CN101719773A - Signal processing method and system for ultra wideband zero-intermediate frequency receiver - Google Patents
Signal processing method and system for ultra wideband zero-intermediate frequency receiver Download PDFInfo
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Abstract
The invention provides a signal processing method and system for an ultra wideband zero-intermediate frequency receiver. The method comprises the following steps of: encoding a signal sent by a signal source, wherein the quantity difference between codes 1 and 0 is not greater than 2 during encoding; performing emission pretreatment on the signal, and sending the signal to the receiver; performing receiving pretreatment on the signal, and decoding the signal after receiving pretreatment. The invention eliminates a zero-power spectrum component of a single carrier wave, avoids the cross-symbol interference caused by a high-pass wave filter, and also ensures that the energy consumption of an emitting end is not increased.
Description
Technical field
The present invention relates to ultra-wideband communication technical field, particularly relate to a kind of signal processing method and system that is used for ultra wideband zero-intermediate frequency receiver.
Background technology
Super-broadband tech is a kind of novel radio technology of at present the most competitive short distance high spatial capacity (traffic/square metre), be expected at wireless lan (wlan), wireless personal local area network (WPAN),, a lot of fields such as wireless sensor network, intelligent multimedia home network, safety and military affairs all have broad application prospects.Radio ultra wide band system can realize that frequency band is shared, and research thinks that this technology can be worked simultaneously with other narrowband systems.Ultra-wideband Communication Technology is a kind of unconventional, novel Radio Transmission Technology, its usually adopt extremely wide frequency spectrum (relative bandwidth greater than 20% or absolute bandwidth greater than 500MHz) transmission information.
General wireless communication receiver system adopts the two conversion regimes of intermediate frequency, and it has good image cancellation performance.Yet superheterodyne tuner wherein needs complicated two-stage type mixing: earlier signal is reduced to high intermediate frequency from radio-frequency range, by the second level mixting circuit signal is reduced to base band again.
The receiver of zero intermediate frequency mode only needs a mixing just radiofrequency signal directly can be reduced to base band from radio-frequency range.This receiver does not have the problem that mirror image disturbs.But, ultra wideband zero-intermediate frequency receiver also has its shortcoming: because the 1/f noise of zero intermediate frequency down-conversion mode can overlap with the complex baseband signal frequency spectrum, the closer to signal baseband zero-frequency (direct current) point, this noise is just strong more, so the 1/f mixer noiser can cause the signal to noise ratio of the baseband signal of receiver to decline to a great extent.This problem is especially serious for the integrated circuit (IC) design of CMOS technology, therefore need adopt high pass filter to come this 1/f frequency mixer low-frequency noise of filtering in the base-band analog signal loop.Stride symbol-interference (ISI, inter-symbol interference) but do the wave form varies that can cause signal like this and produce, thereby make the bit error rate performance of transmission signals reduce significantly.
Mb-ofdm (MB-OFDM, Multiband Orthogonal FrequencyDivision Multiplexing) technology adopts the OFDM technology, the mode of leaving a blank by subcarrier is so that solve the ISI that produces because add high pass filter in the signal path.(mode of (IFFT, Inverse Fast Fourier Transformer) can be divided into some very narrow parallel subcarriers to broadband signal and communicate because OFDM is by adopting inverse fast fourier transform at transmitting terminal.So can just leave a blank the subcarrier of those low frequencies out not as the signal transmission at the frequency domain of transmitting terminal, when adopting high pass filter, will can not produce any influence like this to its low frequency baseband signal (empty invalid subcarrier).
The shortcoming of MB-OFDM ultra broadband standard is the hardware configuration complexity of OFDM, and it is also high to consume energy.Is very a plurality of subcarriers (being made as n) because signal isolates, when the symbol of all sub-carrier signals was all identical, the amplitude of total signal just be original n times.With regard to having the amplitude stack problem of signal, be referred to as peak-to-average power ratio problem (PAPR, Peak-to-Average Power Ratio) like this.The PAPR problem makes the emission power consumption increase by ten several times.
