Low-Density Spreading Design Based on an Algebraic Scheme for NOMA Systems

  title={Low-Density Spreading Design Based on an Algebraic Scheme for NOMA Systems},
  author={Goldwyn Millar and Michel Kulhandjian and Ayşe Alaca and Saban Alaca and Claude D’amours and Halim Yanikomeroglu},
  journal={IEEE Wireless Communications Letters},
In this letter, a code-domain nonorthogonal multiple access (NOMA) technique based on an algebraic design is studied. We propose an improved low-density spreading (LDS) sequence design based on projective geometry. In terms of its bit error rate (BER) performance, our proposed improved LDS code set outperforms the existing LDS designs over the frequency-nonselective Rayleigh fading and additive white Gaussian noise (AWGN) channels. We demonstrated that achieving the best BER depends on the… 

Figures and Tables from this paper

Beyond Equal-Power Sparse NOMA: Two User Classes and Closed-Form Bounds on the Achievable Region

Non-orthogonal multiple access (NOMA) is a promising technology for future beyond-5G wireless networks, whose fundamental information-theoretic limits are yet to be fully explored. Considering

Design of Incidence Matrices With Limited Constellation Expansion in Massive Connectivity NOMA Systems

This study focused on increasing user supportability and complexity reduction using larger incidence matrices using simple Orthogonal Multi-Arrays and Monte Carlo simulation indicated that the NOMA systems allow higher degrees of freedom and lower complexity than other N OMA schemes while maintaining graceful error rates with a maximum 33% improvement.



A Novel NOMA Design Based on Steiner System

Simulation results on Rayleigh and Additive White Gaussian Noise channels shows that the NOMA technique based on combinatorial structures with balanced incomplete block design outperforms than similar code-domain N OMA techniques with higher overload factor and spectrum efficiency.

Novel Low-Density Signature Structure for Synchronous DS-CDMA Systems

Novel Low-Density Signature (LDS) structure is proposed for synchronous Code Division Multiple Access (CDMA) systems for an uplink communication over AWGN channel. It arranges the system such that

Novel Low-Density Signature for Synchronous CDMA Systems Over AWGN Channel

A near-optimum chip-level iterative soft-in-soft-out (SISO) multiuser decoding (MUD), which is based on message passing algorithm (MPA) technique, is proposed to approximate optimum detection by efficiently exploiting the LDS structure.

Multiple Access with Low-Density Signatures

Simulations results for raw and coded bit-error probability indicate that significant performance gain is achieved over random sequences and that the loss compared to the single-user bound can be kept small.

Signature Design of Sparsely Spread Code Division Multiple Access Based on Superposed Constellation Distance Analysis

A code distance analysis is proposed for SCDMA systems with a finite number of users and spreading lengths and good signature matrices whose factor graphs have very few short cycles and possess large superposed signal constellation distances are designed.

Sparse code multiple access

  • Hosein NikopourHadi Baligh
  • Computer Science, Business
    2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)
  • 2013
A new multiple access scheme so called sparse code multiple access (SCMA) is proposed which still enjoys the low complexity reception technique but with better performance compared to LDS, allowing us to take advantage of a near optimal ML receiver with practically feasible complexity.

A Survey of Non-Orthogonal Multiple Access for 5G

According to signal transmission characteristic, the non-orthogonal multiple access schemes are classified into four categories: scrambling based NOMA, interleaving based N OMA, spreading based NomsA and coding based NomA, where the scheme with superior performance is given.

Power-Imbalanced Low-Density Signatures (LDS) From Eisenstein Numbers

A novel class of LDS is presented which can achieve error rate performances comparable to that of SCMA in Rayleigh fading channels and better performances in Gaussian channels by designing power-imbalanced LDS.

Hybrid DS/FH-CDMA system employing MT-FSK modulation for mobile radio

This paper presents an analytical evaluation of a direct-sequence/frequency-hopped code division multiple access (DS/FH-CDMA) system employing non-coherent multiple tone frequency shift keying

On Receiver Design for Uplink Low Density Signature OFDM (LDS-OFDM)

This paper introduces an effective receiver for the LDS-OFDM scheme, and proposes a framework to analyze and design this iterative receiver using extrinsic information transfer (EXIT) charts, and shows how the turbo MUDD is tuned using EXIT charts analysis.