Constrained Capacity Optimal Generalized Multi-User MIMO: A Theoretical and Practical Framework

Chi, Yuhao; Liu, Lei; Song, Guanghui; Li, Ying; Guan, Yong Liang; Yuen, Chau

doi:10.1109/tcomm.2022.3207813

Cited by 17 publications

(3 citation statements)

References 38 publications

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“…SSE provides a neat way of pooling the resources of users together such that the overall error performance of all the users is improved while still meeting the low latency requirements of URLLC communication. Prob(atleast one user in error) 5) Coded multi-user communication using SPARC: AMP and OAMP/VAMP have been used in multi-user (MU) MIMO schemes, in conjunction with properly designed forward error control codes (FEC) to achieve constrained capacity [45], [46]. Other techniques such as coded compressed sensing techniques have been proposed that can work with MU single antenna systems [47], [48].…”

Section: Comparison With Existing Codesmentioning

confidence: 99%

Generalized Sparse Regression Codes for Short Block Lengths

Kumar Sinha,

kannu

2023

Preprint

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<p>Sparse Regression Code (SPARC) connects the sparse signal recovery framework with the error control coding techniques. In this paper, we focus on improving the block error performance of SPARC in short block length regime over the AWGN channel. Towards that, we introduce suitable candidates for dictionary matrices in real and complex fields using Gold sequences and mutually unbiased bases (MUB). We propose two generalizations of SPARC (GSPARC), develop a greedy decoder called Match and Decode (MAD) algorithm, and provide its analytical noiseless recovery guarantees. We propose a parallel greedy search technique called parallel MAD (PMAD) to improve performance. We describe the applicability of GSPARC with PMAD decoder for multi-user channels, providing a non-orthogonal multiple access scheme. We present numerical results comparing the block error rate (BLER) performance of the proposed algorithms for GSPARC in AWGN channels in the short block length regime. The PMAD decoder gives better BLER than the approximate message-passing decoder for SPARC. GSPARC with PMAD gives comparable and competitive BLER performance compared to other existing codes. In multi-user channels, GSPARC with PMAD decoder outperforms the sphere packing lower bounds of an orthogonal multiple access scheme with the same spectral efficiency.</p>

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Section: Comparison With Existing Codesmentioning

confidence: 99%

Generalized Sparse Regression Codes for Short Block Lengths

Kumar Sinha,

kannu

2023

Preprint

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“…Even when functionality at the receiver is split into the roles of MUD and single user decoding, using an optimal multiuser detector is still computationally costly. For this reason, using suboptimal detectors is common in iterative systems, which incurs a performance loss in terms of possible system load, output bit error rate (BER) and speed to convergence [18,19]. The tables of symbols and acronyms are given in Tables 1 and 2.…”

Section: Introductionmentioning

confidence: 99%

Performance of Iterative Coded CDMA Receivers with APP Feedback: A Use of a Weighted Delay Filter

Altalbe

Tahir

2023

Applied Sciences

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The prohibitive computational complexity of optimal coded multiuser detection necessitates using suboptimal detectors in practical implementations. The filter is very computationally simple and is also demonstrated to provide faster convergence and superior bit error rate (BER) performance. Further investigation of the weighted delay filter concept produces a second filter—derived via the joint likelihood function. It is analytically demonstrated that extrinsic feedback systems will not benefit from weighted delay filtering. A system model is provided that introduces the notion of feedback ‘residue’, which is shown to be the key difference between a-posterior probability (APP) and extrinsic systems when determining the parallel interference cancellation (PIC) output statistics. It is analytically shown that the weighted delay filter derived via a maximum signal-to-noise ratio (SNR) approach is identical to a weighted delay filter derived via the joint likelihood function. It is analytically shown that when extrinsic feedback is used in a coded-code division multiple access (C-CDMA) system, no benefit will be realised by weighted delay filtering, as soft outputs from previous cycles are a merely scaled, noisy version of the most recent data. The notion of a ‘feedback residue’ for systems with APP feedback is introduced, and it is empirically shown that this residue term is a key consideration when determining the PIC output statistics. Using the ‘residual feedback’ model, it is shown that when APP feedback is utilised, data from previous cycles is not simply “a scaled, noisy version” of the current data. For this reason, benefits may be realised by APP feedback use. The simulation results shows that the residue may be trivial at small loads, the residue builds to the substantial value of nearly 0.4 at a reasonably modest load of K/N=15/10, and continues to grow as the load increases.

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“…Multiple-input multiple-output (MIMO) systems have emerged as an essential technology expected to deliver significant performance enhancements in 6G by leveraging spatial diversity and multiplexing gains [3]. Thus, the MIMO techniques have been applied to the various communication systems, such as massive MIMO systems [4]- [6], multiuser MIMO (MU-MIMO) systems [7]- [10], and cell-free MIMO systems [11]- [14]. These MIMO systems have shown noticeable performance improvement in spectral and energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Single-User SFLC-OFDM System Realization Based on Channel Reciprocity Recovery

Kim,

Lee,

Lee

et al. 2023

IEEE Access

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This paper demonstrates the implementation of a space-frequency line coded-orthogonal frequency-division multiplexing (SFLC-OFDM) system. The SFLC-OFDM system utilizes downlink channel state information at the transmitter, which can be obtained from uplink channel estimation under channel reciprocity assumption between uplink-and-downlink channels. However, in practical implementations, channel reciprocity is violated due to the imperfect synchronization and radio frequency chain mismatch between transceivers. To recover the channel reciprocity, frequency-domain signal processing methods are proposed. Furthermore, a low computational complexity single-instruction multiple-data method is implemented to meet the time constraints in real-time operating systems. The experimental results demonstrate that channel reciprocity can be effectively recovered in the implemented SFLC-OFDM system, resulting in practical communication performance regarding the symbol error rate.INDEX TERMS Space-frequency line code (SFLC), orthogonal frequency-division multiplexing (OFDM), synchronization, channel reciprocity, Software-defined radio (SDR), single-instruction multipledata (SIMD) method.

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Constrained Capacity Optimal Generalized Multi-User MIMO: A Theoretical and Practical Framework

Cited by 17 publications

References 38 publications

Generalized Sparse Regression Codes for Short Block Lengths

Generalized Sparse Regression Codes for Short Block Lengths

Performance of Iterative Coded CDMA Receivers with APP Feedback: A Use of a Weighted Delay Filter

Single-User SFLC-OFDM System Realization Based on Channel Reciprocity Recovery

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