In a word, need the urgent technical problem that solves of those skilled in the art to be exactly: how can solve the ISI interference problem of ultra wideband zero-intermediate frequency receiver system, guarantee not increase the power consumption of transmitting terminal simultaneously.
Summary of the invention
Technical problem to be solved by this invention provides a kind of baseband coding method and system that is used for ultra wideband zero-intermediate frequency receiver, by eliminating the power spectrum component at zero point of single carrier, the ISI that avoids high pass filter to cause disturbs, and guarantees not increase the power consumption of transmitting terminal simultaneously.
In order to address the above problem, the invention discloses a kind of signal processing method that is used for ultra wideband zero-intermediate frequency receiver, comprising:
The signal that information source is sent is encoded; The described difference that is encoded to the number of " 1 " and " 0 " in the code word is not more than 2 coding;
Signal is launched preliminary treatment and sent it to receiver;
Signal is received preliminary treatment and the pretreated signal of decoding reception.
In a preferred embodiment of the invention, described coding comprises: 5B6B coding, 8B10B coding or 10B12B coding.
Concrete, when carrying out the 5B6B coding,, the signal that information source is sent is encoded according to the control of the positive and negative mode switch of code word; Wherein, described holotype comprises: the coding that comprises four " 1 " and two " 0 " in the code word; Described negative mode comprises: the coding that comprises four " 0 " and two " 1 " in the code word; Comprise the balanced code that is of three " 1 " and three " 0 " in the code word, its pattern is identical with the pattern of its last code word.
Further, when carrying out the 8B10B coding, described code word comprises: the code word that the number of 252 " 1 " equates with the number of " 0 "; And the difference of the number of the number of 8 " 1 " and " 0 " is 2 code word.
Further, described emission preliminary treatment comprises: with signal by baseband-converted to radio band; Described reception preliminary treatment comprises: signal is transformed into base band by radio band.
Further, described reception preliminary treatment also comprises: filter 1/f noise by high pass filter.
In addition, the invention also discloses a kind of signal processing system that is used for ultra wideband zero-intermediate frequency receiver, comprising:
Transmitter is used for signal is launched preliminary treatment, and signal is sent to receiver by baseband-converted after radio band;
Receiver, the signal that is used for receiving is transformed into base band by radio band and receives preliminary treatment;
Wherein, described transmitter comprises:
Coding unit, the signal that is used for before the emission preliminary treatment information source being sent is encoded; The described difference that is encoded to the number of " 1 " and " 0 " in the code word is not more than 2 coding;
Described receiver comprises:
Decoding unit is used for decoding and receives pretreated signal.
Preferably, described coding comprises: 5B6B coding, 8B10B coding or 10B12B coding.
Further, when described coding unit carries out the 5B6B coding,, the signal that information source is sent is encoded according to the control of the positive and negative mode switch of code word; Wherein, described holotype comprises: the coding that comprises four " 1 " and two " 0 " in the code word; Described negative mode comprises: the coding that comprises four " 0 " and two " 1 " in the code word; Comprise the balanced code that is of three " 1 " and three " 0 " in the code word, its pattern is identical with the pattern of its last code word.
Further, when described coding unit carried out the 8B10B coding, described code word comprised: the code word that the number of 252 " 1 " equates with the number of " 0 "; And the difference of the number of the number of 8 " 1 " and " 0 " is 2 code word.
Compared with prior art, the present invention has the following advantages:
The present invention is by carrying out 5B6B coding or 8B10B coding to transmission signals, make the probability that occurs " 1 " and " 0 " in the code word reach balance, can guarantee to comprise less low frequency component in the frequency spectrum of transmission pattern, do not contain the flip-flop amount.On signal receiver, disturb by a high-pass filtering filtering 1/f noise, because signal does not have power spectrum component near the zero point of frequency domain,, guaranteed the bit error rate performance of transmission signals so can not cause the additional ISI of receiving terminal to disturb.
