Communication receiving apparatus, signal receiving method thereof for recovering data and signal transmitting method for generating transmitting signal based on CDMA technology

A signal receiving method configured for a communication receiving apparatus based on CDMA, the signal receiving method comprising:

• receiving a RF signal and transforming the RF signal into a baseband signal, wherein the RF signal comprises a spread signal obtained from encoding an original data sequence based on a PGIS, wherein an autocorrelation function of the PGIS is a one-pulse sequence function and the PGIS has a spectrum with all equal magnitude;
• demodulating the baseband signal into a data stream;
• generating a plurality of despread sequences based on the PGIS;
• performing a modulo-N circular convolution on the despread sequences with the data stream, respectively, to obtain a plurality of decoding sequences;
• and
• selecting one data value from each of the decoding sequences to combine selected data values of the decoding sequence into at least one data value of the original sequence, respectively,
• so as to recover the data stream into the original data sequence based on the PGIS, wherein the original data sequence comprises an N data values, and N is a positive integer.

A signal transmitting method configured for a communication transmitting apparatus based on CDMA, the signal transmitting method comprising:

• performing a circular shift on a PGIS by 0 to N−1 positions to generate a plurality of spread sequences, wherein an original data sequence comprises N number of data values, N is a positive integer, and an autocorrelation function of the PGIS is a one-pulse sequence function and the PGIS has a spectrum with all equal magnitude;
• respectively multiplying the N number of data values of the original data sequence by the spread sequences to generate a plurality of encoding sequences;
• and
• combining and modulating the encoding sequences to generate a RF signal and transmitting the RF signal.