Abstract
Optimum combining (OC) in cooperative relaying enables achieving a diversity gain of M in the presence of co-channel interference (CCI), where M is the number of relay nodes. The additional performance overhead of OC is the need for estimation of interferer channels. The impact of imperfect channel estimation on the performance of OC with decode-and-forward relaying is analyzed. When the source-destination and relay-destination channel estimations are imperfect, the diversity gains of OC deteriorate and the performance further degrades with increase of the error variance. When the destination node accurately estimates the variances of the interferer channel state information (CSI), instead of instantaneous CSI, no performance loss is observed. Thus, the overhead associated with the interferer channel estimation in OC can be significantly reduced.
| Original language | English |
|---|---|
| Article number | 6645479 |
| Pages (from-to) | 18-21 |
| Number of pages | 4 |
| Journal | IEEE Wireless Communications Letters |
| Volume | 3 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Feb 2014 |
| Externally published | Yes |
Keywords
- CSI variance
- Channel estimation error
- co-channel interference
- decode-and-forward
- optimum combining
- outage probability