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Journal articles on the topic 'Π/4 DQPSK'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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1

Wu, Yan Jun, Gang Fu та Peng Yu. "The Application of DFT Technology in Soft Demodulation of π/4-DQPSK Signals". Applied Mechanics and Materials 644-650 (вересень 2014): 4439–42. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4439.

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Presented to the π / 4 differential quaternary phase shift keying signal (π/4-DQPSK) using the discrete Fourier transform (DFT) for software demodulation algorithm in consideration of the actual received waveform into transition to π/4-DQPSK District and stable region, and only the waveform sampling point DFT transform the region stable recovery decision. simulation gives the demodulation method to achieve the same differential demodulation relatively simple structure, and the anti-noise in the signal to noise ratio greater than 3dB better performance than the differential demodulation performance, expected the algorithm is applied π/4-DQPSK software radio receiver design.
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2

Zhu, Hong Li, та Xia Sun. "Design and Realization of π／4-DQPSK Modulation Circuit Based on FPGA". Advanced Materials Research 490-495 (березень 2012): 402–6. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.402.

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Technology of digital modulation plays an important role in digital communication system, the combination of digital communication technology and FPGA is a certain trend. This paper designs and realizes a new π／4-DQPSK modulator based on FPGA. The simulation result provides the correction of the design. With simple solution, high integration and high reliability, this π／4-DQPSK modulator can be widely used in digital communication field.
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3

Li, Guo Quan, Ke Tang, Jin Zhao Lin, et al. "Exploration of Modulation and Demodulation for Body Area Networks." Applied Mechanics and Materials 427-429 (September 2013): 2558–61. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.2558.

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Modulation and demodulation are two important parts in BAN baseband transmission systems. Different demodulation algorithms may affect the BER performance of the entire system seriously. Referring to IEEE 802.15.6 BAN standard, theoretical analysis and algorithm design of the modulation and demodulation for π/2-DBPSK and π/4-DQPSK is carried out and simulation results of BER performance are presented in this paper. In AWGN channel, both modulations achieve good performance, and performance degradation of π/4-DQPSK happens in multipath channel which may not satisfy the requirements. Adaptive modulation is considered to solve this problem by choosing different modulation scheme according to channel quality.
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4

Abu-Dayya, A. A., та N. C. Beaulieu. "Diversity π/4-DQPSK on microcellular interference channels". IEEE Transactions on Communications 44, № 10 (1996): 1289–97. http://dx.doi.org/10.1109/26.539769.

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5

Miller, L. E., та J. S. Lee. "BER expressions for differentially detected π/4 DQPSK modulation". IEEE Transactions on Communications 46, № 1 (1998): 71–81. http://dx.doi.org/10.1109/26.655405.

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6

Kwak, Jaemin. "Implementation of π/4-DQPSK Modem for Maritime Digital Communication in VHF Band". Journal of Korea Navigation Institute 18, № 6 (2014): 541–45. http://dx.doi.org/10.12673/jant.2014.18.6.541.

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7

Mao Yu та K. Feher. "π/4-FQPSK: an efficiency improved, standardized π/4-DQPSK compatible modulation/nonlinearly amplified RF wireless solution". IEEE Transactions on Broadcasting 42, № 2 (1996): 95–101. http://dx.doi.org/10.1109/11.506825.

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8

Kumar, Prashant, та Preetam Kumar. "Performance Evaluation of $$\pi /4$$ π / 4 -DQPSK OFDM over Underwater Acoustic Channels". Wireless Personal Communications 91, № 3 (2016): 1137–52. http://dx.doi.org/10.1007/s11277-016-3517-0.

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9

Jinsoup Joung та G. L. Stuber. "Frequency offset estimation algorithm for π/4-DQPSK TDMA mobile radio". IEEE Transactions on Vehicular Technology 49, № 5 (2000): 1885–92. http://dx.doi.org/10.1109/25.892591.

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10

O’Droma *, M. S., та M. Keaveney. "EVM measurement of modulation fidelity of π/4 DQPSK baseband modulators". International Journal of Electronics 91, № 6 (2004): 377–84. http://dx.doi.org/10.1080/00207210410001712156.

