dspLog - Signal processing for communication

Time 2021-11-19 23:18:19

Web Name: dspLog - Signal processing for communication

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keywords:dsp, digital signal processing, signal processing, digital communication, modulation, ofdm
description:This is an educational blog aimed at helping the reader understand the theory behind digital signal processing blocks used in digital communication transmitter and receiver. The theory is explained using classical text books as reference accompanied with simulation model using Matlab and/or Octave scripts.
DSP log Google HomeAboutBlog Analog Channel Coding DSP GATE MIMO Modulation OFDMSubscribe Six equalizers for V-BLAST

Apr 21st, 200967 Comments

In the past, we had discussed several posts on two transmit two receive MIMO communication, where the transmission was based on V-BLAST. The details about V-BLAST can be read from the landmark paper V-BLAST: An [...]

Read More... Transmit beamforming

Apr 13th, 200963 Comments

In this post lets discuss a closed-loop transmit diversity scheme, where the transmitter has the knowledge of the channel. As there is a feedback path required from the receiver, to communicate the channel seen by [...]

Read More... Alamouti STBC with 2 receive antenna

Mar 15th, 2009147 Comments

In the past, we had discussed two transmit, one receive antenna Alamouti Space Time Block Coding (STBC) scheme. In this post, lets us discuss the impact of having two antennas at the receiver. For the [...]

Read More... MIMO with ML equalization

Dec 14th, 200897 Comments

We have discussed quite a few receiver structures for a 22 MIMO channel namely, (a) Zero Forcing (ZF) equalization (b) Minimum Mean Square Error (MMSE) equalization (c) Zero Forcing equalization with Successive Interference Cancellation (ZF-SIC) [...]

Read More... MIMO with MMSE SIC and optimal ordering

Dec 6th, 200826 Comments

This post attempts to build further on the MIMO equalization schemes which we have discussed (a) Minimum Mean Square Error (MMSE) equalization, (b) Zero Forcing equalization with Successive Interference Cancellation (ZF-SIC) and (c) ZF-SIC [...]

Read More... MIMO with ZF SIC and optimal ordering

Nov 29th, 200827 Comments

In previous posts, we had discussed equalization of a 22 MIMO channel with Zero Forcing (ZF) equalization and later, Zero Forcing equalization with successive interference cancellation (ZF-SIC). In this post, we will explore a variant [...]

Read More... MIMO with Zero Forcing Successive Interference Cancellation equalizer

Nov 9th, 200864 Comments

The post on MIMO with Zero Forcing equalizer discussed a probable way of equalizing a 22 MIMO channel. The simulated results with the 22 MIMO system with zero forcing equalizer showed matching results as obtained [...]

Read More... MIMO with MMSE equalizer

Nov 2nd, 2008245 Comments

In a previous post, we had discussed a 22 MIMO transmission using BPSK modulation in Rayleigh channel with a Zero Forcing equalizer. The simulated results with the 22 MIMO system  with zero forcing equalizer showed [...]

Read More... MIMO with Zero Forcing equalizer

Oct 24th, 2008154 Comments

We had discussed three Single Input Multiple Output (SIMO also known as receive diversity) schemes Selection combining, Equal Gain Combining, Maximal Ratio Combining and a Multiple Input Single Output (MISO, also known as transmit [...]

Read More... Alamouti STBC

Oct 16th, 2008273 Comments

In the recent past, we have discussed three receive diversity schemes Selection combining, Equal Gain Combining and Maximal Ratio Combining. All the three approaches used the antenna array at the receiver to improve the [...]

Read More... Filter
BER for BPSK in ISI channel with Zero Forcing equalization

Nov 29th, 200957 Comments

Eye diagram with raised cosine filtering

May 1st, 200820 Comments

Raised cosine filter for transmit pulse shaping

Apr 22nd, 200844 Comments

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

Apr 26th, 20109 Comments

Quiz on IEEE 802.11a specifications

Oct 7th, 200910 Comments

Inter Carrier Interference (ICI) in OFDM due to frequency offset

Aug 8th, 200965 Comments

BER for BPSK in OFDM with Rayleigh multipath channel

Aug 26th, 2008319 Comments

Trying out PAPR reduction for OFDM by multiplication with j

Jul 2nd, 200847 Comments

MIMO
Six equalizers for V-BLAST

Apr 21st, 200967 Comments

Transmit beamforming

Apr 13th, 200963 Comments

Alamouti STBC with 2 receive antenna

Mar 15th, 2009147 Comments

MIMO with ML equalization

Dec 14th, 200897 Comments

MIMO with MMSE SIC and optimal ordering

Dec 6th, 200826 Comments

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

The post on IQ imbalance in transmitter, briefly discussed the effect of amplitude and phase imbalance and also showed that IQ imbalance results in spectrum at the image frequency. In this article, we will quantify [...]

