CN200987177Y - Equipment for evaluating channel to incoming signal - Google Patents
Equipment for evaluating channel to incoming signal Download PDFInfo
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- CN200987177Y CN200987177Y CN 200620120970 CN200620120970U CN200987177Y CN 200987177 Y CN200987177 Y CN 200987177Y CN 200620120970 CN200620120970 CN 200620120970 CN 200620120970 U CN200620120970 U CN 200620120970U CN 200987177 Y CN200987177 Y CN 200987177Y
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Abstract
The utility model discloses a device with the function of estimating channel for input signal, wherein, different part of the input signal uses different modulation type to modulate, the device includes a buffer used for storing input signal; a first derotation device used for derotation of training sequence in the input signal; a synchronization device used for treating the signal after derotation; a channel estimator used for channel estimation of synchronous location information after the relevant treatment of the synchronization device, the signal after derotation and the known training sequence; a channel estimation converter used for converting the channel estimation corresponding to the first modular type after channel estimating into the channel estimation corresponding to the second modular type; a second derotation device used for information sequence in input signal; a balance device used for demodulating the information sequence after derotation with the converted channel estimation to gain determined symbol. The application of the device provided by the utility model realizes that the input signal is provided with correct channel estimation.
Description
Technical field
The utility model relates to a kind of common apparatus, relates in particular to a kind of equipment of input signal being estimated channel.
Background technology
In the communication system that comprises transmitter and receiver, the information that exchanges between transmitter and receiver comprises data bit and synchronization bit, and described information is modulated so that transmission.In some cellular communication system, advantageously use a kind of modulation type in the first that sends signal (for example being used for synchronously and the part of channel estimating), and using another kind of modulation type at the second portion (for example contain and will send section data) that sends signal, this allows to select modulation type to be used for effective transmitter realization.For an effective transmitter structure, in modulation format, introduce a skew usually.Here, skew is meant that symbol constellation rotates π/8 radians between adjacent-symbol.This rotation produces the transmission signal that has low peak-average specific and do not have zero crossing, thereby is that an effective transmitter structure creates conditions.
In receiver one side, the signal of reception must be by derotation, so that the correct symbol that receives that detects.But, because the multipath fading of radio wave, the rotation of the signal of reception causes a radio channel estimation as the function of offset rotation.
Information in the cellular radio Communication system typically sends in containing a burst such as the synchronizing signal of training sequence and an information sequence.If whole burst by with identical modulation format transmission, then can exist by the caused negative effect of channel estimating as the function of offset rotation.But, be used to training sequence if having a kind of modulation type of determining skew, and another modulation type with another skew is used to information sequence, then must be for conversion into a kind of correct channel estimating corresponding to second kind of modulation type corresponding to first kind of channel estimating that modulation type obtained.Therefore, just need a kind of equipment, be used for estimating be for conversion into the respective channel that obtains corresponding to another kind of modulation type corresponding to the channel estimating that a kind of modulation type obtained.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of equipment to input signal estimation channel, estimates to realize being for conversion into corresponding to the channel estimating that a kind of modulation type was obtained the respective channel that is obtained corresponding to another kind of modulation type.
In order to solve the problems of the technologies described above, the utility model provides a kind of equipment of input signal being estimated channel, wherein the different piece of input signal uses different modulation types to modulate, this equipment comprises: buffer, first derotator, synchronizer, channel estimator, the channel estimating converter, second derotator, equalizer, wherein, the first derotator level is coupled to after the buffer, first's signal to input signal in the buffer carries out derotation, obtain being suitable for the signal of first kind of modulation type, described synchronizer is connected with first derotator, signal after the derotation is handled to determine the sync bit information of first's signal appearance in receiving burst, the channel estimator that is connected with synchronizer is to described sync bit information, signal that obtains after the derotation and known training sequence are carried out channel estimating, the channel estimating corresponding to first kind of modulation type that the channel estimating converter that is connected with channel estimator obtains after to channel estimating is carried out conversion process, obtains the channel estimating corresponding to second kind of modulation type; The described second derotator level is coupled to after the buffer, second portion signal to input signal carries out derotation, obtain being suitable for the signal of second kind of modulation type, the equalizer that is connected with second derotator carries out equilibrium treatment to the signal that is suitable for second kind of modulation type and described channel estimating corresponding to second kind of modulation type, obtains representing definite symbol of second kind of modulation type.
