802.11a

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Quiz on IEEE 802.11a specifications

by Krishna Sankar on October 7, 2009

The IEEE 802.11a specifications are used by many to understand a wireless communication link built using OFDM. In this post, I have put together a set of 10 multiple choice questions based on 802.11a specifications. [...]

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Frequency offset estimation using 802.11a short preamble

by Krishna Sankar on March 3, 2008

plot of frequency offset estimate using 802.11a short preamble

From the previous post on OFDM (here), we have understood that an OFDM waveform is made of sum of multiple sinusoidals (also called subcarriers) each modulated independently. In this post, let us try to understand [...]

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Peak to Average Power Ratio for OFDM

by Krishna Sankar on February 24, 2008

cdf_papr_ofdm_bpsk

Let us try to understand peak to average power ratio (PAPR) and its typical value in an OFDM system specified per IEEE 802.11a specifications. What is PAPR? The peak to average power ratio for a [...]

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Cylcic prefix in Orthogonal Frequency Division Multiplexing

by Krishna Sankar on February 17, 2008

ofdm symbol with multipath

In a previous post (here), we discussed in brief, Orthogonal Frequency Division Multiplexing (OFDM) transmission. Let us know probe bit more into the motivation of cyclic prefix (aka guard interval) associated with each OFDM symbol. [...]

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