In addition,, do not have the problem of peak-to-average force ratio, significantly reduced the radio frequency part power consumption of radio communication, need not bigger back-off, reduced power consumption, be particularly suitable for battery powered hand-held super broad band radio communication equipment than the OFDM mode.
Description of drawings
Fig. 1 is a kind of flow chart that is used for the signal processing method embodiment of ultra wideband zero-intermediate frequency receiver of invention;
Fig. 2 is the positive and negative mode switch schematic diagram of 5B6B coding among the inventive method embodiment;
Fig. 3 is a kind of structure chart that is used for the signal processing system embodiment of ultra wideband zero-intermediate frequency receiver of invention.
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, show a kind of flow chart that is used for the signal processing method embodiment of ultra wideband zero-intermediate frequency receiver of the present invention, comprising:
Signal processing in the embodiment of the invention mainly is used in the situation that ultra wideband transmissions or communication channel bandwidth surpass 10MHz.At first, need encode to the signal that will send, described signal is the baseband signal that information source is sent, and the baseband signal coded system is the comparatively balanced coding of number of " 1 " and " 0 ", and the difference of generally choosing the number of " 1 " and " 0 " in the code word is not more than 2 coding.
In a preferred embodiment of the invention, described coding comprises: 5B6B coding, 8B10B coding or 10B12B coding.
Present embodiment is encoded to example with 5B6B and is specifically described.As shown in table 1, for being used for the 5B6B coding that the ultra broadband zero intermediate frequency signals is handled.
Table 1
In the 5B6B coding, per 5 bit symbols are divided into one group in the signal code stream, and then this 5 bit code is transformed to 6 bit codes.According to the theory of mathematics permutation and combination as can be known, by 5 and 6 bit codes that " 0 ", " 1 " these two kinds of binary signals are formed, following arrangement is arranged: the number of permutations of 5 bit codes has 2
5=32 kinds, the number of permutations of 6 bit codes has 2
6=64 kinds.
In 64 kinds of possible output code words, the balance code word that contains three " 1 " and three " 0 " has 20.So-called balanced code is meant that in a code word number of " 0 " and " 1 " equates.Obviously, such sign indicating number type helps keeping the stability of DC component in the signal bit stream.
In addition, in the non-equilibrium code word, contain have 15 kinds of four " 1 " and two " 0 ", contain have 15 of four " 0 ", two " 1 ", totally 30.If we regard " 1 " to " 0 " as, the addition of 20 kinds of aforementioned balanced codes numeral and be zero then, and remaining 12 kinds be numeral and " 2 " and 12 kinds of numerals and be the Codeword Sets of "+2 ".Generally, for non-equilibrium sign indicating number, only select for use wherein 12 groups to be used for coding.
Except that above-mentioned two kinds of code words, also have 14 groups, the number great disparity of its " 0 " and " 1 " is too big, be unfavorable for stablizing the DC component in the code stream, therefore, the number of " 0 " or " 1 " is 1,5 or 6 o'clock in the code word, not signal coding form is to keep the stable of signal bit stream component.In addition, in 64 code words of 5B6B, there are 20 code words not use.Like this, in a single day receiver receives any one in these 20 code words, must be to have occurred error code in transmission, with work system is carried out Error detection.
From top analysis as can be seen code word select principle for use: at first choose 20 balance code words that contain three " 0 " and " 1 " the code word.Select 24 in 30 non-equilibrium code words that contain four " 0 " or four " 1 " again.
Further, when carrying out the 5B6B coding,, the signal that information source is sent is encoded according to the control of the positive and negative mode switch of code word.Wherein, described holotype comprises: the coding that comprises four " 1 " and two " 0 " in the code word; Described negative mode comprises: the coding that comprises four " 0 " and two " 1 " in the code word.When the number of " 1 " and " 0 " equates in the code word, keep present mode constant, both can be holotype, also can be negative mode simultaneously.
