Receiver Design for SIMO-OFDM Systems with Insufficient Cyclic Prefix

Pham, Tri; Martin, Philippa A.; Woodward, Graeme; Prasad, Kavirayani R.; Horn, Clive

doi:10.1109/vtcfall.2014.6966151

Cited by 8 publications

(2 citation statements)

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“…The simplifications above of the OFDM channels as single sum expressions mainly follows from classical OFDM derivations, e.g. in [9], [10] where derivation details are carried out for a causal channel; see also earlier works such as [11]- [13]. Extension of c[m] and cl,i [m] to negative delays are provided above for later use in this paper.…”

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confidence: 99%

Channel Shortening by Large Multiantenna Precoding in OFDM

Pitaval

2018

Preprint

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A channel delay spread larger than the cyclic prefix (CP) creates self-interference (ISI/ICI) in orthogonal frequency-division multiplexing (OFDM). Recent interests in low-latency application has motivated usage of shorter OFDM symbols. In turn, one can either downscale the CP at the cost of interference, or maintain the CP but with increased overhead. To simultaneously maintain low overhead and interference, this paper studies channel shortening methods exploiting the properties of large multiantenna precoding in OFDM. It is shown that ISI/ICI can be asymptotically canceled out by subcarrierlevel precoding with infinite number of antennas. The method, coined time-frequency (TF) precoding, is based on introducing time-delay selectivity inside conventional frequency-selective precoders in order to remove undesired delayed signals. This leads to an optimization trade-off in the precoder between interference mitigation and multi-path combining gain. Time-reversal (TR) filtering, where an OFDM signal without CP is filtered according to the multi-antenna channels, is considered as a benchmark since it provides asymptotically the optimal rate, having no CP overhead, and both full interferencecancellation and maximum muli-path combining gain. Meanwhile, finite-size analysis shows that TFprecoding converges faster to its asymptotic rate than TR-filtering, so that TF-precoding can outperform TR-filtering in the high-SNR regime with not-so-large number of antennas.

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Section: ) Receptionmentioning

confidence: 99%

Channel Shortening by Large Multiantenna Precoding in OFDM

Pitaval

2018

Preprint

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“…[4,5]. In [6], detailed derivations of OFDM channels as single sum expressions were summarized for the case of a causal channel. Writing the channel coefficients as such directly greatly simplifies the resulting SINR expression.…”

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A note on simplified SINR expressions for OFDM with insufficient CP

Pitaval

2021

Preprint

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This note provides derivation details of simplified OFDM transmission equation and resulting signal-to-interference plus noise ratio (SINR) for the case of an insufficient CP. Each channel component after demodulation is expressed as a single sum which can be interpreted a weighted Fourier transform of the channel impulse response. Specifically, for CP length N cp , FFT size N fft , N sc consecutively allocated subcarriers, and channel impulse response h

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A cyclic prefix based secure side-channel (CP-SSC) over OFDM for LTE D2D sidelink communication

Nain

Rajalakshmi

2021

Physical Communication

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Receiver Design for SIMO-OFDM Systems with Insufficient Cyclic Prefix

Cited by 8 publications

References 8 publications

Channel Shortening by Large Multiantenna Precoding in OFDM

Channel Shortening by Large Multiantenna Precoding in OFDM

A note on simplified SINR expressions for OFDM with insufficient CP

A cyclic prefix based secure side-channel (CP-SSC) over OFDM for LTE D2D sidelink communication

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