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Standard-independent I/Q imbalance estimation and compensation scheme inOFDM direct-conversion transceivers None

Fang-lin GU, Shan WANG, Wen-wu WANG

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3,   Pages 388-397 doi: 10.1631/FITEE.1700003

Abstract: Direct-conversion transceivers are gaining increasing attention due to their low power consumption. However, they suffer from a serious in- and quadrature-phase (I/Q) imbalance problem. The I/Q imbalance can severely limit the achievable operating signal-to-noise ratio (SNR) at the receiver and, consequently, the supported constellation sizes and data rates. In this paper, we first investigate the effects of I/Q imbalance on orthogonal frequency division multiplexing (OFDM) receivers, and then propose a new I/Q imbalance compensation scheme. In the proposed method, a new statistic, which is robust against channel distortion, is used to estimate the I/Q imbalance parameters, and then the I/Q imbalance is corrected in the frequency domain. Simulations are performed to verify the effectiveness of the proposed method for I/Q imbalance compensation. The results show that the proposed I/Q imbalance compensation method can achieve bit error rate (BER) performance close to that in the ideal case without I/Q imbalance in additive white Gaussian noise (AWGN) or multipath environments. Furthermore, because no pilot information is required, this method can be applied in various standard communication systems.

Keywords： In- and quadrature-phase (I/Q) imbalance     Orthogonal frequency division multiplexing (OFDM)     Standard-independent    

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The V－BLAST Detection for MIMO MC－CDMA System

Yang Jie,Feng Guangzeng

Strategic Study of CAE 2007, Volume 9, Issue 1,   Pages 58-62

Abstract:

This paper investigates V-BLAST MC-CDMA down link.A V-BLAST detector per subcarrier is proposed for MIMO MC-CDMA system in this paper and the system performance with var ious numbers of V -BLAST antennas and users for such a system is evaluated throu gh simulations.

Keywords： multiple input multiple output(MIMO)     orthogonal frequency division multiplexing(OFDM)     layered space唱time code(LST)     zero force(ZF)algorithm     minimum mean square error(MMSE)    

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An End to End Modulating Transmission Scheme With Good Robustness Against the RPE-LTP Vocoder

Chen Liquan,Hu Aiqun,Xu Qing and Yang Xiaohui

Strategic Study of CAE 2007, Volume 9, Issue 12,   Pages 81-85

Abstract:

A novel endtoend data transmission scheme based on OFDM mechanism with good robustness against the RPE-LTP vocoder in GSM voice channel is proposed. According to the character of RPE-LTP vocoder, data are modulated to orthogonal lowfrequency sinusoidal carrier. In OFDM, the modulation is done by IFFT and the modulated signals are conformed to the time and frequency characters of RPELTP vocoder. The results of simulation show that the transmission bit rate of the proposed scheme reaches 2.4 kb/s，and the bit error rate of the scheme is lower than 0.3 %. This scheme provides a new approach for realtime secure voice data transmission over GSM system.

Keywords： vocoder     regular pulse excitedlong term prediction     OFDM     FFT    

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A novel method for PAPR reduction of the OFDM signal using nonlinear scaling and FM Regular Article

Yi-hu Xu, Jung-Yeol Oh, Zhen-hao Sun, Myoung-Seob Lim,xuyh@ybu.edu.cn,mslim@jbnu.ac.kr

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 11,   Pages 1587-1594 doi: 10.1631/FITEE.1800438

Abstract: (OFDM) has been adopted as standard beginning with the 4 generation mobile communication system because of its high-bit-rate transmission capability under frequency selective fading channel conditions. However, a major disadvantage of OFDM is the non-constant envelope signal with a high (PAPR). The high peak signal in OFDM is distorted through a nonlinear amplifier, which causes bit error ratio (BER) reduction. Many techniques have been developed for reducing PAPR at the cost of inefficient bandwidth usage or throughput because of the additional information about PAPR reduction. We propose a novel method, in which the high peak signal above the threshold of the nonlinear amplification region is nonlinearly downscaled to lower the PAPR. The time slot location and scaling ratio for where and how the high peak baseband OFDM signal is downscaled are transmitted using (FM) combined with OFDM, which requires less additional bandwidth than the previously proposed methods. Simulation results show that the proposed novel method provides a lower PAPR and elicits a better BER performance compared with other conventional methods, because it reduces the PAPR by and restores the pre-distorted signal using FM.

