CN1135755C - Method and apparatus for antenna realignement in mobile radiotelephone using injected audio signal - Google Patents
Method and apparatus for antenna realignement in mobile radiotelephone using injected audio signal Download PDFInfo
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- CN1135755C CN1135755C CNB97193004XA CN97193004A CN1135755C CN 1135755 C CN1135755 C CN 1135755C CN B97193004X A CNB97193004X A CN B97193004XA CN 97193004 A CN97193004 A CN 97193004A CN 1135755 C CN1135755 C CN 1135755C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/23—Indication means, e.g. displays, alarms, audible means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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Abstract
A mobile radiotelephone injects an audible alignment signal which is a function of the orientation of the radiotelephone antenna, into the audible radiotelephone communications. The audible alignment signal prompts the radiotelephone user to reorient the radiotelephone antenna for improved alignment with the source of radiotelephone communications. The audible alignment signal is preferably a function of the received signal strength of the radiotelephone communications. The audible alignment signal is preferably artificial noise which is injected in the radiotelephone loudspeaker along with the radiotelephone communications signal, to thereby restore subjective graceful degradation behavior to the received radiotelephone communications. Artificial noise injection is preferably used with coded digital radiotelephone systems which do not audibly degrade until a threshold is reached, below which communications are suppressed. Artificial noise injection may also be used with variable power base stations.
Description
Invention field
The present invention relates to communication system, specifically relate to the mobile radiotelephone communication system of communicating by letter with ground base station or orbiter.
Background of invention
Wireless communication system is used for wireless mobile communications just more and more.The mobile radiotelephone that the wireless communication system use is communicated by letter with ground base station or orbiter.An example of mobile radiotelephone is a cell phone system.Cell phone system is to adopt the wide-area communication network of frequency multiplexing mode.Blecher is at the Vol.VT29 in May nineteen ninety of the vehicle-mounted technology proceedings of IEEE (IEEE Transaction onVehicular Technology), No.2 is entitled as design and the work of having described the analog cellular telephone system in the article of " Advanced Mobile Phone Service " in the pp.238-244.The analog cellular telephone system is also referred to as " AMPS " system.
Recently, digital cellular telephone system and adopt time division multiple access (TDMA) structure to realize above-mentioned digital cellular telephone system has also been proposed.Electronic Industries Association (EIA) and telecommunications industry association (TIA) have also proposed to be used for the standard of digital cellular (ADC) structure of the U.S., and above-mentioned digital cellular (ADC) structure is bimodulus simulation and the digital system that meets EIA/TIA file IS-54B.Assignee of the present invention is just promoting the phone of having realized IS-54B bimodulus structure at present on market.The various criterion that is applicable to digital cellular telephone system has been issued in Europe.The Europe Digital Cellular System is also referred to as GSM, and it also is to use the TDMA structure.
Well-known for those skilled in the art person is that mobile radiotelephone comprises antenna and the transceiver that is used for receiving via the mobile radiotelephone antenna radiotelephone communication.In vehicle-mounted mobile radiotelephone, antenna generally is loaded on the car body.In the hand-held mobile radio phone, antenna generally highlights from the handheld wireless phone housing.The correct orientation of the antenna that radiotelephone communication signals is relevant is for undistorted or call drop and clearly to receive be crucial.As well-known, the direction that often slightly changes antenna will cause the remarkable improvement of radio telephone reception.For example, when the opposite side from user's head receives transmission, cell-phone will suffer the loss of signal strength signal intensity.Head stop the loss of signal that can cause 6dB.
Because the direction of antenna is so important in mobile radiotelephone, so many mobile radiotelephones provide the signal strength signal intensity of the radiotelephone communication signals of being received to show that it can point out the user to redirect antenna.In addition, the quality of received signal trends towards little by little worsening with antenna misalignment increase in simulation or uncoded digital mobile radio telephone system.Therefore, noise level trends towards little by little increasing, and it can point out the user to redirect antenna.Method vehicle-carried mobile or handheld wireless phone can reduce above-mentioned noise by this.
Adopting digital speech code or digital error correction coding at present in wireless communication system is commonplace so that improve communication efficiency.Above-mentioned digital coding allows communication being reduced to than good quality under the situation that is low to moderate 2dB or lower signal to noise ratio, and will end sharp under this thresholding.Therefore, lost simulation FM or the comfort that worsens of coded system not, and replaced the comfort that worsens in sharp cut-off mode under the thresholding.In this type of digital coding wireless communication system, relatively poor orientation can cause that signal strength signal intensity is reduced under the thresholding so that communication suddenly ends.The reduction of signal strength signal intensity can not followed the increase that can point out the noise level that antenna need redirect.
