文档介绍：Space-Time Code Design in OFDM Systems
Ben Lu and Xiaodong Wang
Department of Electrical Engineering
Texas A&M University, College Station, TX 77843
E-mail: {benlu, wangx}***@
Abstract- We consider a space-time coded (STC) or- the pairwise error probability (PEP) of the considered
thogonal frequency-division multiplexing (OFDM) sys- STC-OFDM system is analyzed. In Section II-C, the
tem in frequency-selective fading channels. By analyz-
ing the pairwise error probability (PEP), we show that STC coding design principles are proposed. In Section
STC-OFDM systems can potentially provide a diversity II-D, following the proposed coding design principles, a
order as the product of the number of transmitter anten- new class of STC’S is constructed for OFDM systems.
nas, the number of receiver antennas and the frequency
In Section III, computer simulation results are present-
selectivity order, and that the laTge effective length and
the ideal inte~leawing are two most important principles ed. Section IV contains the conclusions.
in designing STC’S for OFDM systems. Following these
principles, we propose a new class of trellis-structured II. PERFORMANCE ANALYSIS
STC’S. Compared with the conventional space-time trel-
lis codes, our proposed STC’S significantly improve the A. System Model
performance by efficiently exploiting both the spatial di-
versity