Keywords： 正交频分复用；峰均比；非线性缩放；调频技术    

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A novel energy-efficient ICI cancellation technique for bandwidth improvements through cyclic prefix reuse in an OFDM system Article

Sandeep SAROWA, Harmanjeet SINGH, Sunil AGRAWAL, B. S. SOHI

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 11,   Pages 1892-1899 doi: 10.1631/FITEE.1601333

Abstract: Orthogonal frequency division multiplexing (OFDM), a very promising technique that is leading the evolution in wireless mobile communication to sideline the bandwidth scarcity issue in spectrum allocation, is severely affected by the undesirable effects of the frequency offset error, which generates inter carrier interference (ICI) due to the Doppler shift and local oscillator frequency synchronization errors. There are many ICI cancellation techniques available in the literature, such as self-cancellation (SC), maximum likelihood estimation (MLE), and windowing, but they present a tradeoff between bandwidth redundancy and system complexity. In this study, a new energy-efficient, bandwidth-effective technique is proposed to mitigate ICI through cyclic prefix (CP) reuse at the receiver end. Unlike SC and MLE where the whole OFDM symbol data is transmitted in duplicate to create redundancy at the transmitter end, the proposed technique uses the CP data (which is only 20% of the total symbol bandwidth) to estimate the channel, and it produces similar results with a huge bandwidth saving. The simulation results show that the proposed technique has a significant improvement in error performance, and a comparative analysis demonstrates the substantial improvement in energy efficiency with high bandwidth gain. Therefore, it outperforms the legacy ICI cancellation schemes under consideration.

Keywords： Orthogonal frequency division multiplexing (OFDM)     Fast Fourier transform (FFT)     Cyclic prefix (CP)     Inter symbol interference (ISI)     Inter carrier interference (ICI)     Maximum likelihood estimation (MLE)    

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Compressed sensing-based structured joint channel estimation in a multi-user massive MIMO system Article

Ruo-yu ZHANG, Hong-lin ZHAO, Shao-bo JIA

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12,   Pages 2082-2100 doi: 10.1631/FITEE.1601635

Abstract: Acquisition of accurate channel state information (CSI) at transmitters results in a huge pilot overhead in massive multiple input multiple output (MIMO) systems due to the large number of antennas in the base station (BS). To reduce the overwhelming pilot overhead in such systems, a structured joint channel estimation scheme employing compressed sensing (CS) theory is proposed. Specifically, the channel sparsity in the angular domain due to the practical scattering environment is analyzed, where common sparsity and individual sparsity structures among geographically neighboring users exist in multi-user massive MIMO systems. Then, by equipping each user with multiple antennas, the pilot overhead can be alleviated in the framework of CS and the channel estimation quality can be improved. Moreover, a structured joint matching pursuit (SJMP) algorithm at the BS is proposed to jointly estimate the channel of users with reduced pilot overhead. Furthermore, the probability upper bound of common support recovery and the upper bound of channel estimation quality using the proposed SJMP algorithm are derived. Simulation results demonstrate that the proposed SJMP algorithm can achieve a higher system performance than those of existing algorithms in terms of pilot overhead and achievable rate.

Keywords： Compressed sensing     Multi-user massive multiple input multiple output (MIMO)     Frequency-division duplexing     Structured joint channel estimation     Pilot overhead reduction    

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Non-ideal space division multiple access and its application None

Ji-ying XIANG

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3,   Pages 357-366 doi: 10.1631/FITEE.1700827

Abstract: We study the performance of space division multiple access (SDMA) under a non-ideal engineering situation. When the SDMA channel is of high inter-layer correlation and the condition number is large, the multiple user multiple input and multiple output user equipment (MUMIMOUE) grouping should be optimized, and in some cases further dimension-reduction should be applied. As the channel measuring is always non-ideal, we use two methods, feedback mode and non-feedback mode, in terms of performance and overhead. It is proposed that the non-feedback mode is preferable even for some non-reciprocal channels. Principle analysis and test results are given.