Summary of the invention
Therefore, an object of the present invention is to provide and be used to aim at and the system and method for receiving the mobile radiotelephone antenna direction that mobile radiotelephone is communicated by letter relevant.
Another object of the present invention provides and is used for adopting coding techniques and therefore producing the method and system of the digital mobile radio words directional antenna under the thresholding that a signal ends.
According to the present invention, provide these and other purpose by the mobile radiotelephone that audio frequency aligning direction signal is inserted in the audio frequency radiotelephone communication, above-mentioned audio frequency aligning direction signal is the function of aerial for radio telephone direction.Audio frequency aligning direction signal prompt wireless telephone user improves the direction relevant with the radiotelephone communication source so that aim at the aerial for radio telephone direction again.
Particularly, the radiotelephone communication of receiving has the intensity of receiving signal, and it is the function of aerial for radio telephone position.According to the present invention, audio frequency aligning direction signal is the function of receiving signal strength signal intensity of radiotelephone communication, and it inserts the audio frequency radiotelephone communication.Audio frequency aligning direction signal can be to receive the direct function of signal strength signal intensity or can be the function that depends on another parameter of signal strength signal intensity indirectly, for example distortion or noise level.Audio frequency aligning direction signal is the man-made noise in radiotelephone communication signals is inserted the radio telephone loud speaker preferably, and the performance that the subjective comfortable feeling of radiotelephone communication worsens is received in recovery by this.By recovering the performance that subjective comfortable feeling worsens artificially, the present invention points out the user and receives radiotelephone communication so that aim at the aerial for radio telephone direction again.
Mobile radiotelephone according to the present invention comprises the device that is used to receive radiotelephone communication, and above-mentioned mobile radiotelephone comprises antenna and radio receiving-transmitting unit.The signal intensity indicating equipment response is used to produce the receiving system of signal strength signal intensity indication, and above-mentioned signal strength signal intensity indication is a function of receiving the signal strength signal intensity of radiotelephone communication.As described above, the signal strength signal intensity indication can be the direct or indirect function of a signal strength signal intensity.Audio frequency sensing device response receiving system and signal indicating device produce one and combine the sound signal of receiving radiotelephone communication and signal strength signal intensity indication so that provide the indication of sound signal intensity with the audio frequency radiotelephone communication, and above-mentioned audio frequency sensing device generally comprises one or more loud speaker or earplug loud speaker and can comprise the speech coder and other circuit.
The present invention is useful especially to digital coding radio telephone or other mobile radiotelephone, wherein receiving system is a sharp cut-off receiving system, when receiving that radiotelephone communication signals is on the thresholding, above-mentioned receiving system produces the audio frequency radiotelephone communication signals, and when receiving that radiotelephone communication signals is under the thresholding, above-mentioned receiving system suppresses or ends the audio frequency radiotelephone communication signals.To this type of radio telephone, signal intensity indicating equipment produces alarm signal, and above-mentioned alarm signal is that the function of receiving intensity of radiotelephone communication signals is so that notice receives that the intensity of signal approaches thresholding.
Signal intensity indicating equipment preferably includes the device that is used to produce man-made noise, and the increase of above-mentioned man-made noise is as the function that signal strength signal intensity reduces of receiving of radiotelephone communication signals, and expression receives that signal strength signal intensity is worsening or approaching thresholding by this.The best conduct of the increase of man-made noise is received the function that signal strength signal intensity reduces of receiving the signal strength signal intensity on the thresholding of receiving signal strength signal intensity that is lower than thresholding, expression receives that signal strength signal intensity is approaching thresholding and passing through thresholding by this.Yet, the audio frequency indication that the intensity that also can use increases with signal intensity increases.Therefore, even suppressed radiotelephone communication signals, the man-made noise level still can point out the user so that antenna aligning direction again, and above-mentioned antenna aligning direction again will recover communication.
Man-made noise can be any being different to receive radiotelephone communication and as the signal of antenna direction function.For example, man-made noise can be broadband white noise or pink noise, singlely reduce as signal strength signal intensity and the sinusoidal frequency that changes or a plurality ofly reduce as signal strength signal intensity and the sinusoidal frequency that changes according to amplitude or frequency according to amplitude or frequency.Perhaps, can to be periodic signal worsening or approaching thresholding so that signal strength signal intensity is received in expression man-made noise, for example clatter (Click) or pond pond sound (Chirp), the cycle that their repeat changes the function of receiving change in signal strength as radiotelephone communication signals.The periodic signal of above-mentioned variation can be similar to wireless tuning indication.Man-made noise can be the speech information that synthesizes, and for example the speech of audio frequency " moves ", and it increases as receiving signal strength signal intensity intensity to reduce according to amplitude or frequency.
