Freeware Listing: Rayleigh

This script simulates QPSK or 4-QAM modulation scheme in Rayleigh channel and compares it to theoretical limits. QPSK gives 3dB SNR degradation when compared to BPSK but twice as much throughput. I hope this will be helpful for students of wireless communication..

  • Platform: Matlab, Scripts

This file calculates BER for or a number of SNR values in Rayleigh Channel. Every BER value has been calculated for 100 errors for precision results. I hope script will help students..

  • Platform: Matlab, Scripts

Accepts temperature in Kelvin, pressure in millibar and wavelength in microns (accurate for wavelengths 0.20-4.00 microns) and returns the model atmosphere Rayleigh angular volume-scattering coefficient. Includes Chandrasekhar phase function..

  • Publisher: John Smith
  • Date: 19-02-2013
  • Size: 10 KB
  • Platform: Matlab, Scripts

This is a code for simulation of BPSK receiver using Direct Sequence Spread Spectrum. The performnace is evaluated in presence of AWGN and Rayleigh fading. Jakes' Model has been used to obtained coefficients for rayleigh fading..

  • Platform: Matlab, Scripts

This m-file finds the bit error rate performance of BPSK DS-SS system over (i) AWGN channel and (ii) Slow Rayleigh fading channel corrupted by AWGN. Compare the performance with simple BPSK system. In this simulation I have used two functions.So to see the result open all the files and then run ber_performance file..

  • Platform: Matlab, Scripts

Simple Matlab example simulating a BPSK transmission and reception in Rayleigh channel. The script performs the following (a) Generate random binary sequence of +1's and -1's. (b) Multiply the symbols with the channel and then add white Gaussian noise. (c) At the receiver, equalize (divide) the received symbols with the known channel (d) Perform hard decision decoding and count the bit errors (e) Repeat for multiple values of and plot the simulation and theoretical results. The theoretical description provided in http://www.dsplog.com/2008/08/10/ber-bpsk-rayleigh-channel/.

  • Platform: Matlab, Scripts

FORTRAN code provided in Xingguo Pan's 2002 dissertation entitled "Coherent Rayleigh-Brillouin Scattering" was converted to .m and is provided here. Both s6 and s7 models are provided. The code is validated.

  • Publisher: John Smith
  • Date: 01-04-2013
  • Size: 10 KB
  • Platform: Matlab, Scripts

HRS Computing is a scientific software that simulates the Hyper Rayleigh Scattering (HRS), which is a nonlinear optics phenomenon..

  • Platform: Linux, Mac OS X, WinOther

This model simulates a CDMA2000 1xRTT Forward link (between Base Station and Mobile Station). In particular, it simulates the Radio Configuration 3 of a Forward Fundamental channel. The block CDMA2k: Initial settings allows you to set different parameters such as data rate, Power Control SubChannel insertion rate, spreading code index, QOSF index and the channel model. This application example includes the following blocks: - Frame Quality Indicator insertion and extraction - Adding and deleting Tail Bits before and after coding - Convolutional encoding and decoding - Repetition and derepetition - Puncturing and Zero padding - Interleaving - Long Code scrambling - Power Control insertion - Signal Point mapping - Modulation - Spreading by Walsh code and a QOF mask - Walsh Code rotation - Quadrature scrambling by a PN Sequence - Tx...

  • Platform: Matlab, Scripts

Randomly generated information is modulated using 16 QAM and passed through Rayleigh fading channel and AWGN is added.PSAM (pilot symbol assisted modulation)i.e pilot symbols are inserted into sequence of information symbols periodically is done before transmission inorder to estimate channel coefficients.At receiver first pilot symbols are seperated and channel coefficient at pilot frequencies are calculated by dividing received pilot symbol amplitude by actual pilot symbol amplitude.Using these values , channel values inbetween are interpolated by using different interpolation techniques(FFT , spline cubic,cubic,linear).

  • Platform: Matlab, Scripts

ALAMOUTI performs Monte-Carlo simulation and estimates Bit Error Rate (BER) of Alamouti Scheme [1] over Rayleigh channel. The scheme presumes 2 transmit (Tx) and arbitrary number of receive (Rx) elements. If Rx=1 (one receive element) the ALAMOUTI is transformed to the order 2 transmit diversity scheme with Maximum Ratio Combining (MRC). The modulation format is MPSK with arbitrary order M which can be controlled by user. The simulation parameters are entered using the built graphic user interface (GUI) and contains: 1. Number of pair symbols from both Tx elements to be transmitted: N. This number should be at least 10 times more that the expected 1/BER to provide low estimation error.

