Symbol Synchronization In The Mimo System Research

Future broadband wireless communication systems should be able toprovide reliable high-data-rate transmissions at low cost in time andfrequency selective wireless channel. Multiple Input Multiple Output(MIMO) technique, one of the most significant breakthroughs inwireless communications field offers an effective way to combat andeven exploit fading. However, timing synchronization plays animportant role in the area of telecommunications. It is developed withthe most material resources and manpower especially for mobiletelecommunication. With mobile telecommunication being updatedconstantly, this trend will be more obvious. The synchronization istypically achieved by altering the frequency of the sampling clock.Another approach is a feedback loop. In this case, a phase error isdetermined from the signal samples and the sampling clock is altereddepending on the obtained error signal.In MIMO system because the signal is composed of several routs ofsignal, it is difficult of extracting the timing information. So theformer timing synchronization algorithms are not suitable for MIMOsystem. In this thesis the author:1)researched a third method, wherethe sampling clock remains independent of the symbol timing. Theentire synchronization process is performed in the digital domain.Timing adjustment is achieved by interpolating among thenonsynchronized samples in such manner as to produce the correctsamples that would occur if the original sampling had beensynchronized to the symbols; 2)researched a timing recovery schemebased on crossing zero point timing error detection and Lagrangeinterpolation; 3)researched a timing recovery scheme based on phaseestimation and Lagrange interpolation. The researches of theseschemes are useful to synchronization in MIMO system.