CN101478812B - Digital predistortion apparatus suitable for TD-SCDMA time-division system - Google Patents
Digital predistortion apparatus suitable for TD-SCDMA time-division system Download PDFInfo
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- CN101478812B CN101478812B CN2008100556017A CN200810055601A CN101478812B CN 101478812 B CN101478812 B CN 101478812B CN 2008100556017 A CN2008100556017 A CN 2008100556017A CN 200810055601 A CN200810055601 A CN 200810055601A CN 101478812 B CN101478812 B CN 101478812B
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Abstract
The invention relates to the digital pre-distortion device used in the base station equipment of the timing system, including the RF Ministry and the interface control division, a power amplifier and a filter module with an antenna interface connected in sequence. The device also includes: a reuse RF channel and Interface Control Division, the detection channel formed by the downlink receiving channel of the power amplifier which is used for detecting the inter-modulation and the inter-modulation component, derive the power amplifier characteristics and do the digital pre-distortion calculation and the compensation of the base-band sending signal in the RF channel and Interface Control Division. The invention can reduce the leakage ratio between the adjacent channels, increase the power amplifier efficiency and achieve the purpose of reducing the power amplifier cost and improving the efficiency.
Description
Technical field
The present invention relates to the base station equipment in a kind of mobile communication, specifically relate to a kind of digital predistortion apparatus of the TD-SCDMA of being applicable to time-division system.
Background technology
Along with the extensive commercialization of 3G day by day closes on, TD-SCDMA will become China as the 3G standard of China, and first has the standard of 3G license, so the commercialization process of TD-SCDMA system is more apparent urgent.The commercial prospect of TD-SCDMA is bright and clear day by day simultaneously.In TD product competition in the future, for communication base station equipment manufacturers, cost can become main focus.The power amplifier of communication system use now is to be operated in linear district, and the power amplifier type is an AB class power amplifier, and efficient is on the low side, for high peak-to-average force ratio input signal, want to make power amplifier to be operated in linear district, the average power of input signal just must reduce, and the power amplifier power output also can reduce simultaneously.Guaranteeing that power amplifier is operated under the linear situation, want to improve the power amplifier power output, just must adopt powerful pipe, but the cost of powerful power amplifier pipe is very high, and caloric value is higher.For under the situation that guarantees equal-wattage output, reduce cost, improve power amplification efficiency, just must adopt the DPD technology, most of that DPD (digital pre-distortion integrated circuit) framework all is additionally to increase passage and hardware, time-division system system at picture TD-SCDMA, transmitting-receiving is timesharing, the characteristic of positive good utilisation timesharing, multiplexing receive path, hardware be can significantly reduce, reception and sampling that the required power amplifier of DPD computing transmits finished simultaneously.
Summary of the invention
DPD framework of the present invention is a kind of in the communication, TD-SCDMA particularly, in the time-division systems such as WIMAX, utilize this DPD framework to utilize detection branch, multiplexing receive path reaches reduction because the device intermodulation distortion causes high neighboring trace leakage power in conjunction with the DPD algorithm simultaneously, improves the efficient of power amplifier, thereby make power amplifier under the condition of the output ACLR that allows, export higher power.
The invention provides a kind of digital predistortion apparatus that is used for the time-division system base station equipment, comprise the middle radio-frequency channel and the interface control part that connect successively, power amplifier portion and the filtering unit that has antennal interface, also comprise: a multiplexing described middle radio-frequency channel and an interface control part, uplink receiving channel in the described power amplifier portion and the sense channel that forms, be used to detect the intermodulation and the intermodulation component of described power amplifier portion output signal, thereby derive the power amplifier characteristic of described power amplifier portion, and radio-frequency channel and interface control part carry out digital pre-distortion computing and baseband transmit signals compensation in described.
Described sense channel comprises:
One passage diverter switch, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used to realize described sense channel and the normally switching between the receive path, when emission state, described passage diverter switch is connected described sense channel;
One radio frequency diverter switch is arranged in the uplink receiving channel of described power amplifier portion, is used to realize the switching between described sense channel and the normal receive path, and when emission state, described radio frequency diverter switch is connected described sense channel.