The present invention couple is also useful especially with the mobile radiotelephone of the automated power control of locating to use at transmitter (ground base station or satellite) (APC).Above-mentioned emissive power control system causes that transmitter increases its power so that response is being received an indication than low signal intensity from the mobile radiotelephone of mobile radiotelephone.This automatic power control system provides a strict more thresholding, because it prevents that the slow reduction of receiving signal strength signal intensity that automatic power control system can follow the tracks of is up to more power no longer is provided.
According to the present invention, transmitter is with radiotelephone communication transmitting power index signal.The transmitting power index signal of receiving according to the response radio telephone also produces audio frequency aligning direction signal, produce a signal strength signal intensity indication by this, above-mentioned signal strength signal intensity indication is the function of receiving the function of the signal strength signal intensity of radiotelephone communication and receiving the transmitting power of radiotelephone communication.Therefore, along with the increase of transmitting power, for example, the amount of inserting man-made noise also increases, and prompting is aimed at antenna direction again so that can use the transmitting power of reduction by this.
The present invention points out the user to aim at wireless telephonic antenna direction again so that obtain higher reception by audio frequency man-made noise signal is inserted the audio frequency radiotelephone communication.Can point out the user before reaching audio frequency deterioration communication, to aim at antenna direction again, improved mobile radiotelephone communication is provided by this.
According to mobile radiotelephone of the present invention, comprising: the mobile radiotelephone antenna; Be used for the device that receives radio signals via above-mentioned mobile radiotelephone antenna; Be used to respond above-mentioned receiving system, conversion receives that radio signal is the device of audio frequency radio signal; Described conversion equipment comprises the device that is used for from the radio signal deletion noise that receives, and the device that produces the estimation of the noise of deleting from the radio signal that receives; Be used to respond above-mentioned receiving system, audio frequency aligning direction signal is inserted the device of audio frequency radio signal, point out wireless telephone user by this and improve aligning direction with respect to the radio signal of receiving so that aim at above-mentioned aerial for radio telephone again, described insertion device comprises the device that the described generation of response is estimated, be used to produce device as the audio frequency registration signal of the function of estimating, and the device that is used for the audio frequency registration signal is inserted the audio frequency radio signal
The accompanying drawing summary
Fig. 1 is a block diagram that can be used for mobile radiotelephone of the present invention.
Fig. 2 is the block diagram of a receiving digital signals processor (DSP), and it produces according to aligning direction signal of the present invention.
Fig. 3 has illustrated the work that produces first aligning direction signal according to the present invention.
Fig. 4 has illustrated the work that produces second aligning direction signal according to the present invention.
Fig. 5 is a block diagram of handling to receive signal according to second embodiment of the present invention.
Fig. 6 is a block diagram according to the demodulator of second embodiment of the present invention.
The preferred embodiment detailed Description Of The Invention
After this will more at large describe the present invention with reference to accompanying drawing, the preferred embodiments of the invention are shown in the drawings.Yet, also can realize the present invention and should not release only being limited to the embodiment that proposes herein with many different forms.Otherwise it is for content disclosed herein is comprehensive and perfect more that these embodiments are provided, and will express scope of the present invention to those skilled in the art person all sidedly.All same numberings refer to same unit in institute's drawings attached.
Referring now to Fig. 1, it shows the functional-block diagram that can be used for mobile radiotelephone of the present invention.Mobile radiotelephone 100 can be vehicle-mounted mobile radiotelephone, but hand-held mobile radio phone preferably.Mobile radiotelephone 100 generally receives radiotelephone communication from the satellite (not shown) of ground base station 155 or injection.Fig. 1 is the reduced representation of bimodulus cellular radio, at common inventor Paul W.Dent and Bjorn Ekelund and authorize U.S. patent application serial number No.07/967 to this agent parent company, 027, be entitled as and more at large described above-mentioned bimodulus cellular radio in " multimode signal processing ", the content of announcing is incited somebody to action combination in view of the above as a reference herein.
In brief, the function of antenna 145, radio receiving-transmitting unit 140 and receiving digital signals processor (DSP) 125 is as the device that is used to receive radiotelephone communication 150.Receive DSP125 and handle the signal of receiving from radio receiving-transmitting unit via dsp interface 135, and its generation can be loaded on speech coder 115 so that send digital audio signal by acoustic frequency sensor (for example loud speaker 110).Send DSP120 and receive, and it produces this signal and sends to dsp interface by radio receiving-transmitting unit 140 and antenna 145 via the digital voice signal of speech coder 115 from microphone 105.Some of microcontroller 130 control mobile radiotelephones 100 or all devices.The design of mobile radiotelephone 100 is well-known to those skilled in the art person, needn't at large describe at this.
