difference between BPSK and 16QAM

Posted on 2011-05-10
Medium Priority
Last Modified: 2012-05-11
what is the difference between BPSK and 16QAM
Question by:mc87
LVL 10

Accepted Solution

atlas_shuddered earned 2000 total points
ID: 35730093
16QAM is a subset of the broader scope - QAM (quadrature amplitude modulation).  Additionally BPSK can be assumed a subset as well, though developed along differing lines over time.  Just gee-wiz info but helpful to put things into scope none the less.

What little I do know conscerning the differences.

BPSK is a subset of PSK (Phase Shift Keying) and uses only a single carrier signal, phasing at 180 degree intervals for data (binary) representation (ex. 0 degees = 1, 180 degrees = 0).  Variants of BPSK are used extensively in 802.11.  Additionally, BPSK in its purest form is presented in a linear time phase model (one dimensional).  Of the two, BPSK and QAM, BPSK offers the highest data reliability rate (lowest receiver data error rate).

16QAM as noted above is a direct subset of QAM.  It is utilized in both digital and analog signal modulation schemes and is most often implemented in hard-line (terrestrial) telecommunications - think digital television and cable modems.  QAM and all its direct variants utilize at least 2 carrier signals for data transmission set at different amplitudes, the two waves being out of phase with each other by 90 degrees (quadrature carriers).  This allows for higher transmission rates, therefore more robust data density rates but at the cost of increased data error rate.  This introduces the major difference between the two (BPSK and QAM).  BPSK uses phase shifting only for data representation whereas QAM utilizes phase shifting as well as amplitude modulation.

For further reading and information check these links:

This one first - http://www.radio-electronics.com/info/rf-technology-design/pm-phase-modulation/8qam-16qam-32qam-64qam-128qam-256qam.php

The if needed:

LVL 71

Expert Comment

ID: 36053201
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.

Featured Post

Upgrade your Question Security!

Add Premium security features to your question to ensure its privacy or anonymity. Learn more about your ability to control Question Security today.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Creating an OSPF network that automatically (dynamically) reroutes network traffic over other connections to prevent network downtime.
Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

807 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question