Patent ID: 9698941
Date: 2017-07-04
CPC Classifications: G06F,H03M,H04B,H04L,H05K

Claim:
1. A method for iteratively decoding a digital signal, the signal being an Orthogonal Frequency-Division Multiplexed (OFDM) signal comprising OFDM reference subcarriers, OFDM data subcarriers, and OFDM symbol intervals, the method comprising: a. performing OFDM demodulation and subcarrier de-mapping of the digital signal into system control and data sequence symbols to obtain received distorted modulated symbols; b. performing initial channel state information estimation based on the received distorted modulated symbols, wherein said received distorted modulated symbols are carried by a plurality of OFDM data subcarriers and a plurality of OFDM reference subcarriers in at least one OFDM symbol interval; c. performing phase correction of the received distorted modulated symbols based on the initial channel state information estimation into coherent demodulated signals; d. performing symbol-to-bit demapping of the coherent demodulated signals by calculating log-likelihood ratios of the system control and data sequences symbols; e. producing, by a decoder, one or more logical channel signals by de-interleaving and demultiplexing the log-likelihood ratios of the system control and data sequences symbols; f. processing the one or more logical channel signals by producing, by the decoder of step e., soft estimates of convolutional code coded bits using soft-input soft-output decoding of one or more convolutional codes associated with the one or more logical channels; g. calculating improved channel state information by performing at least one additional iteration of channel state information estimation based on at least some of said soft estimates of convolutional code coded bits; and h. performing enhanced convolutional decoding of a set of data associated with the digital signal using said improved channel state information.