Channel estimation for iterative decoding over fading channels

摘要: A method of coherent detection and channel estimation for punctured convolutional coded binary Quadrature Amplitude Modulation (QAM) signals transmitted over a frequency-flat Rayleigh fading channels used digital radio broadcasting transmission is presented. Some known symbols are inserted in the encoded data stream to enhance process. The pilot replace existing parity so no bandwidth expansion required. An iterative algorithm that uses decoding information as well contained improve parameter estimate. scheme complexity grows exponentially with filter length. performance system compared normalized rate both perfect (corresponding knowledge process noise variance) differential Differential Phase Shift Keying (DAPSK). tradeoff between simplicity implementation bit-error-rate different techniques also compared.