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Signal Processing Requirements for WiMAX (802.16e) Base Station

By M Shakeel Baig

Abstract:

802.16e provides specifications for non line of sight, mobile wireless communications in the frequency range of 2-6 GHz. It is well implemented by using OFDMA as its physical layer scheme. The OFDM symbol time (sT) is to be selected depending on the channel conditions, available bandwidth and, simulations provide a means of selecting right values of sTin different channel conditions. Additionally it has been shown that certain values of sT outperform others in all conditions, thus invalidating their use. Moreover, a solution proposed by INTEL is also analyzed.

One of the major requirements of OFDM is high synchronization. Detecting the timing offset of a new mobile user, entering the network, which is not time aligned using cross-correlation and ‘auto-correlation’ in time domain and cross-correlation in frequency domain at the base station has been simulated. Results point that the processing load can be significantly reduced by using frequency domain correlation of the received data or by using ‘auto-correlation’ followed by cross-correlation on localized data.

The use of adaptive antenna system in 802.16e improves the system performance, where beamforming is implemented in the direction of desired user. Capon’s method and MUSIC method have been simulated to compute the direction of arrival for OFDMA uplink. A new user, while in the ranging process, transmits data with unknown time offset and unknown direction. The thesis describes the procedure to find the two unknown one after another.

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Comments

azhartaha wrote: [ delete comment ]

6/5/2008

It is very informative as well as good for the beginner in Mobile wimax.

anilkumargoud wrote: [ delete comment ]

4/27/2009

Hi the abstract is very good but Iam unable to download the full document can you help in this regard.

Aya2002 wrote: [ delete comment ]

5/10/2009

i can not download it please help

shanar wrote: [ delete comment ]

7/14/2009

I couldn't download it as well, help me with it please

chirag.nishu wrote: [ delete comment ]

9/21/2009

couldn't able to download either

rizvi wrote: [ delete comment ]

11/17/2009

it is very intresting topic

knarne wrote: [ delete comment ]

12/1/2009

unable to download the file can any 1 help out of it

anjriterz wrote: [ delete comment ]

5/9/2010

can't download the file, why ?

no_man_cse wrote: [ delete comment ]

5/18/2010

It is very helpful to understand wimax

robinmangla111 wrote: [ delete comment ]

1/20/2011

how to download it?

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