Timing issue in OFDM

1. What is time offset in OFDM?
2. What issue is caused by phase noise in OFDM system?
3. What is the main objective of time synchronization for OFDM?

What is time offset in OFDM?

There, a symbol timing offset is the fractional interval between 0 to symbol time TM due to the necessity of just 1 sample/symbol for symbol detection. Here, while the sample/symbol is still 1 , these symbols are grouped into N samples of an OFDM symbol.

What issue is caused by phase noise in OFDM system?

Recent studies have shown that even small phase noise destroys orthogonalities between OFDM subcarrier signals and subsequently gives rise to both common phase error (CPE) and intercarrier interference (ICI), causing significant performance loss [9-15].

What is the main objective of time synchronization for OFDM?

Therefore, the purpose of a timing recovery scheme in OFDM is to ensure that the FFT window starts from within the region of correct samples.