Intercarrier interference (ICI) analysis using correlative coding OFDM system

Concatenated Precoded OFDM for CFO Effect Mitigation

“…In processing d (l) by S, M leading pilot symbols remain unchanged, whereas N − M − 2 data symbols are correlatively precoded by g (as in [15] and [16]) to endow the received data signal with ICI self-cancelation capability and permit data detection by Viterbi decoding. To enable the proposed receiver to make an embedded estimation on TCMD without significantly being affected by ICI and then to associate Viterbi decoding with TCMD compensation,…”

“…Because z (l) contains i.i.d. CSCG noise samples, the approximate model in (16) reveals that an approximate ML estimation for faded TCMD β can be formulated as…”

“…To suppress ICI without remarkably sacrificing data throughput, correlative coding was found in [15] and [16] to reduce ICI power effectively and enable efficient Viterbi decoding at the receiver. In [15], the correlative coding approach was originally proposed to reduce the ICI power at the output of OFDM demodulator effectively, although not minimizing the ICI power in any sense.…”

“…Similar to the Zhao-Haggman approach, the SCSR, CC, PRCC, and ACC approaches achieve the suppression performance by employing 0018-9545/$31.00 © 2013 IEEE data-symmetric subcarrier signaling formats and, thus, operate at the cost of halving the data throughput. Without sacrificing the data throughput remarkably, correlatively coded OFDM was proposed otherwise in [15] and [16] to suppress ICI. By applying correlative coding, which was exploited originally in band-limited digital communications [17], [18] and then in spectrally precoded OFDM [19] and constant-envelope OFDM [27], into subcarrier symbols successively, correlatively coded OFDM effectively reduces the ICI power and permits data detection by Viterbi decoding.…”

Correlatively coded OFDM

“…This spectral property dramatically reduces the amount of excessive intersymbol interference at the receiver when the symbol timing is not perfectly synchronized. Operating on the data block in frequency domain, correlative coding has been recently applied in OFDM to suppress interchannel interference [18]- [19], reduce peak-to-average power ratio [20], and counteract channel effects [21]- [23]. Particularly, correlatively coded OFDM has been widely used to provide high degree of robustness against deep fades, and is much more popularly known as precoded OFDM in this context (see [21]- [22] and references therein).…”