CN101764643A - Channel equalization method and system based on physical layer Mesh to combining precursor and pilot frequency - Google Patents
Channel equalization method and system based on physical layer Mesh to combining precursor and pilot frequency Download PDFInfo
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Abstract
The invention discloses a channel equalization method based on physical layer Mesh to combining precursor and pilot frequency and a system thereof. The method comprises: extracting the first OFDM symbol of the received data frame to obtain a received precursor sequence; calculating precursor channel estimation according to the received precursor sequence; extracting data symbols in the received data frame to determine the plural elements at the position of data symbol pilot frequency and obtain a received data symbol pilot frequency; calculating phase position estimation according to the received data symbol pilot frequency; combining the amplitude of the precursor signal estimation and the phase position of the phase position estimation value to determine a channel estimation compensation value to compensate subsequent OFDM symbol data. In the invention, amplitude of the precursor and phase position of pilot frequency are combined to determine compensation value to estimate the phase deviation of OFDM symbol of next part, and more precise channel estimation is adopted to balance the channels, thus enhancing the overall performance of wireless communication system.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of channel equalization method and system based on physical layer Mesh to combining precursor and pilot tone.
Background technology
In many broadband wireless communication technique, Orthogonal Frequency DivisionMultiplexing (OFDM) has one of technology of application prospect beyond doubt most.In the fading characteristic of channel, what the broadband wireless mobile service was had the greatest impact is multipath fading and Doppler frequency shift.And OFDM not only can be by inserting the method for Cyclic Prefix (CP), restrain the intersymbol interference that multipath brings effectively, can also be by reasonable estimation to the channel time-varying characteristics, the symbol lengths of design system alleviates the influence of channel time-varying characteristics to systematic function neatly.Because these technical characterstics of OFDM have avoided adopting complicated time-domain equalizer and adaptive tracing algorithm in receiver.And by using fast Fourier transform (FFT), can guarantee provides reliable, stable communication quality under simple relatively system hardware structure.Exactly because these advantages, OFDM technology are by the extensively employing of various wireless communication standard institute.
Though system configuration can be eliminated intersymbol interference, ofdm system still needs precise channels information to carry out channel equalization, thus the full remuneration multipath fading.
Summary of the invention
The object of the present invention is to provide a kind of channel equalization method and system based on physical layer Mesh to combining precursor and pilot tone.Based on the present invention, can obtain accurate relatively channel information channel is carried out equilibrium, to improve the performance of wireless system.
A kind of channel equalization method based on physical layer Mesh to combining precursor and pilot tone of the present invention comprises the steps: leading channel estimating obtaining step, extracts first OFDM symbol of the Frame that receives, obtains the targeting sequencing of reception; According to described receiving preamble sequences, calculate leading channel estimating; The phase estimation obtaining step extracts the data symbol in the Frame that receives, and determines the plural elements at described data symbol pilot frequency locations place, obtains the data symbol pilot sequence of reception; According to the data symbol pilot sequence of described reception, calculate phase estimation; Channel estimating compensation value calculation step, joining together of the amplitude that described targeting signal is estimated and the phase place of described phase estimation value determined the channel estimating offset, to compensate follow-up OFDM symbol data.
Above-mentioned channel equalization method, in the preferred described leading channel estimating obtaining step, according to described receiving preamble sequences, calculate leading channel estimating and be specially: targeting sequencing and local targeting sequencing according to described reception are determined described leading channel estimating according to the LS method.
Above-mentioned channel equalization method, in the preferred described phase estimation obtaining step, according to described reception data symbol pilot sequence, calculate phase estimation and comprise:
The phase estimation step according to described reception data symbol pilot sequence, is calculated described phase estimation, and with described phase-interpolation to an OFDM symbol lengths, obtains the phase estimation value after the interpolation.
Above-mentioned channel equalization method, in the preferred described channel estimating compensation value calculation step, foundation: H_est=|H_estimate_preamble|*ej*Phase_est obtains described channel estimating offset;
Wherein, H_est is the channel estimating offset, and H_estimate_preamble is described leading channel estimating, | H_estimate_preamble| is the amplitude of described leading channel estimating; Phase_est is the phase estimation value after the described interpolation.
On the other hand, the present invention also provides a kind of channel equalization system based on physical layer Mesh to combining precursor and pilot tone, comprising: leading channel estimating acquisition module, be used to extract first OFDM symbol of receiving data frames, and obtain the targeting sequencing of reception; According to described receiving preamble sequences, calculate leading channel estimating; The phase estimation acquisition module is used for extracting the data symbol of described receiving data frames, determines the plural elements at described data symbol pilot frequency locations place, obtains the reception data symbol pilot sequence; According to the data symbol pilot sequence of described reception, calculate phase estimation; Channel estimating compensation value calculation module is used for the joining together of phase place of amplitude that described targeting signal is estimated and described phase estimation value, determines the channel estimating offset, to compensate follow-up OFDM symbol data.
