A Reduced Complexity Equalizer for OQPSK

Raphaeli, D.

doi:10.1109/tcomm.2010.01.0801922

Cited by 8 publications

(5 citation statements)

References 16 publications

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“…Out of all, some of the efficient techniques are minimum shift keying (MSK) and GMSK. They are derived from the constantphase frequency shift keying (CPFSK) family of modulation operating at a constant envelope [1,2]. As a modulated signal has the characteristic of constant amplitude, the power utilization will be low by using a class CRF amplifier.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of optimized CORDIC based GMSK system on FPGA platform

Kajur

Prasad²

2020

IJECE

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The Gaussian minimum shift keying (GMSK) is one of the best suited digital modulation schemes in the global system for mobile communication (GSM) because of its constant envelop and spectral efficiency characteristics. Most of the conventional GMSK approaches failed to balance the digital modulation with efficient usage of spectrum. In this article, the hardware architecture of the optimized CORDIC-based GMSK system is designed, which includes GMSK Modulation with the channel and GMSK Demodulation. The modulation consists of non-return zero (NRZ) encoder, an integrator followed by Gaussian filtering and frequency modulation (FM). The GMSK demodulation consists of FM demodulator, followed by differentiation and NRZ decoder. The FM Modulation and demodulation use the optimized CORDIC model for an In-phase (I) and quadrature (Q) phase generation. The optimized CORDIC is designed by using quadrant mapping and pipelined structure to improve the hardware and computational complexity in GMSK systems. The GMSK system is designed on the Xilinx platform and implemented on Artix-7 and Spartan-3EFPGA. The hardware constraints like area, power, and timing utilization are summarized. The comparison of the optimized CORDIC model with similar CORDIC approaches is tabulated with improvements.

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Section: Introductionmentioning

confidence: 99%

Design and analysis of optimized CORDIC based GMSK system on FPGA platform

Kajur

Prasad²

2020

IJECE

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“…As a consequence, an OQPSK signal shows a maximum envelope change of 3 dB (70%) compared to the 100% change for QPSK. Practically, an OQPSK modulated signal has many advantages over QPSK because of its simplified power amplifier design . The OQPSK modulation scheme is commonly used in high‐speed wireless data transmission systems, especially terrestrial mobile communication systems, wideband satellite communication systems, digital video broadcasting systems, and various other systems .…”

Section: Introductionmentioning

confidence: 99%

Blind symbol timing offset estimation for offset‐QPSK modulated signals

Kumar

Majhi

2019

ETRI Journal

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In this paper, a blind symbol timing offset (STO) estimation method is proposed for offset quadrature phase‐shift keying (OQPSK) modulated signals, which also works for other linearly modulated signals (LMS) such as binary‐PSK, QPSK, π/4‐QPSK, and minimum‐shift keying. There are various methods available for blind STO estimation of LMS; however, none work in the case of OQPSK modulated signals. The popular cyclic correlation method fails to estimate STO for OQPSK signals, as the offset present between the in‐phase (I) and quadrature (Q) components causes the cyclic peak to disappear at the symbol rate frequency. In the proposed method, a set of close and approximate offsets is used to compensate the offset between the I and Q components of the received OQPSK signal. The STO in the time domain is represented as a phase in the cyclic frequency domain. The STO is therefore calculated by obtaining the phase of the cyclic peak at the symbol rate frequency. The method is validated through extensive theoretical study, simulation, and testbed implementation. The proposed estimation method exhibits robust performance in the presence of unknown carrier phase offset and frequency offset.

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“…In this context, the purpose of this paper is to propose an enhanced generic SAIC/MAIC technique for links using QR modulations, corrupted by QR CCI. Most of the available WL receivers [6][7][8], [12][13][14], [16][17][18][19][20][21], optimized for QR signals, implement a Time Invariant (TI) WL filter on the extended derotated observation vector and only exploit partly the noncircularity and the cyclostationarity properties of QR signals.…”

Section: Introductionmentioning

confidence: 99%

Quasi-rectilinear (MSK, GMSK, OQAM) co-channel interference mitigation by three inputs widely linear fresh filtering

Chevalier¹,

Chauvat²,

Delmas³

2015

2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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Widely linear (WL) filters have the capability to perform single antenna interference cancellation (SAIC) of one rectilinear or quasi-rectilinear (QR) co-channel interference (CCI). The SAIC technology for QR signals is operational in GSM handsets but requires enhancements for both VA-MOS standard, an evolution of GSM/EDGE standard, and FBMC-OQAM networks, which are candidate for 5G mobile networks. In this context, we propose and analyze in this paper, for QR signals, a SAIC/MAIC enhancement based on the concept of three inputs WL FRESH filtering, exploiting almost exhaustively both the non-circularity and the cyclostationnarity of QR signals, contrary to classical approaches which only exploit very partly these properties.

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A Reduced Complexity Equalizer for OQPSK

Cited by 8 publications

References 16 publications

Design and analysis of optimized CORDIC based GMSK system on FPGA platform

Design and analysis of optimized CORDIC based GMSK system on FPGA platform

Blind symbol timing offset estimation for offset‐QPSK modulated signals

Quasi-rectilinear (MSK, GMSK, OQAM) co-channel interference mitigation by three inputs widely linear fresh filtering

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