CN101136811A - OFDM transmission signal processing equipment, method and radio frequency far-end unit - Google Patents
OFDM transmission signal processing equipment, method and radio frequency far-end unit Download PDFInfo
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Abstract
The device for processing OFDM transmission signal includes radio remote unit (RRU) and base band unit (BBU). BBU is in use for carrying out data mapping from media access layer to physical layer as well as scrambling baseband data, and coding, interlacing, demodulating channel, then sending them to RRU. RRU also includes post-processing module for baseband data. The post-processing module is in use for carrying out serial-parallel conversion for baseband data, interpolation, fast reverse Fourier transform, adding circulation prefix, parallel-serial conversion, and outputting. The invention raises resolution and sampling rate of signal spectrum, saves bandwidth of transmission link between BBU and RRU as well as improves quality of transmission signal.
Description
Technical field
The present invention relates to field of mobile communication, more particularly, be a kind of in the base station OFDM (Orthogonal Frequency Division Multiplexing, OFDM) transmission signal processing equipment, method and RF remote unit.
Background technology
Along with people are more and more higher to the requirement of the speed of wirelessly transmitting data, the OFDM The Application of Technology field with high-speed radio transmittability also more and more widely.Present WLAN (wireless local area network), WiMax (Worldwide Interoperability for Microwave Access, worldwide interoperability for microwave access) have adopted the OFDM technology; Following 4G technology also may will adopt the OFDM technology.
Adopt the base station system of OFDM technology partly to finish string and conversion, IFFT (Inverse Fast Fourier Transform, anti-fast fourier transform), add CP (Cyclic Prefix, Cyclic Prefix) function at present in Base-Band Processing.The number of samples relative signal bandwidth of IFFT section processes seems fewer, only adopts 1024 IFFT conversion as the ofdm signal of 10M bandwidth in the WiMax system.Because it is low that the IFFT that adopts counts, signal rate does not satisfy Nyquist's theorem, through causing the aliasing of signal after the digital to analog conversion.Generally all will DAC (Digital to Analog Conversion, digital-to-analogue conversion) is preceding to improve the sampling rate of data by the mode to signal interpolation filtering carrying out, erasure signal is aliasing behind DAC.The computing of the IFFT too low meeting of counting causes the spectral resolution of signal low in addition, unfavorable follow-up signal processing.
In present base band and radio frequency separate type base station architecture, the transmission bandwidth between BBU (Base band Unit, Base Band Unit) and the RRU (Remote Radio Unit, RF remote unit) is subjected to the restriction of transmission medium in addition.If the sample rate of data is improved in the base band side, can increase the transmission bandwidth of transmission link between BBU and the RRU, improve hard-wired complexity and increase hardware cost.
Summary of the invention
The invention provides OFDM transmission signal processing equipment, method and RF remote unit, in order to improve signal spectrum resolution and sample rate and save BBU and RRU between transmission link bandwidth.
The invention provides a kind of OFDM transmission signal processing equipment, comprise RF remote unit, described device also comprises Base Band Unit, be used to carry out the data map of medium Access Layer to physical layer, carry out base band data scrambling, chnnel coding, interweave and modulate and send to described RF remote unit;
Described RF remote unit also comprises the base band data post-processing module, is used for the base band data that receives is gone here and there and conversion, interpolation, anti-fast fourier transform, interpolation Cyclic Prefix and and string conversion and output.
Further, said apparatus also can have following characteristics: described Base Band Unit comprises with lower module:
The base band data mapping block is used to carry out the base band data mapping of medium Access Layer to physical layer, and the output of the base band data after will shining upon;
The base band data processing module is used for the base band data that receives is carried out scrambling, chnnel coding, interweaves and modulates and exports;
The baseband interface module, the data that are used for receiving send to described RF remote unit.
