Title :
BER optimized channel independent precoder for OFDM system
Author :
Lin, Yuan-Pei ; Phoong, See-May
Author_Institution :
Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan
Abstract :
We consider the minimization of bit error rate (BER) for OFDM systems with orthogonal precoders. For low SNR, we show that the conventional OFDM system is the optimal solution and the optimal precoder is the identity matrix. For high SNR, corresponding to a relatively practical range of BER, there are channel independent solutions for optimal precoders. One such solution is the DFT matrix and the resulting optimal transceiver becomes the single carrier transmission system. Furthermore, in this case the conventional OFDM system has the largest BER among all OFDM systems with orthogonal precoders.
Keywords :
OFDM modulation; discrete Fourier transforms; encoding; error statistics; matrix algebra; optimisation; BER minimization; BER optimized channel independent precoder; DFT matrix; Hadamard matrix; OFDM system; bit error rate; channel independent solutions; high SNR; identity matrix; low SNR; optimal precoder; optimal solution; optimal transceiver; orthogonal precoders; single carrier transmission system; Binary phase shift keying; Bit error rate; Error analysis; Finite impulse response filter; Frequency conversion; Mean square error methods; OFDM; Peak to average power ratio; Transceivers; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE
Print_ISBN :
0-7803-7632-3
DOI :
10.1109/GLOCOM.2002.1188099