CN1349686A - Method and apparatus for adaptively selecting a soft symbol - Google Patents
Method and apparatus for adaptively selecting a soft symbol Download PDFInfo
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- CN1349686A CN1349686A CN00806613A CN00806613A CN1349686A CN 1349686 A CN1349686 A CN 1349686A CN 00806613 A CN00806613 A CN 00806613A CN 00806613 A CN00806613 A CN 00806613A CN 1349686 A CN1349686 A CN 1349686A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/204—Multiple access
- H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability
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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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70707—Efficiency-related aspects
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Abstract
A method of selecting a soft symbol for a subsequent operation in a communication device is disclosed. In one embodiment, a signal is received at the communication device. Next, the signal is demodulated. Then, a strength level such as a signal to noise ratio Eb/Nt is determined. Based upon the strength level determined for the signal stored in a register, a location of bits around the average amplitude of the signal is determined for representing the soft symbol in a subsequent operation. The strength level and the location of bits is adaptively updated for the signal over time.
Description
Technical field
The disclosure relates to digital communicating field.Specifically, the disclosure relates to a kind of adaptively selected apparatus and method that are used for the soft symbol of subsequent operation.Wherein said subsequent operation for example is the decode operation in the communication equipment.The disclosure has been described a kind of adaptively selected method that is used for the soft symbol of subsequent operation of communication equipment that is.
Background of invention
Radio communication is to the equipment infiltration of the form of ownership that uses information, for example, and cell phone, network, PDA(Personal Digital Assistant), digital camera etc.A kind of form that is called as code division multiple access (CDMA) spread spectrum form is arranged in the radio communication, and it is one of the most frequently used wireless technology.Because growth of requirement and resource is limited, the Wireless Telecom Equipment of raising and the fidelity of system and necessity of performance have been arranged.
With reference to prior art shown in Figure 1, it has provided a traditional base station 104, as sub-district and a mobile unit 102, as cell phone.Cdma system adopts common bandwidth to a plurality of users, transmission pilot signal and data-signal 106 between base station 104 and mobile unit 102.Therefore, described bandwidth is taken by many combined signals; And primary signal may arrive destination device by various path, and therefore forms various forms of delays and phase shift.These never are called as multipath signal with the signal that the path is come, because these multipath signals can have sizable difference aspect signal strength signal intensity and other performance factor, therefore the method that needs the signal that a kind of suitable estimation receives is it is treated to significant data, as speech data.
A kind of traditional configuration only identifies the bit of binding signal fixed position or part, is used for subsequent decoding.Usually, receive under the situations at many different signals, the bit of fixed position that all can select binding signal is as its overall performance.But this prior art arrangement receives in the occasion at these different various signals, obtains nominal performance usually; And the standing part of this binding signal is normally just identified in the design phase of hardware and software, enrolls then among the program of phone.So a phone may all be restricted to this standing part of binding signal in its whole life-span.Therefore, the bit that needs a kind of method to overcome from binding signal, to select the fixed position on the prior art limitation that is used to decode.
In sum, be necessary to improve the fidelity and the performance of Wireless Telecom Equipment and system.And, need a kind of method appropriately to estimate the signal that receives, it is treated to significant data, for example, speech data.At last, need a kind of method to overcome the relevant limitation that the bit of selection fixed position is used to decode from binding signal on the prior art.
Summary of the invention
The disclosure has been described a kind of be used to the improve fidelity of digital communication equipment and system and the method and apparatus of performance.Specifically, the disclosure has described that a kind of appropriate estimation receives is used to be processed into method such as the meaningful data of speech data.At last, the disclosure has been described a kind of method that is used for the limitation of subsequent operation in the prior art about the bit from binding signal selection fixed position that overcomes.
Specifically, a disclosed embodiment provides the adaptively selected method that is used for the soft symbol of subsequent operation in communication equipment.In one embodiment, in the communication equipment received signal.Then, signal is carried out demodulation.Then, definite intensity such as signal to noise ratio Eb/Nt.At last, according to the signal strength signal intensity of determining, be identified for the position or the continuous sequence of the signal bit of subsequent operation.The position of signal strength signal intensity and bit will be in time by adaptive updates.Should be appreciated that, Eb/Nt be every bit in conjunction with the ratio of energy with the effective noise power spectrum density, this is known to those of skill in the art.
