Analytical Study of QAM With Interference Cancellation for High-Speed Multicode CDMA

Xia, Bin; Wang, Jiangzhou

doi:10.1109/tvt.2005.844656

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…In [249], authors analyzed a pointto-point MIMO system with perfect CSI at transmitter and receiver, and optimized the constellation selection and linear transceiver based on BER. In [250], authors investigated the multicode CDMA systems with interference cancellers to support high data-rate communications and BER of M -ary QAM was obtained. In [251], authors analyzed the performance of rate-adaptive M -ary QAM constellations with orthogonal space time block codes (STBC) and derive the closed-form BER expressions.…”

Section: Spatial Diversitymentioning

confidence: 99%

A Survey on Higher-Order QAM Constellations: Technical Challenges, Recent Advances, and Future Trends

Singya

Shaik

Kumar

et al. 2021

IEEE Open J. Commun. Soc.

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Communication system's performance is sensitive to bandwidth, power, cost etc. There have been various solutions to improve the performance, out of them, one of the fundamental solutions over the years is design of optimum modulation schemes. As the research on beyond 5G heats up, we survey and explore power and bandwidth efficient modulation schemes for the next generation communication systems in details. In the existing literature, initially square quadrature amplitude modulation (SQAM) was considered. However, only square constellations are not sufficient for varying channel conditions and rate requirements, thus, efficient odd power of 2 constellations were introduced. For odd power of 2 constellations, rectangular QAM (RQAM) is most commonly used. However, RQAM is not a good choice and modified cross QAM (XQAM) constellation is preferred which provides improved power efficiency over RQAM due to its energy efficient two dimensional (2D) structure. The increasing demand for high data-rates has further encouraged research towards more compact 2D constellations which leads to hexagonal lattice structure based hexagonal QAM (HQAM) constellations. In this work, various QAM constellations are discussed and detailed study of star QAM, XQAM, and HQAM is presented. Generation, peak and average energies, peak-to-average-power ratio, symbol-error-rate, decision boundaries, bit mapping, Gray code penalty, and bit-error-rate of star QAM, XQAM, and HQAM constellations for different constellation orders are presented. Finally, a comparative study of various QAM constellations is presented which justifies the supremacy of HQAM over other QAM constellations for various wireless communication systems and a potential modulation scheme for future standards.

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Section: Spatial Diversitymentioning

confidence: 99%

A Survey on Higher-Order QAM Constellations: Technical Challenges, Recent Advances, and Future Trends

Singya

Shaik

Kumar

et al. 2021

IEEE Open J. Commun. Soc.

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“…Also, modularity of a system allows easy replacement or progress of subsystems to take advantage of new technologies [16]. In [17], that they discussed the M-QAM for forward link of MC-CDMA schemes with interference dissolution to support high data rate service, and provided an analytical BER performance of the system. In [18], emphasizes the suitability of high level design tools when designing sophisticated systems, and the importance to design FPGA systems rather than ASIC for accomplishing one day the SDR idea and give a high level overview of the FPGA implementation, that work emphasizes the packet detection, synchronization, preamble correlator, channel estimation and equalization; that is primarily at the OFDM receiver for the IEEE802.11.…”

Section: Related Workmentioning

confidence: 99%

Design of Selectable Modems for MC-CDMA Based on Software Defined Radio

Nahar¹,

Rahayu²

2015

IJETS

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MC-CDMA technique is the combination of Orthogonal Frequency Division Multiplexing (OFDM) technique and Code Division Multiple Access (CDMA) technique and collects the benefits of both techniques to provide higher data rates and greater flexibility for voice, data, video and internet services for future wireless systems. In this paper MC-CDMA system based on Software Defined Radio (SDR) was proposed. The proposed data spread model consists of gold code and Selectable six modulation types (BPSK, QPSK, 8QAM, 16QAM, 32QAM and 64QAM). In addition, OFDM is designed by both FFT and IFFT for detecting ideal channel. The programming is done by using MATLABSimulink tool as well as M-files presented for each modem. Matlab 13A. The transmitter send 4, 3 and 2 bit to the receiver in which the system indicate is too big for 4 and 3 bit therefore the transmitted but reduced to two bit for successfully system work. To achieve optimum encoding and decoding signal the all modulation techniques use 5 MHz to 20 MHz spectrum frequency. Moreover the bandpass signal generation has optimal utilized area to satisfy the required sampling rate

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“…OFDM System Block DiagramSource: Carcia and Cumplido[56] Xia and Wang[57] that they discussed the M-QAM modulator for forward link of mulch code-CDMA systems with interference deletion to support high data rate service and provided a logical bit error rate performance of the system. The introduction of analysis of the bit error presentation of the 16-QAM system on Rayleigh fading channels with the highest ratio combining diversity and channel estimate errors by Annarajjala[58].…”

mentioning

confidence: 99%

FPGA Implementation of MC-CDMA Wireless Communication System Based on SDR-A Review

Nahar¹,

Gitaffa²,

Ali³

et al. 2017

Review of Information Engineering and Applications

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Software Defined Radio (SDR) has the flexibility to modify the characteristics of the receiving and transmitting radio device, without physically adjusting the hardware, due to development in the system. Because of the increasing need for wireless communication applications so as to enable consumers to communicate anywhere through information led to the emergence of many communication devices to include the large amount of applications that every one of the devices needs power and thereby increase the total power. This study confirms that the wireless communication system for secured transmit data, fast and inexpensive; can be done by implementing using Partial Reconfiguration (PR) modern technology in FPGA developing based on SDR. The Speed and performance can be improved. The area also can be decreased. The new Xilinx, Vertex Series FPGA, provides the provision of PR. The power consumption can be reduced by applying power reduction techniques in the blocks. The combination of MATLAB (Simulink and M-file) and Simulink HDL Coder offers flexible capabilities for analysis, design; simulation, implementation, and verification. With all these capabilities, in a single system to reduce the time spent tuning for reducing the algorithms and models during rapid prototyping and experimentation and less time on HDL coding. Contribution/ Originality: This study contributes in the existing literature review for implementing MC-CDMA wireless communication system using Partial Reconfiguration (PR) that is a new technology in FPGA. 1. INTRODUCTION The wireless communications revolution started with the mobile phone at the beginning of the 80's and all the improvements which have led to the multiplication of mobile and wireless communications networks and standards [1]. The 1st Generation (1G) of technology was characterized by analog means voice only; 1G quality was too low and also had connections to low speed, but they effectively offered the inherent easiness of mobile communications. The system used in 1G was Frequency Division Multiple Access (FDMA) [2]. The 2nd Generation (2G) of technology is digital in the United States, most of the devices and services were digital. The spread of digital mobile

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Analytical Study of QAM With Interference Cancellation for High-Speed Multicode CDMA

Cited by 10 publications

References 20 publications

A Survey on Higher-Order QAM Constellations: Technical Challenges, Recent Advances, and Future Trends

A Survey on Higher-Order QAM Constellations: Technical Challenges, Recent Advances, and Future Trends

Design of Selectable Modems for MC-CDMA Based on Software Defined Radio

FPGA Implementation of MC-CDMA Wireless Communication System Based on SDR-A Review

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