Patent ID: 7724833

Claim:
An LDPC based TDS-OFDM receiver for receiving and demodulating an RF signal modulated using a TDS-OFDM (Time-Domain Synchronous Orthogonal Frequency-Division Multiplexing) modulation scheme and encoded using an LDPC (low density parity check) code, the RF signal being downconverted to an IF signal, the receiver comprising: a synchronization block receiving a digital IF signal indicative of the IF signal and generating a baseband signal from the digital IF signal, the synchronization block performing correlation of a PN sequence in a signal frame of the received RF signal with a corresponding locally generated PN sequence, the PN sequence correlation providing signals for performing carrier recovery, timing recovery and parameters for channel estimation; an equalization block for performing channel estimation and channel equalization; an OFDM demodulation block for performing demodulation on the baseband signal, the OFDM demodulation block recovering OFDM symbols in the signal frame of the RF signal and converting the OFDM symbols to frequency domain; and a FEC (forward error correction) decoder block comprising an LDPC decoder for decoding the OFDM symbols based on the LDPC (low density parity check) code to generate a digital output signal indicative of the data content of the RF signal.