In another disclosed embodiment, in a kind of communication equipment, realize above-mentioned method, described communication equipment comprises for example processor, the memory of general processor, separates many through receiver and digital signal processor (DSP).Specifically, the memory portion of communication equipment has data and program command, and when carrying out by processor, they realize said method: promptly in communication equipment, and the adaptively selected soft symbol that is used for subsequent operation from composite signal.This bit selection course provides a very little space (head room), and this scheme is impelled source (origin) more high-resolution (resolution) on every side, and makes the large-signal amplitude saturated.This process is feasible, because under big amplitude situation, signal is unlikely by incorrect decoding, does not therefore need high-resolution under these signal amplitudes.
For those of ordinary skill in the art, after running through following detailed description to the most preferred embodiment shown in each accompanying drawing, it is obvious that these and other objects of describing in the disclosure and advantage will become.
Description of drawings
Be combined in this specification and constitute the disclosed embodiment of description of drawings of this specification part, and be used for explaining the principle that the disclosure proposes with specification.Unless concrete indicating, the accompanying drawing of mentioning in this specification are interpreted as not being drawing in proportion.
Fig. 1 (prior art) is traditional base station and cellular view.
Fig. 2 A is the functional-block diagram according to the bit selection course of under other traffic operation situation signal being carried out of one embodiment of the present of invention.
Fig. 2 B is a detailed functional block diagram of selecting engine according to the bit of one embodiment of the invention.
Fig. 2 C is the detailed functional block diagram according to the preprocessing function of one embodiment of the invention.
Fig. 2 D is the detailed functional block diagram according to the post-processing function of one embodiment of the present of invention.
Fig. 3 is the hardware block diagram according to the communication equipment that is used for the bit selection course of a disclosed embodiment.
Fig. 4 is according to the signal performance of a disclosed embodiment and they the several exemplary situation to the corresponding influence of the bit of binding signal.
Fig. 5 is the adaptively selected for example flow chart of steps of the method for the soft symbol of the subsequent operation of decode operation that is used for of execution in communication equipment that is used for according to a disclosed embodiment.
The detailed description of invention
Now most preferred embodiment of the present invention is described in detail, its example is shown in the drawings.Although present invention is described in conjunction with most preferred embodiment, know that the present invention is not limited to these embodiment.On the contrary, the present invention includes substituting in the spirit and scope of the invention that defines in the appended claim book, modification and equivalents.And, in the detailed description of the present invention, set forth a large amount of specific detail below, so that provide to complete understanding of the present invention.But to those skilled in the art, obviously there are not these specific details can put into practice the present invention yet.Under other situation, well-known method, process, element and circuit are not described in detail, in order to avoid unnecessarily make aspect of the present invention not obvious.
According in computer or the digital system memory in data bit operating or the communication equipment program, logical block, processing and other symbolic representation of signal operation being introduced the some parts of detailed description then, for example handle.These descriptions and expression are that the technical staff in the digital communicating field is used for the means to the content of their work of the most effective reception and registration of other technical staff in described field.At this, program, logical block, processing etc. generally all are considered to cause want the step or the instruction of result's self-congruent sequence.These steps are those steps that require the physical operations of physical quantity.Usually, although not necessarily, the form of the signal of telecommunication or magnetic signal is taked in these physical operationss, wherein the signal of telecommunication or magnetic signal can in communication equipment or processor, store, transmit, in conjunction with, relatively or other operation.For simplicity, and contrast common usage, about the present invention, these signals become bit, value, element, symbol, character, item, numeral etc.
But should remember that all these terms all are interpreted as quoting physical operations and physical quantity, and only be consider this area Essential Terms and to explain make things convenient for mark.Unless lay special stress on, otherwise in the following discussion, run through of the present invention such as " reception ", " demodulation ", " determining ", " selection ", " combination ", the term of " taking advantage of " etc. refers to and handles and the communication equipment of transmission data or the similarly action and the process of electronic computing device.Data are expressed as physics (electronics) amount in the RS of communication equipment element or computer system, and are converted into the memory of communication equipment element or computer system and similar other data that are expressed as physical quantity in register or other such information-storing device, transmission or the display device.
