CN1423493A - Signal receiving method and apparatus in wireless base station - Google Patents
Signal receiving method and apparatus in wireless base station Download PDFInfo
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- CN1423493A CN1423493A CN 01142604 CN01142604A CN1423493A CN 1423493 A CN1423493 A CN 1423493A CN 01142604 CN01142604 CN 01142604 CN 01142604 A CN01142604 A CN 01142604A CN 1423493 A CN1423493 A CN 1423493A
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Abstract
The invention relates to a method and device for receiving signal in wireless base station, which converts the upstream signal to high intermediate frequency signal through the front of analogue radio wide band by the antenna of the base station. After being sampled digitally by high speed A/D, multi-path digital channel signals are send to the PLC digital down frequency conversion circuit and divided into multi-path base band orthogonal signals, The after software base band processing based on the base band digital signal processing technology, the bit flow is formed and send to BSC (base station controller) for further processing. In the device, a radio frequency front processing module, a high speed wide band A/D converter, a PLC digital down frequency conversion module and a base band digital signal processing module are connected in order.
Description
Technical field
The invention belongs to moving communicating field, particularly relate to a kind of wireless base station signal method of reseptance and device based on the baseband digital signal treatment technology.
Background technology
Along with the continuous development of present mobile communication technology, in the current mobile communication market, multiple system coexistence, New System continues to bring out, and this just makes troubles to developer and user.Present communication system constantly to the transition of digitlization system, more helps making communication system to adopt standardization, modular structure by the simulation system.At a high speed, the appearance of high performance hardware, the mode by software loading realizes that with software hardware capability has as much as possible become possibility.
In field of mobile communication, though the technology comparative maturity of digital receiver, they generally can only work in single frequency range and pattern, and function is less relatively, and flexibility is not enough, and expandability and receiving sensitivity are also limited.
The following describes the signal receiving course of the wireless base station receiving system in the above-mentioned conventional mobile communication system.At first the radiofrequency signal that antenna is received is passed through bandpass filtering, low noise amplifies, again through frequency mixer repeatedly mixing produce intermediate-freuqncy signal (hundreds of MHz), to intermediate-freuqncy signal amplify, after filtering, gain controlling amplifies AGC and handles, baseband I, Q analog signal by analog signal quadrature demodulation output orthogonal, obtain digital signal through filtering, amplification and ADC analog/digital conversion, enter the baseband digital signal processing module and carry out Digital Signal Processing.
Signal receiving device in conventional mobile communication system wireless base station, usually adopt in base band the sample method that quantizes of the analog signal of lower passband limit is realized the digitlization of received signal, receiver is not had change the flexibility of channel width, can not solve simulation receive link problems such as the complicated and production cost height of intrinsic design.Wherein, the centre frequency of general filter and bandwidth are normally fixed, and realize the filter that performance is accurate, index is stable, owing to use analogue device many, realize circuit with regard to more complicated, the corresponding raising of production cost; Owing to adopted more narrow band filter in the receive path, make signal very big through the width of cloth phase distortion of introducing behind the passage, reduced signal noise ratio and dynamic range, have a strong impact on the quality of reprocessing.Simultaneously, if with conventional demodulation device, its demodulation mode and code stream form are fixed, the shortage flexibility; And, make the multichannel receive diversity mostly adopt the selection deversity scheme because its code stream that demodulates generally can not parallel processing, can not adopt the better diversity algorithm of other diversity to improve the receiving sensitivity of system.Simultaneously the complexity of hardware makes the volume, weight, function etc. of receiver can not be satisfactory.
Summary of the invention
One of the technical problem to be solved in the present invention is to propose to utilize in a kind of mobile communication base station the baseband digital signal treatment technology to realize the digital receive method of Wideband Intermediate Frequency bandpass sampling.This method is transformed to high intermediate-freuqncy signal to upward signal through the analog radio frequency wideband frontend by antenna for base station, after carrying out digitized sampling by high-speed a/d, give programmable Digital Down Convert circuit the multi-path digital channel signal simultaneously, be broken down into multichannel base band orthogonal signalling; After carrying out the software implementation Base-Band Processing based on the baseband digital signal treatment technology again, the generation bit stream is given BSC (base station controller) and is carried out subsequent treatment.
Two of the technical problem to be solved in the present invention is to propose a kind of signal receiving device of realizing said method.