One analog to digital converter, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used for when emission state providing wideband section modulus sampled data, to satisfy described digital pre-distortion computing needs according to described power amplifier portion output signal;
One digital pre-distortion computing and compensation section is arranged at FPGA inside, is used to realize the compensation of digital pre-distortion computing and baseband transmit signals.
Described passage diverter switch comprises that first diverter switch, second diverter switch and two ends are connected the if bandpas filter of described first diverter switch and second diverter switch respectively, described first diverter switch be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel between an intermediate frequency amplifier and the numerical-control attenuator, described second diverter switch is arranged in described middle radio-frequency channel and the interface control part in the uplink receiving channel between the intermediate frequency amplifier and frequency mixer.
Described radio frequency diverter switch comprises the first radio frequency diverter switch and the second radio frequency diverter switch, the described first radio frequency diverter switch, one side connects the directional coupler of described power amplifier subordinate row sendaisle and the directional coupler of described power amplifier portion uplink receiving channel respectively, opposite side connects the described second radio frequency diverter switch, described second radio-frequency (RF) switch be arranged on described power amplifier portion uplink receiving channel if bandpas filter and described between the if bandpas filter of radio-frequency channel and interface control part uplink receiving channel.
Described analog to digital converter comprises: analog to digital conversion module, data buffer, the 3rd diverter switch, digital signal processing module and output interface module, described analog to digital conversion module, data buffer, the 3rd diverter switch are connected successively with output interface module, and described digital signal processing module connects described data buffer and the 3rd diverter switch respectively.
Described the 3rd diverter switch is switched according to emission or accepting state, and described output interface module is with the 11bit dateout when emission state, and described output interface module is with the 14bit dateout when accepting state; The bandwidth of the AD sampled data of 11 bits satisfies the occupied bandwidth of 7 intermodulations of signal; The data bandwidth of 11 bit dateouts is greater than the data bandwidth of 14 Bit datas.
Digital pre-distortion computing and compensation section, comprise: Digital Up Convert module, peak-clipping module, digital pre-distortion module, transceiver toggle switch and Digital Down Converter Module, described Digital Up Convert module is connected to described digital pre-distortion module by described peak-clipping module, described Digital Down Converter Module is connected to described digital pre-distortion module by described transceiver toggle switch, described digital pre-distortion module connects the digital to analog converter of descending sendaisle, and described transceiver toggle switch is connected to the analog to digital converter of uplink receiving channel.
The invention provides a kind of base station equipment that is used for time-division system, comprise successively middle radio-frequency channel and interface control part, the power amplifier portion that connects and have the filtering unit of antennal interface, also comprise: one multiplexing described in uplink receiving channel and the sense channel that forms in radio-frequency channel and interface control part, the described power amplifier portion, be used to detect the intermodulation and the intermodulation component of described power amplifier portion output signal, thereby derive the power amplifier characteristic of described power amplifier portion, and radio-frequency channel and interface control part carry out digital pre-distortion computing and baseband transmit signals compensation in described.
Described sense channel comprises:
One passage diverter switch, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used to realize described sense channel and the normally switching between the receive path, when emission state, described passage diverter switch is connected described sense channel;
One radio frequency diverter switch is arranged in the uplink receiving channel of described power amplifier portion, is used to realize the switching between described sense channel and the normal receive path, and when emission state, described radio frequency diverter switch is connected described sense channel.
One analog to digital converter, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used for when emission state providing wideband section modulus sampled data, to satisfy described digital pre-distortion computing needs according to described power amplifier portion output signal;
One digital pre-distortion computing and compensation section is arranged at FPGA inside, is used to realize the compensation of digital pre-distortion computing and baseband transmit signals.
Described time-division system is TD-SCDMA or WIMAX system.
This framework is the system architecture of the DPD of time-division system, receive and dispatch normally in the assurance system under the prerequisite of work, utilize the road (with the shared most of hardware of normal receive path) of detection branch or calibration, detect the intermodulation and the intermodulation component of power amplifier output signal, thereby derive the characteristic of power amplifier, do the DPD computing in base band then, thereby reach the reduction ACLR, improve power amplification efficiency, this framework can be under the advantage of multiplexing a part of receive path hardware (recruitment of hardware seldom), reach and reduce power amplifier cost, the purpose of raising the efficiency.
