  In this paper, we investigate performances of simple transmission strategies.
We first consider two user SISO Gaussian symmetric interference channel (IC)
for which Etkin, Tse and Wang proposed a scheme (ETW scheme) which achieves one
bit gap to the capacity. We compare performance of point-to-point (p2p) codes
with that of the ETW scheme in practical range of transmitter power. It turns
out that p2p coding scheme performs better or as nearly good as the ETW scheme.
Next, we consider K user SISO Gaussian symmetric IC. We define interference
regimes for K user SISO Gaussian symmetric IC and provide closed-form
characterization of the symmetric rate achieved by the p2p scheme and the ETW
scheme. Using this characterization, we evaluate performances of simple
strategies with K=3, and show the similar trend to two user case.
