【正文】 “the life”. The information exchange mainly relies on the puter correspondence, but corresponds takes the transmission method, with the sensing technology, the puter technology fuses mutually, has bee in the 21st century the international society and the world economic development powerful engine. In order to of adapt the time request, the new generation of mobile munication technology seasonable and lives, the new generation of mobile munication technology is the people said that third generation39。s, gains the multimedia munication services. Along with the time progress, the technical innovation, people39。s enhancement, the mobile munication technology renewal speed is quite astonishing, almost every other ten year mobile munication technology has a transformation update, from the 1980s “the mobile phone” to present39。s union, nimbly OFDM and TDMA, FDMA, CDMA, SDMA bines the multiple access technique. In the 1960s the OFDM multichannel data transmission has succeeded uses in Kineplex and the Kathryn high frequency military channels. OFDM has used in Mbit/s high bit rate digital subscriber line (HDSL), 6 Mbit/s asymmetrical digital subscriber line (ADSL), 100 Mbit/s really high speed figure subscriber39。s another request is under the wide noise bandwidth, must demodulate the signaltonoise ratio to reduce as far as possible, thus increases the cover area. May adopt the antifading the full start power control and the pilot frequency auxiliary fast track demodulation technology, like the frequency range antifading39。s opposite angle BLAST (DBLAST) capacity increase to receive and dispatch the bilateral smallest antenna number in administrative levels the function. The cross time domain which and the air zone expansion signal constitutes using MIMO may also resist the multidiameter disturbance. VBLAST system when indoor 24~34 dB, the frequency spectrum use factor is 20~40 bit/s/Hz. But launches and the receiving end uses 16 antennas, when 30 dB, the frequency spectrum use factor increases to 60~70 bit/s/Hz. The smart antenna automatic tracking needs the signal and the autoadapted free time processing algorithm, produces the dimensional orientation wave beam using the antenna array, causes the main wave beam alignment subscriber signal direction of arrival through the digital signal processing technology, the side lobe or zero falls the alignment unwanted signal direction of arrival. The autoadapted array antennas (AAA, Adaptive Array Antennas) disturb the counterbalance balancer (ICE, Interference Canceling Equalizer) to be possible to reduce disturbs and cuts the emissive power. 3) Software radio technology The software radio technology is in the hardware platform through the software edition by a terminal implementation different system in many kinds of munication services. It uses the digital signal processing language description telemunication part, downloads the digital signal processing hardware by the software routine (DSPH, Digital Signal Pocessing Hardware). By has the general opening wireless structure (OWA, Open Wireless Architecture), patible many kinds of patterns between many kinds of technical standards seamless cut. UWB is also called the pulse to be radio, the modulation uses the pulse width in the nanosecond level fast rise and the drop pulse, the pulse cover frequency spectrum from the concurrent to the lucky hertz, does not need in the radio frequency which the convention narrow band frequency modulation needs to transform, after pulse formation, may deliver directly to the antenna launch. 4) Software radio technology The software radio technology is in the hardware platform through the software edition by a terminal implementation different system in many kinds of munication services. It uses the digital signal processing language description telemunication part, downloads the digital signal processing hardware by the software routine (DSPH, Digital Signal Pocessing Hardware). By has the general opening wireless structure (OWA, Open Wireless Architecture), patible many kinds of patterns between many kinds of technical standards seamless cut. 5) Network security and QoS QoS divides into wireless and the wired side two parts, wireless side39。s QoS involves based on the IP diffSer discrimination service and the RSVP endtoend resources reservation mechanism. Mechanism maps the wireless side IP diffSer IP the QoS. Network security including work turning on security, core work security, application security, safety mechanism visibility and configurable. In the above modern mobile munication key technologies39。s daily life, for this reason, we needed to care that its trend of development, hoped it developed toward more and more convenient people39。s direction, will let now us have a look at the modern mobile munication the future trend of development. 2 Modern mobile munication technological development seven new tendencies First, mobility management already from terminal management to individual management and intelligent management development Second, work already from synchronized digital circuit to asynchronous digital grouping and asynchronous transfer mode (ATM) development。s developments actuated from the algorithm to the procedureoriented and face the goal tendency development。 Five, wireless frequency spectrum processing already from narrow band simulation to the narrow band CDMA development。 The seven, semiconductor devices have developed from each chip 16,000,000,000,000 /150MHz speed VLSI to /350MHz speed VLSI and 2,000,000,000,000,000 /550MHz speed VLSI. Under this tendency39。s development is progresses by leaps and bounds, presents the following several general trends: 1) work service digitization, grouping。 3) Networking intellectualization。 5) More effective use frequenc