Adaptive Zero-Padding OFDM for Wireless Communications

摘要

In this paper we present a novel bandwidth (BW) efficient orthogonal frequency division multiplexing (OFDM) scheme with adaptive zero-padding (AZP-OFDM) for wireless transmission. Redundancy issues in the existing cyclic prefix (CP) and zero-padding (ZP) based OFDM as weLl as no-guard-interval (NGI) systems are analyzed, A novel system design criterion based on the channel matrix condition is studied and applied in the design of an adaptive zero-padding (AZP) OFDM system. Simulation results show that the proposed AZP-OFDM offers performance similar to that of the CP based scheme, complexity similar to that of ZP based schemes, with BW efficiency higher than that of both CP- and ZP-OFDM. Essentially, AZP-OFDM offers a better tradeoff between symbol recovery, BW efficiency, and complexity and more flexibility for implementation.