Refer now to Fig. 2 A, shown in the figure according to the functional-block diagram 200 of the bit selection course of under other traffic operation situation, signal being carried out of one embodiment of the invention.In this programme, provide signal 240 such as communication equipment as base station 104, signal 240 can comprise pilot signal and/or data-signal.Data-signal is by handling such as cellular communication equipment, and its function is represented by the functional block shown in Fig. 2 A.But shown function also can be carried out by the communication equipment of many kinds, and these communication equipments comprise that base station, personal computer (PC), digital camera and other have the equipment of wireless communication ability.The present invention also is suitable for just developing in the radio communication various product that is used for bluetooth specification.
Communication equipment is carried out demodulation function 242 to signal.In one embodiment, if can be used for given application, then a plurality of possible many each in signal 242a are all carried out demodulation function.On function, be connected to the intensity of channel estimator functional block 244 estimated signal of demodulation block 242, for example estimate by each many intensity of demodulation through signal.Channel estimator function 244 can be determined signal strength signal intensity, such as signal to noise ratio Eb/Nt well known to those skilled in the art.But the present invention is suitable for determining the S meter of other any kind.Eb is the received energy of every bit of specification signal, and unit is a watt-second, and Nt is the received energy of every bit of noise in the described signal.
The combiner functional block 246 that is connected to demodulation block 242 among Fig. 2 A on the function add many through signal so that composite signal 246a to be provided.Although we's bright suitable use any signal configures, in the present embodiment, composite signal 246a is 24 2 a complement.Combiner function 246 can be managed by other algorithm and management system.The common unsettled U.S. Patent application No.60/172406 that being entitled as of people such as Gibong Jeong " is used to manage the method and apparatus of many fingers through signal " provides other details about described theme, and agency's file number of this application is VLSI-3509.This related application is commonly assigned, and is combined in this by reference.
The preprocessor functional block 248 that is connected to assembler block 246 on the function is carried out preprocessing function.Preprocessing function is that bit selection function piece is prepared composite signal 246a.The more detailed description of relevant preprocessor functional block 248 provides in Fig. 2 of back C.
The bit that is connected to preprocessor piece 248 and channel estimator block 244 on the function selects piece 250 adaptively selected or isolate the signal bit of right quantity for subsequent operation.In one embodiment, bit selects piece 250 only to select six bits of form composite signal partly to be used for the demodulation operation of back, " soft symbol " 250a that this six bit number is commonly called.But the present invention is suitable for selecting according to given application requirements any bit length part of signal.In the present embodiment, for example on same communication equipment, the specific six bit parts of the signal that the specific six bits part of the signal of selecting at a time point may be selected with another time point are different.Like this, the invention provides the adaptive bit selection function.These characteristics have overcome the limitation relevant with prior art, promptly soft symbol are fixed on the fixed bit position in the composite signal.Fig. 2 B provides the example standards that is used to determine to use which part of signal.
Being connected to bit on the function selects the preprocessor functional block 254 of piece 250 to carry out post-processing function.Post-processing function 254 is prepared soft symbol 250a for demodulation function.The more detailed description of relevant preprocessor functional block 254 is provided among Fig. 2 D of back.
The decoding function piece 256 that is connected to preprocessor functional block 254 on the function is carried out decoding function.Can utilize any method in the well-known several method of those skilled in the art to realize decoding function 256.A kind of like this decoder is Viterbi (Viterbi) decoder that is used for code division multiple access (CDMA) system.Though the present invention provides soft symbol for the decode operation self adaptation, yet the present invention also is suitable for providing soft symbol or some other bit sequence, is used for the operation of some other types of communication equipment.
Refer now to Fig. 2 B, shown in the figure according to the bit selection function piece of one embodiment of the present of invention or the detailed functional block diagram of engine.Bit selects engine 250 to receive many standards from interface 249.These standards will be used to determine to select which bit of signal to be used for subsequent treatment, for example decoding.In one embodiment, standard comprises signal strength signal intensity standard 260, temporary transient performance 262 and performance mode 264.Fig. 4 afterwards provides these standards may contrast the example of the influence that the elite process of selecting causes.But, the standard that the present invention also is suitable for using any combination of these standards or uses other type, the latter allows its adaptively selected requisite number purpose bit to be used for a plurality of any one operation of operation subsequently.
