|
Title:
|
Lower Bounds on the Capacity of Gaussian Relay Channel |
|
Author:
|
Khojastepour, Mohammad; Sabharwal, Ashutosh; Aazhang, Behnaam
|
|
Type:
|
Conference Paper |
|
Keywords:
|
relay channel; capacity; achievable rate |
|
Citation:
|
M. Khojastepour, A. Sabharwal and B. Aazhang,"Lower Bounds on the Capacity of Gaussian Relay Channel," in Conference on Information Sciences and Systems, |
|
Abstract:
|
It has been shown recently that the overall
throughput of dense wireless networks can increase significantly
when wireless nodes collaborate in transmission
of different packets. In this paper, we focus on a simple
network known as the relay channel, where there is a single
relaying node in the system assisting a sender-receiver pair.
We present a new achievable rate for the case of Gaussian
relay channels, which outperforms the best known schemes
in many cases of interest. The proposed scheme is a
variation of the amplify and forward method, and is
labelled as a scale and forward scheme, signifying that the
relay does not use all its power amplifying the received
signal. By controlling the scaling and time-correlation of
the relay signal, we show that the proposed scheme can
outperform all known schemes for several channel gains,
especially those where the best known methods provide no
improvement over direct transmission. Numerical results
are presented to quantify in which regimes the proposed
scheme is the best known coding scheme for the Gaussian
relay channel. |
|
Date Published:
|
2004-03-01 |
