Results 141 to 150 of about 1,441 (173)

Performance enhancement of SC-FDMA systems using a companding technique

annals of telecommunications - annales des télécommunications, 2010
In this paper, a companding technique is proposed to effectively reduce the peak-to-average power ratio (PAPR) in single-carrier frequency division multiple access (SC-FDMA) systems. By companding the samples with large amplitudes, while enhancing those with small amplitudes, a significant reduction in the PAPR can be achieved.
Fathi E. Abd El-Samie, Faisal S. Al-Kamali, Moawad I. Dessouky, Bassiuny M. Sallam, Farid Shawki   +4 more
openaire   +1 more source

Companding techniques for SC-FDMA and sensor network applications

International Journal of Electronics Letters, 2019
The large Peak-to-Average Power Ratio (PAPR) is a serious problem in wireless communication systems for mobile and sensor network applications.
Amal F Abd El-Rahman, Rania A Ahmed, Mustafa M. Abd Elnaby, Salah Khamis, Sameh Napoleon, Mohammed Abd-Elnaby, Zeinab A Ahmed, El-Sayed M. El-Rabaie, Fathi E. Abd El-Samie   +8 more
openaire   +1 more source

A companding technique for PAPR reduction in DWT OFDM systems

2014 IEEE International Conference on Advanced Communications, Control and Computing Technologies, 2014
Orthogonal frequency division multiplexing (OFDM) technique is considered as a advance technology in realizing high-speed wireless digital communications. However, high peak-to-average power ratio (PAPR) of transmitted signals is a major drawback for multi-carrier modulation systems such as orthogonal frequency division multiplexing and discrete ...
Bhawana Mohanty, Srinivas Ramavath
openaire   +1 more source

Analysis of Companding Techniques Applied to Onboard Telemetry Systems

Applied Mechanics and Materials, 2012
In order to increase the dynamic range and the signal-to-quantization noise ratio (SQNR) of telecommunication systems, companding techniques were developed, such as the μ-law and the A-law. These techniques allow a non-uniform quantization of the signal using a compressor circuit followed by a uniform quantizer in the transmitter and the reconstruction
Marcio Barbosa Lucks, Heuller A.C. Procópio   +1 more
openaire   +1 more source

Partial companding as a PAPR reduction technique of an OFDM system

2012 International Conference on Informatics, Electronics & Vision (ICIEV), 2012
In this paper, a new technique of BER minimization in a companding based PAPR reduction scheme is proposed. In this approach, the conventional companding scheme is only applied for those OFDM signals whose amplitude exceeds a predefined threshold level, which results in lower BER and lower computational time. Though for the proposed scheme, improvement
Tabassum Haque, Subaha Mahmuda, Feroz Ahmed   +2 more
openaire   +1 more source

Two "noninvasive" techniques for syllabic companding in signal processors

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, 2001
Two novel methods are described for syllabic companding in signal processors. These methods make state variable updating unnecessary, for piecewise constant input and output gains. Measurements and simulations are used as confirmation of the validity of the proposed techniques.
L. Toth, G. Palaskas, Y.P. Tsividis
openaire   +1 more source

A New Companding Technique for PAPR Reduction in OFDM Communication Systems

Wireless Communications, 2011
One of the major disadvantages of OFDM communication systems is their high peak-to-average power ratio (PAPR) which degrades system performance when nonlinear power amplifiers are employed. Among the proposed PAPR techniques companding is favorable due to its simplicity and easy of implementation.
openaire   +2 more sources

Novel companding technique for PAPR reduction in OFDM system

International Conference on Recent Advances and Innovations in Engineering (ICRAIE-2014), 2014
High value of PAPR and Inter-carrier Interference are two main drawbacks of the orthogonal frequency division multiplexing (OFDM) based wireless systems. The problem of high value of PAPR has been addressed in this work. A novel companding technique is proposed to reduce the PAPR of OFDM signals.
Eashendra Singh, Mohammad Arif
openaire   +1 more source

Companding technique for PAPR reduction in OFDM systems based on an exponential function

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005
In this paper, a new non-linear companding technique, called "exponential companding", is proposed to reduce the high peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals. Unlike the mu-law companding scheme, which enlarges only small signals so that increases the average power, the schemes based on ...
Tao Jiang 0001, Yang Yang 0001, Yong-Hua Song   +2 more
openaire   +1 more source

Adaptive slope and threshold companding technique for PAPR reduction in OFDM systems

2012 19th IEEE International Conference on Electronics, Circuits, and Systems (ICECS 2012), 2012
High Peak to Average Power Ratio (PAPR) of transmitted signals is a major drawback for multi-carrier modulation systems such as orthogonal frequency division multiplexing (OFDM) systems. Companding technique has been recently used to reduce PAPR. In this work, an adaptive slope and threshold (AST) companding transform is proposed to increase the ...
Vivek Yenamandra, Feiran Lei, Saleh R. Al-Araji, Nazar T. Ali, Mohammed Ismail 0001   +4 more
openaire   +1 more source