Optimized Rotations for LDPC-Coded MPSK Constellations with Signal Space Diversity

Kiyani, Nauman F.; Rizvi, U.H.; Weber, Jos H.; Janssen, G. C. A. M.

doi:10.1109/wcnc.2007.130

Cited by 14 publications

(12 citation statements)

References 10 publications

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“…Separate interleaving of I and Q components results, for each symbol, in transmitting the I component x i during one fade interval and the Q component y i during another fade interval. This kind of interleaving adds diversity in the system as x i and y i experience independent fading [8].…”

Section: Rayleigh Fading Channelmentioning

confidence: 99%

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Iterative Demodulation and Decoding for Rotated MPSK Constellations with Convolutional Coding and Signal Space Diversity

Kiyani

Weber

2007

2007 IEEE 66th Vehicular Technology Conference

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Signal space diversity (SSD) with the rotation of the signal constellation using multi-level modulation schemes is known to provide good performance gains over fading channels. This paper studies the extension of such schemes with iterative demodulation and decoding using convolutional codes for MPSK signal constellations with different symbol mappings. It is shown that for a specific signal constellation and labeling using SSD on a Rayleigh fading channel, a well considered choice of the rotation angle leads to a significant gain over conventional bit interleaved coded modulation with iterative decoding (BICM-ID). Furthermore, the optimum rotation angle for the coded system is found to be dependent upon the symbol labeling and the number of iterations carried out at the receiver.

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Section: Rayleigh Fading Channelmentioning

confidence: 99%

“…The facts that I and Q components experience independent fading and that under rotation the symbol distance profiles change, imply that a system using SSD and rotation no longer exhibits equi-probable symbol error probabilities as is the case with conventional MPSK schemes [8].…”

Section: Symbol Detectionmentioning

confidence: 99%

Iterative Demodulation and Decoding for Rotated MPSK Constellations with Convolutional Coding and Signal Space Diversity

Kiyani

Weber

2007

2007 IEEE 66th Vehicular Technology Conference

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“…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%

“…The most promising coded modulation systems (CMSs) over fading channels are bit-interleaved coded modulation (BICM) [16] and its iterative version, BICM with iterative demapping and decoding (BICM-ID) [17], [18]. Combining BICM with SSD (BICM-SSD) is discussed in [6], [7], [8]. Chindapol and Ritcey [6] tried to find the optimal rotation angles for BICM-SSD systems over Rayleigh fading channels, wherein 1/2-rate convolutional codes with 4/16 quadratures amplitude modulation (QAM) and 8 phase shift keying (PSK) were considered.…”

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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“…In [8], SSD is introduced to the BICM by the means of modifications to the QAM constellation mapper and demapper so as to improve the BICM performance of QAM constellations for broadcasting applications. In [9], a LDPC-coded SSD scheme for multi-level modulation was presented. N.F.…”

Section: Introductionmentioning

confidence: 99%

An efficient MIMO scheme with signal space diversity for future mobile communications

Gao

2015

J Wireless Com Network

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An efficient wireless transmission scheme with the signal space diversity (SSD) is proposed to improve the performance of multiple-input multiple-output (MIMO) systems in fading channels. By introducing the rotated modulation and space-time component interleaver, the proposed scheme jointly optimizes channel coding, modulation, and MIMO and can improve the link reliability and energy efficiency. An optimum spatial component interleaver is proposed to maximize the MIMO achievable rate. Based on the average mutual information (AMI)-maximization criterion, the optimal rotation angles of real-valued signal and complex-valued QAM signal are investigated for the MIMO scheme. For the iterative demapping and decoding (ID) scheme, a simple genetic algorithm (GA) to search binary convolution code (BCC) is also put forward to match the rotated modulation. Simulation results show that the optimized BCC-coded MIMO scheme with SSD-ID outperforms the turbo-coded MIMO scheme with bit-interleaved coded modulation (BICM)-ID by 1.4 dB signal-to-noise ratio (SNR) gain, while the new scheme has much lower complexity. So, the proposed scheme is simple, efficient, and promising for future wireless communication systems.

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Optimized Rotations for LDPC-Coded MPSK Constellations with Signal Space Diversity

Cited by 14 publications

References 10 publications

Iterative Demodulation and Decoding for Rotated MPSK Constellations with Convolutional Coding and Signal Space Diversity

Iterative Demodulation and Decoding for Rotated MPSK Constellations with Convolutional Coding and Signal Space Diversity

Coded Modulation with Signal Space Diversity

An efficient MIMO scheme with signal space diversity for future mobile communications

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