Further, said apparatus also can have following characteristics: described RF remote unit comprises with lower module:
Radio frequency interface module is used to receive the data that described Base Band Unit sends, and exports to described base band data post-processing module;
The Digital IF Processing module is used to receive the data that described base band data post-processing module is exported, and carries out Digital Up Convert and digital-to-analogue conversion and handles and export;
The radiofrequency signal processing module is used to receive the data of described Digital IF Processing module output, and carries out radiofrequency signal processing and emission.
The present invention also provides a kind of RF remote unit, comprises with lower module:
Radio frequency interface module is used to receive base band data and output;
The base band data post-processing module is used to receive the base band data of described radio frequency interface module output, and goes here and there and conversion, interpolation, anti-fast fourier transform, interpolation Cyclic Prefix and also string conversion and output;
The Digital IF Processing module is used to receive the data that described base band data post-processing module is exported, and carries out Digital Up Convert and digital-to-analogue conversion and handles and export;
The radiofrequency signal processing module is used to receive the data of described Digital IF Processing module output, and carries out radiofrequency signal processing and emission.
The method that the present invention also provides a kind of OFDM to transmit and handle may further comprise the steps:
Base Band Unit carries out the medium Access Layer to the data map of physical layer, carry out base band data scrambling, chnnel coding, interweave and modulate and send to RF remote unit;
Described RF remote unit is gone here and there by the base band data that receives and conversion, interpolation, anti-fast fourier transform, interpolation Cyclic Prefix and also string conversion, and carries out launching after digital up-conversion and the digital-to-analogue conversion processing.
Further, said method also can have following characteristics: described base band data is sent to before the RF remote unit, earlier control signal and timing information are joined framing in the data;
After described RF remote unit received these frame data, advanced line data was separated frame, mask data.
Further, said method also can have following characteristics: after carrying out described Digital Up Convert and digital-to-analogue conversion and handling, obtain analog if signal, and analog if signal is made radiofrequency signal handle and be transmitted into wireless channel by antenna.
Further, said method also can have following characteristics: described radiofrequency signal handle comprise to described analog if signal do to amplify, filtering, mixing.
Adopt technical scheme provided by the invention, compared with prior art, IFFT and CP interpolation function are put into RRU, reduced the transmission bandwidth requirement between BBU and the RRU.Can in RRU, carry out N times of interpolation, and then carry out IFFT, add CP again base band data.So not only improve the spectral resolution of baseband signal but also improved the signals sampling rate, for the further processing of signal provides the foundation, overcoming the IFFT that exists in the prior art counts and low causes signal spectrum resolution low, problem that sample rate is not enough and defective, reduce the distortion of DAC output analog signal, improved the quality that transmits.
Description of drawings
Fig. 1 is an OFDM transmission signal processing equipment schematic diagram in the embodiment of the invention;
Fig. 2 is the inner function module connection diagram of the BBU in the device shown in Figure 1;
Fig. 3 is the inner function module connection diagram of the RRU in the device shown in Figure 1;
The flow chart that Fig. 4 transmits and handles for the OFDM in the embodiment of the invention.
Embodiment
Among the present invention, from BBU, transferred among the RRU with base band data being carried out IFFT and CP interpolation function, thereby it is after improving IFFT as required and counting, can be too big and increase the bandwidth demand of transmission link between BBU of base station and the RRU because of the amount of information that sampling obtains.Thereby can not only improve signal spectrum resolution and sample rate but also not increase demand transmission link bandwidth between BBU and the RRU.
Below in conjunction with embodiment and accompanying drawing the present invention is done description further.
Fig. 1 shows OFDM transmission signal processing equipment in the embodiment of the invention, and as seen, system hardware of the present invention partly comprises two big modular units, BBU and RRU.A BBU can be with a plurality of RRU.BBU is connected by optical fiber, netting twine or other channel with RRU.Interface protocol can self-defined or use standard agreement.
