Performance Analysis of a Partially Coherent System Using Constellation Rotation and Coordinate Interleaving

Kiyani, Nauman F.; Weber, Jos H.

doi:10.1109/glocom.2008.ecp.826

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…It can be observed that a rotation operation requires 4 RMs and 2 RSs. However, when α = arctan (1/N ), the corresponding components are obtained by (18) and (19). As previously mentioned, the multiplication by a factor N can be implemented by (log 2 M ) /2 left-shifts.…”

Section: Complexity Analysismentioning

confidence: 93%

Uniformly Projected RCQD QAM: A Low-Complexity Signal Space Diversity Solution Over Fading Channels With or Without Erasures

Arbi

Geller

Yang

et al. 2018

IEEE Trans. on Broadcast.

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Abstract-Rotated and cyclic Q-delayed (RCQD) M -QAM (Quadrature Amplitude Modulation) provides signal space diversity and thus improves system performance over fading channels. However, previously published RCQD solutions were designed without fully considering the high demodulation complexity which prohibits wider applications. In this paper, a complete solution is proposed to reduce complexity for both the modulator and the demodulator. This solution uses a series of rotation angles α =arctan(1/ √ M ) which bring many interesting properties to the RCQD signals. A simplified sphere demapping algorithm is derived for fading channels with and without erasure events. In contrast to the sphere-decoder used for MIMO detection, the radius of the proposed sphere-demapper involves an exact amount of constellation points, thereby ensuring to perform the soft demapping operation successfully. Moreover, when either the in-phase (I) or the quadrature component (Q) is erased, the proposed demapping algorithm performs as well as the fullcomplexity Max-Log algorithm, with a reduced complexity. Compared to the solution currently used in DVB-T2, the proposed method reduces tremendously the computational complexity while still achieving similar performance over fading channels and even better performance over fading erasure channels.

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Section: Complexity Analysismentioning

confidence: 93%

Uniformly Projected RCQD QAM: A Low-Complexity Signal Space Diversity Solution Over Fading Channels With or Without Erasures

Arbi

Geller

Yang

et al. 2018

IEEE Trans. on Broadcast.

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show abstract

“…Many papers tried to solve this problem, which can be classified mainly into two categories: rotation for uncoded systems [1], [2], [3], [4], [5] and for coded systems [6], [7], [8], [9], [10], [11], [12], [13], [14], [15]. As practical systems always require channel coding, optimization work for coded system is more important.…”

Section: Introductionmentioning

confidence: 99%

Coded Modulation with Signal Space Diversity

Xie

Song

Peng

et al. 2011

IEEE Trans. Wireless Commun.

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Signal space diversity (SSD) is a well-known powerand bandwidth-efficient diversity technique with constellation rotation and coordinate interleaving. This paper investigates issues of combining SSD with coded modulation systems (CMSs), e.g., bit-interleaved coded modulation (BICM) and its iterative version, BICM-ID. It demonstrates that the average mutual information (AMI) between the signal after rotated constellation mapping and the signal before or after the soft demapper varies with the rotation angle. A new criterion for determining the optimal rotation angle by maximizing such AMI is therefore proposed. Specific considerations of combining SSD with BICM (BICM-SSD) and BICM-ID (BICM-ID-SSD) are addressed. The demapper's extrinsic information transfer (EXIT) curve in traditional BICM-ID systems exhibits different slopes under different channels, which consequently prevents traditional BICM-ID systems from having simultaneously excellent performance under different channels. It is shown that such a different-slope problem can be simply mitigated by a proper use of SSD. Analysis and simulation show that the proposed BICM-ID-SSD systems hold a near-capacity performance under both additive white Gaussian noise (AWGN) and Rayleigh fading channels simultaneously.

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“…The performance of the modulation diversity technique has been evaluated considering different scenarios, which include M-ary phase shift keying (M-PSK) and M-ary quadrature amplitude modulation (M-QAM) constellations for Rayleigh fading channels [5,7,8,12], Rician fading channels [13,14] and Nakagami-m fading channels [11,15]. However, in some specific scenarios, the tails of those fading distributions do not properly fit the experimental measured data, as discussed in [16].…”

Section: Introductionmentioning

confidence: 99%

Performance of the modulation diversity technique for κ-μ fading channels

Lopes

Queiroz

Lopes

et al. 2013

J Wireless Com Network

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The performance of wireless communication systems can be significantly improved using the modulation diversity technique, which is based on the combination of a suitable choice of the reference angle of a signal constellation with independent interleaving of the symbol components. This technique has been evaluated considering different fading channel models, such as Rayleigh, Rice and Nakagami-m. However, in some specific scenarios, the tails of those fading distributions do not properly fit the experimental measured data, which demands the use of more general channel distributions. This article presents a performance evaluation of the modulation diversity technique for κ-μ fading channels. New expressions for the PEP (Pairwise Error Probability) are obtained using numerical integration, series representation and upper/lower bounds. The evaluation, based on Monte Carlo simulation, demonstrates that the performance gain of the modulation diversity increases as the fading becomes more severe. Communications channels exhibit some degree of time correlation, which cannot be perfectly estimated, affecting the performance of the modulation diversity system. Thus, a performance evaluation of the system, concerning the presence of temporal correlation and estimation errors in the channel is also presented in the article.

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Performance Analysis of a Partially Coherent System Using Constellation Rotation and Coordinate Interleaving

Cited by 5 publications

References 8 publications

Uniformly Projected RCQD QAM: A Low-Complexity Signal Space Diversity Solution Over Fading Channels With or Without Erasures

Uniformly Projected RCQD QAM: A Low-Complexity Signal Space Diversity Solution Over Fading Channels With or Without Erasures

Coded Modulation with Signal Space Diversity

Performance of the modulation diversity technique for κ-μ fading channels

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