By Fourier transform as can be known:
Wherein, F (Ω) obtains frequency spectrum for signal by discrete Fourier transform; Ω=2 π f/f
sIt is normalized frequency; X[n] be the output valve of discrete source signal (value is+1 when being encoded to " 1 ", and value is " 1 " during for " 0 ").
As seen F (0) depend on x (n) numeral and, if keep numeral and be 0, then the numerical value of F (0) is 0.And the coding thinking of 5B6B is to make numeral and be 0.Then, if in the transmission pattern duration of positive level and negative level equate, just can guarantee not contain flip-flop in the frequency spectrum of transmission pattern, and assurance comprises less low frequency component; Wherein, " 1 " is positive level, and " 0 " is negative level.In the embodiment of the invention, holotype, negative mode are used alternatingly, thereby the total probability that has kept " 0 " in the letter code stream, " 1 " to occur equates.
After the signal encoding, launch preliminary treatment, it comprises: carry out the modulation (digital signal is converted to mode signal) of normal chnnel coding and signal, as single carrier two-phase PSK (BPSK, BinaryPhase Shift Keying) modulation or the like.Carry out the RF up-converter of transmitting terminal then, with signal from the baseband-converted to the radio band, in communication, because baseband signal has the very low spectrum component of frequency, consider for anti-interference and raising transfer rate, general direct transmission need be transformed into the signal that its frequency band is adapted at transmitting in the channel to baseband signal, and the part baseband signal changes radiofrequency signal into.Signal is through after the multipath channel of ultra broadband, and the amplification of carrying out radio frequency at receiver receives.
At receiver, adopt zero intermediate frequency down-conversion mode that radiofrequency signal is transformed to baseband signal, need a mixing that radiofrequency signal is directly reduced to base band from radio-frequency range, realize that zero intermediate frequency receives.In addition, for the filtering 1/f noise, adopted high pass filter to come filtering 1/f low-frequency noise.Because the signal behind the coding in the embodiment of the invention does not have the power spectrum frequency domain component at zero point, so do not eliminated the influence of the high pass filter of 1/f noise, reduced the ISI that causes thus and disturbed, improved the transmission performance of sign indicating number type, reduced the error rate.
Further, because this baseband signal is analog signal at this moment, after through analog to digital converter (ADC, Analog to Digital Converter) sampling, become digital signal.Afterwards, carry out the conventional channel equalization and the processing of channel-decoding, carry out symbol judgement at last, judgement finishes and obtains binary bit-level symbol " 1 " or " 0 ".At this moment, do corresponding 5B6B decoding or 8B10B decoding, perhaps, decode accordingly by the coding of other form according to the coding of transmitting terminal.In the embodiment of the invention, the reduction of data of using the mode of binary coding mapping to carry out transmitting terminal according to table 1 obtains the source signal that transmitting terminal sends.
Need to prove that in embodiments of the present invention, traditional filtering manufacturing process still can be implemented during the ultra broadband zero intermediate frequency signals was handled, so that reduce the signal frequency-domain secondary lobe, lowered the phase mutual interference to signal in the adjacent channel.Therefore can limit Nyquist (Nyquist) filtering of the no ISI of band to be shaped at receiving terminal and transmitting terminal, this sample baseband coding mode will be seldom to the change of traditional communication system, helps design of communication system.
As shown in Figure 2, the positive and negative mode switch schematic diagram of encoding for 5B6B in the embodiment of the invention.In the baseband coding of making a start, the method that adopts the state machine transitions of following positive negative mode to switch is switched positive and negative pattern code character, keeps positive and negative numeral and equates with the data that guarantee transmitting terminal.The frequency domain of transmit signal power spectrum will be guaranteed not have ISI and disturb by zero setting zero point after the high pass filter of receiving terminal like this.
