones Ltd | Antenna selection control circuitry |
| JPH10256965A (en) * | 1997-03-10 | 1998-09-25 | Matsushita Electric Ind Co Ltd | Diversity reception equipment |
| JP2928224B1 (en) * | 1998-02-26 | 1999-08-03 | 静岡日本電気株式会社 | Antenna switching diversity receiving apparatus and receiving method |
-
1998
- 1998-08-10 JP JP10226083A patent/JP3105869B2/en not_active Expired - Fee Related
-
1999
- 1999-08-09 AU AU43456/99A patent/AU4345699A/en not_active Abandoned
- 1999-08-10 CN CN 99111796 patent/CN1248827A/en active Pending
- 1999-08-10 GB GB9918860A patent/GB2342820A/en not_active Withdrawn
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1324814C (en) * | 2001-02-14 | 2007-07-04 | 日本电气株式会社 | Mobile communication system, base station, and communication control method |
| CN1902837B (en) * | 2003-12-29 | 2012-09-05 | 英特尔公司 | Multicarrier receiver with antenna selection and maximum ratio combining |
| CN1691536B (en) * | 2004-04-28 | 2010-09-29 | 索尼株式会社 | Wireless communication system |
| US7747233B2 (en) | 2004-10-23 | 2010-06-29 | Samsung Electronics Co., Ltd | Apparatus and method for selecting an antenna in a digital broadcast receiving terminal |
| CN100382440C (en) * | 2004-11-22 | 2008-04-16 | Lg电子株式会社 | Apparatus and method for processing digital multimedia broadcast (DMB) signals |
| US7493096B2 (en) | 2004-11-22 | 2009-02-17 | Lg Electronics Inc. | Apparatus and method for processing digital multimedia broadcast (DMB) signals |
| CN101268634B (en) * | 2005-09-22 | 2014-12-10 | 奥林巴斯株式会社 | Receiving device |
| US7627301B2 (en) | 2006-02-17 | 2009-12-01 | Shenzhen Mindray Bio-Medical Electronics Co., Ltd. | Spatial diversity receiving device and input channel switching method |
| CN101060359B (en) * | 2006-04-21 | 2010-09-15 | 友达光电股份有限公司 | Antenna selection method and device |
| CN112363188A (en) * | 2020-10-13 | 2021-02-12 | 无锡卡尔曼导航技术有限公司 | Tracking loop method and device for multi-diversity satellite navigation receiver |
| CN112363188B (en) * | 2020-10-13 | 2021-06-11 | 无锡卡尔曼导航技术有限公司 | Tracking loop method and device for multi-diversity satellite navigation receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000059277A (en) | 2000-02-25 |
| AU4345699A (en) | 2000-03-02 |
| JP3105869B2 (en) | 2000-11-06 |
| GB2342820A (en) | 2000-04-19 |
| GB9918860D0 (en) | 1999-10-13 |
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