Performance of Noncoherent Maximum-Likelihood Sequence Detection for Differential OFDM Systems With Diversity Reception

Lin, Ding‐Bing; Chiang, Ping-Hung; Li, Hsueh‐Jyh

doi:10.1109/tbc.2005.857604

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…However, grouping the subcarriers is infeasible over fast fading channels, or when the OFDM symbol duration is short. A non-coherent maximum-likelihood sequence detection for differential OFDM with multiple receivers is presented in [38]. The system utilize the widely used suboptimal detector [39,Eq.…”

Section: B Related Workmentioning

confidence: 99%

Direct Data Detection of OFDM Signals Over Wireless Channels

Saci

Al-Dweik

Shami

2020

IEEE Trans. Veh. Technol.

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This paper presents a novel efficient receiver design for wireless communication systems that incorporate orthogonal frequency division multiplexing (OFDM) transmission. The proposed receiver does not require channel estimation or equalization to perform coherent data detection. Instead, channel estimation, equalization, and data detection are combined into a single operation, and hence, the detector performs a direct data detector (D 3). The D 3 is applied to key practical wireless systems such as the Long Term Evolution (LTE) and the New Radio (NR) of the fifthgeneration (5G) system. The performance of the proposed D 3 is thoroughly analyzed theoretically in terms of bit error rate (BER), where closed-form accurate approximations are derived for several cases of interest, and validated by Monte Carlo simulations. Moreover, extensive complexity analysis are performed to evaluate the system suitability for implementation. The obtained theoretical and simulation results demonstrate that the BER of the proposed D 3 is only 3 dB away from coherent detectors with perfect knowledge of the channel state information (CSI) in flat and frequency-selective fading channels for a wide range of signal-to-noise ratios (SNRs). If CSI is not known perfectly, then D 3 outperforms the coherent detector substantially, particularly at high SNRs with linear interpolation. The computational complexity of D 3 depends on the length of the sequence to be detected, nevertheless, a significant complexity reduction can be achieved using the Viterbi algorithm.

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Section: B Related Workmentioning

confidence: 99%

Direct Data Detection of OFDM Signals Over Wireless Channels

Saci

Al-Dweik

Shami

2020

IEEE Trans. Veh. Technol.

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Synchronized OFDM System Using Inter-Symbol Pilots

Raajan¹,

Philomina²,

Avudaiappan³

et al. 2012

Procedia Engineering

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Decision Feedback Differential Detection with Postdetection Diversity Reception for DPSK/OFDM Systems

Lee

Choi

Seo

2007

The 9th International Conference on Advanced Communication Technology

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This paper presents a scheme of decision feedback differential detection (DF-DD) with postdetection diversity reception for differential phase shift keying (DPSK)/ orthogonal frequency division multiplexing (OFDM) systems. The DF-DD overcomes the degradation of bit error rate (BER) performance caused by conventional DD. The DF-DD with Postdetection diversity reception can combat the inter-carrier interference (ICI) in OFDM systems and achieve better BER performance as compared to DF-DD without postdetection diversity reception. In this correspondence, we combined two techniques, DF-DD and postdetection diversity reception, in DPSK/OFDM systems. Simulation results show that the DF-DD with postdetection diversity reception can provide a reliable BER performance comparable to conventional DD without postdetection diversity reception.Keywords -Decision feedback differential detection (DF-DD), differential phase shift keying (DPSK), orthogonal frequency division multiplexing (OFDM), postdetection diversity reception. I . IntroductionIt is well known that orthogonal frequency division multiplexing (OFDM) is attractive for high-rate wireless data transmission systems, such as terrestrial mobile communication, specifically terrestrial digital multimedia broadcasting (T-DMB) system, digital terrestrial TV broadcasting system, wireless LAN and so on, because of its high spectrum efficiency and its resistance to multipath fading [1],[2]. Beside the above advantages, however, inter-symbol interference (ISI), which is caused by delay time spread, and inter-carrier interference (ICI), which is caused by Doppler frequency shift, give intolerable degradation to bit error rate (BER) performances over fading channels [2]- [5]. The ISI can be easily neglected when multipath delay is within a guard interval (GI). However, the ICI cannot be canceled without receiver's ideal estimation [6].In OFDM systems with differential phase shift keying (DPSK), it is possible to apply the differential modulation in the time or frequency domain depending on the condition of fading channels, such as Doppler frequency shift and delay time spread [7], [8]. Since acquiring and tracking a reference signal for coherent detection under multipath fading environments are very difficult, differential detection (DD) of differential phase shift keying (DPSK) signals is preferred.However, DD uses a delayed version of the received signal as a phase reference, and, thus, in fading channels, DD make a degradation of bit error rate (BER) performance and its BER performance exhibits an error floor (referred to as the irreducible BER due to Doppler frequency shift).Diversity reception techniques are attractive structure to combat ICI problem in OFDM systems. Especially, postdetection diversity reception for DPSK is very attractive because the cophasing function necessary in predetection combiners is not required [9]. DF-DD can improve conventional differential detection (DD) significantly because DF-DD can overcome the degradation of BER performance caused by conven...

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Performance of Noncoherent Maximum-Likelihood Sequence Detection for Differential OFDM Systems With Diversity Reception

Cited by 7 publications

References 18 publications

Direct Data Detection of OFDM Signals Over Wireless Channels

Direct Data Detection of OFDM Signals Over Wireless Channels

Synchronized OFDM System Using Inter-Symbol Pilots

Decision Feedback Differential Detection with Postdetection Diversity Reception for DPSK/OFDM Systems

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