Wherein, this BBU is used to carry out the data map of medium Access Layer to physical layer, carry out base band data scrambling, chnnel coding, interweave and modulate and send to RRU; RRU is used for the base band data that receives gone here and there and conversion, interpolation, anti-fast fourier transform, add Cyclic Prefix and and the string conversion, and carry out digital up-conversion and digital-to-analogue conversion is handled, carry out then that radiofrequency signal is handled and emission.
The inner function module of above-mentioned BBU comprises base band data mapping block, base band data processing module, baseband interface module and power supply and other control modules as shown in Figure 2, wherein:
The base band data mapping block, be used for (Base Station Controller from BSC, base station controller) receives data, carry out MAC (Media Acess Controll, the medium Access Layer) to PHY (PhysicalLayer, physical layer) base band data mapping is finished the symbol data grouping according to the upper strata instruction, and the output of the base band data after will shining upon;
The base band data processing module is used for according to wireless transmission protocol the base band data that receives being carried out scrambling, chnnel coding, interweave and modulating and exports;
The baseband interface module, the data that are used for receiving send to RRU, the interface protocol that is specially according to BBU and RRU carries out data transport to data, add control information and clock timing information, and data are exported to RRU, promptly realize the transmission of BBU and RRU interface media data flow and control data stream.
The inner function module of above-mentioned RRU comprises interface module, base band data post-processing module, intermediate-freuqncy signal processing module and radiofrequency signal processing module as shown in Figure 3, wherein:
Radio frequency interface module, be used to receive base band data and the data that receive are separated frame, isolate media data flow and control data stream and clock information, the data output of separating, realize that promptly the reception of RRU and BBU interface media data flow and control data stream is handled according to control information;
The base band data post-processing module is used to receive the base band data of this radio frequency interface module output, and goes here and there and conversion, interpolation, anti-fast fourier transform, interpolation Cyclic Prefix and also string conversion and output;
The Digital IF Processing module is used to receive the data that this base band data post-processing module is exported, and carries out Digital Up Convert and digital-to-analogue conversion and handles and export;
The radiofrequency signal processing module is used to receive the data of this Digital IF Processing module output, and amplify, radiofrequency signals such as filtering, mixing handle and emission.
By above-mentioned signal flow relation as can be seen, in above-mentioned OFDM transmission signal processing equipment, BBU is connected with RRU; The base band data mapping block is connected with the base band data processing module; The base band data processing module is connected with the baseband interface module; The baseband interface module is connected with radio frequency interface module; Radio frequency interface module is connected with the base band data post-processing module; The base band data post-processing module is connected with the Digital IF Processing module; The Digital IF Processing module is connected with the radiofrequency signal processing module.
OFDM in embodiments of the present invention transmits the flow process handled as shown in Figure 4, may further comprise the steps:
In sum, in the present invention,, reduced the transmission bandwidth requirement between BBU and the RRU by from BBU, having transferred among the RRU with base band data being carried out IFFT and CP interpolation function.Can in RRU, carry out N times of interpolation, and then carry out IFFT, add CP again base band data.So not only improved the spectral resolution of baseband signal but also improved the signals sampling rate,, reduced the distortion of DAC output analog signal, improved the quality that transmits for the further processing of signal provides the foundation.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. OFDM transmission signal processing equipment, comprise RF remote unit, it is characterized in that, described device also comprises Base Band Unit, be used to carry out the data map of medium Access Layer to physical layer, carry out base band data scrambling, chnnel coding, interweave and modulate and send to described RF remote unit;
Described RF remote unit also comprises the base band data post-processing module, is used for the base band data that receives is gone here and there and conversion, interpolation, anti-fast fourier transform, interpolation Cyclic Prefix and and string conversion and output.
2. device as claimed in claim 1 is characterized in that, described Base Band Unit comprises with lower module:
The base band data mapping block is used to carry out the base band data mapping of medium Access Layer to physical layer, and the output of the base band data after will shining upon;
The base band data processing module is used for the base band data that receives is carried out scrambling, chnnel coding, interweaves and modulates and exports;
The baseband interface module, the data that are used for receiving send to described RF remote unit.
