The effects of phase noise in COFDM
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#1
30-09-2010, 08:04 PM


The effects of phase noise in COFDM
The reception of a COFDM signal is analyzed in this article taking the particular case that phase noise has been added to the signal. The distinguished errors found are : common phase error and inter-carrier interference. using a pair of weighting functions, the effects of this distortions is removed from the signal.

How is phase noise introduced
Phase noise is the random perturbation of the phase of the steady sinusoidal waveform and practically all oscillators are affected by this. The phase noise maybe introduced in the process of shifting the modulated signal up to RF in the transmitter, and also in the process of downshifting from RF to IF or baseband in the receiver. The phase-noise spectrum of local oscillators(frequency stabilised by PLL ) depends on the properties of the free-running oscillator, and also the components of the PLL . the phase noise
of all the LOs in the chain between the receiver and the modulator will be present in the receiver.

two types of phase-noise contribution
The two types are The “common” phase-error part and the The "thermal-noise-like" part.

For more details, refer this pdf:

.pdf   The effects of phase noise in COFDM.pdf (Size: 589.66 KB / Downloads: 64)





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jijoandjojy
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#2
30-09-2010, 08:24 PM

Coded Orthogonal Frequency Division Multiplexing (COFDM) is a form of
modulation which is particularly well-suited to the needs of the terrestrial
broadcasting channel. COFDM can cope with high levels of multipath
propagation, with a wide spread of delays between the received signals. This
leads to the concept of single-frequency networks in which many transmitters
send the same signal on the same frequency, generating “artificial multipath”.
COFDM also copes well with co-channel narrowband interference, as may be
caused by the carriers of existing analogue services.
COFDM has therefore been chosen for two recent new standards for
broadcasting – DAB and DVB-T, both of which have been optimized for their
respective applications and have options to suit particular needs.
The special performance of COFDM in respect of multipath and interference is
only achieved by a careful choice of parameters and with attention to detail in
the way in which the forward error-correction coding is applied.


Attached Files
.pdf   7352554-Gen-Theory-of-Phase-Noise.pdf (Size: 479.66 KB / Downloads: 28)
.pdf   22214924-What-is-COFDM-The-Modulation-Scheme-That-DAB-Uses-Is.pdf (Size: 242.23 KB / Downloads: 44)
.pdf   26467030-Effect-of-Phase-Noise-and-Imperfect-Channel.pdf (Size: 442.67 KB / Downloads: 37)
.pdf   trev_278-stott.pdf (Size: 296.16 KB / Downloads: 27)
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#3
30-09-2010, 09:04 PM

hey jijoandjojy its very useful one , i think you are such an expert in electronics and communication ,
any way its very interesting
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