  • Publisher: G. Levin
  • Date: 25-06-2013
  • Size: 10 KB
  • Platform: Matlab, Scripts

Finding the Fourier transform of a rectangular pulse.. filtering the spectrum and regenerating the signal using the filtered spectrum is done... at the end Rayleigh theorem is proved by showing that the energy content of both time domain and frequency domain signals are equal.. your comments are required......

  • Platform: Matlab, Scripts

In this programe a highly scattered enviroment is considered. The Capacity of a MIMO channel with nt transmit antenna and nr recieve antenna is analyzed. The power in parallel channel (after SVD decomposition) is distributed as water-filling algorithm The pdf of the matrix "lanada" ( V in SVD decomposition) elements is depicted too..

  • Platform: Matlab, Scripts

BER/SER Curves The files in this demo are designed to generate a number of performance curves for various well-known systems. This is not meant to be a comprehensive list; it's merely a set of reference models that show how some well-established results can be generated using Simulink models. It contains the following systems: - PSK and QAM over AWGN Channel (BER and SER) - BPSK over Rayleigh fading channel (BER) - Convolutional Coded BPSK over AWGN (BER) To go through the demos, run the following command at the MATLAB prompt: example_sel2html('RefCurvesSel.txt') Required Products: MATLAB R2008a Simulink Communications Toolbox Communications Blockset For feedback on these models, email: Idin Motedayen-Aval imoteday@mathworks.

  • Platform: Matlab, Scripts

Performs neural spike pattern analysis on extracellular potentials acquired with TDT's System3 and OpenEx software. More on current functions: All-Order Inter-Spike Interval Histogram. Inter-Spike Interval Histogram for any order or combination of orders. First-Order Inter-Spike Interval Histogram. Period Histogram, Synchronicity or 'Vector Strength', and Rayleigh Statistic Raster Plot, Peri-Stimulus-Time Histogram, Average Onset Latency, and Spike Counts Check back often for bugfixes and improvements. Comments are welcome. Important: See comments within code..

  • Platform: Matlab, Scripts

Nothing beats a beautiful sunset and even if you can't be on a beach enjoying one in person, we've got the next best thing. Crimson Skies is a breathtaking slideshow of some of the most beautiful red sunsets you have ever seen. Beware though, this screensaver is guaranteed to make you want to stop working early! Crimson Skies is a free screensaver created by RateMyScreensaver.com containing 11 high quality photographs. The red hues of the sky at sunset and sunrise are caused by Mie Scattering, not Rayleigh Scattering. The colours of the sky throughout the day and at sunrise and sunset, are explained by the phenomena of both Rayleigh Scattering and Mie Scattering.

  • Platform: Win2000, WinOther, WinVista

Amazing Sunsets is a stunning compilation of some of the most beautiful sunsets you have ever seen. The colours of the sky throughout the day and at sunrise and sunset, are explained by the phenomena of both Rayleigh Scattering and Mie Scattering. The colour of the sky described by Rayleigh Scattering applies to the hues of blue, violet and green, not to the reds, oranges, peaches and purples of sunrise and sunset. Rayleigh Scattering is scattering of shorter wavelength light (e.g. blue & violet) by air atoms and molecules. Amazing Sunsets is a free screensaver created by RateMyScreensaver.com containing 19 high quality photographs.

  • Platform: Win2000, WinOther, WinVista

I'm actually having trouble with the equalization of the channel, because the doppler effect introduces phase rotation, which I don't know how to correct. If anyone could help me, I' d be really thankful..

  • Platform: Matlab, Scripts

Discuss the case where there a multiple (two) transmit antennas and multiple (two) receive antennas resulting in the formation of a 2x2 Multiple Input Multiple Output (MIMO) channel. We will assume that the channel is a flat fading Rayleigh multipath channel and the modulation is BPSK. The equalization scheme used is Zero Forcing. As expected, the simulated results with a 2doOCo2 MIMO system using BPSK modulation in Rayleigh channel is showing matching results as obtained in for a 1doOCo1 system for BPSK modulation in Rayleigh channel. For more theoretical description of Zero Forcing Equalization in 2x2 MIMO channel, please check http://www.

  • Platform: Matlab, Scripts

BPSK SYSTEM SIMULATION We simulate the generation of random variables r0 and r1, which constitutes the input to detector. We begin by generating a binary sequence of 0?s and 1?s that occur with equal probability and are mutually (statistically) independent. For this, we use a Random number generator that generates a uniform random number between 0 and 1. If the number generated is in range (0, 0.5), the binary source output is 0 else it is 1. if 0 is generated, then r0=E+n0 and r1=n1. if a 1 is generated r0=n0 and r1=E+n1. The additive noise components n0 and n1 are generated by mean of two gaussian noise generators there means are zero and there variances, doDl2 = E*N0/2.

  • Platform: Matlab, Scripts

Rayleigh: Freeware | All

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