Be embodied as one the pick of of the present invention and receive upward executable stored program of DSP125, for example above-mentioned reception DSP125 can be Texas instrument C53 digital signal processor (Texas Instruments C53 DSP).Yet, also can realize the present invention or partly realize as executable stored program on microcontroller 130 or another processor.Selectively, can use the logical design of customization or the combination of software and hardware.In the artificial antenna telephone system, can use analogue device.
Referring now to Fig. 2, will the block diagram of the reception DSP125 of Fig. 1 of configuration according to the present invention be described.Just as shown in Figure 2, receive DSP125 and comprise signal of communication generation device 210, said apparatus 210 produces digital received radio communication (speech) signal 250 according to the radiotelephone communication of receiving from dsp interface 135.Signal of communication 250 is loaded on speech coder 115 so that be converted into analog signal, provide above-mentioned analog signal to loud speaker 110 so that produce the audio frequency radiotelephone communication.Signal of communication generation device 210 can comprise that digital speech decoding and error correction are so that use the known technology of those skilled in the art person to produce the receiver of sharp cut-off.In this type of coded digital system, when radiotelephone communication receives that the intensity of signal is on first thresholding, produce the audio frequency radiotelephone communication signals, and when the intensity of receiving signal is in first thresholding under the time, inhibition audio frequency radiotelephone communication signals.
Still with reference to Fig. 2, receive DSP125 and also comprise aligning direction signal generation device 220.Aligning direction signal generation device 220 can receive the indication of having received signal to noise ratio from dsp interface 135.As this professional skill field personnel understood, radio receiving-transmitting unit 140 can produce the index signal of having received signal strength signal intensity.Perhaps, receiving DSP125 or microcontroller 130 can be according to receiving that radio communication produces the index signal of having received signal strength signal intensity.The generation of having received the index signal of signal strength signal intensity is well-known and needn't describes further the personnel of this professional skill field.Aligning direction signal generation device 220 produces aligning direction signal or alarm signal 240, and it is the function of receiving signal strength signal intensity of radiotelephone communication signals.
Receive that by merge numeral at summer 230 places wireless communication signals 250 and aligning direction signal 240 insert the audio frequency wireless communication signals to aligning direction signal 240.Summer 230 generations offer speech coder 115 and reach the combined signal 260 of broadcasting via loud speaker 110 so that be converted into analog signal.Be understandable that unnecessary merging wireless communication signals 250 and aligning direction signal 250, yet, provide above-mentioned wireless communication signals 250 and aligning direction signal 240 so respectively to one or more loud speaker or earphone 110 as long as audio frequency aligning direction signal is inserted the audio frequency radiotelephone communication.In the embodiment of Fig. 2, aligning direction signal processing apparatus 220 and summer 230 have constituted the audio frequency aligning direction signal that is used for being the function of aerial for radio telephone directivity and have inserted the insertion device of audio frequency radiotelephone communication.Acoustic frequency sensor device such as loud speaker 110 and speech coder 115, their responses receive digital processing 125 and merge the sound signal of receiving radiotelephone communication signals 250 and aligning direction signal 240 so that the audio frequency radiotelephone communication is inserted in the indication of sound signal intensity so that produce.
Referring now to Fig. 3, use description to produce the work of first embodiment of aligning direction signal (square frame 220 of Fig. 2) below.Specifically, at square frame 310 places, produce an increase signal of receiving signal intensity function as reduction.At square frame 320 places, produce and in proportion or amplify an artificial noise signal by the signal that produces at square frame 310 places.Therefore, produce its amplitude and receive the man-made noise of the increase of signal intensity function, the artificial indication that provides the signal strength signal intensity gradual change to worsen in view of the above as reduction.At square frame 330 places, the man-made noise that has amplified is inserted the audio frequency radiotelephone communication.
The broadband noise that the understandable man-made noise signal of those skilled in the art person can be white noise, pink noise or any other type, it perhaps can be the noise of single frequency or a plurality of frequencies, for example sinusoidal noise or a plurality of sinusoidal noise, their amplitude increases or reduces with the reduction of receiving signal strength signal intensity.The audio frequency indication of preferably selecting to increase with signal intensity has the characteristic of " comfort ", music tonic chord sound for example, yet, will have the characteristic of " discomfort ", for example white noise or incongruous sound with the audio frequency indication that worsens signal and increase.In the digital system of the cut-off threshold that provides the communication of being lower than to stop, the man-made noise signal becomes audio frequency and become stronger when receiving that signal strength signal intensity has surpassed thresholding when being preferably on the thresholding, time prompting user aims at the aerial for radio telephone direction again so that recover communication and be lower than thresholding.
Referring now to Fig. 4, second embodiment of the generation aligning direction signal 220 of Fig. 2 will be described below.At square frame 410 places, produce first and receive the increase signal of signal intensity function, as described in conjunction with square frame 310 as reduction.At square frame 420 places, produce second signal that increases as the function that increases transmitting power.
