Name
Abstract | ||
|---|---|---|
A new problem formulation is presented for the Gaussian interference channels
(GIFC) with two pairs of users, which are distinguished as primary users and
secondary users, respectively. The primary users employ a pair of encoder and
decoder that were originally designed to satisfy a given error performance
requirement under the assumption that no interference exists from other users.
In the case when the secondary users attempt to access the same medium, we are
interested in the maximum transmission rate (defined as {\em accessible
capacity}) at which secondary users can communicate reliably without affecting
the error performance requirement by the primary users under the constraint
that the primary encoder (not the decoder) is kept unchanged. By modeling the
primary encoder as a generalized trellis code (GTC), we are then able to treat
the secondary link as a finite state channel (FSC). The relation of the
accessible capacity to the capacity region of the GIFC is revealed. Upper and
lower bounds on the accessible capacity are derived. For some special cases,
these bounds can be computed numerically by using the BCJR algorithm. The
numerical results show us, as expected, that primary users with lower
transmission rates may allow higher accessible rates, and that better primary
encoders guarantee not only higher quality of the primary link but also higher
accessible rates of the secondary users. More interestingly, the numerical
results show that the accessible capacity does not always increase with the
transmission power of the secondary transmitter. |
Year | Venue | DocType |
|---|---|---|
2010 | Computing Research Repository | Journal |
Volume | Citations | PageRank |
abs/1012.5 | 0 | 0.34 |
References | Authors | |
15 | 4 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Xiao Ma | 1 | 487 | 64.77 |
| Xiujie Huang | 2 | 28 | 5.53 |
| Lei Lin | 3 | 6 | 2.90 |
| Baoming Bai | 4 | 353 | 63.90 |