3. device as claimed in claim 1 or 2 is characterized in that, described RF remote unit further comprises with lower module:
Radio frequency interface module is used to receive the data that described Base Band Unit sends, and exports to described base band data post-processing module;
The Digital IF Processing module is used to receive the data that described base band data post-processing module is exported, and carries out Digital Up Convert and digital-to-analogue conversion and handles and export;
The radiofrequency signal processing module is used to receive the data of described Digital IF Processing module output, and carries out radiofrequency signal processing and emission.
4. a RF remote unit is characterized in that, comprises with lower module:
Radio frequency interface module is used to receive base band data and output;
The base band data post-processing module is used to receive the base band data of described radio frequency interface module output, and goes here and there and conversion, interpolation, anti-fast fourier transform, interpolation Cyclic Prefix and also string conversion and output;
The Digital IF Processing module is used to receive the data that described base band data post-processing module is exported, and carries out Digital Up Convert and digital-to-analogue conversion and handles and export;
The radiofrequency signal processing module is used to receive the data of described Digital IF Processing module output, and carries out radiofrequency signal processing and emission.
5. the method that OFDM transmits and handles is characterized in that, may further comprise the steps:
Base Band Unit carries out the medium Access Layer to the data map of physical layer, carry out base band data scrambling, chnnel coding, interweave and modulate and send to RF remote unit;
Described RF remote unit is gone here and there by the base band data that receives and conversion, interpolation, anti-fast fourier transform, interpolation Cyclic Prefix and also string conversion, and carries out launching after digital up-conversion and the digital-to-analogue conversion processing.
6. method as claimed in claim 5 is characterized in that, described base band data is sent to before the RF remote unit, earlier control signal and timing information is joined framing in the data;
After described RF remote unit received these frame data, advanced line data was separated frame, mask data.
7. as claim 5 or 6 described methods, it is characterized in that, after carrying out described Digital Up Convert and digital-to-analogue conversion and handling, obtain analog if signal, and analog if signal is made radiofrequency signal handle and be transmitted into wireless channel by antenna.
8. method as claimed in claim 7 is characterized in that, described radiofrequency signal handle comprise to described analog if signal do to amplify, filtering, mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101519006A CN101136811A (en) | 2007-09-28 | 2007-09-28 | OFDM transmission signal processing equipment, method and radio frequency far-end unit |
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| CNA2007101519006A CN101136811A (en) | 2007-09-28 | 2007-09-28 | OFDM transmission signal processing equipment, method and radio frequency far-end unit |
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| CN101136811A true CN101136811A (en) | 2008-03-05 |
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| CNA2007101519006A Pending CN101136811A (en) | 2007-09-28 | 2007-09-28 | OFDM transmission signal processing equipment, method and radio frequency far-end unit |
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| WO2010148898A1 (en) * | 2009-11-18 | 2010-12-29 | 中兴通讯股份有限公司 | Method, device and distributed base station system for transmitting data |
| CN102291855A (en) * | 2010-06-18 | 2011-12-21 | 普天信息技术研究院有限公司 | Method for reducing infrared ray (Ir) interface bandwidth and distributive base station |
| WO2012083718A1 (en) * | 2010-12-21 | 2012-06-28 | 华为技术有限公司 | Method for generating downlink baseband signal, and related device and system |