Those skilled in the art person is understandable in the mobile radio telephone system of having used automatic transmitting power control, base station 155 (Fig. 1) or satellite response mobile radiotelephone 100 is being received the indication that is lower than desired signal intensity so that increase its transmitting power, and its response mobile radiotelephone 100 is receiving that indication greater than desired signal intensity is so that reduce its transmitting power.According to the present invention, provide the indication of base station or satellites transmits power at sending direction by the down link of the radiotelephone communication 150 that mobile radiotelephone received.Therefore, at square frame 220 places, produce second signal that increases as coming automatic network to increase the function of transmitting power.Therefore, come the FEEDBACK CONTROL audio frequency indication prompting user of automatic network to aim at its antenna direction again so that improvement or up link or down link.
Continue the description of Fig. 4,, merge first and second signal so that produce the 3rd signal that changes as the function of first and second signal at square frame 430 places.For example, the 3rd signal will be received the function of signal strength signal intensity and increase as reduction, and it also increases as the function that increases transmitting power.Therefore, when increasing generation power, the aligning direction signal will increase points out the user to aim at antenna direction again so that transmitter can produce lower transmitting power.At square frame 440 places, produce the aligning direction signal.At square frame 440 places, the man-made noise signal is periodic signal, for example sine wave or clatter (Click), and its frequency is based on the value of the 3rd signal and changes.Therefore, the man-made noise signal of above-mentioned variable frequency provides tuning indication, for example, and signal strength signal intensity that wherein higher frequency representation is lower and higher transmitting power.At square frame 450 places, man-made noise is inserted radiotelephone communication.
Therefore, the present invention has produced an audio frequency aligning direction signal, this audio frequency aligning direction signal is the function of the directivity of aerial for radio telephone (also may be the transmitting power of base station or satellite), and the aerial for radio telephone that its expression receives radiotelephone communication is aligning direction or does not have aligning direction.Point out direction that the user aims at antenna again so that the aligning direction signal reduces subsequently.The invention provides that the comfort that can be used in analogue system worsens indication so that provided comfort to worsen indicating device before the real system noise begins to insert, and the present invention also provide can be used in the digital system that adopts coding in case indication be about near or passed through cut-off threshold.The prompting user aims at the direction of antenna again and recovers high-quality signal.
Referring now to Fig. 5, second embodiment of the present invention has been described.Fig. 5 has illustrated that received signal is handled or in radio telephone or the different layouts of the block diagram in transmitter (ground base station or satellite).Fig. 5 is the function distribution figure corresponding to the hardware arrangement of Fig. 1.
According to authorizing Dent to the associating inventor, the U.S. patent application serial number No.08/305 that submits on September 14th, 1994,727, be entitled as " channel is equalizing device independently ", can carry out demodulation and error-correcting decoding by maximum-likelihood sequence estimator, the content of its announcement is incorporated into herein as a reference in view of the above.With reference to figure 6, Viterbi sequence maximum-likelihood sequence estimator comprises that being used to store a plurality of hypothesis has received the status register 65 of symbol sebolic addressing with the path metrics of each expression cumulative probability.Processing comprises uses transmitter module 60, and above-mentioned transmitter module 60 can comprise the model that is called the resulting propagation channel of known bits sequence of training sequence or symbol numeral according to processing.In the reference vector battle array of status register, realized the latter's information.
Transmitter model 60 calculates the signal value of expection, and the signal value of above-mentioned expection is supposed corresponding to the preceding new bit of really supposing on the basis that once is assumed to be in each round.The signal value of expection is in comparator 61 and receive that the signal value comparison is so that obtain difference.Difference is hypothesis and the actual error measure of receiving between the signal sample, and wherein above-mentioned mistake only is owing to supposing that radio noise causes under the correct situation.Increase the mismatch indication to corresponding to a preceding path metric of testing hypothesis so that obtain a new accumulation mismatch or a path metric.
Adder 62 has constituted the new route tolerance that equals the binary zero state at current hypothesis memory Far Left bit from containing, and this moment, adder 64 constituted the new route tolerance that the above-mentioned memory Far Left bit position that is used for corresponding current hypothesis is a binary one.Two new path metrics of comparator comparison and select the junior of correlation behavior memory and all content corresponding so that adopt moving to left (according to the state of given low path tolerance, it may be 0 or may be 1) and enter the treated part of memory and become the fresh content of status register from the Far Left bit of current hypothesis.Adopt " 0 " and " 1 " both as the hypothesis of new bit all is precedingly once supposed so that test, and after having handled all hypothesis, remaining amount of state will be with former identical, and then will to upgrade all path metrics be the junior of two comparison measurings and the decoding that advances a symbol.