Keywords： Fifth generation (5G)     Condition number     Channel reciprocity     Feedback mode     Non-feedback mode    

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Zero ground clearance dual antenna pair for metal-cased fifth-generation multiple input multiple output smartphone Correspondence

Le CHANG, Wenbao HE, Xiaomin CHEN, Xiaoxue TAN, Juan CHEN, Kai KANG, Yang YANG

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 10,   Pages 1562-1567 doi: 10.1631/FITEE.2200119

Abstract:

The fifth-generation (5G) era has already arrived and many applications are prospering. The multiple input multiple output (MIMO) system is the key to enhancing channel capacity for both the fourthgeneration (4G) wireless communication and 5G systems. For a smartphone, the most challenging task for antenna engineers is to accommodate the numerous 4G and 5G multi-port antennas while avoiding mutual coupling problems (Li Y et al., 2009, 2012; Hong, 2017; Sharawi et al., 2017). Therefore, implementing multiple antennas within a small space is a worthwhile topic to study, especially for antennas operating at the same frequency.

Keywords： 天线对；第五代移动通信技术（5G）；Sub-6 GHz；极化正交；智能终端；智能手机；零净空；全金属外壳；多输入多输出（MIMO）    

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Ten-channel mode-division-multiplexed silicon photonic integrated circuit with sharp bends Special Feature on Optoelectronic Devices and Inte

Chen-lei LI, Xiao-hui JIANG, Yung HSU, Guan-hong CHEN, Chi-wai CHOW, Dao-xin DAI

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 4,   Pages 498-506 doi: 10.1631/FITEE.1800386

Abstract:

A multimode silicon photonic integrated circuit (PIC) comprising a pair of on-chip mode (de)multiplexers with 10-mode channels and a multimode bus waveguide with sharp bends is demonstrated to enable multi-channel on-chip transmissions. The core width of the multimode bus waveguide is chosen such that it can support 10 guided modes, of which there are four transverse-magnetic polarization modes and six transverse-electric polarization modes. This multimode bus waveguide comprises sharp bends based on modified Euler curves. Experimental results demonstrate that the present silicon PIC enables the 10-channel on-chip transmission with a low inter-mode crosstalk of approximately −20 dB over a broad bandwidth of 1520–1610 nm even when the bending radius of the S-bend is as small as 40 μm. Compared with a silicon PIC using a conventional arc-bend with the same bending radius, our proposed PIC demonstrates a significant improvement.

Keywords： Silicon     Multimode     Waveguide     Euler-bends    

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OTFS modulation performance in a satellite-to-ground channel at sub-6-GHz and millimeter-wave bands with high mobility

Tianshi Li, Ruisi He, Bo Ai, Mi Yang, Zhangdui Zhong, Haoxiang Zhang,19125026@bjtu.edu.cn,ruisi.he@bjtu.edu.cn,boai@bjtu.edu.cn,17111030@bjtu.edu.cn,zhdzhong@bjtu.edu.cn,zhx61778294@126.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 517-526 doi: 10.1631/FITEE.2000468

Abstract: modulation has been widely considered for high-mobility scenarios. have recently received much attention as a typical high-mobility scenario and face great challenges due to the high Doppler shift. To enable reliable communications and high spectral efficiency in satellite mobile communications, we evaluate OTFS modulation performance for geostationary Earth orbit and low Earth orbit satellite-to-ground channels at sub-6-GHz and millimeter-wave bands in both line-of-sight and non-line-of-sight cases. The is used to improve the bit error rate performance. The adaptability of OTFS and the signal detection technologies in satellite-to-ground channels are analyzed. Simulation results confirm the feasibility of applying OTFS modulation to with high mobility. Because full diversity in the delay-Doppler domain can be explored, different terminal movement velocities do not have a significant impact on the performance of OTFS modulation, and OTFS modulation can achieve better performance compared with classical orthogonal frequency division multiplexing in satellite-to-ground channels. It is found that MMSE-SD can improve the performance of OTFS modulation compared with an MMSE equalizer.

