Joint Coded-Precoded OFDM with Low-Complexity Turbo-decoding

We combine error-control coding with linear precoding for flat-fading channels, as well as for wireless OFDM transmissions through frequency-selective fading channels. The performance is analyzed and compared with the standard coded system without precoding. By wedding linear precoding with conventional error-control coding, the diversity order becomes equal to the error-control code’s minimum Hamming distance, times the precoder size. We also derive a low-complexity turbo-decoding algorithm for joint coded-precoded transmissions. We analyze the decoding complexity, and compare it with existing alternatives. Extensive simulations with convolutional and turbo codes for HiperLan/2 channels support the analysis, and demonstrate superior performance of the proposed system.