The work of Fig. 6 has more at large been described in conjunction with present patent application.Foregoing description can be revised so that the indication of tuned noise is provided according to embodiment of the present invention.
As the description of front, comparator 61 calculates hypothesis signal value and the actual difference of receiving between the signal value, and above-mentioned difference is owing to supposing that signal value is to have only radio noise to cause under the genuine situation.Be not the difference that abandons aforementioned calculation, but embodiment of the present invention write down each data symbol of the processing section of difference and status register together.When error correction coding produces the several sample value that has sent of each original data bits that be about to send, transmitter model 60 will similarly produce the several signal samples and the comparator 61 that are used for comparison will test above-mentioned a plurality of sample value so that obtain several differences.These differences merge according to quadratic sum usually so that obtained the mismatch indication before abandoning.
According to embodiment of the present invention, difference is stored in status register 65 corresponding to each bit decision of having handled.When selecting one of two hypothesis that compared to be used as the survivor, allow to cover the saved differences of another state from the saved differences of a state by the Viterbi method.The final bit decision of being carried out by Viterbi MLSE processor is to make squared difference and minimum bit.Therefore, Yu Xia error may be owing to be that radio noise rather than incorrect bit decision cause.The radio noise that the difference of therefore, having stored equals to receive and can export sound decorder 510 to.Speech coder 510 can increase the radio noise sample value to sound signal so that the user will hear the accurate expression of the radio noise characteristic that changes pari passu with signal to noise ratio rather than by the sharp cut-off thresholding of decode procedure.
Adopt the digital cordless phones of digitization of speech signals often not only to insert error detection coding but also inserted error correction coding, for example, in the digital speech transmission of being everlasting, add cyclic redundancy check (CRC) code (CRC) to the most responsive important bit.When CRC check is failed, prevent that by various similarly known " going belch " error covering strategies error bit from causing unwanted audio frequency artifacts.When the CRC failure reached 5% time quantum, this type of went the belch technology can maintain the voice quality of usefulness.Can be used for triggering for CRC failure detection and automatically add the indication of sound signal quality to phone output and take correct operation so that cause the user more than 5% time quantum.
Above-described embodiment has illustrated can be on principle to be extracted the noise that approaches real radio noise arbitrarily the decode procedure and represents and introduce sound signal again artificially so that provide and rise or the real indication of dropping signal quality that they are independent of the threshold performance of demodulator from separating to be in harmonious proportion.
The audio frequency indication that provides the signal quality that rises or descend in the mode that increases the weight of that may need with respect to signal to noise ratio.What for example, may need is the minimizing that represent signal to noise ratio 1dB to the user by 3dB or the 6dB with the indication of the audio frequency of artificial increase.Employing measures or selectively adopts the radio noise waveform of having stored can realize foregoing from the store path of decode procedure.The path metric direct proportion is in the average of radio noise square and can be used for according to radio noise or positively determine the audio frequency indication in proportion according to any power of radio noise level.
Reduce the complexity of demodulator and decode procedure if desired, the indication of the audio frequency of decision can be the audio frequency waveform of a pre-stored in proportion so by this.Just as previously described, when representing the signal quality that is descending, can select this kind waveform is " uncomfortable " sound.Otherwise, when inverse proportion decision during, can use " comfortable " waveform promptly divided by the power power of path metric, master music chord for example is so that its intensity increases with the signal quality that is rising.Also can use uncomfortable sound that increases with noise level and this both combination of comfortable sound that increases with the signal level, but when " the tuning indication of audio frequency " that the user has selected to be about to enable, at least " comfortable " sound should be audio frequency in case be not the voice conversation of better signal to noise ratio during can prevent that it from causing and take sb's mind off sth.
Network selectively or additionally can send as described previously command messages to controller 130 so that remotely open or close the audio frequency indication so that redirect antenna direction.Can be by network or based on the measured signal strength signal intensity of mobile phone and send as to the signal strength signal intensity report of network or can receiver Network Based receive that signal strength signal intensity that the transmission of mobile phone is measured or the two make up and issue this kind order.
What also may need is that audio frequency tone represents that to the user signal quality is not in talking state, and this moment, its phone was received signal bursts periodically on talk channel.For save the power of battery, just mobile phone is not to receive continuously but only allocate in advance to being called under the sleep pattern of each mobile unit herein at network and wake up in idle mode.For example, this may occur according to the interval of having only 1 second (s).Network knows when mobile receiver will be in the state that wakes and the call-reminding of giving receiver only just sends in the above-mentioned time.According to the interval of having only 1 second (s) adopt the signal receive may be too slow a bit so that can not provide the signal quality of the idle condition of optimizing by the portable antenna position to indicate to the user.If necessary, can require the user by enable the audio frequency indication by next key, when phone was in idle pulley, the above-mentioned bond energy of pressing enough temporarily made receiver work continually so that measure the signal strength signal intensity that is used to be intended to be to aim at antenna direction continuously or at least enough.
