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September 27, 2023
  • Migrated to Amazon EC2 instance (from shared hosting)
  • GATE-2012 ECE Q28 (electromagnetics)
  • Image Rejection Ratio (IMRR) with transmit IQ gain/phase imbalance
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  • Migrated to Amazon EC2 instance (from shared hosting)

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  • GATE-2012 ECE Q28 (electromagnetics)

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

    11 years ago5 months ago
  • GATE-2012 ECE Q15 (communication)

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  • 16-QAM

16-QAM

  • Modulation

Symbol Error rate for QAM (16, 64, 256,.., M-QAM)

Krishna Sankar12 years ago11 years ago441 mins

In May 2008, we derived the theoretical symbol error rate for a general M-QAM modulation (in  Embedded.com, DSPDesignLine.com and dsplog.com) under Additive White Gaussian Noise. While re-reading that post, felt that the article is nice and warrants a re-run, using OFDM as the underlying physical layer. This post discuss the derivation of symbol error rate for a general…

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  • Modulation

Softbit for 16QAM

Krishna Sankar14 years ago11 years ago341 mins

In the post on Soft Input Viterbi decoder, we had discussed BPSK modulation with convolutional coding and soft input Viterbi decoding in AWGN channel. Let us know discuss the derivation of soft bits for 16QAM modulation scheme with Gray coded bit mapping. The channel is assumed to be AWGN alone.

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