A kind of signal receiving device provided by the invention is to realize with following technical scheme, comprising:
The radio-frequency front-end processing module (21) of Lian Jieing successively, high-speed wideband analog/digital converter (22), programmable digital down-converter module (23), baseband digital signal processing module (24);
Described radio-frequency front-end processing module (21), utilize antenna to receive wireless signal, be sent to band pass filter (211), after handling through first low noise amplifier (212), frequency mixer (213), if bandpas filter (214), second low noise amplifier (215) successively, output signal is delivered to high-speed wideband analog/digital converter (22);
Described programmable digital down-converter module (23) comprises digital controlled oscillator (231), is used to produce the pair of orthogonal local oscillation signal, delivers to digital multiplier (232), and being used for frequency to be processed in the digital intermediate frequency signal of every road is f
iThe signal in orthogonal numeral be decomposed into two digital orthogonal baseband signal I and Q, realize data pick-up through cascade integral comb filter (233) again, the data that are extracted are carried out shaping filter through wave digital lowpass filter (234) again, and parallel/serial conversion and the buffering that data fifo buffering area (235) carries out data is sent in its output;
Described baseband digital signal processing module (24) comprises the digital demodulation unit (241) that is linked in sequence, symbol synchronization adjustment unit (242), maximum ratio merge diversity unit (243), code element extracting unit (244), associating soft-decision and bit stream string and conversion processing unit (245).
The present invention proposes a kind of method of utilizing the baseband digital signal treatment technology to realize the digital received of Wideband Intermediate Frequency bandpass sampling, comprises the steps:
Step 1: radio frequency analog signal is mixed down high analog intermediate frequency signal;
Step 2: high analog intermediate frequency signal is carried out high-speed wideband A/D sampling;
Step 3: digital intermediate frequency signal is carried out Digital Down Convert handle;
Step 4: the zero intermediate frequency complex signal is carried out a series of Digital Signal Processing.
Description of drawings
The present invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is digital received process flow figure of the present invention;
Fig. 2 is the digital receiver device structure chart in a kind of wireless base station provided by the present invention.
Fig. 3 is the flow chart of baseband digital signal of the present invention processing section.
Embodiment
Generally to be that frequency range is very wide (be generally the radiofrequency signal of 0.1MHz～2.2GHz) to the upward signal that receives from antenna, the performance of A/D converter is difficult to reach high-frequency like this signal is carried out Direct Sampling at present, and the subsequent treatment device also is difficult to meet the demands.So what the present invention proposed carries out the Wideband Intermediate Frequency bandpass sampling to radiofrequency signal, is a practical processing method.
According to shown in Figure 1, method set forth in the present invention can realize by following several steps:
Step 1 (102): radio frequency analog signal is mixed down high analog intermediate frequency signal.
The upward signal of reception antenna through band pass filter 211 filtering out of band signals, is amplified and frequency mixer 213 mixing by first low noise amplifier 212, and it is f that radiofrequency signal is transformed into centre frequency
0, bandwidth is B
0The Wideband Intermediate Frequency signal; Through intermediate-frequency filter 214 filtering image frequencies, include a plurality of channels (number of channel=intermediate-frequency bandwidth/signal bandwidth) in this intermediate-frequency bandwidth again, carried out intermediate frequency by second low noise amplifier 215 at last and be amplified to the signal level that subordinate handles.
Step 2 (103): high analog intermediate frequency signal is carried out high-speed wideband A/D sampling.
This step is that the high analog intermediate frequency signal of delivering to high-speed wideband analog/digital converter 22 is carried out analog/digital conversion.Wherein sampling rate (by the signal bandwidth decision) and the sampling precision (by the dynamic range decision of signal) to A/D converter has certain requirement.The development of large scale integrated circuit technology at present, the performance of commercial AD converter part can satisfy this requirement.By selecting for use suitable AD device to quantize, produce digital intermediate frequency signal to high intermediate frequency analog signal sampling.
Step 3 (104): digital intermediate frequency signal is carried out Digital Down Convert handle;
The multichannel digital intermediate frequency signal realizes that through programmable digital down-converter module 23 quadrature of signal decomposes and extraction.At first, by digital controlled oscillator NCO (231), produce pair of orthogonal local oscillation signal cos (win) and sin (win), frequency to be processed is f in 2N digital multiplier 232 (N is a port number) finished digital intermediate frequency signal
iThe orthogonal digital of signal decompose, every passage produces two-way digital orthogonal baseband signal I and Q; Through a cascade integral comb filter 233, realize the extraction of data then.The signal that is extracted carries out shaping filter through wave digital lowpass filter 234 again, and the exponent number of digital low-pass filtering is controlled by baseband digital signal processing module 24; Filtered signal enters data fifo buffering area 235 again, and it realizes that Q signal cushions and parallel/serial conversion to multichannel I, produces the zero intermediate frequency baseband I, the Q digital signal.