Description of drawings
The DPD system block diagram of Fig. 1 TD-SCDMA;
FPGA finishes the framework of DPD compensated part in Fig. 2 time-division system;
The ADC structure of shared reception path in Fig. 3 time-division system.
Embodiment
This DPD framework part of the present invention as shown in Figure 1, according to the characteristics of time-division systems such as TD-SCDMA, multiplexing receive path in receive-transmit system is finished the collection of the signal of DPD.This framework is divided into 3 parts, middle radio-frequency channel and interface control section K1, power amplifier and LNA Partial K 2, filtering unit Partial K 3.
Below the specific implementation of detailed introduction inside.
Be divided into up-downgoing path, sequencing control, data-interface in the K1 part.Uplink is to receive path, and downlink is a transmission path, and sequencing control partly is that the management and the up-downgoing data of control timing send, and data-interface partly is the base band frame data that receive the light mouth and send the light mouth.Uplink comprises 102,104,106,107,108,110,111,112.The 102nd, digital up converter, the 104th, high-speed DAC carries out digital to analog conversion, and the 106th, if bandpas filter.The 107th, intermediate frequency amplifier, the 108th, numerical-control attenuator, the 110th, the frequency mixer uppermixing is to radio frequency, and the 111st, radio frequency band filter, the 112nd, radio frequency amplifier; Downlink comprises 103,105,121,107,109,108,106,110,111.The 103rd, digital down converter, the 105th, the ADC of the high sampling clock in broadband, the 121st, the intermediate frequency low pass filter, the 109th, the passage diverter switch is used for sense channel and normal receive path switches; The 101st, FPGA, in weave into and finish data arrangement conversion, the transmitting-receiving sequencing control; The 100th, the optical interface part of data is finished the base band data that receives optical interface, sends base band data to optical interface.
K2 is power amplifier and LNA part, is divided into downlink radio frequency sendaisle (comprising sense channel) and up radio frequency reception channel part.The downlink radio frequency sendaisle comprises 113,111,118,119.The 113rd, put in advance, shift radiofrequency signal onto power amplifier required input power.The 111st, radio frequency band filter.The 118th, power amplifier.The 119th, directional coupler, coupler has coupling channel, can be coupled out a part of signal power on the primary path.Up radio frequency reception channel comprises 109,111,115,116,119.The 109th, radio-frequency (RF) switch is used for and normal receive path switches, and when emission, diverter switch can be got to sense channel.The 115th, LNA is used to amplify the weak signal signal of reception antenna.The 107th, circulator, for the time-division system common antenna, circulator is used for transmitting-receiving and isolates.
K3 is the filtering unit part, comprises 120.The 120th, cavity body filter and antenna butt joint suppress the emission band external radiation, suppress the interference of close frequencies simultaneously.
In the shared part of digital side mainly is the AD device, just because of at getting time-division system, the use that can stagger AD in time.TD-SCDMA system or other time-division systems, down-conversion all merges in FPGA inside and finishes on the up-downgoing system digits, and the DPD algorithm also merges in this FPGA inside simultaneously.Module 200 is FPGA modules, and inside comprises 201,202,203,204,205; The 210th, digital to analog converter, the 220th, analog to digital converter.The 201st, Digital Up Convert module, the 202nd, peak-clipping module, the 203rd, digital pre-distortion module, the 204th, Digital Down Converter Module, the 205th, diverter switch.In descending transmission signal, the signal that switch receives ADC switches on the DPD module, makes the signal that receives handle in the DPD module, and descending transmission data are also handled in DPD simultaneously.The signal that DPD handles is delivered to the DAC module and is sent.When up reception, switch switches to the DDC module of normal reception, handles.In the FPGA 205 is subjected to receiving and dispatching the control of switching
The ADC module of up acceptance also will have handoff functionality according to the characteristics of time-division and multiplexing requirement.The ADC internal structure comprises 301,302,303,304,305.The 301st, pure analog to digital conversion part, the 302nd, the metadata cache part, the 303rd, the digital processing part mainly is to be used for limiting bandwidth, the 304th, diverter switch is controlled by transceiver toggle switch, and that switch output is 11bit, or 14bit, the 305th, output interface is for making things convenient for the outbound data interface.Such ADC structure is for shared receive path.When emission, switch switches to 11bit output, during reception, switches to 14bit output.
