DocumentCode :
2588349
Title :
Orthogonal Frequency Division Multiplexing (OFDM)
Author :
Kabir, Waziha
fYear :
2008
fDate :
10-12 Sept. 2008
Firstpage :
178
Lastpage :
184
Abstract :
In broadband wireless system, the signal energy is scattered and reflected from objects in the environment, components of the signal arriving at the receiver are spread out over a longer period of time than is desirable. The challenge is then to provide a high-performance reliable data link that can operate with the restricted receiver power levels, severe channel fading due to multipath reflections and interfering energy from other devices nearby. With OFDM, it is possible to use a differential coding/differential detection either in the time or frequency domain depending on the condition of transmission channels with the adoption of DQPSK as a method of subcarrier modulation. This paper proposes an approximate derivation method of the bit error rate (BER) in DQPSK/OFDM system over frequency non-selective Nakagmai-Rice and Rayleigh fading channels. The validity of this equation is confirmed from the fact that the BER derived from this approximate equation coincides with that from the computer simulation, even when the system parameters, for example Doppler frequency, Rician parameter and so on, are varied. This paper will also review where OFDM is applicable and future applications.
Keywords :
Nakagami channels; OFDM modulation; Rayleigh channels; differential phase shift keying; error statistics; multipath channels; quadrature phase shift keying; reliability; BER; DQPSK; Nakagmai-Rice fading channels; OFDM; Rayleigh fading channels; bit error rate; differential coding; differential detection; multipath reflections; orthogonal frequency division multiplexing; subcarrier modulation; Bit error rate; Computer simulation; Equations; Fading; Frequency domain analysis; Modulation coding; OFDM modulation; Power system reliability; Rayleigh scattering; Reflection; ADSL; BER; BPSK; CDMA; DQPSK; OFDM; PAPR; QAM;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Conference, 2008 China-Japan Joint
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-3821-1
Type :
conf
DOI :
10.1109/CJMW.2008.4772401
Filename :
4772401
Link To Document :
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