Wherein, described buffer is stored input signal.
Wherein, the first's signal in the described input signal is a training sequence.The input signal that described training sequence is to use first kind of modulation type to modulate.
Wherein, described synchronizer carries out Synchronous Processing to the signal and the known training sequence that are suitable for first kind of modulation type.
Wherein, described channel estimating converter is that the channel estimating and the known training sequence of first kind of modulation type are handled.
Wherein, the second portion signal in the described input signal is an information sequence.The input signal that described information sequence is to use second kind of modulation type to modulate.
Wherein, use comes demodulation to be suitable for the signal of second kind of modulation type corresponding to the channel estimating of second kind of modulation type in the described equalizer.
Equipment described in the utility model is estimated by being for conversion into the respective channel that obtains corresponding to another kind of modulation type corresponding to the channel estimating that a kind of modulation type obtained, realized when the different piece of input signal is modulated with more than one modulation type, for this input signal provides a kind of correct channel estimating.
Description of drawings
Fig. 1 is according to the described a kind of device structure schematic diagram of input signal being estimated channel of the utility model embodiment.
Embodiment
Below describe at cellular radio Communication system, but the utility model is not limited thereto, also can be applied to the communication system of other type.
With reference to figure 1, for the described a kind of device structure schematic diagram of the utility model embodiment, specifically comprise: buffer, first derotator, synchronizer, channel estimator, channel estimating converter, second derotator, equalizer input signal estimation channel.
Buffer is used for input signal is stored;
First derotator is used for the training sequence of input signal is carried out derotation, obtains being suitable for the signal of first kind of modulation type;
Synchronizer is used for the signal that obtains after the derotation and known training sequence are carried out relevant, obtains the sync bit information that the training sequence in the input signal occurs in receiving burst;
Channel estimator is used for the signal and the known training sequence that obtain after described sync bit information, the derotation are carried out channel estimating, obtains the channel estimating corresponding to first kind of modulation type;
The channel estimating converter is used for the channel estimating and the known training sequence of first kind of modulation type are handled, and will be for conversion into the channel estimating corresponding to second kind of modulation type corresponding to the channel estimating of first kind of modulation type;
Second derotator is used for the information sequence of input signal is carried out derotation, obtains being suitable for the signal of second kind of modulation type;
Equalizer is used for the signal that is suitable for second kind of modulation type and carries out equilibrium treatment corresponding to the channel estimating of second kind of modulation type, obtains representing definite symbol of second kind of modulation type.
Input signal from the transmitter of base station is for conversion into a baseband signal, with predetermined burst length sampling and be stored in the buffer.
Be stored in the buffer information sequence in the input signal via first derotator, and by this derotator it is carried out derotation and handle, obtain being suitable for the signal of first kind of modulation type, then, this signal is by in the feed-in synchronizer, synchronizer is relevant with the known training sequence of communication system with this signal, so that where training sequence occurs and determine being the sync bit information that obtains the appearance in reception happens suddenly of this training sequence synchronously in reception happens suddenly in definite input signal.Synchronizer can be realized with the conventional synchronization equipment of any kind.
Then, the signal and the known training sequence that obtain after the beginning of expression training sequence or the information of sync bit, the derotation are transfused to channel estimator, it estimates the input signal about using first kind of modulation type to modulate, estimator can use the conventional channel estimator of any kind to realize, for example the least square estimation device.From the output of channel estimator promptly corresponding to the channel estimating of first kind of modulation type and known training sequence by feed-in channel estimating converter, this channel estimating converter will be for conversion into the channel estimating corresponding to second kind of modulation type corresponding to the channel estimating of first kind of modulation type.
