Direct detection method and system for biased double-sideband signal based on CADD receiver

• Main Authors: WANG ZHIGUO, GE PEIYUN, YANG FAN, GAO HONGBING, SUN WEIBIN, QIN PENG, BAI CHENGLIN, QI QI, YANG LISHAN, LUO XUEYUAN, SUN ZUKAI, ZHOU TANGLEI, XU HENGYING
• Format: Patent
• Language: Chinese; English
• Published: 30.09.2022
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION

The invention discloses a direct detection method and system for bias double-sideband signals based on a CADD receiver, and the detection method comprises the steps: carrying out the pulse shaping of two paths of independent signals at a transmitting end; performing up-conversion on the two paths of formed signals to obtain a left sideband signal and a right sideband signal, and reserving a frequency gap with the same width as the signal bandwidth in the middle of the frequency spectrum of the left sideband signal and the right sideband signal; adding the left sideband signal and the right sideband signal to obtain a bias twin single sideband signal; at a receiving end, the SSBI generated by the CADD receiver falls in a frequency gap of the bias twin single-side band signal; performing down-conversion on the received signal; and the matched filter is used as a low-pass filter to recover a corresponding sideband receiving signal. According to the invention, the frequency gap with the same width as the signal b