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2010

  • Modulation

Non coherent demodulation of pi/8 D8PSK (TETRA)

Krishna Sankar15 years ago13 years ago51 mins

In TETRA specifications, one of the modulation technique used is Differential 8 Phase Shift Keying (D8PSK). We will discuss the bit error rate with non-coherent demodulation of D8PSK in Additive White Gaussian Noise (AWGN) channel.

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  • OFDM

IEEE 802.11ac – Very High Throughput for lower 6GHz band

Krishna Sankar15 years ago13 years ago91 mins

IEEE 802.11ac Very High Throughput (for <6GHz band) is an upcoming standard which is development by IEEE standardization committee. The mandate of Task Group AC is supposed to enhance the High Throughput rates achieved by 802.11n.  As described in the document VHT below 6GHz PAR plus 5C’s (802.11-08/0807r4) the group has the following objectives :

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  • Modulation

Non coherent demodulation of pi/4 DQPSK (TETRA)

Krishna Sankar15 years ago13 years ago91 mins

In TETRA specifications, one of the modulation technique used is Differential Quaternary Phase Shift Keying (DQPSK). We will discuss the bit error rate with non-coherent demodulation of DQPSK in Additive White Gaussian Noise (AWGN) channel.

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  • Uncategorized

TETRA Air interface specifications – Overview

Krishna Sankar15 years ago13 years ago51 mins

TETRA (TErrestrial Trunked RAdio) is a wireless specification intended to be used by government agencies, public health services, rail transport, military etc. TETRA specification comes from ETSI (European Telecommunication Standards Institute). We plan to start a post series on the building blocks of TETRA physical layer and radio specifications and this is the first post…

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  • Channel

BER for BPSK in ISI channel with MMSE equalization

Krishna Sankar15 years ago13 years ago651 mins

In the past, we had discussed BER for BPSK in flat fading Rayleigh channel and BER for BPSK in a frequency selective channel using Zero Forcing Equalization. In this post, lets discuss a frequency selective channel with the use of Minimum Mean Square Error (MMSE) equalization to compensate for the inter symbol interference (ISI). For…

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16-PSK 16-QAM 802.11a 2012 Alamouti AWGN BPSK Capacity Communication conference Digital Diversity ECE electromagnetics eye diagram first order FSK GATE Gray IISc interpolation machine_learning Math MIMO ML MMSE modulator noise Nyquist OFDM PAM pdf phase phase_noise PSK pulse shaping QAM raised cosine Rayleigh SIC STBC TETRA transmitter Viterbi ZF

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  • Krishna Sankar on Download free e-book on error probability in AWGN
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  • yousif on Alamouti STBC with 2 receive antenna
  • Krishna Sankar on MIMO with Zero Forcing equalizer
  • Krishna Sankar on Bit Error Rate (BER) for BPSK modulation
  • Krishna Sankar on MIMO with MMSE equalizer
  • Krishna Sankar on BER for BPSK in ISI channel with Zero Forcing equalization

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