Bio‐inspired hybrid algorithm to optimize pilot tone positions in polar‐code‐based orthogonal frequency‐division multiplexing–interleave division multiple access system

2020 ◽  
Vol 34 (3) ◽  
Author(s):  
Hemlata Marne ◽  
Prachi Mukherji ◽  
Makarand Jadhav ◽  
Sachin Paranjape
Keyword(s):  
Hybrid Algorithm ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Polar Code ◽  
Access System ◽  
Multiple Access System

scholarly journals An energy-efficient and elastic optical multiple access system based on coherent interleaved frequency division multiple access

2013 ◽  
Vol 21 (10) ◽  
pp. 12282 ◽  
Author(s):  
Yuki Yoshida ◽  
Akihiro Maruta ◽  
Kenji Ishii ◽  
Yuji Akiyama ◽  
Tsuyoshi Yoshida ◽  
...  
Keyword(s):  
Energy Efficient ◽  
Multiple Access ◽  
Frequency Division ◽  
Access System ◽  
Multiple Access System

Orthogonal Frequency Division Multiplexing and Code Division Multiple Access Systems

2021 ◽  
pp. 386-426
Author(s):  
Stevan Berber
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Intermediate Frequency ◽  
Frequency Division ◽  
Access Technology ◽  
Multicarrier Communication ◽  
Access System ◽  
Non Binary Code ◽  
Code Division Multiple ◽  
Multiple Access System

Chapter 8 presents modern multi-user and multicarrier communication systems based on code division multiple access technology and orthogonal frequency division multiple access technology. Analogue, digital, and discrete orthogonal frequency division multiple access systems are presented separately and then inter-related from theoretical and practical points of view. A precise mathematical model of discrete baseband and intermediate-frequency blocks is presented, including procedures for signal mapping and the discrete Fourier transform, and then related to the model of an analogue radiofrequency block to make the whole orthogonal frequency division multiple access system. The basic theory of binary and non-binary code division multiple access systems operation is presented. To support deeper theoretical understanding of the design and operation of a code division multiple access system, one project in the supplementary material demonstrates the mathematical modelling, simulation, and design of this system in field-programmable gate array technology and presents the development tools required.

Uplink single-carrier frequency division multiple access system with joint equalisation and carrier frequency offsets compensation

2011 ◽  
Vol 5 (4) ◽  
pp. 425-433 ◽  
Author(s):  
F.S. Al-kamali ◽  
M.I. Dessouky ◽  
F. Shawki ◽  
B.M. Sallam ◽  
F.E. Abd El-Samie
Keyword(s):  
Carrier Frequency ◽  
Multiple Access ◽  
Frequency Division ◽  
Access System ◽  
Single Carrier ◽  
Carrier Frequency Offsets ◽  
Frequency Offsets ◽  
Multiple Access System

scholarly journals Sparse code multiple access on the generalized frequency division multiplexing

2020 ◽  
Vol 2020 (1) ◽  
Author(s):  
Guilherme P. Aquino ◽  
Luciano L. Mendes
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Multiple Access ◽  
Physical Layer ◽  
Spectrum Efficiency ◽  
Sparse Code ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Time Frequency ◽  
Performance Loss

Abstract Recent advances in the communication systems culminated in a new class of multiple access schemes, named non-orthogonal multiple access (NOMA), where the main goal is to increase the spectrum efficiency by overlapping data from different users in a single time-frequency resource used by the physical layer. NOMA receivers can resolve the interference among data symbols from different users, increasing the overall system spectrum efficiency without introducing symbol error rate (SER) performance loss, which makes this class of multiple access techniques interesting for future mobile communication systems. This paper analyzes one promising NOMA technique, called sparse code multiple access (SCMA), where C users can share U<C time-frequency resources from the physical layer. Initially, the SCMA and orthogonal frequency division multiplexing (OFDM) integration is considered, defining a benchmark for the overall SER performance for the multiple access technique. Furthermore, this paper proposes the SCMA and generalized frequency division multiplexing (GFDM) integration. Since GFDM is a highly flexible non-orthogonal waveform that can mimic several other waveforms as corner cases, it is an interesting candidate for future wireless communication systems. This paper proposes two approaches for combining SCMA and GFDM. The first one combines a soft equalizer, called block expectation propagation (BEP), and a multi-user detection (MUD) scheme based on the sum-product algorithm (SPA). This approach achieves the best SER performance, but with the significant increment of the complexity at the receiver. In the second approach, BEP is integrated with a simplified MUD, which is an original contribution of this paper, aiming for reducing the receiver’s complexity at the cost of SER performance loss. The solutions proposed in this paper show that SCMA-GFDM can be an interesting solution for future mobile networks.

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