Above-mentioned channel equalization system, in the preferred described amplitude compensating factor acquisition module, according to described receiving preamble sequences, calculate leading channel estimating and be specially: targeting sequencing and local targeting sequencing according to described reception are determined described leading channel estimating according to LS (least square is poor) method.
Above-mentioned channel equalization system, in the preferred described phase estimation acquisition module, according to described reception data symbol pilot sequence, the calculating phase estimation comprises: the phase estimation unit, be used for according to described reception data symbol pilot sequence, calculate described phase estimation, and with described phase-interpolation to an OFDM symbol lengths, obtain the phase estimation value after the interpolation.
Above-mentioned channel equalization system, in the preferred described channel estimating compensation value calculation module, foundation: H_est=|H_estimate_preamble|*ej*Phase_est obtains described channel estimating offset;
Wherein, H_est is the channel estimating offset, and H_estimate_preamble is described leading channel estimating, | H_estimate_preamble| is the amplitude of described leading channel estimating; Phase_est is the phase estimation value after the described interpolation.
Leading and the pilot tone that the present invention inserts in the OFDM modulated process, utilize the stability of leading amplitude and the accuracy of pilot phase, use leading amplitude to add that the phase place of pilot tone estimates the phase deviation of next part OFDM symbol, with precise channels information comparatively channel is carried out equilibrium, improved the overall performance of wireless communication system.
Description of drawings
Fig. 1 is the flow chart of steps that the present invention is based on the channel equalization method embodiment of physical layer pilot tone;
With reference to Fig. 2, Fig. 2 is for inventing based on the signal processing schematic diagram among the channel equalization method embodiment of physical layer pilot tone;
Fig. 3 is IEEE 802.16e physical layer frame structure figure;
Fig. 4 is OFDM data symbol pilot frequency locations figure;
Fig. 5 is the receiver structure block diagram;
Fig. 6 is the structural representation that the present invention is based on the channel equalization system embodiment of physical layer pilot tone.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, Fig. 1 is the flow chart of steps that the present invention is based on the channel equalization method embodiment of physical layer pilot tone.Comprise the steps:
Leading channel estimating obtaining step 110, first OFDM symbol of the Frame that extraction receives obtains receiving preamble sequences; Targeting sequencing according to described reception calculates leading channel estimating.
Phase estimation obtaining step 120 extracts the data symbol in the Frame of described reception, determines the plural elements at described data symbol pilot frequency locations place, obtains the reception data symbol pilot sequence; According to the data symbol pilot sequence of described reception, calculate phase estimation.
Channel estimating compensation value calculation step 130, joining together of the amplitude that described targeting signal is estimated and the phase place of described phase estimation value determined the channel estimating offset, to compensate follow-up OFDM symbol data.
With reference to Fig. 2, Fig. 2 is for inventing based on the signal processing schematic diagram among the channel equalization method embodiment of physical layer pilot tone.After the Frame that receives carried out pilot extraction and leading extraction respectively,, generate phase estimation based on pilot extraction; Based on leading extraction, generate leading channel estimating.Phase estimation and leading channel estimating according to generating compensate the data that receive.
Present embodiment makes full use of the estimated value of the leading and pilot tone of inserting in the OFDM modulated process, utilize the stability of leading amplitude and the accuracy of pilot phase, use leading amplitude to add that the phase place of pilot tone estimates the phase deviation of next part OFDM symbol, thereby play the effect of optimizing ofdm system.
In the foregoing description, according to the transmission characteristic of wireless channel, channel is divided into amplitude influence and phase effect to the influence of signal effect, amplitude influence that respectively will be leading is estimated and the phase effect estimation of pilot tone acts on OFDM data symbol and carries out equilibrium.The amplitude influence is drawn by the result of LS algorithm, and phase effect is also utilized similar processing method.
Below in conjunction with Fig. 3 to Fig. 5, the foregoing description is described further.Wherein, Fig. 3 is IEEE 802.16e physical layer frame structure figure, and as we can see from the figure, the frame structure of IEEE802.16e physical layer is divided into 1 leading, 4 data symbol and 1 protection symbol, and pilot tone all is inserted among the data symbol.Fig. 4 is OFDM data symbol pilot frequency locations figure, and a is data among the figure, and b is the pilot tone of inserting in the data, and c is 0 frequency.Fig. 5 is the receiver structure block diagram, as seen in Figure 5, receiver is divided into synchronization module, OFDM demodulation module, balance module, data demodulation module and five parts of synchronization module, and the channel estimating that this patent proposed is thought to be achieved in balance module.
