Performance Analysis of Time-Reversal Based Precoding Schemes in MISO-OFDM Systems

Maaz, Mohamad; Hélard, Maryline; Mary, Philippe; Liu, Ming

doi:10.1109/vtcspring.2015.7146002

Cited by 15 publications

(13 citation statements)

References 15 publications

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“…Proof. According to (26) and (27), the mean value of the quadratic term Q Sig k,p can be obtained as, E Q Sig k,p = M + tr {ΓB p }, [29, p. 53], where we have used the fact that [b pp ] L = 1. Similarly, by noting that [a pq ] L = [c pq ] L = 0 for any p and q, and [b pq ] L = 0 for q = p, we can find the mean of the quadratic expression Q Intf k,p as E Q Intf k,p = tr {ΓΦ p } + (K − 1) tr {ΓΨ p }.…”

Section: A Tr-mrcmentioning

confidence: 99%

OFDM Without CP in Massive MIMO

Aminjavaheri

Farhang

RezazadehReyhani

et al. 2017

IEEE Trans. Wireless Commun.

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We study the possibility of removing the cyclic prefix (CP) overhead from orthogonal frequency division multiplexing (OFDM) in massive multiple-input multiple-output (MIMO) systems. We consider the uplink transmission while our results are applicable to the downlink as well. The absence of CP increases the spectral efficiency in expense of intersymbol interference (ISI) and intercarrier interference (ICI). It is known that in massive MIMO, the effects of uncorrelated noise and multiuser interference vanish as the number of base station (BS) antennas tends to infinity. To investigate if the channel distortions in the absence of CP fade away, we study the performance of the standard maximum ratio combining (MRC) receiver. Our analysis reveals that in this receiver, there always remains some residual interference leading to saturation of signal-tointerference-plus-noise ratio (SINR). To resolve this problem, we propose to use the time reversal (TR) technique. Moreover, in order to further reduce the multiuser interference, we propose a zero-forcing equalization to be deployed after the TR combining. We compare the achievable rate of the proposed system with that of the conventional CP-OFDM. We show that in realistic channels, a higher spectral efficiency is achieved by removing the CP from OFDM, while reducing the computational complexity.

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Section: A Tr-mrcmentioning

confidence: 99%

OFDM Without CP in Massive MIMO

Aminjavaheri

Farhang

RezazadehReyhani

et al. 2017

IEEE Trans. Wireless Commun.

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“…Its trade-off between the complexity and system performance, where the performance of the APT cooperative diversity system is significantly better than the BRS, but less than the MRT. On the other hand, the APT has less complexity at both the relays and the destination since the relay needs to know only its own channels [10], [11]. With out loss of generality, at each relay, the channel state information (CSI) is available, which mean that the relay knows the channels between (S → Relays → D).…”

Section: A Adaptive Power Techniquementioning

confidence: 99%

Performance Analysis of Adaptive Power Technique for Cooperative Diversity Communications

Alfitouri

Hamdi

2017

2017 IEEE Wireless Communications and Networking Conference (WCNC)

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Abstract-Cooperative diversity is a promising technique for use in wireless networks because it can provide diversity gain without the need to install multiple antennas at the source or destination. This paper is concerned with the performance analysis of a dual-hop random access network employed adaptive power technique (APT) relay in cooperative diversity networks. The network considered uses amplify-and-forward relaying, and is the only mean to connect source to its destination. This scheme is compared with such popular schemes as the orthogonal scheme, best relay selection, maximal ratio transmission (MRT) and the optimum combining scheme. A new unified mathematical method is developed, which leads to the derivation of new analytical expressions for the overall spectral-efficiency of the dual-hop random access network over Rayleigh fading channels. Numerical results show that the APT can benefit from an increase in the number of relays and reduction of the noise power at the relay and destination. The results also show that the performance of the APT is comparable to the other cooperative schemes, except the MRT. Furthermore, the new mathematical results obtained for APT have been confirmed by Monte Carlo simulation.

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“…1, depicts baseband implementation of our proposed TR-ZF algorithm in this paper. As one may realize, opposed to the conventional frequency domain equalization or TR-MRC implementations in the literature, [10], [11], where the BS has one OFDM demodulator per antenna, our approach only uses one OFDM demodulator per user. This obviously simplifies the BS structure as the number of users in massive MIMO is much smaller than the number of BS antennas.…”

Section: Proposed Tr-mrc With Post-equalizationmentioning

confidence: 99%

Time reversal with post-equalization for OFDM without CP in massive MIMO

Farhang

Aminjavaheri

Reyhani

et al. 2016

2016 International Symposium on Wireless Communication Systems (ISWCS)

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Abstract-This paper studies the possibility of eliminating the redundant cyclic prefix (CP) of orthogonal frequency division multiplexing (OFDM) in massive multiple-input multiple-output systems. The absence of CP increases the bandwidth efficiency in expense of intersymbol interference (ISI) and intercarrier interference (ICI). It is known that in massive MIMO, different types of interference fade away as the number of base station (BS) antennas tends to infinity. In this paper, we investigate if the channel distortions in the absence of CP are averaged out in the large antenna regime. To this end, we analytically study the performance of the conventional maximum ratio combining (MRC) and realize that there always remains some residual interference leading to saturation of signal to interference (SIR). This saturation of SIR is quantified through mathematical equations. Moreover, to resolve the saturation problem, we propose a technique based on time-reversal MRC with zero forcing multiuser detection (TR-ZF). Thus, the SIR of our proposed TR-ZF does not saturate and is a linear function of the number of BS antennas. We also show that TR-ZF only needs one OFDM demodulator per user irrespective of the number of BS antennas; reducing the BS signal processing complexity significantly. Finally, we corroborate our claims as well as analytical results through simulations.

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Performance Analysis of Time-Reversal Based Precoding Schemes in MISO-OFDM Systems

Cited by 15 publications

References 15 publications

OFDM Without CP in Massive MIMO

OFDM Without CP in Massive MIMO

Performance Analysis of Adaptive Power Technique for Cooperative Diversity Communications

Time reversal with post-equalization for OFDM without CP in massive MIMO

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