For time-division system, in whole transmitting-receiving path, just comprised sense channel, when signaling, normal receive path is not opened, and sense channel is opened, and a part of power that sends signal is coupled, and surveys in numeral and detects calibration.In sense channel, do not have active amplifying circuit, can better reflect the power amplifier output characteristic like this.So on hardware,, receive the power amplifier signal with regard to multiplexing sense channel, to carry out DPD then and analyze, baseband transmit signals is given in compensation, thus the compensation power amplifier is non-linear.
Claims (10)
1. digital predistortion apparatus that is used for the time-division system base station equipment, comprise the middle radio-frequency channel and the interface control part that connect successively, power amplifier portion and the filtering unit that has antennal interface, it is characterized in that, also comprise: a multiplexing described middle radio-frequency channel and an interface control part, uplink receiving channel in the described power amplifier portion and the sense channel that forms, be used to detect the intermodulation and the intermodulation component of described power amplifier portion output signal, thereby derive the power amplifier characteristic of described power amplifier portion, and radio-frequency channel and interface control part carry out digital pre-distortion computing and baseband transmit signals compensation in described.
2. digital predistortion apparatus according to claim 1 is characterized in that, described sense channel comprises:
One passage diverter switch, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used to realize described sense channel and the normally switching between the receive path, when emission state, described passage diverter switch is connected described sense channel;
One radio frequency diverter switch is arranged in the uplink receiving channel of described power amplifier portion, is used to realize the switching between described sense channel and the normal receive path, and when emission state, described radio frequency diverter switch is connected described sense channel.
One analog to digital converter, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used for when emission state providing wideband section modulus sampled data, to satisfy described digital pre-distortion computing needs according to described power amplifier portion output signal;
One digital pre-distortion computing and compensation section is arranged at FPGA inside, is used to realize the compensation of digital pre-distortion computing and baseband transmit signals.
3. digital predistortion apparatus according to claim 2, it is characterized in that, described passage diverter switch comprises that first diverter switch, second diverter switch and two ends are connected the if bandpas filter of described first diverter switch and second diverter switch respectively, described first diverter switch be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel between an intermediate frequency amplifier and the numerical-control attenuator, described second diverter switch is arranged in described middle radio-frequency channel and the interface control part in the uplink receiving channel between the intermediate frequency amplifier and frequency mixer.
4. digital predistortion apparatus according to claim 2, it is characterized in that, described radio frequency diverter switch comprises the first radio frequency diverter switch and the second radio frequency diverter switch, the described first radio frequency diverter switch, one side connects the directional coupler of described power amplifier subordinate row sendaisle and the directional coupler of described power amplifier portion uplink receiving channel respectively, opposite side connects the described second radio frequency diverter switch, described second radio-frequency (RF) switch be arranged on described power amplifier portion uplink receiving channel if bandpas filter and described between the if bandpas filter of radio-frequency channel and interface control part uplink receiving channel.
5. digital predistortion apparatus according to claim 2, it is characterized in that, described analog to digital converter comprises: analog to digital conversion module, data buffer, the 3rd diverter switch, digital signal processing module and output interface module, described analog to digital conversion module, data buffer, the 3rd diverter switch are connected successively with output interface module, and described digital signal processing module connects described data buffer and the 3rd diverter switch respectively.
6. digital predistortion apparatus according to claim 5, it is characterized in that, described the 3rd diverter switch is switched according to emission or accepting state, described output interface module is with 11 bit dateouts when emission state, and described output interface module is with 14 bit dateouts when accepting state; The bandwidth of the AD sampled data of 11 bits satisfies the occupied bandwidth of 7 intermodulations of signal; The data bandwidth of 11 bit dateouts is greater than the data bandwidth of 14 Bit datas.