Keywords： 时延-多普勒域；高移动性通信；最小均方误差算法；正交时频空；星地通信；毫米波通信    

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Research on the Forecast of the BP Neural Network Based on the Orthogonal Test

Cai Anhui,Liu Yonggang,Sun Guoxiong

Strategic Study of CAE 2003, Volume 5, Issue 7,   Pages 67-71

Abstract:

The strategy for forecasting the BP neural network was researched on the basis of the training-studying samples that were obtained in the orthogonal test of L9（34). The self-contained orthogonal sample was the basic training and studying cell. When others samples were added into the self-contained orthogonal samples or the self-contained orthogonal samples were cut down, the forecasting results were completely irresponsible. On the same test condition and orthogonal test type, the self-contained orthogonal sample with large information content could forecast that with small information content at high precision. A new test-design approach was put forward. Namely, the self-contained orthogonal sample was obtained through the orthogonal test, and then, the values of all other samples whose factors were the same as that of the self-contained orthogonal sample could be forecast in the BP neural network and its precision was considerable high. Therefore, the time and labors were enormously saved.

Keywords： BP neural network     orthogonal test     strategy     design-test approach     sample collection    

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Study on the Oscillation of a Uniform Cylinder in Front of Two Vertical Walls Intersecting Normally

Ning Dezhi,Teng Bin

Strategic Study of CAE 2003, Volume 5, Issue 5,   Pages 84-91

Abstract:

Based on the image theory, the oscillation of a cylinder in front of two vertical walls intersecting normally in the otherwise static water is transformed into the oscillating problem of four symmetrically arranged cylinders. The transformed problem is solved by an analytical method based on eigenfunction expansion. Numerical experiment has been performed in order to examine the influence of the distances between the cylinder and the walls and water depth on the added mass and radiation damping of the cylinder. The calculation shows that the added mass and radiation damping of the cylinder in front of the two vertical walls increase abruptly. The added mass and radiation damping oscillate with wave number, and the oscillating frequency increases with the increase of the distances between the cylinder and the walls. Furthermore, the added masses and radiation damping are linear with the water depth in the range of low frequencies.

Keywords： added mass     radiation damping     image theory     vertical wall     cylinder    

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Embracing non-orthogonalmultiple access in future wireless networks None

Zhi-guo DING, Mai XU, Yan CHEN, Mu-gen PENG, H. Vincent POOR

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3,   Pages 322-339 doi: 10.1631/FITEE.1800051

Abstract: This paper provides a comprehensive survey of the impact of the emerging communication technique, non-orthogonal multiple access (NOMA), on future wireless networks. Particularly, how the NOMA principle affects the design of the generation multiple access techniques is introduced first. Then the applications of NOMA to other advanced communication techniques, such as wireless caching, multiple-input multiple-output techniques, millimeter-wave communications, and cooperative relaying, are discussed. The impact of NOMA on communication systems beyond cellular networks is also illustrated, through the examples of digital TV, satellite communications, vehicular networks, and visible light communications. Finally, the study is concluded with a discussion of important research challenges and promising future directions in NOMA.

Keywords： Non-orthogonal multiple access (NOMA)     Wireless caching     Multiple-input multiple-output (MIMO) NOMA     Cooperative NOMA     Millimeter-wave networks     Visible light communications (VLC)    

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High efficiency spreading spectrum modulation based on double orthogonal complex sequences

Shi Xiaohong

Strategic Study of CAE 2012, Volume 14, Issue 3,   Pages 108-112

Abstract:

This paper presents a kind of high efficiency spreading spectrum modulation scheme using double orthogonal complex sequences (DoCS). In this scheme, input data bit-stream is split into many groups with length M. Each group is then mapped into a word of width M and then utilized to select one sequence from 2M-2 DoCS sequences each with length L. After that, the selected sequence is modulated on carrier in QPSK(quadrature phase shift keying) mode. In addition, a novel method named forward phase correction (FPC) is put forward for carrier recovery.

