MIMO vs. Vector OFDM: What's the Difference?

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Discussion Overview

The discussion centers around the differences and relationships between Vector OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multiple Input Multiple Output) systems. Participants seek clarification on the concepts of vector blocks in MIMO and the specific characteristics of Vector OFDM compared to traditional OFDM.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants question whether Vector OFDM is the same as MIMO and seek to understand the concept of vector blocks in a MIMO system.
  • One participant explains that OFDM is a form of FDM, highlighting the differences in carrier spacing and modulation techniques used in OFDM compared to ordinary FDM.
  • Another participant expresses confusion about the term "vector" in the context of OFDM and MIMO, indicating that it may have different meanings in these contexts.
  • A participant mentions conducting research on a paper regarding the performance of Vector OFDM with a Zero-Forcing Receiver and seeks clarification on the differences between VOFDM and OFDM.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the relationship between Vector OFDM and MIMO, as well as the definition and implications of vector blocks. Multiple competing views and uncertainties remain in the discussion.

Contextual Notes

Participants express limitations in their understanding of orthogonal FDM and the specific characteristics of vector blocks, indicating a need for further clarification and exploration of these concepts.

janu203
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Is vector OFDM (Orthogonal Frequency division multiplexing) same as MIMO?
What are vector blocks in a MIMO system then?
I know what is Frequency division multiplexing but can't understand orthogonal FDM.
HELP!
 
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OFDM is a form of FDM. In ordinary FDM, carrier spacing is wide enough, including guard bands, to prevent interference between carriers. In OFDM, carrier spacing is very close, so close that carriers actually overlap. This is achieved by having all carriers digitally modulated, and at exactly the same baud rate. Carrier spacing is then chosen such that the center frequency of each carrier cooresponds to a spectral null of all other carriers. (Digital modulation produces sinc spectral envelope).

MIMO is a scheme for using multiple antennas for spatial diversity.
 
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ok but do you have any idea of VECTOR OF OFDM? and what are vector blocks of a channel
 
janu203 said:
Is vector OFDM (Orthogonal Frequency division multiplexing) same as MIMO?
What are vector blocks in a MIMO system then?
I know what is Frequency division multiplexing but can't understand orthogonal FDM.
HELP!

janu203 said:
ok but do you have any idea of VECTOR OF OFDM? and what are vector blocks of a channel

Can you give us some links to the materials you have been reading about this? The term "vector" would have pretty different meanings in the contexts of MIMO and OFDM...
 
On Performance of Vector OFDM with Zero-Forcing Receiver

I am doing research on this paper. but can't figure out the what's the difference between VOFDM and OFDM? and similarly what are vector blocks
 

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