Step 4 (105): the zero intermediate frequency complex signal is carried out a series of Digital Signal Processing.
The realization of this step mainly is to finish in high speed digital signal processor.(I Q) carries out digital demodulation, symbol synchronization adjustment, maximum ratio merging diversity, code element extraction, associating soft-decision and bit stream string and conversion process to the multichannel complex signal respectively; Form is injected into the signaling process part with code stream on request then, finishes the entire process process from the radiofrequency signal to the baseband signal.
Figure 2 shows that a kind of digital receiver device structure chart provided by the invention (the two-way antenna that only draws among Fig. 2 receives, the structure chart of a slice AD6600 binary channels sampling).
The upward signal 2110 of at first every road reception antenna passes through band pass filter 211 respectively, amplifies and the frequency mixer mixing through LNA, and being transformed into centre frequency is f
0, bandwidth is B
0The high intermediate-freuqncy signal in broadband.Local frequency in the frequency mixer 213 here is f
L, should satisfy f
L=f
i± f
0, in the formula, f
iBe frequency input signal, f
0Be centre frequency, when getting "+" number, adopt high local oscillator, adopt low local oscillator when getting "-"; And, include a plurality of channels (number of channel=intermediate-frequency bandwidth/signal bandwidth) in this high intermediate-frequency bandwidth signal through if bandpas filter 214 filtering image frequencies; Carried out intermediate frequency by second low noise amplifier 215 at last and amplify that become can be by the signal 2111 of subordinate's cell processing.This signal 2111 flow in the high-speed wideband analog/digital converter 22, the described high-speed wideband analog/digital revolving die piece 22 of this device adopts the AD6600 (221) of ADI company, and this chip can carry out the binary channels Direct Sampling to the intermediate-freuqncy signal of 70MHz～250MHz; The highest 20MSPS of single channel sample rate, the highest 10MSPS of each passage of binary channels; Its inner prime input has comprised the AGC control circuit, and total signal input range is 90dB; The figure place of AD converter is 11, also has 3 RSSI signals of gain of received signal indication in addition, can carry out the parameter setting to it by programmable digital down-converter module 23.
This device can have been realized the four-way sampling by two AD6600 (221); The digital intermediate frequency signal that sampling obtains flows into programmable digital down-converter module 23.
At first, by digital controlled oscillator (NCO) 231, producing pair of orthogonal local oscillation signal cos (win) and sin (win) through digital multiplier 232, is frequency to be processed in the digital intermediate frequency signal of every road f respectively
iSignal in orthogonal digital signal numeral be decomposed into two digital orthogonal baseband signals (I, Q).Consider the real-time of processing, realize extraction to the local oscillator data by look-up table, as addressing of address, the parameter of NCO can be provided with by described baseband digital signal processing module 24 with phase-accumulated angle; Realize data pick-up through a cascade integral comb filter 233 again, this cascade integral comb filter 233 has used two-stage cascade, wherein the first order is second order integration pectination (CIC) filter, the second level is five rank integration pectinations (CIC) filters, it extracts coefficient and can be provided with by baseband digital signal processing module 24, the data that are extracted realize shaping filter through wave digital lowpass filter 234 again, can effectively reduce spectral aliasing.What this wave digital lowpass filter 234 used is the Square-root Raised Cosine low pass filter of 20 rank α=0.5, and the exponent number of its realization can be controlled by baseband digital signal processing module 24, and filter coefficient is stored among the RAM of programming device (FPGA).Then, the data fifo buffering area 235 that the multichannel quadrature I that decomposition gets, Q signal are opened up at FPGA is realized the parallel/serial conversion and the buffering of data, generates and is convenient to the processing speed of subordinate's digital signal processor (baseband digital signal processing module 24) and every road zero intermediate frequency quadrature I/Q complex signal 2112 of data format.
Programmable digital down-converter module 23 in this device realizes by high speed on-site programmable device FPGA design, and characteristics such as make full use of its high speed low consumption, concurrency and dynamically reconfigure realize the processing to every road digital intermediate frequency signal.
Systematically introduce operation principle of the present invention below.
