Paper Title
Performance Evaluation of Higher Order Alamouti Schemes with Different Modulation Formats
Abstract
In wireless communication fading of channels is the serious cause of the received degraded signals. Orthogonal
transmitter diversity such as time diversity and frequency diversity is quite simple to implement and, with optimum signal
combining, can take full advantage of fading multipath channels. Receive diversity techniques like maximal ratio receive
combining have been popular means of introducing multiple antennas into communication systems. Alamouti proposed a
scheme, Space-time block codes which introduces transmit diversity with similar complexity and performance as maximal
ratio receive combining. This paper evaluates the performance of Space-time Block Code (STBC), for multiple transmitters
and multiple receiver antennas along with different modulation formats like circular, square and rectangular constellation. In
this paper a systematic method of designing for arbitrary Multiple Input, Single Output (MISO) system and then extended to
MIMO systems with multiple receiving antennas. Maximum likelihood detector was used in the receiver which shows
significant reduction in BER for increased values of Eb/N0.
Index terms - Diversity, Flat fading Rayleigh Channels, ML detector, STBC