CDMA-MIMO Radar With the Tansec Waveform

Solodky, Gaston; Longman, Oren; Villeval, Shahar; Bilik, Igal

doi:10.1109/taes.2020.3016876

Cited by 17 publications

(5 citation statements)

References 21 publications

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“…The proposed generalized QML method is able adequately reconstruct nonlinear frequency modulation embedded in the waveform. It can be further improved by developing another IF model, e.g., the tansec one described in [ 47 ]. There are couple of other prominent estimation methods, such extended generalized chirp transform (EGCT).…”

Section: Discussionmentioning

confidence: 99%

Estimating the Instantaneous Frequency of Linear and Nonlinear Frequency Modulated Radar Signals—A Comparative Study

Milczarek

Lesnik

Djurović

et al. 2021

Sensors

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Automatic modulation recognition plays a vital role in electronic warfare. Modern electronic intelligence and electronic support measures systems are able to automatically distinguish the modulation type of an intercepted radar signal by means of real-time intra-pulse analysis. This extra information can facilitate deinterleaving process as well as be utilized in early warning systems or give better insight into the performance of hostile radars. Existing modulation recognition algorithms usually extract signal features from one of the rudimentary waveform characteristics, namely instantaneous frequency (IF). Currently, there are a small number of studies concerning IF estimation methods, specifically for radar signals, whereas estimator accuracy may adversely affect the performance of the whole classification process. In this paper, five popular methods of evaluating the IF–law of frequency modulated radar signals are compared. The considered algorithms incorporate the two most prevalent estimation techniques, i.e., phase finite differences and time-frequency representations. The novel approach based on the generalized quasi-maximum likelihood (QML) method is also proposed. The results of simulation experiments show that the proposed QML estimator is significantly more accurate than the other considered techniques. Furthermore, for the first time in the publicly available literature, multipath influence on IF estimates has been investigated.

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Section: Discussionmentioning

confidence: 99%

Estimating the Instantaneous Frequency of Linear and Nonlinear Frequency Modulated Radar Signals—A Comparative Study

Milczarek

Lesnik

Djurović

et al. 2021

Sensors

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“…The performance of this system in shadow fading gets improved by this algorithm. Solodky et al [17] proposed a single intra coding scheme for CDMA over automotive MIMO RADAR using the TanSec Frequency Modulation (TSFM) and found by simulation that Frequency-based TSFM outperforms other coding families for crosscorrelation properties. Ravaika et al [18] implemented OFDM over MIMO and equalizer using LMS algorithm to counteract effects due to fading and interference.…”

Section: -Literature Surveymentioning

confidence: 99%

Cancellation Techniques for Co-channel Interference in MIMO-OFDM Systems and Evaluating Their Performance

Rajesh

Rajak

2021

Emerg Sci J

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In a wireless communication system, the transmitted signal is exposed to various surfaces where it bounces and results in several delayed versions of the same signal at the receiver end. The delayed signals are in the form of electromagnetic waves that are diffracted and reflected from the various object surfaces. These result in co-channel interferences for wireless systems. MIMO has proven to be a striking solution for the new generation of wireless systems. MIMO-OFDM system with QPSK modulation is considered as the wireless system for studying the performance of interference cancellation techniques. The BER performance is studied in channels such as Rayleigh and Rician Fading Channels. The effects of interference are reduced to a certain extent by the inclusion of CDMA (spread spectrum technique) as Technique 1. The effects of interference on this system have been further reduced using the LMS filter as Technique 2. Hence, to show better performance in MIMO-OFDM systems, it is recommended to employ both CDMA and LMS filters to decrease the effects of co-channel interference. It is observed that the parameter BER reduces as the SNR increases for both these channels. Doi: 10.28991/esj-2021-01313 Full Text: PDF

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“…In order to be able to separate the MIMO channels at the receiver side, the channels need to be separated at the receiver side and hence various different transmission methods have been proposed. The main waveform transmission methods are Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA) 3 and Code Division Multiple Access (CDMA) 4 . Among them, TDMA achieves orthogonality by transmitting signals through the transmitting antenna in time division and is able to separate the channels through the time dimension at the receiving side.…”

Section: Introductionmentioning

confidence: 99%

An improved target demodulation method based on DDMA-MIMO millimeter wave radar

Wang,

Zhou

2024

Fifteenth International Conference on Signal Processing Systems (ICSPS 2023)

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High-Performance Automotive Millimeter-Wave Radar usually uses Doppler Division Multiple Access (DDMA) to build virtual MIMO arrays. However, the DDMA approach leads to blurring of the radar velocity interval and severe antenna interference problems. In this paper, we analyze these two problems in the DDMA mode, and also propose an improved DDMA target demodulation method, which can efficiently identify the interference target and correctly estimate the velocity of the interference target by means of differentiating the Empty-band of two adjacent frames. Simulation experiments show that this method can effectively solve the interference problems arising from Empty-band demodulation, and has certain practical significance.

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CDMA-MIMO Radar With the Tansec Waveform

Cited by 17 publications

References 21 publications

Estimating the Instantaneous Frequency of Linear and Nonlinear Frequency Modulated Radar Signals—A Comparative Study

Estimating the Instantaneous Frequency of Linear and Nonlinear Frequency Modulated Radar Signals—A Comparative Study

Cancellation Techniques for Co-channel Interference in MIMO-OFDM Systems and Evaluating Their Performance

An improved target demodulation method based on DDMA-MIMO millimeter wave radar

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