At first from the band pass filter (211) in the upward signal process radio-frequency front-end processing module (21) of reception antenna, filter out out of band signal, amplify through first low noise amplifier (212) then, through frequency mixer (213) mixing, it is f that radiofrequency signal is transformed to centre frequency
0, bandwidth is B
0The high intermediate-freuqncy signal in broadband (in the different mobile communication system, f
0And B
0Different), and through if bandpas filter (214) filtering image frequency, be amplified to subordinate by second low noise amplifier (215) at last and handle required signal level;
The multichannel analog intermediate frequency signal carries out the intermediate frequency sub-sampling through high-speed wideband analog/digital converter (22), and does AGC control before sampling, produces digital intermediate frequency signal, according to the bandpass signal sampling theory, and the ADC sample frequency f here
sShould satisfy
N is a positive integer; Digital intermediate frequency signal flows into programmable digital down-converter module (23).At first, digital intermediate frequency signal carries out digital mixing with the orthogonal local oscillation signal that is provided by digital controlled oscillator (231) in digital multiplier (232) after, be broken down into the I of quadrature, Q two branch roads extract through cascade integral comb filter (233) again, and after wave digital lowpass filter (234) shaping, inflow data fifo buffering area (235) carries out and goes here and there and change and the data preliminary treatment, produce zero intermediate frequency I, the Q digital signal is so that the follow-up baseband digital signal that carries out is handled.In baseband digital signal processing module (24), (form type code stream on request is injected into the signaling process part for I, a series of digital signal processing methods Q) to finish the multichannel zero intermediate frequency complex signal of being injected by (23).Simultaneously, in baseband digital signal processing module (24), high-speed wideband analog/digital converter (22) and programmable digital down-converter module (23) are carried out parameter configuration and control.
Can realize by following several steps according to baseband digital signal process chart shown in Figure 3:
Full-fledged along with the baseband digital signal treatment technology, the commercial baseband digital signal process chip of a large amount of excellent performances be in marketing, and the baseband digital signal treatment technology in the application of communication field more and more widely.Adopt high speed baseband digital signal process chip to realize a plurality of digital signal processing methods in this device.
The first step (302), every road zero intermediate frequency quadrature I/Q complex signal 2112 is finished digital demodulation through the digital demodulation unit 241 in the baseband digital signal processing module 24; In baseband digital signal processing module 24, can decide the digital demodulation method that is adopted according to system requirements.This device is selected π/4DQPSK digital demodulation method for use, in order to save computational resource, realize handling in real time high speed signal, synchronous adjustment unit 242 and digital demodulation are combined, when realization is synchronous, finish demodulation, again can be according to the demodulating error that estimates to adjusting synchronously.Concrete grammar is: if the sampling number of every code element is n, when just beginning to receive data, chooses a continuous n sampling point earlier and be assumed to a code element, for the parameter L of each sampled point
j(0≤j＜n) carry out pre-demodulating determines and L
jThe pairing standard value L ' of constellation point that distance is minimum
j, the signal demodulating error is Δ L
j=L
j-L '
j, the sampling point of Select Error minimum makes signal reach synchronously thick as accurate optimum.In order to reduce the interference of white noise, usually m code element asked mean error, this method adopts minimum mean square error criterion (MMSE) to weigh.Promptly select to satisfy
K group sampling point as the accurate optimum sampling point of this m code element.In the following formula, L
IjBe the parameter L of j sampled point of i code element, L
Ij' be L
IjPairing standard value.Reach thick synchronously after, further relatively, get again k-1, k three groups of data adjacent with k+1
Go out the L parameter in the optimal judgement moment and carry out demodulation as final output according to these three error mean interpolations then, the demodulating error that calculates can be used for compensating to received signal on the one hand, on the other hand again can be as the synchronous reference of adjusting next time.
In second step (303), every road homophase of process phase place adjustment and quadrature decoder signal merge diversity unit 243 at maximum ratio and carry out the diversity reception processing, and its realization need be considered signal carrier phase and group delay problem.Every road receive path carrier phase difference separately of this device, but the differential ference spiral process is offset these differences; The group delay that travelling carriage arrives each antenna is also different, and changes with moving of user, but because each antenna actual range is nearer, thereby the difference that maximum cluster is delayed compares with symbol width (native system is 5.21 μ s), can ignore.The level of its all signals and noise power need correctly be estimated timely, if its realization will take a large amount of resources in real system, if but the signal power of each passage is is reasonably accepted or rejected, then can realize.Then by the ratio of each road signal voltage with noise power is weighted, and summation.The output signal-to-noise ratio that the method for this merging diversity produces should equal each passage signal to noise ratio sum.
