MIMO techniques for improved 3G cellular network performance



The Multiple-Input Multiple-Output (MIMO) techniques are widely proposed as the key technique to enhance the radio channel capacity of cellular systems. This technology can enhance the SINR and/or improve the code efficiency by enabling multi-stream transmission. To fully utilize these potential features, MIMO technology should be combined with flexible link adaptation (LA) mechanisms which can map high SINR values into high user data rates. That is why it is natural for people to think of the possibility of introducing MIMO together with the High Speed Downlink Packet Access (HSDPA). HSDPA is a new feature that is proposed in the Release 5 specifications of the 3GPP WCDMA/UTRA-FDD standard. Many practical MIMO schemes for HSDPA have been proposed and evaluated. The list includes STTD, DSTTD, Close Loop Mode1 and Mode2, and PARC, etc. The target of this study is to evaluate the performance of those proposed MIMO schemes. In order to do that, more comprehensive studies will be done in both link and system level, in which the more realistic MIMO channel model will be used and imperfections in Tx/Rx will be considered. The effect of different Link Adaptation (LA) and Hybrid Automatic Repeat reQuest (H-ARQ) algorithms will be included in the next step. (Na Wei, Troels B. Sørensen, Preben E. Mogensen; Troels E. Kolding, Nokia)
Effektiv start/slut dato31/12/200331/12/2003


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