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Adaptive Zero-Padding OFDM over Frequency-Selective Multipath Channels

Abstract

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 OFDM based on cyclic prefix (CP), zero-padding (ZP), 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 to the design of an AZP-OFDM system. Simulation results have shown that the proposed AZP-OFDM offers performance similar to that of CP-OFDM, complexity similar to that of ZP-OFDM, with BW efficiency higher than that of both CP- and ZP-OFDM in channels with small to moderate delay spread. In channels with large delay spread, AZP scheme adaptively maintains high performance at the expense of BW efficiency. Essentially, AZP-OFDM offers a more flexible tradeoff between symbol recovery, BW efficiency, and complexity.

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Correspondence to Neng Wang.

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Wang, N., Blostein, S.D. Adaptive Zero-Padding OFDM over Frequency-Selective Multipath Channels. EURASIP J. Adv. Signal Process. 2004, 598709 (2004). https://doi.org/10.1155/S1110865704311157

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Keywords and phrases

  • bandwidth efficiency
  • cyclic prefix
  • equalization
  • multipath channels
  • orthogonal frequency division multiplexing (OFDM)
  • zero-padding