The 3rd step (304) in code element extracting unit 244, was combined the decoding of each sampled point after the diversity, and according to the estimation of the constellation positions in the signal space, finding their eye patterns to open maximum sampled point is sample point.
In the 4th step (305), the code element of extraction generates the bit stream data 2114 to meeting the signaling processing module form through associating soft-decision and bit stream string and conversion processing unit 245.In digital signal processing module 24, realize the parameter of high-speed wideband analog/digital converter 22, programmable digital down-converter module 23 is configured simultaneously, improved the flexibility and the autgmentability of system by control signal 2113.
The invention discloses a kind of wireless base station signal method of reseptance and device based on the baseband digital signal treatment technology, it is compared with the receiving system of conventional wireless base station, has following characteristics:
The first, the Wideband Intermediate Frequency bandpass sampling makes the digital receiverization part more near radio-frequency front-end, and the hardware circuit design of the radio-frequency front-end of whole receiving system is reduced greatly, and signal is reduced greatly through the distortion behind the receive path, and waveform adaptability strengthens.A small amount of hardware equipment such as centre frequency f0 that can pass through at radio-frequency front-end change band pass filter and local vibration source just can reach the frequency range expansion, realize different mobile communication system receiving systems.
The second, programmable digital down-converter module 23 makes high intermediate frequency Signal Processing is had greater flexibility, and digital local oscillator does not exist frequency stability, sideband, phase noise, switching rate etc. to be difficult to the problem that thoroughly solves with respect to the simulation local oscillator; Frequency step, frequency interval etc. also have comparatively ideal performance; The mixing precision mainly is subjected to the width decision etc. of the data bits of digital mixer and digital local oscillator.Realize the choosing and adjusting of digital filter coefficient among the RAM can be realized the different qualities Design of Digital Filter according to different needs by baseband digital signal processing module 24.Characteristics such as its control and modification are easier to also are that analog down converter is incomparable.
The 3rd, in the base band signal process part, various digital demodulations are selected flexibly, are that platform can be realized multiple digital demodulation method with it, and demodulation has phase equilibrium preferably, and demodulation threshold is limited by the signal to noise ratio of input signal mainly.
The 4th, in the base band signal process part, the space diversity method that adopts maximum ratio to merge.The present invention is in the above-mentioned defective that overcomes conventional space diversity device, a kind of high specific merge cells is provided, except the diversity gain of tens of decibels (decide on the decline model) that can obtain to have with respect to channel fading, " only " that can also obtain (when not considering to decline) signal to noise ratio gains.Every road maximum ratio merges, and can obtain the snr gain that maximum reaches 6dB, and gain average out to 3dB in conventional space diversity (selection mode) system.Make the gain of system increase about 3dB.
In a word, apparatus of the present invention are with the receiver channel fully digitalization below the high intermediate frequency.Except obtaining the digital system conventional income superior (such as stable, reliable, convenient and accurate etc.) than analogue system; Also will obtain flexibility that analogue system can't realize, can dynamically adjust performance parameter or the like, the income of the variation of aspects such as adaptation standard, environment and demand.Its most of function all is to be realized by software program, is convenient to the system integration, can be adapted to the receiving system of multiple system mobile communication system through the change to software algorithm.
Claims (10)
1, a kind of signal receiving device is characterized in that, comprising: the radio-frequency front-end processing module (21) of Lian Jieing successively, high-speed wideband analog/digital converter (22), programmable digital down-converter module (23), baseband digital signal processing module (24);
Described radio-frequency front-end processing module (21), utilize antenna to receive wireless signal, be sent to band pass filter (211), after handling through first low noise amplifier (212), frequency mixer (213), if bandpas filter (214), second low noise amplifier (215) successively, output signal is delivered to high-speed wideband analog/digital converter (22);
Described programmable digital down-converter module (23) comprises digital controlled oscillator (231), is used to produce the pair of orthogonal local oscillation signal, delivers to digital multiplier (232), and being used for frequency to be processed in the digital intermediate frequency signal of every road is f
iThe signal in orthogonal digital signal be decomposed into two digital orthogonal baseband signal I and Q, realize data pick-up through cascade integral comb filter (233) again, the data that are extracted are carried out shaping filter through wave digital lowpass filter (234) again, and parallel/serial conversion and the buffering that data fifo buffering area (235) carries out data is sent in its output;
Described baseband digital signal processing module (24) comprises the digital demodulation unit (241) that is linked in sequence, symbol synchronization adjustment unit (242), maximum ratio merge diversity unit (243), code element extracting unit (244), associating soft-decision and bit stream string and conversion processing unit (245).
