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Author Topic: Ericsson: Thesis - Master Thesis on 4x2 MIMO using STTD Sweden, Stockholm  (Read 5830 times)

Offline sean

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Job description

Research and Development: Applied Research

Description of company:

Research in the area of wireless communication. Topics in focus are: radio access technologies, advanced receivers, advanced antenna systems and propagation. Active in the specification of 2G, 3G and systems beyond 3G (4G).

Thesis description:

Background

Recently, a MIMO transmission scheme was included into the WCDMA specification (Rel-7). This MIMO scheme contain rank adaptation, precoding and is based on the multi codeword principle. This means that for each 2ms TTI, the network decides on the number of transport blocks (rank adaptation) and a beamforming weight for each transport block (precoding). Each transport block is separately turbo encoded to facilitate the use of successive interference cancelling on the receiver side. The MIMO scheme standardized in this release of the specification support up to 2 transmit antennas.

Description

One way to extend the coverage of the MIMO channel would be to increase the number of transmit antennas. This can be done in a number of ways, but one attractive extension would be to apply a space-time code on each of the transmitted data streams. The space-time code in WCDMA is termed space-time transmit diversity (STTD) and is based on the well known Alamouti code. This means that up to 2 separately encoded data streams can be transmitted. But since each stream is STTD encoded, it can be transmitted from 2 antennas. Since the space-time code provides some extra diversity better performance can be expected for lower SINRs.

The aim with this thesis project is to define a MIMO scheme based on applying STTD to the currently defined MIMO scheme. The work would consist of defining the MIMO scheme, deriving suitable receiver algorithms and to evaluate the performance by means of computer simulations.

Requested competence:


180 points in Electrical Engineering, Engineering Physics or Computer Engineering or corresponding programs.
Good knowledge in digital communication theory and signal processing.
Good programming skill in C++ and /or MATLAB

Preferred Starting Date: 2007-06-01

Required Scope: 20 points

Contact person/s:

Bo G√??√??√??√?¬∂ransson
Sen. Specialist, Multi-Antenna Concepts
+46 8 7570703

Mikael H√??√??√??√?¬∂√??√??√??√?¬∂k
Manager, Access Technologies
+46 8 4045140

Competence
See job description

Last day to apply: 2007-05-30

Form of employment: Thesis/Final reports


Offline jessyto27

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I think this thesis is worth reading because it defines a MIMO scheme based on applying STTD to the currently defined MIMO scheme. The work would consist of defining the MIMO scheme, deriving suitable receiver algorithms and to evaluate the performance by means of computer simulations. You should have posted here some excerpts of your thesis.
« Last Edit: June 11, 2010, 02:08:22 AM by jessyto27 »

Offline HelenJames

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« Reply #2 on: July 20, 2010, 11:14:51 AM »
I think this topic was discussed loads of time before at this forum
I'm on Twitter and my essay

Offline SarahGT

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Re: Ericsson: Thesis - Master Thesis on 4x2 MIMO using STTD Sweden, Stockholm
« Reply #3 on: February 23, 2011, 10:18:37 AM »
That dosn't mean it's not a good one. New people can't always dig though the archives on a forum, so some fresh presective can be nice :)