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Unified TimeFrequency OFDM Transmission with Self Interference Cancellation
Changyong PAN Linglong DAI Zhixing YANG
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E96A
No.4
pp.807813 Publication Date: 2013/04/01
Online ISSN: 17451337
DOI: 10.1587/transfun.E96.A.807
Print ISSN: 09168508 Type of Manuscript: PAPER Category: Communication Theory and Signals Keyword: orthogonal frequency division multiplexing, training sequence, interference cancellation, low complexity, spectral efficiency,
Full Text: PDF>>
Summary:
Time domain synchronous orthogonal frequency division multiplexing (TDSOFDM) has higher spectral efficiency than the standard cyclic prefix OFDM (CPOFDM) OFDM by replacing the random CP with the known training sequence (TS), which could be also used for synchronization and channel estimation. However, TDSOFDM requires suffers from performance loss over fading channels due to the iterative interference cancellation has to be used to remove the mutual interferences between the TS and the useful data. To solve this problem, the novel TS based OFDM transmission scheme, referred to as the unified timefrequency OFDM (UTFOFDM), is proposed in which the timedomain TS and the frequencydomain pilots are carefully designed to naturally avoid the interference from the TS to the data without any reconstruction. The proposed UTFOFDM based flexible frame structure supports effective channel estimation and reliable channel equalization, while imposing a significantly lower complexity than the TDSOFDM system at the cost of a slightly reduced spectral efficiency. Simulation results demonstrate that the proposed UTFOFDM substantially outperforms the existing TDSOFDM, in terms of the system's achievable bit error rate.