2, signalling as claimed in claim 1, it is characterized in that, described high-speed wideband analog/digital converter (22) is accepted the output signal from radio-frequency front-end processing module (21), through after the analog/digital conversion, output signal is delivered to described programmable digital down-converter module (23).
3, signalling as claimed in claim 1 is characterized in that, described high-speed wideband analog/digital converter (22) can have been realized the four-way sampling by two AD6600.
4, signalling as claimed in claim 1, it is characterized in that, described cascade integral comb filter (233) has used two-stage cascade, wherein the first order is second order integration pectination (CIC) filter, the second level is five rank integration pectinations (CIC) filters, and it extracts coefficient and can be provided with by baseband digital signal processing module (24).
5, signalling as claimed in claim 1 is characterized in that, described programmable digital down-converter module (23) can comprise the converter unit that many groups are made up of digital controlled oscillator, digital multiplier, cascade integral comb filter and wave digital lowpass filter.
6, signalling as claimed in claim 1, it is characterized in that described baseband digital signal processing module (24) is carried out the parameter setting to cascade integral comb filter (233) wave digital lowpass filter (234) and high-speed wideband analog/digital converter (22) respectively.
7, a kind of digital receive method of realizing the Wideband Intermediate Frequency bandpass sampling comprises the steps:
Step 1 (102): radio frequency analog signal is mixed down high analog intermediate frequency signal;
Step 2 (103): high analog intermediate frequency signal is carried out high-speed wideband A/D sampling;
Step 3 (104): digital intermediate frequency signal is carried out Digital Down Convert handle;
Step 4 (105): the zero intermediate frequency complex signal is carried out a series of Digital Signal Processing.
8, the digital receive method of realization Wideband Intermediate Frequency bandpass sampling as claimed in claim 7 is characterized in that, described step 1 (102) comprises following process:
The upward signal of reception antenna through band pass filter (211) filtering out of band signal, is amplified and frequency mixer (213) mixing by first low noise amplifier (212), and it is f that radiofrequency signal is transformed into centre frequency
0, bandwidth is B
0The Wideband Intermediate Frequency signal; Through intermediate-frequency filter (214) filtering image frequency, include a plurality of channels (number of channel=intermediate-frequency bandwidth/signal bandwidth) in this intermediate-frequency bandwidth again, carried out intermediate frequency by second low noise amplifier (215) at last and be amplified to the signal level that subordinate handles.
9, the digital receive method of realization Wideband Intermediate Frequency bandpass sampling as claimed in claim 7 is characterized in that, described step 3 (104) is carried out the Digital Down Convert processing to digital intermediate frequency signal and comprised following process:
At first, by digital controlled oscillator NCO (231), produce pair of orthogonal local oscillation signal cos (win) and sin (win), frequency to be processed is f in 2N digital multiplier (232) (N is a port number) finished digital intermediate frequency signal
iThe orthogonal digital of signal decompose, every passage produces two-way digital orthogonal baseband signal I and Q;
Then through a cascade integral comb filter (233), realize the extraction of data, the signal that is extracted passes through wave digital lowpass filter (234) again and carries out shaping filter, the exponent number of its realization is controlled by described baseband digital signal processing module (24), and filter coefficient can be stored among the RAM of programming device; Filtered signal enters data fifo buffering area (235) again, and it realizes that Q signal cushions and parallel/serial conversion to multichannel I; Produce the zero intermediate frequency baseband I, the Q digital signal.
10, the digital receive method of realization Wideband Intermediate Frequency bandpass sampling as claimed in claim 7 is characterized in that, described step 4 (105) is carried out a series of Digital Signal Processing to the zero intermediate frequency complex signal and comprised following process:
(I Q) carries out digital demodulation, symbol synchronization adjustment, maximum ratio merging diversity, code element extraction, associating soft-decision and bit stream string and conversion process to the multichannel complex signal respectively; Form is injected into the signaling process part with code stream on request then, finishes the entire process process from the radiofrequency signal to the baseband signal.
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| FI108486B (en) * | 1997-01-31 | 2002-01-31 | Nokia Corp | Method and Circuit Arrangement for Processing Received Signals in a Communication System |
| US6507624B1 (en) * | 1999-04-21 | 2003-01-14 | Tektronix, Inc. | Bandpass sampling architecture for wide-frequency band signal analysis |
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