A novel ICI cancellation scheme to reduce both frequency offset and IQ imbalance effects in OFDM

Sathananthan, K.; Athaudage, C.R.N.; Qiu, Bin

doi:10.1109/iscc.2004.1358623

Cited by 39 publications

(39 citation statements)

References 9 publications

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“…In this method, copies of the same data symbol are modulated on r adjacent sub-carriers using specific weights. This method can reduce the ICI at the price of lowering the transmission rate by a factor r. To further improve the ICI self-cancellation performance, many researchers proposed more efficient mapping (optimized weighting coefficients) for the redundant data symbol modulated over adjacent or non-adjacent subcarriers [20][21][22][23][24][25][26][27]. The weights are designed such that, at the receiver, the ICI at each subcarrier is reduced when a frequency [28,29].…”

Section: Related Workmentioning

confidence: 99%

Coding to reduce the interference to carrier ratio of OFDM signals

Smida

2017

J Wireless Com Network

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In this paper, we propose a simple approach to reduce the sensitivity of OFDM system to the carrier frequency offset (CFO). The main idea is to choose a well-known channel code and to rotate each coordinate by a fixed phase shift such that the maximum inter-carrier interference (ICI) taken over all sub-carriers is minimized. This approach is based on a geometric interpretation of the peak interference to carrier ratio (PICR) of OFDM signals. Simulation results show that a reduction in PICR of 7 dB can be easily achieved. Furthermore, we addressed the fundamental limit of the proposed technique by providing both an exact and an approximate lower bound of PICR of phase-shifted binary codes. The bounds are applied to some codes: non-redundant binary code, BCH codes, and Reed-Muller codes. Simulation results demonstrated that phase-shift designs approach lower bounds and are resilient to CFO change.

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Section: Related Workmentioning

confidence: 99%

Coding to reduce the interference to carrier ratio of OFDM signals

Smida

2017

J Wireless Com Network

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“…The first term of (25) represents a desired signal rotated by CPE, and the second term is the ICI. The CPE can be reduced to zero using the symmetric conjugate property of the ICI weighting function (9), and the ICI term can be suppressed by property (10). The data X k can be estimated as follows:…”

Section: System Modelmentioning

confidence: 99%

Efficient ICI Self-Cancellation Scheme for OFDM Systems

Kim

Seo

2014

ETRI J

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In this paper, we present a new inter-carrier interference (ICI) self-cancellation scheme -namely, ISC schemefor orthogonal frequency-division multiplexing systems to reduce the ICI generated from phase noise (PHN) and residual frequency offset (RFO). The proposed scheme comprises a new ICI cancellation mapping (ICM) scheme at the transmitter and an appropriate method of combining the received signals at the receiver. In the proposed scheme, the transmitted signal is transformed into a real signal through the new ICM using the real property of the transmitted signal; the fast-varying PHN and RFO are estimated and compensated. Therefore, the ICI caused by fast-varying PHN and RFO is significantly suppressed. We also derive the carrier-to-interference power ratio (CIR) of the proposed scheme by using the symmetric conjugate property of the ICI weighting function and then compare it with those of conventional schemes. Through simulation results, we show that the proposed ISC scheme has a higher CIR and better bit error rate performance than the conventional schemes.

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“…So if we put the same constellation on symmetrical subcarriers, we may be able to combine the symbols at the receiver in a way such that the phase shifts on these two subcarriers caused by SFO can approximately cancel each other. This mapping can be called "Symmetric Symbol Repetition (SSR)", which is different from other selfcancellation techniques, such as "Adjacent Symbol Repetition (ASR)" (Zhao & Haggman, 2001), "Adjacent Conjugate Symbol Repetition (ACSR)" (Sathananthan, 2004), and "Symmetric Conjugate Symbol Repetition (SCSR)" (Tang, 2007). It should be pointed out that the self-cancellation of the phase shifts caused by SFO on symmetric subcarrier cannot be achieved by other repetition schems.…”

Section: The Idea Of Sfo Self-cancellation Schemementioning

confidence: 99%