Are replicas of the transmitted signals, used as reference signals, insufficient and inadequate for demodulation?
Hello,
Basis functions in correlation receivers are very convenient for many reasons:
The most obvious scenario is M-ary signaling such as M-QAM where only two basis functions are used to modulate and demodulate up to M possible signals, by just varying the in-phase and quadrature components according a signal mapping table.
The correlator receiver makes decisions based on the location of the received in-phase and quadrature components in a 2-dimensional signal space. Another advantage of the basis function is in analysis of optimum receiver performance as Mathematical analysis of Energy efficiency and probability of errors is simplified. For more explanation consult one of the common digital communication books such as the one by Ha Nguyen and ED Shwedyk (A first course in Digital communications) Sections 5.1-5.5, or Proakis and Salehi (chapter 7)
- Badges
- Science topic
- Similar topics
- Engineering
- Electrical Engineering
- Signal Processing