How to Evaluate Multiple Access Interference in Time-Hopping PPM Systems?

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Discussion Overview

The discussion revolves around evaluating Multiple Access Interference (MAI) in Time-Hopping Pulse Position Modulation (PPM) systems. Participants explore various factors that may influence the evaluation process, including signal characteristics and protocol considerations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant suggests finding the mean and variance of the transmitted signal to evaluate MAI.
  • Another participant emphasizes the importance of considering additional factors such as signal cross-correlations, protocol retry algorithms, transmission burst lengths, and the probability of simultaneous transmissions.
  • A participant seeks clarification on the term "Protocols" and mentions using Pulse Position Amplitude Modulation and a correlation receiver.
  • There is a discussion about the necessity of factoring in multiple access protocols (e.g., CSMA, TDMA) when calculating interference statistics.
  • One participant confirms the use of Time Hopping format and a multipath fading channel model for their analysis.
  • A later post expresses a desire to evaluate MAI specifically for a communication system using Time Hopping and Bi-orthogonal PPM or PPM, asking for guidance on the necessary steps.

Areas of Agreement / Disagreement

Participants generally agree on the complexity of evaluating MAI and the need to consider various factors, but there is no consensus on the specific steps or methodologies to be employed.

Contextual Notes

Participants mention various protocols and configurations that may affect the evaluation of MAI, indicating that the discussion is dependent on specific definitions and assumptions about the communication system being analyzed.

Who May Find This Useful

This discussion may be useful for individuals interested in communication systems, particularly those working with multiple access techniques and modulation schemes in the context of interference evaluation.

T.Engineer
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in order to evaluate the Multiple Access interfernce should I find the mean and variance for the transmitted Signal?
Thanks a lot!
 
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At least those, though often it's necessary to look at
other aspects of things like the signal crosscorrelations,
the protocol retry algorithms / protocol timings / packet or
transmission burst lengths, FEC coding, probability of
simultaneous transmissions, etc. etc.

Basically it depends a lot upon the protocols, the
modulation schemes, and the configurations of the
transmitters/receivers what the actual interference
statistics will be.
 
xez said:
At least those, though often it's necessary to look at
other aspects of things like the signal crosscorrelations,
the protocol retry algorithms / protocol timings / packet or
transmission burst lengths, FEC coding, probability of
simultaneous transmissions, etc. etc.

Basically it depends a lot upon the protocols, the
modulation schemes, and the configurations of the
transmitters/receivers what the actual interference
statistics will be.

Please, what do you mean by Protocols?
I am going to use Pulse Position Amplitude Modulation and correlation receiver.
and if I will find the crosscorrelation for the transmitted signal, what it will be the point?
So, what I have to do?
Thanks a lot!
 
T.Engineer said:
Please, what do you mean by Protocols?
I am going to use Pulse Position Amplitude Modulation and correlation receiver.

You said "multiple access", so xez and I assume you mean multiple transmitters colliding a a receiver. There must be some protocol for multiple access (CSMA, TDMA, etc.), so you must factor the protocol into your calculations.
 
yes exactly.
I am going to use Time Hopping format for multiple access and multipath Fading Channel model.
if you want any other information, please tell me.
Thanks a lot!
 
In other word I'd like to evaluate the multiple access interference for a communication system using time hoping format and Bi- orthogonal pulse position modulation or pulse position modulation.
So, generally What I should do?
 

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