Date Added: Jun 2009
A cognitive radio system needs accurate knowledge of the radio spectrum it operates in. Blind modulation recognition techniques have been proposed to discriminate between single-carrier and multi-carrier modulations and to estimate their parameters. Some powerful techniques use auto-correlation- and cyclic auto-correlation-based features of the transmitted signal applying to OFDM signals using a Cyclic Prefix time guard interval (CP-OFDM). In this paper, the authors propose a blind parameter estimation technique based on a power auto-correlation feature applying to OFDM signals using a Zero Padding time guard interval (ZP-OFDM) which in particular excludes the use of the auto-correlation- and cyclic auto-correlation-based techniques.