The interface 249 of appropriate value and classification provides corresponding bit position value to scaling function piece 251 then among matched and searched table (LUT) 252.According to application, bit position value 260 can have many different configurations.For example, position positional value 260 can be a scaled value, when multiply by composite signal 248a by conversion piece 251, isolates suitable bit range, and for example signal times is can reduce the size or the bit number of composite number less than 1 value.On the other hand, bit position value 260 can be used as the deviant of the bit number that removes from the LSB (least significant bit) of composite signal part of indicating.
Though the present embodiment among Fig. 2 B has used LUT, yet can use any kind or the method for corresponding data, for example sign etc.And, the present invention is applicable to also in a plurality of standards that are used for the bit selection function and adopts prioritisation scheme that is to say, one of them standard may have bigger weighting than other factors, for example, if it has bigger influence to signal in such as the subsequent operation of decoder.
With reference now to Fig. 2 C,, shown in the figure according to the detailed functional block diagram of the preprocessing function piece of one embodiment of the invention.Preliminary treatment can comprise a plurality of subfunctions.For example, in one embodiment, the processing of composite signal 246a is undertaken by following subfunction: a) by filter function 271; And b) format function 272.But preprocessor functional block 248 can be configured to provide more or less subfunction according to given application.Format function in the present embodiment removes one or more least significant bits (LSB).In the present embodiment, 8 least significant bits in the 24 bit composite signals are removed.And in another embodiment, do not use the preprocessor function.Preprocessor functional block 248 provides formatted signal 248a.
Refer now to Fig. 2 D, shown in the figure according to the detailed functional block diagram of the preprocessor functional block of one embodiment of the invention.Reprocessing can comprise a plurality of subfunctions.For example, in one embodiment, the processing of soft symbol signal 250a is undertaken by following subfunction: a) by filter function 276; B) format function 278; C) fixing point is to two point conversion 280, (also be called deinterleave (deinterleaver), go to hole (depuncture), go repetition (derepeat), round-up is six bit numbers then); And d) Z-transformation (also being called delay operator) 282.In the Z present embodiment, format function removes the non-integer part of signal, and therefore the integer part of signal is provided.
Although present embodiment provides the subfunction of specific quantity and type, yet according to given application, preprocessor functional block 254 can be configured to provide the subfunction of varying number or type.And, in another embodiment, do not use post-processing function.Therefore preprocessor functional block 250 provides format soft symbol 254a.Described bit selection course provides a very little space, and makes the large-signal amplitude saturated.This process is feasible, because during big amplitude, signal is unlikely by incorrect decoding, does not therefore need high-resolution under these signal amplitudes.More high-resolution around this scheme is impelled in the source, and make the large-signal amplitude saturated.
Refer now to Fig. 3, shown in the figure according to the hardware block diagram of the communication equipment that is used for the bit selection course of one embodiment of the invention.Communication equipment 300 among Fig. 3 can be an independently unit, such as cell phone.But it also may be parts of main equipment, such as printer, computer, camera, PDA(Personal Digital Assistant) etc.Be appreciated that the present invention is suitable for handling any equipment of the wireless data of suitable configuration.
Communication equipment 300c comprises interconnected firmware/software piece 310 and application-specific IC (ASIC) piece 320.ASIC piece 320 comprises antenna 303, transceiver 304 and RAKE (separating many warps) receiver 326.Antenna 303 links to each other with transceiver 304, and transceiver 304 is connected to RAKE receiver 326 again.In the present embodiment, RAKE receiver 326 comprises three independently fingers (finger): finger 1321, finger 2322, finger 3323.Each finger carries out demodulation to the many of independent distribution through signal.