Below, the embodiment that provides one group of 5B6B coding is specifically described,
By the baseband signal of sending be:
01010?01001?01011?01101?01111?01110......
According to shown in the table 1, its corresponding sequence number is 10,9,11,13,15,14
Accordingly, carrying out 5B6B coding back signal bit stream is:
010111?010101?011000?011110?110100?010001......
Its corresponding mode switch is:
Holotype, holotype, negative mode, holotype, holotype, negative mode.
Below, above-mentioned coding is specifically described:
Initial 5B sign indicating number be " 01010 ", and embodiment of the invention regulation is initially holotype, carries out numeral and is the coding of "+2 ", and the 6B sign indicating number is " 010111 ";
Second 5B sign indicating number is " 01001 ", and its positive and negative pattern-coding is identical, for " 010101 " (numeral and be " 0 "), still is in holotype, at this moment, and total digital of preceding two code words and be "+2 ";
The 3rd 5B sign indicating number is " 01011 ", then switches under the negative mode, is encoded to " 011000 " (numeral and for " 2 "), at this moment, and the numeral that first three code word is total and revert to zero;
The 4th 5B sign indicating number is " 01101 ", then switches under the holotype, is encoded to " 011110 " (numeral and for "+2 "), at this moment, and the numeral that preceding four code words are total and be "+2 ";
The 5th 5B sign indicating number is " 01111 ", and its positive and negative pattern-coding is identical, for " 110100 " (numeral and be " 0 "), still is in holotype, at this moment, and total digital of the first five code word and be "+2 ";
The 6th 5B sign indicating number is " 01110 ", then switches under the negative mode, is encoded to " 010001 " (numeral and for " 2 "), at this moment, and the numeral that the first six code word is total and revert to zero.
Coding afterwards by the continuous switching between positive negative mode, guarantees that the numeral of signal encoding code word and positive number, negative equate that the frequency domain of transmit signal power spectrum zero point will be by zero setting so by that analogy.
Further, when the 5B6B of receiver decoding, because the judgement of holotype and negative mode can not be done in the code word of positive negative mode and unique mapping of original source binary data, the 6B code word of positive negative mode all completely corresponds to corresponding unique original source binary data.
Promptly be decoded as 01,001 01,010 01,011 01,101 01110 accordingly.
The balanced coding method (as 10B12B etc.) that is appreciated that other " 1 " and " 0 " is similar with 5B6B, only need be according to source signal, and keep the number of " 1 " in each code word behind the coding to equate with the number of " 0 ".With 8B10B is example, its code word that can select is " 1010101010 ", " 1101010100 ", " 1100101010 ", " 1011010100 ", " 1010110100 ", " 1010110010 " etc., and the number of the number of " 1 ", " 0 " is that 5 coding form has C in the code word
5 10Kind, promptly 252 kinds, provide no longer one by one herein.Need to prove,, shine upon mutually with the 8B coding that the difference that also needs to choose the number of " 1 " and " 0 " is the code word that 8 code words of 2 are formed 4 groups of positive negative modes, and is corresponding with 4 code words of 8B in order to make the 10B coding because the form of 8B coding has 256 kinds.In coding, there are enough coding forms available, only need to guarantee that 1 and 0 number equates to get final product.General, in order to guarantee not contain DC component, when coding, avoid occurring long " 1 " and long connect " 0 " of connecting usually as far as possible.
This sign indicating number type of the 5B6B that adopts by the above embodiment of the present invention (or 8B10 etc.) removes the component of signal zero power spectrum, can conveniently be used for the 1/f noise filtering of ultra broadband zero intermediate frequency mode.After having used high communication number filter filtering 1/f noise, the power spectrum envelope of signal does not change, and disturbs generation so cause not having ISI.This makes the single-carrier modulated of low PAPR be applied in the ultra broadband zero intermediate frequency system becomes possibility.Can improve the power efficiency of super broad band radio communication system and the problem of complexity greatly.In addition,, significantly reduced the radio frequency part power consumption of radio communication, need not the back-off of 10dB, reduced power consumption than the OFDM mode.
