Trellis coded modulation (TCM) is a well known

scheme that reduces power requirements without any bandwidth

expansion. In TCM, only certain sequences of successive

constellation points are allowed (mapping by set partitioning).

The novel idea in this paper is to apply the TCM concept

to the antenna constellation points of spatial modulation (SM).

The aim is to enhance SM performance in correlated channel

conditions. SM considers the multiple transmit antennas as

additional constellation points and maps a first part of a block

of information bits to the transmit antenna indices. Therefore,

spatial multiplexing gains are retained and spectral efficiency