Firmware/software piece 310 comprises processor 314 (for example general processor), memory 316 and digital signal processor (DSP) 317, and they are connected to each other by bus 302.Data and/or program command can be stored in memory 316 and logical processor 314 or digital signal processor 317 and carry out, and relate to other parts of communication equipment 300, comprise the parts (not shown) that those skilled in the art are known.The memory 316 of present embodiment can comprise such as the permanent memory of read-only memory (ROM) with such as the temporary storage of random asccess memory (RAM).The ROM memory can be used for storing the data of permanent function in the service-specific module, and the RAM memory can be used for storing the relevant data of on-the-spot media services data.What memory 316 can comprise other type can store memory of data, such as hard disk drive, CD-ROM or flash memory.Can the design point machine carry out the instruction of request, to replace using the memory storage instruction.
Although present embodiment illustrates three fingers, yet the present invention is suitable for using any amount of finger in RAKE receiver.In addition, the present invention can comprise than the more or less parts shown in the communication equipment 300 of present embodiment.Communication equipment 300 can be used for the functional block of execution graph 2A and Fig. 2 B.For example, in one embodiment, demodulation function 242 can be finished by transceiver 304 and RAKE receiver 326 parts of ASIC 320.On the other hand, demodulation function also can be realized by the firmware/software part 310 in the communication equipment.In another example, preprocessing function 248, bit selection function 250 and post-processing function 254 can be realized by the firmware/software part 310 in the communication equipment 300.But they also can realize in the ASIC design.
Refer now to Fig. 4, shown in the figure according to the signal performance of one embodiment of the invention and they several exemplary case to the influence of the bit of binding signal.At first will describe figure 400, then composite signal 246a will be discussed, will describe the reciprocation between these two entities at last.
The ordinate of figure 400 is a signal amplitude 402, and abscissa is the time 404.Signal amplitude can representation signal power or signal to noise ratio, such as Eb/Nt.Fig. 4 shows three kinds of situations of signal performance.Every kind of situation have again three independent many through signal, for example about the signal of each finger demodulator of three finger demodulators shown in Fig. 3.Case 1411 among Fig. 4 is groupings of three signals, and big amplitude 408 is arranged all.This expression has the strong direct signal path from a communication equipment to another communication equipment.Case 2412 is groupings of three signals, and small magnitude 410 is arranged all, and this is the weak signal between the communication equipment or the expression of extended distance.At last, case 3413 is groupings of three signals, and wherein two is that 408, one of big amplitudes are to reduce to the fading signal 413a of small magnitude by a period of time from big amplitude 408.
Composite signal 246a is a digital binary number, many intensity through signal that its representative increases.Although signal can have the bit of random length, yet in the present embodiment, composite signal is made up of 24 bits.Highest significant position (MSB) is at the high order end of numeric string.On the contrary, least significant bit (LSB) is at the low order end of numeric string.Decimal point may be in any position of numeric string, so that form a real number.For case 1411, the variation that big amplitude 408 and the little variation by each signal after a period of time mean most composite signal 246a all will be near the bit of MSB 440, so the soft symbol 1451 of six bits will be more suitably the representing of variation of signal amplitude in the case 1411.And the variation of signal is to provide meaning to change in output signal, as word or other data.That is to say that zero of signal changes with equaling monotone, it represents negligible substantially data.
For case 2412, small magnitude 410 and mean that by the variation that each signal is little after a period of time the variation of most composite signal will be than near the bit of LSB 422.So the soft symbol 2452 of six bits will be the more suitable expression of variation of the signal amplitude of case 2412.For the situation of case 3413, wherein the big amplitude performance of two signals means that most signal important change all will be near the bit of MSB 440, but the decline intensity of signal 413a may be regulated the position of soft symbol slightly to LSB 442 directions.The specific selection of bit is depended on specific situation, specific signal specification requirement, specific application and specific dummy level (level) and is used to the analysis of the situation of assessing.The present invention is suitable for adapting to all these specific situations, selects the extensive configuration or the step of partial bit from signal adaptive so that be provided for subsequent operation.
Fig. 5 is the flow chart of steps of method that is used in communication equipment carrying out the adaptively selected soft symbol that is used for the subsequent decoding operation according to a disclosed embodiment.Flow chart 5000 can be realized by the functional block of Fig. 2 A or 2B and the hardware block diagram of Fig. 3.The result of flowchart 5000 is by the exemplary signal case explanation of Fig. 4.