7. according to claim 2,3,4,5 or 6 described digital predistortion apparatus, it is characterized in that, digital pre-distortion computing and compensation section, comprise: the Digital Up Convert module, peak-clipping module, the digital pre-distortion module, transceiver toggle switch and Digital Down Converter Module, described Digital Up Convert module is connected to described digital pre-distortion module by described peak-clipping module, described Digital Down Converter Module is connected to described digital pre-distortion module by described transceiver toggle switch, described digital pre-distortion module connects the digital to analog converter of descending sendaisle, and described transceiver toggle switch is connected to the analog to digital converter of uplink receiving channel.
8. base station equipment that is used for time-division system, comprise successively middle radio-frequency channel and interface control part, the power amplifier portion that connects and have the filtering unit of antennal interface, it is characterized in that, also comprise: one multiplexing described in uplink receiving channel and the sense channel that forms in radio-frequency channel and interface control part, the described power amplifier portion, be used to detect the intermodulation and the intermodulation component of described power amplifier portion output signal, thereby derive the power amplifier characteristic of described power amplifier portion, and radio-frequency channel and interface control part carry out digital pre-distortion computing and baseband transmit signals compensation in described.
9. the base station equipment that is used for time-division system according to claim 8 is characterized in that, described sense channel comprises:
One passage diverter switch, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used to realize described sense channel and the normally switching between the receive path, when emission state, described passage diverter switch is connected described sense channel;
One radio frequency diverter switch is arranged in the uplink receiving channel of described power amplifier portion, is used to realize the switching between described sense channel and the normal receive path, and when emission state, described radio frequency diverter switch is connected described sense channel.
One analog to digital converter, be arranged at described in radio-frequency channel and the interface control part in the uplink receiving channel, be used for when emission state providing wideband section modulus sampled data, to satisfy described digital pre-distortion computing needs according to described power amplifier portion output signal;
One digital pre-distortion computing and compensation section is arranged at FPGA inside, is used to realize the compensation of digital pre-distortion computing and baseband transmit signals.
10. the base station equipment that is used for time-division system according to claim 8 is characterized in that, described time-division system is TD-SCDMA or WIMAX system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100556017A CN101478812B (en) | 2008-01-03 | 2008-01-03 | Digital predistortion apparatus suitable for TD-SCDMA time-division system |
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| CN2008100556017A CN101478812B (en) | 2008-01-03 | 2008-01-03 | Digital predistortion apparatus suitable for TD-SCDMA time-division system |
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| CN101478812B true CN101478812B (en) | 2011-10-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2926480A4 (en) * | 2012-11-30 | 2016-11-02 | Intel Corp | Built-in passive intermodulation detector for base station equipment |
| CN104486282B (en) * | 2014-12-15 | 2018-02-13 | 成都康特数字广播电视设备有限公司 | Radio frequency multicarrier intermodulation restraining device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1131848A (en) * | 1994-11-30 | 1996-09-25 | 索尼公司 | Transmitting-receiving apparatus |
| CN1335699A (en) * | 2000-07-20 | 2002-02-13 | 华为技术有限公司 | Adaptive digital pre-distortion method and device for wideband transmitter |
| CN1988522A (en) * | 2005-12-20 | 2007-06-27 | 中兴通讯股份有限公司 | Multiple path multiple carrier digital pre-distortion sender of wideband CDMA base station system |
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- 2008-01-03 CN CN2008100556017A patent/CN101478812B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1131848A (en) * | 1994-11-30 | 1996-09-25 | 索尼公司 | Transmitting-receiving apparatus |
| CN1335699A (en) * | 2000-07-20 | 2002-02-13 | 华为技术有限公司 | Adaptive digital pre-distortion method and device for wideband transmitter |
| CN1988522A (en) * | 2005-12-20 | 2007-06-27 | 中兴通讯股份有限公司 | Multiple path multiple carrier digital pre-distortion sender of wideband CDMA base station system |
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