At transmitting terminal, the coding of 5B6B (or 8B10 etc.) places before chnnel coding and the modulation, and at receiving terminal, the coding of 5B6B (or 8B10 etc.) places after the symbol judgement of channel-decoding, so very little to the change of wireless communication system, can be conveniently used in the super broad band radio communication system.
Show a kind of structure chart that is used for the signal processing system embodiment of ultra wideband zero-intermediate frequency receiver of the present invention with reference to Fig. 3, comprising:
Wherein, described transmitter 31 comprises:
Described receiver 32 comprises:
Decoding unit 321 is used for decoding and receives pretreated signal.
In a preferred embodiment of the invention, described coding comprises: 5B6B coding, 8B10B coding or 10B12B coding.
Preferably, when described coding unit carries out the 5B6B coding,, the signal that information source is sent is encoded according to the control of the positive and negative mode switch of code word; Wherein, described holotype comprises: the coding that comprises four " 1 " and two " 0 " in the code word; Described negative mode comprises: comprise the coding of four " 0 " and two " 1 " in the code word, comprise the balanced code that is of three " 1 " and three " 0 " in the code word, its pattern is identical with the pattern of its last code word.
Preferably, when described coding unit carried out the 8B10B coding, described code word comprised:
The code word that the number of 252 " 1 " equates with the number of " 0 "; And the difference of the number of the number of 8 " 1 " and " 0 " is 2 code word.
Coding unit by the embodiment of the invention, balanced ratio by " 1 " and " 0 " sign indicating number, make that the duration of positive level and negative level equates in the transmission pattern, can guarantee not contain flip-flop in the frequency spectrum of transmission pattern, and comprise less low frequency component.
Further, on receiver, filter 1/f noise by high pass filter.Because the signal behind the coding in the embodiment of the invention does not have the power spectrum frequency domain component at zero point, so when adopting high pass filter to eliminate 1/f noise, the wave form varies of its signal is less, has reduced the ISI that causes thus and has disturbed, and has improved the transmission performance of sign indicating number type.In addition, the decoding unit of receiver is done corresponding 5B6B decoding, 8B10B decoding or other decodings according to the coding of transmitter, reduces according to the mode of binary coding mapping and obtains the source signal that transmitter sends.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For system embodiment, because it is similar substantially to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
More than to a kind of signal processing method and system that is used for ultra wideband zero-intermediate frequency receiver provided by the present invention, be 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 (10)
1. a signal processing method that is used for ultra wideband zero-intermediate frequency receiver is characterized in that, comprising:
The signal that information source is sent is encoded; The described difference that is encoded to the number of " 1 " and " 0 " in the code word is not more than 2 coding;
Signal is launched preliminary treatment and sent it to receiver;
Signal is received preliminary treatment and the pretreated signal of decoding reception.
2. the method for claim 1 is characterized in that,
Described coding comprises: 5B6B coding, 8B10B coding or 10B12B coding.
3. method as claimed in claim 2 is characterized in that, when carrying out the 5B6B coding,
According to the control of the positive and negative mode switch of code word, the signal that information source is sent is encoded;
Wherein, described holotype comprises: the coding that comprises four " 1 " and two " 0 " in the code word; Described negative mode comprises: the coding that comprises four " 0 " and two " 1 " in the code word; Comprise the balanced code that is of three " 1 " and three " 0 " in the code word, its pattern is identical with the pattern of its last code word.
4. method as claimed in claim 2 is characterized in that, when carrying out the 8B10B coding, described code word comprises:
The code word that the number of 252 " 1 " equates with the number of " 0 ";
And the difference of the number of the number of 8 " 1 " and " 0 " is 2 code word.
