CN101552748A - A channel estimate method that eliminates the impact of timing deviation - Google Patents
A channel estimate method that eliminates the impact of timing deviation Download PDFInfo
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- CN101552748A CN101552748A CNA2009100818832A CN200910081883A CN101552748A CN 101552748 A CN101552748 A CN 101552748A CN A2009100818832 A CNA2009100818832 A CN A2009100818832A CN 200910081883 A CN200910081883 A CN 200910081883A CN 101552748 A CN101552748 A CN 101552748A
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Abstract
The present invention is a channel estimate method that eliminates the impact of timing deviation. After compensation of timing deviation, data enter a delay unit and are divided into two ways of data. One way of the delayed data obtain pilot frequency through extraction of pilot frequency, estimate the channel where pilot frequency is in by using the pilot frequency and then obtain channel frequency domain response through channel interpolation, which will be used for channel compensation; the other way of data directly use the estimated channel frequency domain response as channel compensation. The advantage of the present invention is to provide a channel estimate method that eliminates the impact of timing deviation. This method effectively raises channel estimate accuracy at a small price.
Description
Technical field
The present invention is a kind of channel estimation methods of eliminating the timing offset influence, more particularly, is that a kind of rule of utilizing timing offset that each sub-carrier phase is changed compensates data, thereby eliminates the timing offset influence.
Background technology
In the wireless transmission environment, the response of the time-domain and frequency-domain of channel becomes when being; The frequency selective fading that is caused by multipath effect also shows the inconsistency of decline on different subcarriers, thereby causes occurring on each data subcarrier of OFDM (OFDM) symbol the inhomogeneities of distortion.For the performance that guarantees system is not subjected to the influence of channel multi-path and fading effect, just need to adopt the method for channel estimating to follow the tracks of the variation of channel response.In many channel estimation methods, pilot tone assisted channel estimation algorithm is fairly simple, is easy to Project Realization.
This channel estimation method is an effective means of estimating the channel response state.It utilizes timing offset to make the rule of carrier phase rotation, and data are compensated, and then carries out conventional channel again and estimates and interpolation, thereby obtain channel frequency domain response accurately.
Summary of the invention
The objective of the invention is to: proposed a kind of channel estimation methods of eliminating the timing offset influence, can eliminate the timing offset influence effectively.
Technical scheme of the present invention is: a kind of channel estimation methods of eliminating the timing offset influence, it is made of timing offset compensating module, delay unit module, pilot extraction module, pilot tone present position channel estimation module, channel interpolating module and channel compensation block.The timing offset compensating module utilizes timing offset that the phase place rotation regulation is compensated data.The delay unit module uses ping-pong operation to produce time-delay, and the length of time-delay is relevant with pilot frequency design.Pilot extraction module comes out the pilot extraction of each time-delay circuit-switched data to use as channel estimating.Pilot tone present position channel estimation module estimates this pilot tone subchannel frequency domain response of living in.The channel interpolating module utilizes pilot tone subchannel frequency domain response of living in to estimate the frequency domain response of all subchannels by interpolation.Channel compensation block uses channel estimation results that data are compensated, thereby reduces channel to signal transmission influence.
Advantage of the present invention is: a kind of channel estimation methods of eliminating the timing offset influence is provided, and this method has improved precision of channel estimation effectively with less cost.
Description of drawings
Fig. 1 is that channel estimating is implemented theory diagram.
Fig. 2 does not use planisphere after this method to CMMB signal format.
Fig. 3 uses planisphere after this method to CMMB signal format.
Embodiment
Below the present invention is done and describe in further detail.Referring to Fig. 1, the present invention is made of timing offset compensating module, delay unit module, pilot extraction module, pilot tone present position channel estimation module, channel interpolating module and channel compensation block.
The function that A timing offset compensating module is finished is: the data that timing offset is arranged are compensated, and compensation back signal is: Y
τ(l, k)=Y (l, k) exp (j2 π k τ/N), wherein Y
τ((l represents the sequence number of this symbol in a time slot to Y for l, k) expression compensation front signal, and k represents the subcarrier sequence number of these data, and N represents sub-carrier number, and τ represents timing offset for l, k) expression compensation back signal.
The function that B delay unit module is finished is: use ping-pong operation that signal is delayed time.When pilot tone (being not limited to) pattern that uses CMMB signal format and when using linear interpolation (being not limited to), 2 symbol periods of delaying time.
