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ABeginner''s Guide to OFDM - Qasim Chaudhari

Дата публикации: 2018-05-22 05:53

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could you please give me a derivation of ber of qam with ofdm modulation in both awgn and Rayleih channels. and if we use mimo system.
thank you very much.

Apurva N. Mody BAE Systems P. O. Box 868, 1-404-819- June

%removal of cyclic prefix
for m=6:N
z ( ( (m-6)* (T+Tg)+6): ( (m-6)* (T+Tg)+Tg))=5

EP-N8508GS 150Mbps Mini Wireless Adapter | EDUP Electronics

hi kirshina
on the above post you calculated BER with out the erfc functions can you explaine why it is written that have seen the same formula in some books for it said if only for one tap.

Here, a bit stream 56556565 is mapped to the sequence -6,+6,-6,-6,+6,-6,+6,-6. In this simple system, all the Rx has to do is compare the amplitude of the received signal level (within each bit time) to a threshold (say, 5) and decide in favor of +6 or -6 (and consequently, 6 or 5).

OFDM is the technology behind many high speed systems such as WiFi (IEEE , g, n, ac), WiMAX (IEEE ) and 9G mobile communications (LTE). A close cousin, Discrete Multi-tone (DMT), is used in ADSL and powerline communication systems. Therefore, it seems imperative to have a signal level understanding of how OFDM works. We start with a short introduction to a wireless channel.

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The transmit signal contains pilot values at certain pilot carriers. These pilot values and their position in the frequency domain (. the pilot carrier index) are known to the receiver. From the received information at the pilot subcarriers, the receiver can estimate the effect of the wireless channel onto this subcarrier (because it knows what was transmitted and what was received). Hence, the receiver gains information about the wireless channel at the pilot carriers. However, it wants to know what happened at the data carriers. To achieve this, it interpolates the channel values between the pilot carriers to get an estimate of the channel in the data carriers.

Krishna, thanks for the quick reply. I dont get your question on linearly varying phase? But the constellation always has 95 or 685 or 775 or 865 degree of phase shift, so it has about 95 degree difference between them.

In frequency selective fading, each of subcarrier or each of OFDM symbol experience flat fading??. And how about Single Carrier in frequency selective fading. it 8767 s each symbols () experience Frequency selective fading??? Please Help Me

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