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11

Che-Ho Wei та Wen-Jiang Chen. "Digital tanlock loop for tracking π/4-DQPSK signals in digital cellular radio". IEEE Transactions on Vehicular Technology 43, № 3 (1994): 474–79. http://dx.doi.org/10.1109/25.312808.

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12

Chandra, Aniruddha, та Chayanika Bose. "BER of Differentially Detected π/4-DQPSK with Selection Combining in Nakagami-m Fading". International Journal of Wireless Information Networks 17, № 1-2 (2010): 54–63. http://dx.doi.org/10.1007/s10776-010-0115-z.

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13

Kwak, Jae-Min. "Simulation Study of VHF band π/4-DQPSK Maritime Digital Communication Modem According to ITU-R M.1842-1 Annex1". Journal of Korea Navigation Institute 17, № 6 (2013): 693–99. http://dx.doi.org/10.12673/jkoni.2013.17.6.693.

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14

Kostic, Z. "Low-complexity equalization for π/4 DQPSK signals based on the method of projection onto convex sets". IEEE Transactions on Vehicular Technology 48, № 6 (1999): 1916–22. http://dx.doi.org/10.1109/25.806784.

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15

Peng Tan та N. C. Beaulieu. "Precise BER analysis of π/4-DQPSK OFDM with carrier frequency offset over frequency selective fast fading channels". IEEE Transactions on Wireless Communications 6, № 10 (2007): 3770–80. http://dx.doi.org/10.1109/twc.2007.060127.

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16

Young, T., J. Conradi та W. R. Tinga. "BER characteristics of π/4 DQPSK microwave subcarrier signals on optical fiber using Mach-Zehnder modulator nonlinear upconversion". IEEE Photonics Technology Letters 8, № 11 (1996): 1552–54. http://dx.doi.org/10.1109/68.541580.

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17

Choi, Yoonseok, Hoon Bock Lee, Sung-Bum Park, Bong-Hyun Hong, Sang-Yoon Lee та Kyun Hyon Tchah. "A unified GFSK, π/4-shifted DQPSK, and 8-DPSK baseband controller for enhanced data rate Bluetooth SoC". Current Applied Physics 6, № 5 (2006): 862–72. http://dx.doi.org/10.1016/j.cap.2005.04.048.

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18

Qin, Dong, Yuhao Wang, and Tianqing Zhou. "Average SEP of AF Relaying in Nakagami-m Fading Environments." Wireless Communications and Mobile Computing 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/6581827.

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This paper is devoted to an investigation of an exact average symbol error probability (SEP) for amplify and forward (AF) relaying in independent Nakagami-m fading environments with a nonnegative integer plus one-half m, which covers many actual scenarios, such as one-side Gaussian distribution (m=0.5). Using moment generating function approach, the closed-form SEP is expressed in the form of Lauricella multivariate hypergeometric function. Four modulation modes are considered: rectangular quadrature amplitude modulation (QAM), M-ary phase shift keying (MPSK), M-ary differential phase shift keying (MDPSK), and π/4 differential quaternary phase shift keying (DQPSK). The result is very simple and general for a nonnegative integer plus one-half m, which covers the same range as integer m. The tightness of theoretical analysis is confirmed by computer simulation results.
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19

Hashem, B., та M. S. El-Hennawey. "Performance of the π/4-DQPSK, GMSK, and QAM modulation schemes in mobile radio with multipath fading and nonlinearities". IEEE Transactions on Vehicular Technology 46, № 2 (1997): 390–95. http://dx.doi.org/10.1109/25.580777.

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20

Prabhu, G. S., та P. M. Shankar. "Performance analysis of fiber-fed microcellular networks using π/4-DQPSK in a frequency-selective CCI-limited Nakagami fading environment". IEEE Transactions on Vehicular Technology 51, № 5 (2002): 1258–64. http://dx.doi.org/10.1109/tvt.2002.800620.

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21

Young, T., J. Conradi та W. R. Tinga. "Generation and transmission of FM and π/4 DQPSK signals at microwave frequencies using harmonic generation and optoelectronic mixing in Mach-Zehnder modulators". IEEE Transactions on Microwave Theory and Techniques 44, № 3 (1996): 446–53. http://dx.doi.org/10.1109/22.486154.

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