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| Multiple Input Multiple Output (MIMO) model |
| Author mimo Views 1 Posted at 2009/3/23 00:13 [View In Forum] |
| The objective of this research is to apply an existing Multiple Input Multipleg Output (MIMO) model [11，32 and 33] to twisted-pair transmission systemsg incorporating measured crosstalk data, and document the resulting capacity relative to theg capacity predicted by current Single Input Single Output (SISO) models for otherwiseg identical transmission systems. In this process, we analyze how the MIMO modelg removes correlated out-of-domain crosstalk, calculate the correlation of the measuredg crosstalk data, and define the link between crosstalk correlation and the performanceg gains due to MIMO processing. We limit our analysis to Near-end Crosstalk (NEXT)g limited systems and only superficially address the performance boost the MIMOg processing can provide through in-domain Far-end Crosstalk (h"EXT) cancellation. 'Theg focus of this research is on establishing capacity limits using a detailed system model andg accurate definitions of input parameters to that model (such as crosstalk correlation), notg on discussing the method of implementation and the achievable performance of thoseg implementations.g The primary difference between the MIMO and SISO models discussed hereing lies in the fact that the MIMO system has the ability to treat multiple transmit lines as ag unit with some type of central control at the transmitter and receiver. The SISO modelg treats each twisted-pair separately and has no knowledge of other twisted-pair channels ing a binder. A.s a result, the SISO system has knowledge of the transmit signal on its singleg transmit channel, the transfer function of the twisted-pair channel over which it isg transmitting and the total noise on that channel. On the other hand, the central controlg unit in the MIMO system has full knowledge of all transmit signals in its domain, theg transfer functions of all in-domain (or system) channels, the crosstalk-coupling functionsg between all in-domain channels and the total noise on each in-domain channel. |
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