A Low-PAPR High-Rate Full-Diversity 4x4 Space-Time Code with Fast Maximum-Likelihood Decoding

From a practical point of view, fast Maximum Likelihood Decoding (MLD) and low Peak-to-Average-Power- Ratio (PAPR) are two important design criteria for Space-Time Block Codes (STBCs). The use of the principle of conditional detection allows for having high-rate STBCs while keeping the complexity of detection at a reasonable level. Recently, we proposed a structure for a STBC with fast MLD having a rate of 3/2 complex symbols per channel use. In this paper, the PAPR criterion is included in the code design, and a modified version is proposed which has a lower PAPR.