frequency offset Archives

Frequency offset estimation using 802.11a short preamble

Krishna Sankar17 years ago12 years ago831 mins

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 the estimation of frequency offset in a typical OFDM receiver (using the short preamble specified per IEEE 802.11a specification as…

First order digital PLL for tracking constant phase offset

Krishna Sankar17 years ago12 years ago141 mins

Considering a typical scenario where there might exist a small phase offset between local oscillator between the transmitter and receiver. Figure 1 : Transmitter receiver with constant phase offset In such cases, it might be desirable to estimate and track the phase offset such that the performance of the receiver does not degrade.

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GATE-2012 ECE Q28 (electromagnetics)

Image Rejection Ratio (IMRR) with transmit IQ gain/phase imbalance

GATE-2012 ECE Q15 (communication)

GATE-2012 ECE Q7 (digital)

GATE-2012 ECE Q13 (circuits)

frequency offset

Frequency offset estimation using 802.11a short preamble

First order digital PLL for tracking constant phase offset