  The emerging fifth generation (5G) wireless access network, aiming at
providing ubiquitous and high data rate connectivity, is envisaged to deploy
large number of base stations with higher density and smaller sizes, where
inter-cell interference (ICI) becomes a critical problem. Frequency quadrature
amplitude modulation (FQAM) has been shown to reduce the ICI at the cell edge
therefore achieve a higher transmission rate for cell edge users. This paper
investigates the detection of FQAM symbols and noise plus ICI in a multi-cell
FQAM communication network. Turbo-coded bit error rate (BER) and frame error
rate (FER) of multi-cell FQAM are studied. Also, the cumulative distribution
function (CDF) of signal to noise plus interference (SINR) of multi-cell FQAM
is computed using stochastic geometry. It is demonstrated via simulations FQAM
outperforms quadrature amplitude modulation (QAM) in BER and FER when ICI is
significant. Furthermore, FQAM can achieve better SINR than QAM.