5. the method for claim 1 is characterized in that,
Described emission preliminary treatment comprises: with signal by baseband-converted to radio band;
Described reception preliminary treatment comprises: signal is transformed into base band by radio band.
6. the method for claim 1 is characterized in that,
Described reception preliminary treatment also comprises: filter 1/f noise by high pass filter.
7. a signal processing system that is used for ultra wideband zero-intermediate frequency receiver is characterized in that, comprising:
Transmitter is used for signal is launched preliminary treatment, and signal is sent to receiver by baseband-converted after radio band;
Receiver, the signal that is used for receiving is transformed into base band by radio band and receives preliminary treatment;
Wherein, described transmitter comprises:
Coding unit, the signal that is used for before the emission preliminary treatment information source being sent is encoded; The described difference that is encoded to the number of " 1 " and " 0 " in the code word is not more than 2 coding;
Described receiver comprises:
Decoding unit is used for decoding and receives pretreated signal.
8. system as claimed in claim 7 is characterized in that,
Described coding comprises: 5B6B coding, 8B10B coding or 10B12B coding.
9. system as claimed in claim 8 is characterized in that, when described coding unit carries out the 5B6B coding,
According to the control of the positive and negative mode switch of code word, the signal that information source is sent is encoded;
Wherein, described holotype comprises: the coding that comprises four " 1 " and two " 0 " in the code word; Described negative mode comprises: the coding that comprises four " 0 " and two " 1 " in the code word; Comprise the balanced code that is of three " 1 " and three " 0 " in the code word, its pattern is identical with the pattern of its last code word.
10. system as claimed in claim 8 is characterized in that, when described coding unit carried out the 8B10B coding, described code word comprised:
The code word that the number of 252 " 1 " equates with the number of " 0 ";
And the difference of the number of the number of 8 " 1 " and " 0 " is 2 code word.
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| CN102891699A (en) * | 2012-10-22 | 2013-01-23 | 上海集成电路研发中心有限公司 | Ultra-wide band radio frequency transceiver |
| CN107493156A (en) * | 2016-11-24 | 2017-12-19 | 天地融科技股份有限公司 | Configured transmission acquisition methods and terminal |
| CN109818635A (en) * | 2019-01-30 | 2019-05-28 | 北京智芯微电子科技有限公司 | A kind of method for transmitting signals based on zero intermediate frequency reciver |
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| JP3548162B2 (en) * | 2002-02-15 | 2004-07-28 | 松下電器産業株式会社 | Transmission device |
| US7183797B2 (en) * | 2004-10-29 | 2007-02-27 | Altera Corporation | Next generation 8B10B architecture |
| CN101605112B (en) * | 2009-07-15 | 2012-03-28 | 华南理工大学 | Ultra wide band chaotic communication method |
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| CN102891699A (en) * | 2012-10-22 | 2013-01-23 | 上海集成电路研发中心有限公司 | Ultra-wide band radio frequency transceiver |
| CN102891699B (en) * | 2012-10-22 | 2016-09-28 | 上海集成电路研发中心有限公司 | A kind of ultra-wide band radio frequency transceiver |
| CN107493156A (en) * | 2016-11-24 | 2017-12-19 | 天地融科技股份有限公司 | Configured transmission acquisition methods and terminal |
| CN107493156B (en) * | 2016-11-24 | 2020-04-10 | 天地融科技股份有限公司 | Transmission parameter acquisition method and terminal |
| CN109818635A (en) * | 2019-01-30 | 2019-05-28 | 北京智芯微电子科技有限公司 | A kind of method for transmitting signals based on zero intermediate frequency reciver |
| WO2024016870A1 (en) * | 2022-07-18 | 2024-01-25 | 苏州旭创科技有限公司 | Signal processing method, device, and system |
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| CN101719773B (en) | 2013-05-22 |
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