The function that the C pilot extraction is finished is: extracting pilot frequency information is that channel estimating is prepared.
The function that D pilot tone present position channel estimation module is finished is: estimate this pilot tone subchannel frequency domain response of living in, can use but be not limited to least square estimation.
The function that the e channel interpolating module is finished is: utilize pilot tone subchannel frequency domain response of living in to estimate the frequency domain response of all subchannels by interpolation.Can use but be not limited to linear interpolation method.
The function that the F channel compensation block is finished is: use channel estimation results that data are compensated, thereby reduce channel to signal transmission influence.
This method with in CMMB (being not limited to) demodulated equipment, when signal to noise ratio 30dB, planisphere behind the channel compensation, as shown in Figure 3.Do not use this method, when signal to noise ratio 30dB, planisphere behind the channel compensation, as shown in Figure 2.As seen this method has been improved precision of channel estimation, thereby has improved receiver performance.
Claims (6)
1, a kind of channel estimation methods of eliminating the timing offset influence, enter delay unit after data compensate through timing offset and be divided into two paths of data, data after one tunnel time-delay obtain pilot tone through pilot extraction, utilize pilot tone to carry out pilot tone present position channel estimating again, obtain channel frequency domain response through the channel interpolation then and be used for channel compensation; Another road directly utilizes the channel frequency domain response of estimating to do channel compensation.
2, channel estimation methods according to claim 1 is characterized in that delay unit can utilize ping-pong operation to delay time so that in the time orientation interpolation to data.
3, channel estimation methods according to claim 1 is characterized in that pilot extraction will be according to the requirement extraction pilot tone of pilot frequency design.
4, channel estimation methods according to claim 1 is characterized in that the channel estimating use of pilot tone present position includes, but are not limited to least square estimation pilot tone channel of living in is estimated, obtains the pilot subchannel response.
5, channel estimation methods according to claim 1 is characterized in that the use of channel interpolation includes, but are not limited to the channel estimating that linear interpolation is carried out data subcarrier, obtains channel response.
6, channel estimation methods according to claim 1 is characterized in that channel compensation uses channel estimation results that data are compensated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100818832A CN101552748A (en) | 2009-04-15 | 2009-04-15 | A channel estimate method that eliminates the impact of timing deviation |
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| CNA2009100818832A CN101552748A (en) | 2009-04-15 | 2009-04-15 | A channel estimate method that eliminates the impact of timing deviation |
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| CN101552748A true CN101552748A (en) | 2009-10-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873414A (en) * | 2014-03-10 | 2014-06-18 | 电信科学技术研究院 | Signal processing method and device of receiver |
| CN112398514A (en) * | 2019-08-16 | 2021-02-23 | 大唐移动通信设备有限公司 | Channel estimation method and device |
| CN113708914A (en) * | 2021-09-03 | 2021-11-26 | 四川安迪科技实业有限公司 | Iterative blind symbol synchronization method based on symmetrical semi-folded search successive approximation principle |
| CN113824666A (en) * | 2021-09-09 | 2021-12-21 | 中国电子科技集团公司第五十四研究所 | Channel estimation method and device for satellite mobile OFDM communication system |
-
2009
- 2009-04-15 CN CNA2009100818832A patent/CN101552748A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103873414A (en) * | 2014-03-10 | 2014-06-18 | 电信科学技术研究院 | Signal processing method and device of receiver |
| CN112398514A (en) * | 2019-08-16 | 2021-02-23 | 大唐移动通信设备有限公司 | Channel estimation method and device |
| CN112398514B (en) * | 2019-08-16 | 2022-03-29 | 大唐移动通信设备有限公司 | Channel estimation method and device |
| CN113708914A (en) * | 2021-09-03 | 2021-11-26 | 四川安迪科技实业有限公司 | Iterative blind symbol synchronization method based on symmetrical semi-folded search successive approximation principle |
| CN113708914B (en) * | 2021-09-03 | 2023-04-25 | 四川安迪科技实业有限公司 | Iterative blind symbol synchronization method based on symmetrical halving search successive approximation principle |
| CN113824666A (en) * | 2021-09-09 | 2021-12-21 | 中国电子科技集团公司第五十四研究所 | Channel estimation method and device for satellite mobile OFDM communication system |
| CN113824666B (en) * | 2021-09-09 | 2022-08-02 | 中国电子科技集团公司第五十四研究所 | Channel estimation method and device for satellite mobile OFDM communication system |
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Application publication date: 20091007 |