Modeling phase noise (frequency domain approach)

Sep 30th, 20121 Comment

Transmit spectrum with phase noise

Aug 28th, 2012No Comments

EVM with phase noise

Jul 9th, 20129 Comments

Phase noise power spectral density to Jitter

Jun 22nd, 20123 Comments

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

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 [...]

Non coherent demodulation of pi/8 D8PSK (TETRA)

Jul 20th, 20105 Comments

Non coherent demodulation of pi/4 DQPSK (TETRA)

Apr 12th, 20109 Comments

Softbit for 16QAM

Jul 5th, 200934 Comments

MSK transmitter and receiver

Jun 16th, 200947 Comments

Channel
BER for BPSK in ISI channel with MMSE equalization

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 [...]

BER with Matched Filtering

May 8th, 200938 Comments

Derivation of BPSK BER in Rayleigh channel

Jan 22nd, 200949 Comments

MIMO with ML equalization

Dec 14th, 200897 Comments

News
Migrated to Amazon EC2 instance (from shared hosting)

Mar 11th, 2013No Comments

Update : Correction to solution of GATE-2012 ECE Q38

Nov 9th, 20122 Comments

Migration to new template (skin)

Sep 11th, 2012No Comments

Solved!

Apr 4th, 20122 Comments

Back!

Oct 22nd, 20119 Comments

DSP
Modeling phase noise (frequency domain approach)

Sep 30th, 20121 Comment

Weighted Least Squares and locally weighted linear regression

Feb 5th, 2012No Comments

Least Squares in Gaussian Noise Maximum Likelihood

Jan 15th, 2012No Comments

Newtons method to find square root, inverse

Dec 25th, 20111 Comment

Closed form solution for linear regression

Dec 4th, 201110 Comments

Coding
Hamming (7,4) code with soft and hard decoding

An earlier post we discussed hard decision decoding for a Hamming (7,4) code and simulated the the bit error rate. In this post, let us focus on the soft decision decoding for the Hamming (7,4) [...]

Hamming (7,4) code with hard decision decoding

Sep 29th, 200949 Comments

Matlab or C for Viterbi Decoder?

Aug 21st, 200923 Comments

Viterbi with finite survivor state memory

Jul 27th, 200910 Comments

Soft Input Viterbi decoder

Jan 14th, 200949 Comments

GATE
GATE-2012 ECE Q28 (electromagnetics)

Question 28 on electromagnetics from GATE (Graduate Aptitude Test in Engineering) 2012 Electronics and Communication Engineering paper. Q28. A transmission line with a characteristic impedance of 100 is used to match a 50 section to a 200 section. If the matching [...]

GATE-2012 ECE Q15 (communication)

Jan 25th, 2013No Comments

GATE-2012 ECE Q7 (digital)

Jan 23rd, 2013No Comments

GATE-2012 ECE Q13 (circuits)

Jan 22nd, 20134 Comments

GATE-2012 ECE Q34 (signals)

Dec 29th, 2012No Comments

Connect with usAdvertisement More Recent PostsMigrated to Amazon EC2 instance (from shared hosting)GATE-2012 ECE Q28 (electromagnetics)Image Rejection Ratio (IMRR) with transmit IQ gain/phase imbalanceGATE-2012 ECE Q15 (communication)GATE-2012 ECE Q7 (digital)GATE-2012 ECE Q13 (circuits)GATE-2012 ECE Q34 (signals)Advertisement RatingsSymbol Error Rate (SER) for QPSK (4-QAM) modulation (5.00 out of 5)BER for BPSK in ISI channel with MMSE equalization (5.00 out of 5)Chi Square Random Variable (5.00 out of 5)Using Toeplitz matrices in MATLAB (5.00 out of 5)IQ imbalance in transmitter (5.00 out of 5)Bit error rate for 16PSK modulation using Gray mapping (5.00 out of 5)Signal to quantization noise in quantized sinusoidal (5.00 out of 5)BER for BPSK in ISI channel with Zero Forcing equalization (5.00 out of 5)About (5.00 out of 5)Negative Frequency (5.00 out of 5)Advertisement Tags16-PSK16-QAM802.11a2012AlamoutiAWGNBPSKCapacityCommunicationconferenceDigitalDiversityECEelectromagneticseye diagramfirst orderFSKGATEGrayIIScinterpolationmachine_learningMathMIMOMLMMSEmodulatornoiseNyquistOFDMPAMpdfphasephase_noisePSKpulse shapingQAMraised cosineRayleighSICSTBCTETRAtransmitterViterbiZFAdvertisement from Amazon

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This is an educational blog aimed at helping the reader understand the theory behind digital signal processing blocks used in digital communication transmitter and receiver. The theory is explained using classical text books as reference accompanied with simulation model using Matlab and/or Octave scripts.

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