The challenge that character of interface of 5G millimeter wave analyses reachs consideration element
Time:
Click:77
source:MCGUFFIE CNC Machining
Introduction: For to radio frequency (RF) the millimeter wave frequency of channel undertakes characteristic analysis, the engineer faces a lot of unprecedented new challenges. The article discusses challenge of wh some of which and consideration factor, assist an engineer to meet these difficult problem head-on easily. 5G has a lot of causes that have challenge sex quite -- draw together increases rate of data of peak value of network capacity, promotion and to give way to move communication service to become more reliable. Among them some of target needs to improve nowadays efficiency 10 times, 100 times or 1, 000 times, in having the spectrum under 6GHz, this cannot be being reached. Accordingly, researcher must be in be as high as 100GHz li metric wave (Cm) reach millimeter wave (MmWave) the wireless interface with the new research in frequency. For to radio frequency (RF) the millimeter wave frequency of channel undertakes characteristic analysis, the engineer faces a lot of unprecedented new challenges. The article discusses challenge of wh some of which and consideration factor, assist an engineer to meet these difficult problem head-on easily. For the wireless interface standard with new formulate, researcher must the character that can evaluate RF passageway, ability knows the way that RF signal delivers through channel. Researcher uses a passageway to explore a technology to collect at present " passageway pulse is answered " (CIR) data, so that use algorithm of channel parameter estimation to pick,take channel parameter, will pick again then the data that takes uses at new channel model propose form, if pursue,1 is shown. Channel explores a quantity to measure a system to be able to be divided for all sorts of different types, from arrive simply complex have, end is inspected estimated parameter and calm. When measuring those who support multichannel diameter transmission, change (Time - Varying) when the passageway, the complex pulse that must know embedded time and phasic news is answered. In addition, can fall in similar requirement, use measure a system differently to duplicate or test and verify is measured, it is a major challenge. Graph 1: The model of wireless transmission channel is explore by channel, channel parameter estimation and statistical data place comprise main technique challenge to include: ◇ supports with be more than 500MHz bandwidth and much passageway, undertake below millimeter wave frequency signal generation and analytic ◇ data pick take reach store ◇ desired result and synchronism change estimation of ◇ passageway parameter to discuss next conduce to a few serious considerations that because of answering these challenge. The person that signal generation and analysis are used to satisfy the tall bandwidth demand to 5G, brigadier of wireless interface mark covers the millimeter wave frequency that is as high as 100GHz, bandwidth comes for 500MHz 2GHz, and support many passageways. Here the circumstance falls, researcher needs to consider rife factor, and the channel that earnestly wants tall efficiency explores a system. These measure a system must requirement of core of can contented aforementioned, offer but reduplicative is measured. Important system component includes to be based on generator of weaveform of fundamental frequency random (AWG) converter of broadband number imitate (DAC) , and can regard as the imitate number converter that broadband number converter or oscillograph use (ADC) , require bandwidth in order to support place, have enough support to pick the resolution that takes signal place to need dynamic range. No less, as a result of 5G standard have not formulate, test equipment should have the flexibility that comparative, such ability can ask to reach standard gradual progress as the test, and undertake configuration or configure afresh. Data picks take with store when measuring a system to collect primitive data through the broadband that provides much channel function, only of bandwidth of a 8 passageways, 1GHz measure, can be in short the bad news inside one second uses the data that is as high as several Gigabyte, explode disk drive a place of strategic importance quickly. Not only such, researcher still must pick the data that takes ADC, stock next store device. Want to pick to take and shed means in order to string together to transmit data in real time, it is impossible task at all. What feel exclusively happy is disk drive manufacturer, because they can sell,give more storing device, but this kind of method is unworkable. Additional, still can consider to use two kinds to be able to reduce number to occupy those who collect an amount to pick take a method: If ◇ explores signal little at a deferent cycle, can pick only take available data, or pick only the data that takes place of executive CIR computation to need. This kind of method can reduce place to need collection data bulk considerably. ◇ next, can use built-in real time automatic correlation and signal processing function measure a broadband, so that be in,measure the generation inside the system effective CIR data. Need to store only right now CIR result, can save considerably consequently store space, provide CIR result quickly. Passageway parameter estimation up to now till, most research is finished in only channel. MIMO passageway introduced space and associated idea, derive the main problem of estimation space parameter consequently. For example, researcher needs estimation to reach part (AoA) , give angle of fire (AoD) , and patulous horn (AS) wait for parameter. At present algorithm of estimation of practicable channel parameter includes beam figuration, child space, and the biggest likelihood (Maximum Likelihood, ML) wait for a variety of methods. For consistency, unisonant sex and estimation efficiency, ML estimation algorithm is the estimation algorithm of MIMO passageway parameter with admirable efficiency. Measure inferior SAGE algorithm with operation especially among them (the biggest likelihood is a foundation) most the reception that gets researcher. Desired result and synchronism change desired result and synchronism far more accurate than obtaining, but reduplicative result is more important. By means of uses two rubidium frequency, the 10MHz synchronism that offers precision of stable, height for emitter and receiver is referenced frequency, the synchronism that can realize emitter and receiver subsystem is changed, if pursue,2 are shown. In addition, still must pass through spark, will explore the generation that inspires signal to reach pick take synchronism to change. When building the millimeter wave that composition of a picture shows 2 times to measure a system, must consider the benefit of desired result: ◇ system desired result also is called " carry pair of backs on the back " desired result, can receive emitter receiver repeatedly, with leading reference and systematic frequency to Qi Pin, obtain then accurate amplitude, phasic reach arrive at time estimation. The differential IQ output of AWG of ◇ fundamental frequency may have sequential, gain and orthogonal error, this meeting causes an effect to signal quality. IQ is broken those who match desired result to be able to amend AWG to output is inphase the unbalance between as phasic as orthogonality signal. Converter of number of ◇ much channel, broadband or oscillograph may be between the passageway occurrence time and phasic mutation, will cause an effect to measuring an outcome consequently. You can measure passageway frequency deviation of whole with all sorts of methods, among them a kind of method is to measure each channel to reach phasic difference in the amplitude inside big frequency limits, and apply mechanically broadband amends filter. ◇ antenna and power desired result also must include a consideration. You can examine the desired result data of aerial manufacturer. If was not offerred, can undertake aerial array inside microwave lab phasic field measure, try to compare with the academic efficiency of aerial array. Graph 2: This measures a system to include to be used at the rubidium frequency that accurate Tx and Rx synchronism change, and can pick signal generation and data take maintain pick consistently take trigger epilogue in a word, it is not easy to want to undertake characteristic analysis to interface of new 5G millimeter wave, the meeting in the process confronts a lot of new challenges. The flexible when supporting what multichannel diameter travels for the analysis, must use measure a system complexly, include signal of supportive millimeter wave, broadband and the test facility of many channel among them; Overall desired result; And synchronism changes a function, so that use algorithm of effective channel parameter estimation, undertake true and accurate channel model character is analysed, obtain then accurate and but reduplicative is measured. CNC Milling