To meet the future demand for huge traffic volume of wireless data service, the research on the fifth generation (5G) mobile communication systems has been undertaken in recent years. It is expected that the spectral and energy efficiencies in 5G mobile communication systems should be ten-fold higher than the ones in the fourth generation (4G) mobile communication systems. Therefore, it is important to further exploit the potential of spatial multiplexing of multiple antennas. In the last twenty years, multiple-input multiple-output (MIMO) antenna techniques have been considered as the key techniques to increase the capacity of wireless communication systems. When a large-scale antenna array (which is also called massive MIMO) is equipped in a Base-Station, or a large number of distributed antennas (which is also called large-scale distributed MIMO) are deployed, the spectral and energy efficiencies can be further improved by using spatial domain multiple access. This paper provides an overview of massive MIMO and large-scale distributed MIMO systems, including spectral efficiency analysis, channel state information (CSI) acquisition, wireless transmission technology, and resource allocation.
標簽： Large-scale Antenna Systems
上傳時間： 2020-05-27
上傳用戶：shancjb
Nature is seldom kind. One of the most appealing uses for radio- telephone systems—communication with people on the move—must over- come radio transmission problems so difficult they challenge the imagina- tion. A microwave radio signal transmitted between a fixed base station and a moving vehicle in a typical urban environment exhibits extreme variations in both amplitude and apparent frequency.
標簽： Communications Microwave Mobile
上傳時間： 2020-05-28
上傳用戶：shancjb
By definition, the term “mobile-radio communications” describes any radio communication link between two terminals of which one or both are in motion or halted at unspecified locations and of which one may actually be a fixed terminal such as a base station. This definition applies to both mobile-to-mobile and mobile-to-fixed radio communica- tion links. The mobile-to-mobile link could in fact consist of a mobile- to-fixed-to-mobile radio communication link.The term “mobile” applies to land vehicles, ships at sea, aircraft, and communications satellites. In tactical situations, mobile-radio systems may include any or all of these types of mobile terminals.
標簽： Communications Engineering Mobile
上傳時間： 2020-05-30
上傳用戶：shancjb
In a cellular communication system, a service area or a geographical region is divided into a number of cells, and each cell is served by an infrastructure element called the base station through a radio interface. Management of radio interface related resources is a critical design component in cellular communications.
標簽： Management Resource Radio
上傳時間： 2020-06-01
上傳用戶：shancjb
Cadence base 教程
上傳時間： 2013-04-15
上傳用戶：eeworm
HT47R20A-1時基(Time Base)使用介紹 HT47 系列單片機的時基可提供一個周期性超時時間周期以產(chǎn)生規(guī)則性的內(nèi)部中斷。時基的時鐘來源可由掩膜選擇設(shè)定為WDT 時鐘、RTC 時鐘或指令時鐘（系統(tǒng)時鐘/4）；其超時時間范圍可由掩膜選擇設(shè)定為“時鐘來源”/212~“時鐘來源”/215。如果時基發(fā)生超時現(xiàn)象，則其對應(yīng)的中斷請求標志（TBF）會被置位，如果中斷允許，則產(chǎn)生一個中斷服務(wù)到08H 的地址。
上傳時間： 2013-11-15
上傳用戶：13925096126
RC5/RC6 Base加密/解密源碼
上傳時間： 2015-01-03
上傳用戶：miaochun888
Base 64 加解碼程序
上傳時間： 2013-12-16
上傳用戶：zhenyushaw
PowerFish is a class library, intended to provide a broad functionality base for any application. Although the focus is on game and demo development. PowerFish是一個類庫，旨在為應(yīng)用程序提供一個廣泛的功能基礎(chǔ)，雖然其重點是在游戲和演示開發(fā)。
標簽： functionality application PowerFish intended
上傳時間： 2013-11-28
上傳用戶：2467478207
It provides a base of DICT web service ( similar to DICT rfc2229) and create relative applications (server side,client side), they are all SOAP based.
標簽： DICT applications provides relative
上傳時間： 2015-01-12
上傳用戶：alan-ee
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