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Degrees of freedom region of the MIMO X Channel (2007)
| Citations: | 91 - 28 self |
BibTeX
@MISC{Jafar07degreesof,
author = {Syed A. Jafar and et al.},
title = {Degrees of freedom region of the MIMO X Channel},
year = {2007}
}
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Abstract
hop, is especially interesting, as the intermediate hop takes place over an interference channel with single antenna nodes. While the two user interference channel with single antenna nodes has only one degree of freedom by itself, it is able to deliver degrees of freedom when used as an intermediate stage between a antenna source and a antenna destination [5]. The key is an amplify and forward scheme where the relay nodes, instead of trying to decode the messages, simply scale and forward their received signals. [1]–[3] consider end to end channel orthogonalization with distributed sources, relays and destination nodes and determine the capacity scaling behavior with the number of relay nodes. It is shown that distributed orthogonalization can be obtained even with synchronization errors if a minimum amount of coherence at the relays can be sustained. Degrees of freedom for linear interference networks with local side-information are explored in [22] and cognitive message sharing is found to improve the degrees of freedom for certain structured channel matrices. The MIMO MAC and BC channels show that there is no loss in degrees of freedom even if antennas are distributed among users at one end (either transmitters or receivers) making joint signal processing infeasible, as long as joint signal processing is possible at the other end of the communication link. The multiple hop example of [5], described above, shows that there is no loss of degrees of freedom even with distributed antennas at both ends of a communication hop (an interference channel) as long as the distributed antenna stages are only intermediate
Keyphrases
freedom region mimo channel joint signal processing interference channel relay node single antenna node certain structured channel matrix destination node communication hop local side-information antenna destination minimum amount distributed orthogonalization communication link distributed antenna stage multiple hop example user interference channel bc channel antenna source channel orthogonalization intermediate hop mimo mac intermediate stage synchronization error distributed source linear interference network cognitive message sharing
