Bit error rate performance of OFDM in narrowband interference with excision filtering

Jamal

Lecture Notes in Electrical Engineering

et al. 2014

The problem of mitigating narrowband interference (NBI) due to coexistence between Digital Video Broadcasting-Terrestrial (DVB-T) and International Mobile Telecommunication-Advanced (IMT-A) system is considered. It is assumed that a spectrum of IMT-A system between 790 and 862 MHz interfere the spectrum of the OFDM signal in DVB-T band. Two types of convolutional code (CC) which are non-systematic convolutional code (NSCC) and recursive systematic convolutional code (RSCC) are proposed to mitigate NBI. The performance of the two techniques is compared under additive white Gaussian noise (AWGN) channel. It is observed that NSCC has a better bit error rate (BER) performance than RSCC. The result showed good performance for low SNR (B5 dB).

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Use of Convolutional Code for Narrowband Interference Suppression in OFDM-DVBT System

Jamal

Lecture Notes in Electrical Engineering

et al. 2014

2010 European Wireless Conference (EW)

“…Among them, one of primary interest is data detection. As shown in [1], the errorrate of an uncoded OFDM system is substantially affected by NBI if the signal-to-interference ratio (SIR) is smaller than 15 dB.…”

Section: Introductionmentioning

confidence: 99%

Robust EM-based detection of BICM-OFDM transmissions in the presence of narrowband interference

Sanguinetti

Morelli

Poor

2010

Future wireless communications systems are expected to coexist with different commercial applications over the same frequency bands. This gives rise to co-channel interference, which strongly affects the error-rate performance. In this work, an orthogonal frequency-division multiplexing system with bitinterleaved coded-modulation is considered and the problem of data detection in the presence of unknown narrowband interference (NBI) is addressed. In particular, an iterative detector that operates according to the expectation-maximization algorithm is derived under the assumption that the interference power on each subcarrier can be modeled as a random variable with an inverse gamma distribution.Computer simulations indicate that the proposed solution is remarkably robust to NBI and outperforms existing alternatives in severe interference environments.

2008 the Fourth International Conference on Wireless and Mobile Communications

“…Many techniques are proposed in the literature for suppressing the interference in OFDM systems [1][2][3][4]. But all these techniques have some limitations.…”

Section: Introductionmentioning

confidence: 99%

Estimation of BT Interference in OFDM Sub Carriers with Training Signals

Roy

Jamadagni

2008

While wireless LAN (WLAN) is very popular now a days, its performance deteriorates in the presence of other signals like Bluetooth (BT) signal that operate in the same band as WLAN. Present interference mitigation techniques in WLAN due to BT cancel interference in WLAN sub carrier where BT has hopped but do not cancel interference in the adjacent sub carriers. In this paper BT interference signal in all the OFDM sub carriers is estimated. That is, leakage of BT in other sub carriers including the sub carriers in which it has hopped is also measured. BT signals are estimated using the training signals of OFDM system. Simulation results in AWGN noise show that proposed algorithm agrees closely with theoretical results.