Design of Software-Defined Radio Channel Simulator for Wireless Communications: Case Study With DSRC and UWB Channels

Mar, Jeich; Kuo, Chi-Cheng; Lin, Yu Chang; Lung, Ti-Han

doi:10.1109/tim.2009.2016294

Cited by 21 publications

(12 citation statements)

References 13 publications

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“…Figure 2(b) shows the BER performance of OFDM transceiver using 64-QAM. For demonstration we have chosen 120 km/hr and 200 km/hr; performance for high speed, that is, 200 km/hr, seems to degrade than the performance for system with less speed, that is, 120 km/hr, because at higher speed the channel behaves as a fast fading channel and for slower speed channel behaves as a slow fading channel [8]. The test results show that the BER performance of the OFDM transceiver in the high-speed time-varying fading channel will be reduced to less than 10 −5 at the minimum SNR of 12 dB for 16-QAM and 28 dB for 64-QAM at 120 Km/hr.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The 2 × 2 SFBC-OFDM system and a six-path fading channel model are considered as an example of the MIMO-OFDM system in the simulations to prove that the acceptable bit error rate (BER) can be achieved by employing 16-QAM and 64-QAM modulations in time-varying fast fading channels. We consider the vehicle speed of 200 km/h, resulting in the Doppler frequency of 1093 Hz to satisfy the fast fading condition for MIMO-OFDM channel [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Improved Pilot-Aided Channel Estimation for MIMO-OFDM Fading Channels

Mar

Kuo

Basnet

2013

International Journal of Antennas and Propagation

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An improved pilot-aided channel estimation scheme is proposed to enhance the channel estimation accuracy of multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM) fading channels. Based on the adaptive path number selection mechanism, the number of paths can be scalable and adaptively changed with the characteristics of MIMO-OFDM fading channels. The fine channel estimation formulas for all data subcarriers are derived. The 2 × 2 space-frequency block code-OFDM (SFBC-OFDM) system and a six-path fading channel model are considered as an example of the high mobility MIMO-OFDM wireless communications system. Through simulations it is shown that 2 × 2 SFBC-OFDM system using the proposed approach can satisfy the performance requirements over frequency selective and frequency nonselective fast fading channels.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved Pilot-Aided Channel Estimation for MIMO-OFDM Fading Channels

Mar

Kuo

Basnet

2013

International Journal of Antennas and Propagation

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“…Therefore, if the number of users in a given cell of a mobile wireless system is less than the maximum number of array branches, the SDR DBF only needs to operate in the parts of the array branches in order to save the energy. If the processing time of the SDR DBF is longer than the channel coherent time of a mobile wireless system, we can decrease the processing time to meet the flat fading channel operation condition [19] by either reducing the array branches of the SDR DBF or using the parallel processing if the double gate counts are available in FPGA. Previous SDR implementation without MFMO circuit modules such as [8] cannot scalably adapt its hardware configuration to the changing number of antenna branches to save the energy.…”

Section: Methodsmentioning

confidence: 99%

Hierarchical MFMO Circuit Modules for an Energy-Efficient SDR DBF

Mar

Kuo

et al. 2012

IEICE Trans. Inf. & Syst.

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SUMMARYThe hierarchical multi-function matrix operation (MFMO) circuit modules are designed using coordinate rotations digital computer (CORDIC) algorithm for realizing the intensive computation of matrix operations. The paper emphasizes that the designed hierarchical MFMO circuit modules can be used to develop a power-efficient software-defined radio (SDR) digital beamformer (DBF). The formulas of the processing time for the scalable MFMO circuit modules implemented in field programmable gate array (FPGA) are derived to allocate the proper logic resources for the hardware reconfiguration. The hierarchical MFMO circuit modules are scalable to the changing number of array branches employed for the SDR DBF to achieve the purpose of power saving. The efficient reuse of the common MFMO circuit modules in the SDR DBF can also lead to energy reduction. Finally, the power dissipation and reconfiguration function in the different modes of the SDR DBF are observed from the experiment results.

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“…Volterra models [20] and neural network models [21], [22], with theoretical support for their modeling properties, can be considered the most successful models, but their good performance is shadowed by their computational complexity. The Volterra series [9] is given as follows:…”

Section: Pa Behavioral Modeling and Inverse Modeling For Indirectmentioning

confidence: 99%

“…Moreover, software-based implementation offers high reconfigurability for any change in transmitter hardware and configuration, and also supports the concept of software-defined radio at the transmitter end for effective communication [9].…”

mentioning

confidence: 98%

Generalized Rational Functions for Reduced-Complexity Behavioral Modeling and Digital Predistortion of Broadband Wireless Transmitters

Rawat

Ghannouchi

et al. 2014

IEEE Trans. Instrum. Meas.

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In this paper, we present and analyze rationalfunction-based digital predistortion (DPD) of transmitters for broadband applications where system noise and prominent memory effects contribute to the overall nonlinearity of the system. The performance is reported for simulation and measured results for gallium nitride (GaN)-based class-AB and laterally diffused MOS (LDMOS)-based Doherty power amplifiers (PAs) using three different wideband code division multiple access signals with peak-to-average-power ratios of around 10 dB. The performance of the proposed model, in terms of normalized meansquare error, adjacent channel power ratio, matrix condition number, and coefficient dispersion, is compared against those of a memory polynomial (MP) model and a previously proposed rational-function-based model. It is shown by simulation and measurement that the previously proposed absolute-term denominator rational functions have limitations in the inverse modeling needed for DPD. A new variation of the rational function is proposed to alleviate this limitation. Depending on the type of PA and signals, a floating-point operation reduction of 8%-38% is reported as compared with a low-complexity MP model.

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Design of Software-Defined Radio Channel Simulator for Wireless Communications: Case Study With DSRC and UWB Channels

Cited by 21 publications

References 13 publications

Improved Pilot-Aided Channel Estimation for MIMO-OFDM Fading Channels

Improved Pilot-Aided Channel Estimation for MIMO-OFDM Fading Channels

Hierarchical MFMO Circuit Modules for an Energy-Efficient SDR DBF

Generalized Rational Functions for Reduced-Complexity Behavioral Modeling and Digital Predistortion of Broadband Wireless Transmitters

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