An improved method to design QPSK Balanced Space-Time Trellis Codes

Abstract

International audienceRecently, a new class of Space-Time Trellis Codes was proposed as having the best performance. These codes are 'balanced' because they use the points of the constellation with the same probability. In this correspondence, we propose a new and simpler method than exisiting method to design these class for QPSK modulation and several transmit antennas. New and better balanced codes for 3 and 4 transmit antennas are also proposed

Improved Balanced 2n-PSK STTCs for Any Number of Transmit Antennas from a New and General Design Method

“…In [10], a simpler method to design balanced 4-PSK STTC was presented. The general method described in this paper which is based on the method of [10] allows an easier design of balanced codes for any number of transmit antennas and for any 2 …”

“…The concept of "balanced codes" has been proposed in [8][9][10]. It is based on the observation that the best STTCs proposed in the literature present the same property: the generated symbols of the MIMO constellation are equally probable.…”

“…This type of code is called [8,10] ℤ and thus a fully balanced space-time trellis code for 4-PSK modulation and 2 transmit antennas is obtained.…”

“…In [8], it has been remarked that the codes achieving the best performance have the same property: the used points of multiple input multiple output (MIMO) constellation are generated with the same probability. Therefore, these codes are referred to as "Balanced space-time trellis codes: B-STTCs" [8][9][10].…”