In the step 5003 of present embodiment, signal is carried out demodulation.In one embodiment, utilize the demodulation function piece 242 of Fig. 2 or utilize the transceiver 304 of Fig. 3 and RAKE receiver 326 to come performing step 5003.Demodulation makes can catch data-signal from carrier signal.After the step 5003, flow chart 5000 proceeds to step 5004.
In the step 5004 of present embodiment, determine the intensity of signal.This intensity can be simple intensity, or such as the signal to noise ratio 5004a of Eb/Nt.And, can follow the trail of performance with variable by the signal of a period of time 5004b, for example, provide average signal strength by a period of time.Step 5004 can utilize channel estimator function 244 to realize that channel estimator function 244 can realize itself in the firmware/software piece 310 of Fig. 3.After the step 5004, flow chart 5000 proceeds to step 5006.
In the step 5006 of present embodiment, all experienced the combined formation composite signal of many signals of preceding step through type.Step 5006 can utilize the combiner functional block 246 of Fig. 2 A to realize that combiner functional block 246 can be realized by the firmware/software piece 310 of Fig. 3 itself.After the step 5006, flow chart 5000 proceeds to step 5008.
In the step 5008 of present embodiment, for soft symbol is selected the bit position.Soft symbol be can be decoded continuous six bit sequences in the composite signal of device assessment.Required bit position can be separated from composite signal by several different methods, such as utilizing scaling function or passing through the signal reformatting.Step 5008 can utilize the bit selection function 250 of Fig. 2 A and Fig. 2 B to finish.But the present invention is suitable for how utilizing the whole bag of tricks to select the required bit position of soft symbol through the performance of signal and/or composite signal according to each.After the step 5008, flow chart 5000 proceeds to step 5010.
In the step 5010 of present embodiment, the performance of self adaptation refresh signal and selection are used for the corresponding bits position of soft symbol.Step 5010 can be carried out to the timetable of locking equipment according to being fit to.For example, can realize adaptive updates based on system cycle or some other similar standard.In one embodiment, the execution that refreshes is based on discontinuous signal value, for example, and signal sampling of per 125 millisecond periods.In another embodiment, it is default value that given bit position is set, and is used for initialization system operation or consistent performance histories., for environmental change, can change bit position, for example when signal performance becomes above threshold value thereafter.On the other hand, the present invention also be suitable for various be used to determine the bit position should timing changing and how to change administrative skill.
Table 1
| The HDS attribute | <16，8，t> | <16，7，t> | <16，6，t> | <16，5，t> | Floating-point | TR45 |
| Convert | 1 | 0.5 | 0.25 | 0.125 | -- | -- |
| ????1.2K | ||||||
| Finger 1 (9.6dB) | ???????-- | 1.340％ | 1.260％ | ?????????-- | 0.980％ | 3.00％ |
| Finger 1 (13.1dB) | ?????????-- | 0.614％ | 0.568％ | ?????????-- | ||
| Finger 2 (4.2dB) | ???????-- | 0.700％ | 0.500％ | 1.000％ | 0.010％ | 3.000％ |
| Finger 2 (6.8dB) | ???????-- | 0.300％ | 0.400％ | 0.600％ | 0.410％ | 0.500％ |
| ????4.8K | ||||||
| Finger 1 (13.68dB) | ???????-- | 0.445％ | 0.495％ | 0.510％ | 0.530％ | 0.600％ |
| Finger 1 (7.68dB) | ???????-- | 8.182％ | 8.082％ | 8.262％ | 6.821％ | 7.300％ |
| ????9.6 | ||||||
| Finger 2 (7.6dB) | ???????-- | 0.150％ | 0.170％ | 0.700％ | 0.325％ | 0.500％ |
| Finger 2 (5.1dB) | ???????-- | 2.900％ | 3.200％ | 4.000％ | n/a | 2.500％ |
| ????1.8K | ||||||
| Finger 1 (2.1dB) | ???????-- | 2.351％ | 2.301％ | 2.952％ | n/a | n/a |
| Finger 1 (0.1dB) | ???????-- | 20.46％ | 20.46％ | 21.96％ | n/a | n/a |
| ????14.4K | ||||||
| Finger 1 (7.1dB) | 0.450％ | 0.500％ | 0.750％ | 1.601％ | n/a | 2.000％ |
| Finger 1 (3.1dB) | 50.47％ | 56.62％％ | 51.37％ | 68.58％ | n/a | 30.00％ |
By adaptive updates is the bit that soft symbol is selected, and the present invention provides greater flexibility for communication equipment.This flexibility allows communication equipment to adapt to the environment that changes, and this may be important to mobile communication equipment.Thus, the present invention provides the best soft symbol part of composite signal for subsequent demodulation.Described bit selection course provides a very little space, and it makes the large-signal amplitude saturated.Described process is feasible, because when big amplitude, signal is unlikely by incorrect decoding, does not therefore need high-resolution under these signal amplitudes.This scheme is impelled the more high-resolution around the source, and makes the large-signal amplitude saturated.