Keywords： modulation and demodulation     high efficiency spreading spectrum modulation     forward phase correction     double orthogonal complex sequences    

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Multiple-antenna techniques in nonorthogonalmultiple access: a review Regular Papers

Fei-yan TIAN, Xiao-ming CHEN

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 12,   Pages 1665-1697 doi: 10.1631/FITEE.1900405

Abstract: As a promising physical layer technique, nonorthogonal multiple access (NOMA) can admit multiple users over the same space-time resource block, and thus improve the spectral efficiency and increase the number of access users. Specifically, NOMA provides a feasible solution to massive Internet of Things (IoT) in 5G and beyond-5G wireless networks over a limited radio spectrum. However, severe co-channel interference and high implementation complexity hinder its application in practical systems. To solve these problems, multiple-antenna techniques have been widely used in NOMA systems by exploiting the benefits of spatial degrees of freedom. This study provides a comprehensive review of various multiple-antenna techniques in NOMA systems, with an emphasis on spatial interference cancellation and complexity reduction. In particular, we provide a detailed investigation on multiple-antenna techniques in two-user, multiuser, massive connectivity, and heterogeneous NOMA systems. Finally, future research directions and challenges are identified.

Keywords： Nonorthogonal multiple access     Multiple-antenna technique     B5G     Internet of Things    

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Title Author Date Type Operation

Standard-independent I/Q imbalance estimation and compensation scheme inOFDM direct-conversion transceivers

Fang-lin GU, Shan WANG, Wen-wu WANG

Journal Article

The V－BLAST Detection for MIMO MC－CDMA System

Yang Jie,Feng Guangzeng

Journal Article

An End to End Modulating Transmission Scheme With Good Robustness Against the RPE-LTP Vocoder

Chen Liquan,Hu Aiqun,Xu Qing and Yang Xiaohui

Journal Article

A novel method for PAPR reduction of the OFDM signal using nonlinear scaling and FM

Yi-hu Xu, Jung-Yeol Oh, Zhen-hao Sun, Myoung-Seob Lim,xuyh@ybu.edu.cn,mslim@jbnu.ac.kr

Journal Article

A novel energy-efficient ICI cancellation technique for bandwidth improvements through cyclic prefix reuse in an OFDM system

Sandeep SAROWA, Harmanjeet SINGH, Sunil AGRAWAL, B. S. SOHI

Journal Article

Compressed sensing-based structured joint channel estimation in a multi-user massive MIMO system

Ruo-yu ZHANG, Hong-lin ZHAO, Shao-bo JIA

Journal Article

Non-ideal space division multiple access and its application

Ji-ying XIANG

Journal Article

Zero ground clearance dual antenna pair for metal-cased fifth-generation multiple input multiple output smartphone

Le CHANG, Wenbao HE, Xiaomin CHEN, Xiaoxue TAN, Juan CHEN, Kai KANG, Yang YANG

Journal Article

Ten-channel mode-division-multiplexed silicon photonic integrated circuit with sharp bends

Chen-lei LI, Xiao-hui JIANG, Yung HSU, Guan-hong CHEN, Chi-wai CHOW, Dao-xin DAI

Journal Article

OTFS modulation performance in a satellite-to-ground channel at sub-6-GHz and millimeter-wave bands with high mobility

Tianshi Li, Ruisi He, Bo Ai, Mi Yang, Zhangdui Zhong, Haoxiang Zhang,19125026@bjtu.edu.cn,ruisi.he@bjtu.edu.cn,boai@bjtu.edu.cn,17111030@bjtu.edu.cn,zhdzhong@bjtu.edu.cn,zhx61778294@126.com

Journal Article

Research on the Forecast of the BP Neural Network Based on the Orthogonal Test

Cai Anhui,Liu Yonggang,Sun Guoxiong

Journal Article

Study on the Oscillation of a Uniform Cylinder in Front of Two Vertical Walls Intersecting Normally

Ning Dezhi,Teng Bin

Journal Article

Embracing non-orthogonalmultiple access in future wireless networks

Zhi-guo DING, Mai XU, Yan CHEN, Mu-gen PENG, H. Vincent POOR

Journal Article

High efficiency spreading spectrum modulation based on double orthogonal complex sequences

Shi Xiaohong

Journal Article

Multiple-antenna techniques in nonorthogonalmultiple access: a review

Fei-yan TIAN, Xiao-ming CHEN

Journal Article