Step (1), initialization.Establishing frame structure frequency domain targeting sequencing according to IEEE 802.16e is H_preamble, is made of 201 sequence of complex numbers, and the data symbol pilot tone is H_pilot, 8 sequence of real numbers.After the channel transmission, OFDM demodulation output leading symbol sequence is H_preamble_receive, is made of 200 sequence of complex numbers, and the reception pilot frequency sequence is H_pilot_receive, 8 sequence of complex numbers.The data that receive are Data, 200 sequence of complex numbers.
Step (2) obtains leading channel estimation value H_estimate_preamble by receiving leading symbol sequence and local targeting sequencing according to the LS method
Step (3) generates phase compensating factor Phase_compensate_pilot and amplitude compensating factor Amplitude_compensate_preamble.Wherein phase compensating factor is to carry out advancing after the channel estimating interpolation to an OFDM symbol lengths by the pilot tone in each symbol to get its phase place and obtain Phase_est again, and amplitude compensating factor is that the H_estimate_preamble by step 2 gets amplitude and obtains.
Step (4) is got up the amplitude of targeting signal estimated value and the phase combining of each section OFDM symbol pilot signal phase estimated value, forms final channel estimating offset H_est, and utilizes this estimated value to compensate ensuing OFDM symbol.Wherein compensation H_est=|H_estimate_preamble|*ej*Phase_est.
Wherein, H_est is the channel estimating offset, and H_estimate_preamble is described leading channel estimating, | H_estimate_preamble| is the amplitude of described leading channel estimating; Phase_est is the phase estimation after the described interpolation.
With reference to Fig. 6, Fig. 6 is the structural representation that the present invention is based on the channel equalization system embodiment of physical layer pilot tone.Comprise:
Leading channel estimating acquisition module 62 is used to extract first OFDM symbol of the Frame of reception, obtains receiving preamble sequences; Targeting sequencing according to described reception calculates leading channel estimating.
Phase estimation acquisition module 64 is used for extracting the data symbol of the Frame of described reception, determines the plural elements at described data symbol pilot frequency locations place, obtains the data symbol pilot sequence of reception; According to described reception data symbol pilot sequence, calculate phase estimation.
Channel estimating compensation value calculation module 66 is used for the joining together of phase place of amplitude that described targeting signal is estimated and described phase estimation value, determines the channel estimating offset, to compensate follow-up OFDM symbol data.
Similar among the operation principle of above-mentioned each module and the method embodiment, do not repeat them here, relevant part is mutually with reference to getting final product.
More than a kind of channel equalization method and system based on physical layer Mesh to combining precursor and pilot tone provided by the present invention is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. the channel equalization method based on physical layer Mesh to combining precursor and pilot tone is characterized in that, comprises the steps:
Leading channel estimating obtaining step, first OFDM symbol of the Frame that extraction receives obtains the targeting sequencing of reception; According to described receiving preamble sequences, calculate leading channel estimating;
The phase estimation obtaining step extracts the data symbol in the Frame that receives, and determines the plural elements at described data symbol pilot frequency locations place, obtains the data symbol pilot sequence of reception; According to the data symbol pilot sequence of described reception, calculate phase estimation;
Channel estimating compensation value calculation step, joining together of the amplitude that described targeting signal is estimated and the phase place of described phase estimation value determined the channel estimating offset, to compensate follow-up OFDM symbol data.
2. channel equalization method according to claim 1 is characterized in that, in the described leading channel estimating obtaining step, according to described receiving preamble sequences, calculates leading channel estimating and is specially:
Targeting sequencing and local targeting sequencing according to described reception are determined described leading channel estimating according to the LS method.
3. channel equalization method according to claim 2 is characterized in that, in the described phase estimation obtaining step, according to described reception data symbol pilot sequence, calculates phase estimation and comprises:
The phase estimation step according to described reception data symbol pilot sequence, is calculated described phase estimation, and with described phase-interpolation to an OFDM symbol lengths, obtains the phase estimation value after the interpolation.
4. channel equalization method according to claim 3 is characterized in that, in the described channel estimating compensation value calculation step, and foundation
H_est＝|H_estimate_preamble|*e
j*Phase_est
Obtain described channel estimating offset;
Wherein, H_est is the channel estimating offset, and H_estimate_preamble is described leading channel estimating, | H_estimate_preamble| is the amplitude of described leading channel estimating; Phase_est is the phase estimation value after the described interpolation.
