SYSTEM AND METHOD FOR IMPROVING RECEIVER SENSITIVITY OF A DD-OFDM SYSTEM WITHOUT USING FREQUENCY GUARD BAND

摘要

The present invention discloses a system and method for improving receiver sensitivity of an DD-OFDM system without using frequency guard band. The method comprises: interleaving input data to the DD-OFDM system to generate intereaved data; encoding the input data with a first recursive systematic convolutional code to generate a first recursive systematic convolutional encoded data; encoding the intereaved data with a second recursive systematic convolutional code to generate a second recursive systematic convolutional encoded data; puncturing the first recursive systematic convolutional encoded data and the second recursive systematic convolutional encoded data to generate a parity sequence; and combining the input data with the parity sequence to generate coded DD-OFDM data; wherein the parity sequence is generated by using different puncturing rates for different OFDM subcarriers, so as to obtain higher spectral efficiency. The system and the method can improve the receiver sensitivity and the spectral efficiency without frequency guard band by using the ACE and interleaver techniques in the DD-OFDM system.