When not being in talking state, providing the audio frequency indication of various " comforts " not have weak point, for example above-mentioned various comforts can be with improving music drone the sound (Hum) that signal quality intensity rises.The instruction that can abridge subsequently and " be used for maximum drone father-in-law's sound aligning " in equipment user's handbook, it is the instruction that the user is easy to follow.Different " drone sounds " can be provided, depend on the characteristic of the network station that phone locks, for example, when telephone lock due to based on the cellular system on land the time, one " drone sound at interval ".
Reach detailed description with reference to the accompanying drawings, typical preferred embodiment of the present invention is disclosed, although adopted specific term, be to use them to have general and describing significance rather than purpose in order to limit, the scope that the present invention proposes will be in following claim.
Claims (11)
1. mobile radiotelephone comprises:
The mobile radiotelephone antenna;
Be used for the device that receives radio signals via above-mentioned mobile radiotelephone antenna;
Be used to respond above-mentioned receiving system, conversion receives that radio signal is the device of audio frequency radio signal; Described conversion equipment comprises the device that is used for from the radio signal erased noise that receives, and the noise of deleting from the radio signal that receives is produced the device of estimating; With
Be used to respond above-mentioned receiving system, audio frequency aligning direction signal is inserted the device of audio frequency radio signal, point out wireless telephone user by this and improve aligning direction with respect to the radio signal of receiving so that aim at above-mentioned aerial for radio telephone again, described insertion device comprises the device that the described generation of response is estimated, be used to produce device as the audio frequency aligning direction signal of the function of estimating, and the device that is used for audio frequency aligning direction signal is inserted the audio frequency radio signal.
2. according to the mobile radiotelephone of claim 1, it is characterized in that wherein above-mentioned insertion device comprises the device that is used for man-made noise is inserted the audio frequency radio signal, above-mentioned man-made noise is as the function of the antenna direction of mobile radiotelephone.
3. according to the mobile radiotelephone of claim 1, it is characterized in that, wherein above-mentioned insertion device comprises the device that is used for man-made noise is inserted the audio frequency radio signal, and the amplitude of above-mentioned man-made noise is estimated to increase according to increasing progressively of the noise of deleting from the radio signal that receives.
4. according to the mobile radiotelephone of claim 1, it is characterized in that, wherein above-mentioned insertion device comprises the device that is used for the periodicity man-made noise is inserted the audio frequency radio signal, and the increase of the cycle of above-mentioned man-made noise according to the estimation of the noise of deleting from the radio signal that receives changes.
5. according to the mobile radiotelephone of claim 1, it is characterized in that, wherein above-mentioned insertion device responds the transmitting power index signal of being received by above-mentioned receiving system further, it is used to insert the aligning direction signal, and above-mentioned aligning direction signal is the function of the transmitting power of the radio signal that receives.
6. according to the mobile radiotelephone of claim 1, it is characterized in that the device that wherein above-mentioned generation is estimated comprises an error correcting deocder that contains the path metric device.
7. according to the mobile radiotelephone of claim 6, it is characterized in that the device that wherein above-mentioned generation is estimated comprises a Viterbi sequence maximum-likelihood sequence estimator.
8. according to the mobile radiotelephone of claim 1, it is characterized in that the device that wherein above-mentioned generation is estimated comprises:
Be used to respond above-mentioned receiving system, calculate the device of expection radio signal;
Response aforementioned calculation device, relatively expect radio signal with receive radio signal so that obtain the device of expecting radio signal and receiving difference between the radio signal; And
Be used to respond above-mentioned comparison means, produce device based on the error signal of resultant difference.
9. according to the mobile radiotelephone of claim 1, it is characterized in that, the wherein above-mentioned radio signal of receiving comprises cyclic redundancy check (CRC), and above-mentioned insertion device comprises that being used for one is the device that the audio frequency aligning direction signal of the function of cyclic redundancy check (CRC) failure inserts the radio signal that receives.
10. according to the mobile radiotelephone of claim 1, it is characterized in that, wherein above-mentioned insertion device comprises that being used for inserting one is the device of signal of audio frequency comfort of the function of the Noise Estimation of successively decreasing of deleting from the radio signal that receives, and to be used for inserting one be the device of audio frequency discomfort signal of the function of the Noise Estimation that increases progressively of deleting from the radio signal that receives.