5. the channel equalization system based on physical layer Mesh to combining precursor and pilot tone is characterized in that, comprising:
Leading channel estimating acquisition module is used to extract first OFDM symbol of receiving data frames, obtains the targeting sequencing of reception; According to described receiving preamble sequences, calculate leading channel estimating;
The phase estimation acquisition module is used for extracting the data symbol of described receiving data frames, determines the plural elements at described data symbol pilot frequency locations place, obtains the reception data symbol pilot sequence; According to the data symbol pilot sequence of described reception, calculate phase estimation;
Channel estimating compensation value calculation module is used for the joining together of phase place of amplitude that described targeting signal is estimated and described phase estimation value, determines the channel estimating offset, to compensate follow-up OFDM symbol data.
6. channel equalization according to claim 5 system is characterized in that, in the described amplitude compensating factor acquisition module, according to described receiving preamble sequences, calculates leading channel estimating and is specially:
Targeting sequencing and local targeting sequencing according to described reception are determined described leading channel estimating according to the LS method.
7. channel equalization according to claim 6 system is characterized in that, in the described phase estimation acquisition module, according to described reception data symbol pilot sequence, calculates phase estimation and comprises:
The phase estimation unit is used for calculating described phase estimation according to described reception data symbol pilot sequence, and with described phase-interpolation to an OFDM symbol lengths, obtains the phase estimation value after the interpolation.
8. channel equalization according to claim 7 system is characterized in that, in the described channel estimating compensation value calculation module, and foundation
H_est＝|H_estimate_preamble|*e
j*Phase_est
Obtain described channel estimating offset;
Wherein, H_est is the channel estimating offset, and H_estimate_preamble is described leading channel estimating, | H_estimate_preamble| is the amplitude of described leading channel estimating; Phase_est is the phase estimation value after the described interpolation.
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| CN103986678A (en) * | 2013-02-11 | 2014-08-13 | 芯迪半导体科技（上海）有限公司 | A receiver used for orthogonal frequency division multiplexing OFDM channel estimation and estimation method thereof |
| CN104767699A (en) * | 2010-08-26 | 2015-07-08 | 高通股份有限公司 | SINGLE STREAM PHASE TRACKING method and device IN WIRELESS MIMO COMMUNICATION SYSTEM |
| CN105141555A (en) * | 2014-05-27 | 2015-12-09 | 恩智浦有限公司 | System and method for performing channel estimation on an ofdm signal |
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| CN118200086A (en) * | 2024-05-20 | 2024-06-14 | 成都泰格微电子研究所有限责任公司 | Interference identification method based on frequency domain equalization method |
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| US9832064B2 (en) | 2010-08-26 | 2017-11-28 | Qualcomm Incorporated | Single stream phase tracking during channel estimation in a very high throughput wireless MIMO communication system |
| CN104767699B (en) * | 2010-08-26 | 2018-03-06 | 高通股份有限公司 | Single current phase-tracking method and device in wireless MIMO communication system |
| CN103986678A (en) * | 2013-02-11 | 2014-08-13 | 芯迪半导体科技（上海）有限公司 | A receiver used for orthogonal frequency division multiplexing OFDM channel estimation and estimation method thereof |
| CN103986678B (en) * | 2013-02-11 | 2017-12-26 | 芯迪半导体科技（上海）有限公司 | A kind of receiver and its method of estimation for orthogonal frequency division multiplex OFDM channel estimation |
| CN103152300A (en) * | 2013-03-13 | 2013-06-12 | 中国航天科技集团公司第九研究院第七七一研究所 | OFDM (orthogonal frequency division multiplexing) receiver based on pilot frequency and channel balance method thereof |
| CN105141555A (en) * | 2014-05-27 | 2015-12-09 | 恩智浦有限公司 | System and method for performing channel estimation on an ofdm signal |
| CN105141555B (en) * | 2014-05-27 | 2018-08-24 | 恩智浦有限公司 | System and method for executing channel estimation to ofdm signal |
| CN113132280A (en) * | 2021-04-15 | 2021-07-16 | 深圳智微电子科技有限公司 | IQ imbalance estimation method |
| CN113132280B (en) * | 2021-04-15 | 2022-06-24 | 深圳智微电子科技有限公司 | IQ imbalance estimation method |
| CN114285709A (en) * | 2021-12-31 | 2022-04-05 | 北京中科晶上科技股份有限公司 | Phase tracking method and device of received signal and signal processing system |
| CN114285709B (en) * | 2021-12-31 | 2023-04-25 | 北京中科晶上科技股份有限公司 | Method and device for tracking phase of received signal and signal processing system |
| CN118200086A (en) * | 2024-05-20 | 2024-06-14 | 成都泰格微电子研究所有限责任公司 | Interference identification method based on frequency domain equalization method |
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Application publication date: 20100630 |