| CN102742317A (en) * | 2011-11-25 | 2012-10-17 | 华为技术有限公司 | Communication system, communication method and communication apparatus |
| WO2012156874A1 (en) * | 2011-05-17 | 2012-11-22 | Telefonaktiebolaget L M Ericsson (Publ) | Distributed base station with robust packet interface |
| CN102801681A (en) * | 2012-08-01 | 2012-11-28 | 大唐移动通信设备有限公司 | Data transmission method and distributed base station |
| CN103428148A (en) * | 2012-05-25 | 2013-12-04 | 中兴通讯股份有限公司 | Downlink transmitter of LTE base station system and data processing method thereof |
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2007
- 2007-09-28 CN CNA2007101519006A patent/CN101136811A/en active Pending
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| CN102291855A (en) * | 2010-06-18 | 2011-12-21 | 普天信息技术研究院有限公司 | Method for reducing infrared ray (Ir) interface bandwidth and distributive base station |
| WO2012083718A1 (en) * | 2010-12-21 | 2012-06-28 | 华为技术有限公司 | Method for generating downlink baseband signal, and related device and system |
| US8705483B2 (en) | 2010-12-21 | 2014-04-22 | Huawei Technologies Co., Ltd. | Downlink baseband signal generating method, relevant device and system |
| WO2012156874A1 (en) * | 2011-05-17 | 2012-11-22 | Telefonaktiebolaget L M Ericsson (Publ) | Distributed base station with robust packet interface |
| CN103891394A (en) * | 2011-10-01 | 2014-06-25 | 英特尔公司 | Remote radio unit (rru) and base band unit (bbu) |
| EP2761972A4 (en) * | 2011-10-01 | 2015-08-12 | Intel Corp | Remote radio unit (rru) and base band unit (bbu) |
| CN102742317A (en) * | 2011-11-25 | 2012-10-17 | 华为技术有限公司 | Communication system, communication method and communication apparatus |
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| CN103428150A (en) * | 2012-05-25 | 2013-12-04 | 中兴通讯股份有限公司 | Downlink transmitter of long term evolution (LTE) base station system and data processing method of downlink transmitter |
| CN103428149A (en) * | 2012-05-25 | 2013-12-04 | 中兴通讯股份有限公司 | Uplink receiver of LTE base station system and data processing method thereof |
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| CN107113146A (en) * | 2014-12-19 | 2017-08-29 | 英特尔Ip公司 | Remote radio unit and Base Band Unit for the processing of asymmetric radio areas network channel |
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| CN107113146B (en) * | 2014-12-19 | 2020-10-16 | 英特尔Ip公司 | Remote radio unit and baseband unit for asymmetric radio area network channel processing |
| CN107615876B (en) * | 2015-07-07 | 2020-04-21 | 华为技术有限公司 | System and method for RRU control messaging architecture for massive MIMO systems |
| WO2017005005A1 (en) * | 2015-07-07 | 2017-01-12 | Huawei Technologies Co., Ltd. | Systems and methods for rru control messaging architecture for massive mimo systems |
| CN107615876A (en) * | 2015-07-07 | 2018-01-19 | 华为技术有限公司 | The system and method that RRU control messages for extensive mimo system transmit framework |
| US10044417B2 (en) | 2015-07-07 | 2018-08-07 | Huawei Technologies Co., Ltd. | Systems and methods for RRU control messaging architecture for massive MIMO systems |
| WO2017032411A1 (en) * | 2015-08-25 | 2017-03-02 | U-Blox Ag | Modem apparatus, communications system and method of processing subcarriers |
| US10680869B2 (en) | 2015-08-25 | 2020-06-09 | u-box AG | Modem apparatus, communications system and method of processing subcarriers |
| CN108028747A (en) * | 2015-08-25 | 2018-05-11 | 瑞士优北罗股份有限公司 | Modem apparatus, communication system and the method for handling subcarrier |
| CN107528669A (en) * | 2016-06-22 | 2017-12-29 | 中兴通讯股份有限公司 | Data transmission method and microwave transmission unit |
| CN108834153A (en) * | 2018-09-27 | 2018-11-16 | 京信通信系统（中国）有限公司 | A kind of cell wireless shrouding system and method |
| CN112564769A (en) * | 2020-11-30 | 2021-03-26 | 东方红卫星移动通信有限公司 | Low-orbit satellite high-speed communication method with multi-rate hierarchical adjustment, transmitting end, receiving end and system |
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