11. the mobile radiotelephone according to claim 1 is characterized in that, wherein above-mentioned conversion equipment comprises:
Be used to respond above-mentioned delete device, detect above-mentioned delete device can not be from the radio signal of receiving the Error Detection Unit of erased noise;
Be used to respond above-mentioned Error Detection Unit, be buried in the error concealment device of the noise effect that does not have deletion in the radio signal of receiving;
Wherein above-mentioned insertion device also responds above-mentioned Error Detection Unit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61549796A | 1996-03-12 | 1996-03-12 | |
| US08/615,497 | 1996-03-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1213471A CN1213471A (en) | 1999-04-07 |
| CN1135755C true CN1135755C (en) | 2004-01-21 |
Family
ID=24465640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB97193004XA Expired - Fee Related CN1135755C (en) | 1996-03-12 | 1997-03-07 | Method and apparatus for antenna realignement in mobile radiotelephone using injected audio signal |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0895678A2 (en) |
| JP (1) | JP2000506699A (en) |
| KR (1) | KR100349192B1 (en) |
| CN (1) | CN1135755C (en) |
| AU (1) | AU722052B2 (en) |
| BR (1) | BR9708051A (en) |
| WO (1) | WO1997034381A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102884728A (en) * | 2010-04-09 | 2013-01-16 | 哈里公司 | Simulated degradation of SNR in decoded digital audio correlated to wireless link bit-error rate |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6411826B1 (en) * | 1998-11-17 | 2002-06-25 | Ericsson Inc. | Portable radiotelephones including patch antennas having openings therein |
| JP3691365B2 (en) * | 2000-08-23 | 2005-09-07 | 三洋電機株式会社 | Digital broadcast receiver |
| GB0104282D0 (en) * | 2001-02-21 | 2001-04-11 | Cambridge Silicon Radio Ltd | Communication system |
| EP1649683A1 (en) * | 2003-07-21 | 2006-04-26 | Koninklijke Philips Electronics N.V. | Image alignment |
| KR101632648B1 (en) * | 2011-10-19 | 2016-06-22 | 엠파이어 테크놀로지 디벨롭먼트 엘엘씨 | Changing the orientation of a user based at least in part on transmit power |
| US9037164B2 (en) | 2011-10-19 | 2015-05-19 | Empire Technology Development Llc | Changing the orientation of a user based at least in part on transmit power |
| CN102546513B (en) * | 2012-01-20 | 2014-09-24 | 清华大学 | Method and system for designing time domain man-made noises in orthogonal frequency division multiplexing system |
| KR101669354B1 (en) * | 2015-01-26 | 2016-11-09 | 한국과학기술원 | Apparatus and Method for compensation the position of the antenna in communication with the orbital angular momentum |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4020694A1 (en) * | 1990-06-29 | 1992-01-02 | Philips Patentverwaltung | RADIO RECEIVER WITH ACOUSTIC SIGNAL |
| US5327457A (en) * | 1991-09-13 | 1994-07-05 | Motorola, Inc. | Operation indicative background noise in a digital receiver |
| US5257408A (en) * | 1992-04-30 | 1993-10-26 | Motorola, Inc. | Method for seeking a communication system |
| JPH0832508A (en) * | 1994-07-19 | 1996-02-02 | Kokusai Electric Co Ltd | Digital mobile radio equipment, digital mobile radio reception method and digital mobile radio transmission and reception method |
-
1997
- 1997-03-07 AU AU20716/97A patent/AU722052B2/en not_active Ceased
- 1997-03-07 BR BR9708051A patent/BR9708051A/en not_active IP Right Cessation
- 1997-03-07 EP EP97908929A patent/EP0895678A2/en not_active Withdrawn
- 1997-03-07 WO PCT/US1997/003558 patent/WO1997034381A2/en not_active Application Discontinuation
- 1997-03-07 JP JP9532694A patent/JP2000506699A/en not_active Ceased
- 1997-03-07 KR KR1019980707145A patent/KR100349192B1/en not_active IP Right Cessation
- 1997-03-07 CN CNB97193004XA patent/CN1135755C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102884728A (en) * | 2010-04-09 | 2013-01-16 | 哈里公司 | Simulated degradation of SNR in decoded digital audio correlated to wireless link bit-error rate |
| CN102884728B (en) * | 2010-04-09 | 2015-01-28 | 哈里公司 | Simulated degradation of SNR in decoded digital audio correlated to wireless link bit-error rate |
Also Published As
| Publication number | Publication date |
|---|---|
| AU722052B2 (en) | 2000-07-20 |
| KR100349192B1 (en) | 2002-12-26 |
| WO1997034381A2 (en) | 1997-09-18 |
| BR9708051A (en) | 1999-07-27 |
| AU2071697A (en) | 1997-10-01 |
| JP2000506699A (en) | 2000-05-30 |
| WO1997034381A3 (en) | 1997-11-06 |
| EP0895678A2 (en) | 1999-02-10 |
| CN1213471A (en) | 1999-04-07 |
| KR19990087680A (en) | 1999-12-27 |
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