Be stored in the buffer information sequence in the input signal via second derotator, and by this derotator it is carried out derotation and handle, obtain being suitable for the signal of second kind of modulation type, then, the signal that is suitable for second kind of modulation type is input to equalizer with the channel estimating corresponding to second kind of modulation type, equalizer can be an any kind, the maximum-likelihood sequence estimator equalizer of for example describing in digital communication.Use converted channel estimating to come the demodulation information sequence of derotation in equalizer, the output of equalizer is the symbol that is determined.
The utility model provides a kind of effective equipment, and the channel estimating that is used for that a kind of modulation type is obtained is for conversion into for the respective channel of another kind of modulation type to be estimated.Described conversion is the function that is used for different modulating type and known training sequence, therefore can be calculated in advance and be stored in the buffer, effectively realizes creating conditions thereby be one.Then, converted channel estimating is used in the equalizer receiving data decode.
Those of ordinary skill in the art should be appreciated that under the condition that does not depart from the utility model inner characteristic, can determine that form realizes the utility model with other.Therefore, where face in office, the description of the foregoing description all should be considered to illustrative and be nonrestrictive.Although abovely be described with reference to travelling carriage in the cellular communication system and base station, the utility model also can be applied to the communication system of other type.
Claims (1)
1. equipment of input signal being estimated channel, wherein the different piece of input signal uses different modulation types to modulate, it is characterized in that, comprise: buffer, first derotator, synchronizer, channel estimator, the channel estimating converter, second derotator, equalizer, wherein, the first derotator level is coupled to after the buffer, first's signal to input signal in the buffer carries out derotation, obtain being suitable for the signal of first kind of modulation type, described synchronizer is connected with first derotator, signal after the derotation is handled to determine the sync bit information of first's signal appearance in receiving burst, the channel estimator that is connected with synchronizer is to described sync bit information, signal that obtains after the derotation and known training sequence are carried out channel estimating, the channel estimating corresponding to first kind of modulation type that the channel estimating converter that is connected with channel estimator obtains after to channel estimating is carried out conversion process, obtains the channel estimating corresponding to second kind of modulation type; The described second derotator level is coupled to after the buffer, second portion signal to input signal carries out derotation, obtain being suitable for the signal of second kind of modulation type, the equalizer that is connected with second derotator carries out equilibrium treatment to the signal that is suitable for second kind of modulation type and described channel estimating corresponding to second kind of modulation type, obtains representing definite symbol of second kind of modulation type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120970 CN200987177Y (en) | 2006-09-22 | 2006-09-22 | Equipment for evaluating channel to incoming signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620120970 CN200987177Y (en) | 2006-09-22 | 2006-09-22 | Equipment for evaluating channel to incoming signal |
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| Publication Number | Publication Date |
|---|---|
| CN200987177Y true CN200987177Y (en) | 2007-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200620120970 Expired - Fee Related CN200987177Y (en) | 2006-09-22 | 2006-09-22 | Equipment for evaluating channel to incoming signal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255831A (en) * | 2011-04-14 | 2011-11-23 | 京信通信系统（中国）有限公司 | GSM (Global System for Mobile Communications)/EDGE (Enhanced Data Rate for GSM Evolution) synchronous despiralization method and device with low cost |
| US8724738B2 (en) | 2008-03-31 | 2014-05-13 | Qualcomm Incorporated | Multidimensional constellations for coded transmission |
-
2006
- 2006-09-22 CN CN 200620120970 patent/CN200987177Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8724738B2 (en) | 2008-03-31 | 2014-05-13 | Qualcomm Incorporated | Multidimensional constellations for coded transmission |
| US8867662B2 (en) | 2008-03-31 | 2014-10-21 | Qualcomm Incorporated | Multidimensional constellations for coded transmission |
| CN102255831A (en) * | 2011-04-14 | 2011-11-23 | 京信通信系统（中国）有限公司 | GSM (Global System for Mobile Communications)/EDGE (Enhanced Data Rate for GSM Evolution) synchronous despiralization method and device with low cost |
| CN102255831B (en) * | 2011-04-14 | 2014-11-12 | 京信通信系统（中国）有限公司 | GSM (Global System for Mobile Communications)/EDGE (Enhanced Data Rate for GSM Evolution) synchronous despiralization method and device with low cost |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071205 Termination date: 20130922 |