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Updated: Aug 15, 2025

Transcription Start Site Mapping Using Super-low Input Carrier-CAGE
Published on: June 26, 2019
BER Reduction and Capacity Enhancement with Novel Guard Sequence Selection for Multi-Carrier Communication
Oluwaseun Ologun1, Shaochuan Wu1, Raza Ali Shah2
1Communications Research Center, School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China.
Abstract:
Orthogonal frequency division multiplexing (OFDM) is an efficient multicarrier scheme that uses different types of guard intervals such as cyclic prefix (CP) and known symbol padding (KSP) (zero padding (ZP), unique word (UW), etc.) in block formation. Among these guard intervals, CP varies for each block, while other guard intervals remain fixed from block to block. These guard intervals efficiently perform channel estimation, synchronization and remove inter-block interference (IBI); nevertheless, none of the existing schemes develop any relationship between the guard interval (sequence) and the data symbols on different subcarriers of the OFDM block. We present a new idea of selecting the guard interval based on the data symbols of a subset of subcarriers in the block and exploit the high auto-correlation of the selected guard sequence to improve the bit error rate (BER) performance of the system. The results based on a fair comparison show that our enhanced orthogonal frequency division multiplexing (eOFDM) scheme inherits significant improvements in BER and the capacity of a multicarrier system as compared to the existing techniques.
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