Performance Comparison: PN Sequence-Based Cyclic Prefix vs Traditional Comb-Type Pilot Channel Estimation in OFDM Systems

In OFDM systems, PN sequences can be utilized as cyclic prefix alternatives, providing a comparative analysis with traditional comb-type pilot channel estimation methods. The implementation of cyclic prefixes effectively mitigates multipath interference and frequency offset impacts, thereby enhancing system performance stability through guard interval insertion and IFFT/FFT processing techniques. Traditional comb-type pilot channel estimation represents a widely adopted approach where comb-structured pilot sequences are inserted into specific subcarriers during the symbol mapping phase. This method enables accurate channel estimation and correction through interpolation algorithms like linear or spline interpolation between pilot subcarriers, typically implemented using MATLAB's interp1 function or similar DSP library functions. By comparing PN sequence-based cyclic prefix implementations (involving correlation-based synchronization and pseudorandom sequence generation using polynomials) with conventional comb-pilot methods, researchers can conduct comprehensive performance evaluations analyzing key metrics such as BER (Bit Error Rate), MSE (Mean Square Error), and computational complexity. This comparison facilitates optimal method selection based on specific system requirements involving Doppler effects, channel delay spread, and implementation constraints.