Improving performance of coherent coded It can be shown that if the channel estimates are perfect(a1=a1, a2 OFDM systems using space time transmit a2)diversity can be achieved
IEEE TRANSACTIONS ON COMMUNICATIONS. VOL 50. NO. 1 JANUARY 2002 LDPC-Based Space-Time Coded OFDM Systems Over Correlated Fading Channels: Performance Analysis and Receiver design Ben Lu, Student Member, IEEE, Xiaodong Wang, Member, IEEE, and Krishna R Narayanan, Member: IEEE AbstrackWe consider a space-time coded (STC) orthogonal systems integrate the techniques of antenna array spatial diver-
Space-Time Code Design in OFDM Systems Ben Lu and Xiaodong Wang Department of Electrical Engineering Texas A&M University, College Station, TX 7784 Er-mail:(benlu, wang]@ee. tamu.edu
Introduction Basic signal properties(dc, rms, dBm. and power) Fourier transform and spectra Linear systems and linear distortion Bandlimited signal and sampling Discrete Fourier transform · Bandwidth of signal
3.9 Time-Division Multiplexing Definition. Time-division multiplexing (TDM) is the time interleaving of samples from several sources so that the information from these sources can be transmitted serially over a single communication channel
5. Introduction (Chapter objectives) Amplitude modulation and single sideband Frequency and phase modulation Digitally modulated signals(OoK, BPSK, FSK, MSK MPSK, QAM, QPSK, a/4QPSK, and OFDM) Spread sprectrum and CDMa system
Introduction (chapter objectives) Bit error rate for binary systems (unipolar, polar, bipolar, ooK, BPsK, FsK, and MSK Output signal-to-noise ratio for analog systemS(AM, SSB, PM, and Fm)