Although the flow chart of present embodiment 5000 illustrates the step of particular order and quantity, yet the present invention also is suitable for other embodiment.For example, the present invention does not need institute that flow chart 5000 provides in steps.And can add other step in these steps at present.Specifically, flow chart 5000 uses combined test to set up confidence level.
Equally, according to use can modify steps order.And, be the unitary series of operations process though flow chart 5000 provides, yet can implement these as process continuous or in parallel.For example, for the continuous signal value, can be continuously or repeat flow chart 5000 discontinuously.
Many instructions in flow chart 5000 steps and the input in the step and dateout utilize memory 316, processor 314 and/or processor 317.Memory in the present embodiment can be such as the permanent memory of read-only memory (ROM) or such as the temporary storage of random asccess memory (RAM).Memory 316 also can be other any type can stored program instruction memory, such as hard disk drive, CD-ROM or flash memory.On the other hand, can be by executing instruction with the state machine of certain form.
In view of the embodiment that introduces herein, the present invention provides the method and apparatus of the ability, fidelity and the performance that are used to improve digital communication effectively.More particularly, the invention provides a kind of be used for that suitably assessment received be used to be treated to for example method and apparatus of the signal of the meaningful data of speech data.At last, as realizing in this description like that, a kind of method provided by the invention can overcome the prior art of a part of selecting the binding signal that is used to decode and limit to.Therefore this improve the flexibility of quality of signals and communication equipment.
For the purpose of illustration and description, the front is described relevant specific embodiment of the present invention.These do not mean that is exclusive or does not mean that and limit the present invention to disclosed precise forms, and according to above teaching, many modifications and variations obviously all are possible.Select and describe these embodiment, make others skilled in the art can utilize the present invention and the different embodiment with various modifications, the application-specific that it is suitable for expecting best thus so that explain principle of the present invention and practical application thereof best.Scope of the present invention is by accompanying Claim book and the definition of its equivalent.
Claims (12)
1. method that is provided for a part of signal of subsequent operation in communication equipment said method comprising the steps of:
A) receive described signal at described communication equipment;
B) described signal is carried out demodulation;
C) determine the intensity of described signal; And
D), select the bit position of described signal for described subsequent operation according to the described intensity of described signal.
2. the method for claim 1 is characterized in that described communication equipment comprises: receiver, the described signal of the suitable reception of described receiver; Processor, described processor is connected to described receiver; And computer-readable memory unit, described computer-readable memory unit is connected to described processor, described computer-readable memory unit comprises the program command that wherein stores, and described program command is implemented as the described method that subsequent operation provides a part of signal by described processor.
3. the method for claim 1, it is characterized in that: described method is provided by computer-readable media, and described computer-readable media comprises computer-readable code, is used to make described communication equipment to be implemented as the described method that subsequent operation provides a part of signal.
4. claim 1,2 or 3 method is characterized in that described subsequent operation is a decode operation.
5. claim 1,2 or 3 method is characterized in that described intensity is signal to noise ratio (snr).
6. claim 1,2 or 3 method, the described bit position that it is characterized in that selecting is by adaptive updates.
7. claim 1,2 or 3 method is characterized in that: a plurality of many each through signal are all carried out the step of described step a) to described step c).
8. the method for claim 7 is characterized in that further comprising the steps of:
E) described a plurality of many each through signal are carried out combination with the formation composite signal; And
F), select to be used for the bit position of the described composite signal of described decode operation according to the described intensity of described signal for described a plurality of many each through signal.
9. the method for claim 8 is characterized in that the step f) of described selection bit position also comprises following steps:
F1) definite average bit position that is fit to the described composite signal of its signal to noise ratio; And
F2) described composite signal be multiply by conversion factor, so as near described average bit position the described composite signal of convergent-divergent.
10. the method for claim 8 is characterized in that selecting according to the reception condition of described many each through signal the described bit position of described composite signal.
11. the method for claim 1 is characterized in that described bit position comprises six continuous binary digits of described composite signal.
12. claim 1,2 or 3 method is characterized in that described communication equipment is the cell phone of code division multiple access (CDMA) configuration.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US17170099P | 1999-12-22 | 1999-12-22 | |
| US60/171700 | 1999-12-22 | ||
| US09/677,938 US6754503B1 (en) | 2000-10-02 | 2000-10-02 | Method for adaptively selecting a soft symbol for a subsequent operation a communication device |
| US09/677938 | 2000-10-02 | ||
| PCT/US2000/035051 WO2001047137A1 (en) | 1999-12-22 | 2000-12-22 | Method and apparatus for adaptively selecting a soft symbol |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1349686A true CN1349686A (en) | 2002-05-15 |
| CN1320780C CN1320780C (en) | 2007-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB008066132A Expired - Fee Related CN1320780C (en) | 1999-12-22 | 2000-12-22 | Method and apparatus for adaptively selecting a soft symbol |
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| EP (1) | EP1155511A1 (en) |
| JP (1) | JP2003518809A (en) |
| KR (1) | KR100782628B1 (en) |
| CN (1) | CN1320780C (en) |
| WO (1) | WO2001047137A1 (en) |
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|---|---|---|---|---|
| DE10238300B4 (en) * | 2002-08-21 | 2006-08-10 | Infineon Technologies Ag | Method and architecture for transferring symbols of a rake-finger structure to task-specific hardware modules |
| EP1568141B1 (en) * | 2002-11-20 | 2009-09-16 | Interdigital Technology Corporation | Communication system and method using signal to noise ratio estimation for scaling in processing received wireless communication signals |
| KR101050615B1 (en) * | 2004-01-05 | 2011-07-19 | 삼성전자주식회사 | Input range adjusting device and method for soft decision decoder |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446763A (en) * | 1991-07-02 | 1995-08-29 | Motorola, Inc. | Apparatus and method for converting soft symbols into soft bits |
| US5841816A (en) * | 1992-10-22 | 1998-11-24 | Ericsson Inc. | Diversity Pi/4-DQPSK demodulation |
| KR100264861B1 (en) * | 1992-11-24 | 2000-09-01 | 윤종용 | How to Display the Strength of a Digital Signal |
| US5572552A (en) * | 1994-01-27 | 1996-11-05 | Ericsson Ge Mobile Communications Inc. | Method and system for demodulation of downlink CDMA signals |
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2000
- 2000-12-22 WO PCT/US2000/035051 patent/WO2001047137A1/en active Application Filing
- 2000-12-22 KR KR1020017010616A patent/KR100782628B1/en not_active IP Right Cessation
- 2000-12-22 CN CNB008066132A patent/CN1320780C/en not_active Expired - Fee Related
- 2000-12-22 JP JP2001547757A patent/JP2003518809A/en not_active Withdrawn
- 2000-12-22 EP EP00989429A patent/EP1155511A1/en not_active Withdrawn
Also Published As
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|---|---|
| WO2001047137A8 (en) | 2001-09-27 |
| KR100782628B1 (en) | 2007-12-06 |
| KR20010112276A (en) | 2001-12-20 |
| WO2001047137A1 (en) | 2001-06-28 |
| CN1320780C (en) | 2007-06-06 |
| JP2003518809A (en) | 2003-06-10 |
| EP1155511A1 (en) | 2001-11-21 |
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