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# 802 11a

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88 Threads found on edaboard.com: 802 11a

## OFDM sub-carriers data: conjugate or independt?

in 802.11a, 48 sub-carriers are used to transmit data, and they are not carrying conjugate data on index like sub-carrier(x) and sub-carrier(N-x). also in some thsis I come across designs that transmit conjugate data on sub-carriers that are symmetric around the FFT size N, which results in waste of half the bandwidth. But the method outputs rea

## smallest possible transmission duration for 802.11 standards and Bluetooth, Zigbee, Z

What is the minimum possible transmission duration for the following transmission standards: 802.11a, 802.11b, 802.11g, 802.11n, Bluetooth (various types), Zigbee (various modes), Zwave I think that for 1SSID beacon that 802.11a and 802.11g are 1.52ms (...)

## 802.11a long traning preambles

c = 1+1i; Ws = zeros( 1, 64 ); S = sqrt(13/6)*; Ws(7:59) = S; xs = ifft( fftshift(Ws) ); As from above, how to do cyclic extension of xs to get 160 samples? Moreover; generate the 802.11a long preamble in matlab

## 802.11a vs 8082.11n occupied bandwidth

Hi all, straightforward question: why is it that 802.11n signals occupy more bandwidth than 802.11a/g signals? thanks, Aaron

## Req: 802.11a Implementation

Hi, I am looking for 802.11a basic Implementation. Is there any open 802.11a Implementation in vhdl or verilog? Thanks

## Scrambler in IEEE 802.11 a

A length-127 frame synchronous scrambler in IEEE 802.11a uses the following generator polynomial \$\$G(D)= D^7+D^4+1\$\$ If the all ones initial state is used, what is the 127 bit sequence generated by the scrambler? Thank you!

## OFDM Normailzation Problem

In 802.11a Standard, the short preamble is defined as sqrt(13/6)*ifft( How does this sq

## channel equalizer for a wireless OFDM using xilinx system generator

hello everyone, i am a student and got a project for "implementation of a channel equalizer for a wireless OFDM according to the IEEE 802.11a and Hiperlan/2 standard." i dont have knowledge about system level design environments for DSPs into FPGAs..,what i have is this ieee paper and nothing else, i was unable to gain knowledge on internet:

## RF receiver for wireless 802.11a

Hi I have to design a receiver to follow the attached set of specifications. Can somebody tell me for which receiver I should go for considering these specs and why?

## performance evaluation of 802.11g and 802.11a in Simulink

What parameters have to be changed for the two models to be distinguished from one another?? I have downloaded the WLAN files from and 802.11a from . On simulating both the files the outputs are the same in ter

## What kind of issues can come from unsymmetrical sidelobe structure of WLAN spectrum?

Hi all, What kind of issues can result in unsymmetrical sidelobes structure of the wlan (like 802.11a) spectrum? Thanks,

## MC CDMA channel estimation (CDMA and OFDM)

hi i am working on MC-CDMA channel estimation cdma + OFDM(802.11a) i try two types of channel estimation : Block type and Comb type i am using MATLAB built in function (rayleighchan) more specificlly (stdchan) as follow: bitrate = 20000000; % Bit Rate ts

## Can you clarify these 2 sentences about "pilot carriers" for me.

Hi This is a very good question: Please see my comments below QN:In the design of most OFDM systems before the zero padding there is an insertion of a 'zero' in the middle of the data carriers, why? ANS: I am taking reference of 802.11a for your answer. 1. Typically OFDM bandwidth is 20MHz and (10MHz both side). 2. Say

## data rate in 802.11 a ?

data rate in 802.11a is 18 mbps what does this specify? why no of sub carriers(52) is not equal to FFT size(64)? what for pilot carriers used? what is 3db bandwidth in ofdm? what is its importece?

## [Help] + OFDM definition in 802.11a

I need the OFDM definition in 802.11a, where can i find it? thank u!

## Long training symbol in WLAN 802.11n for channel estimation

Legacy Short Training Field (L-STF) The legacy short training OFDM symbol is identical to the 802.11a short training OFDM symbol. The L-STF is BPSK modulated at 6 Mbps. It contains no channel coding, and is not scrambled. The L-STF has a period of 0.8 ?s. The entire short training field includes ten such periods, with a total duration of 8 ?s. Leg

## Difference between WIFI and WLAN

Wi-Fi stands for Wireless fidelity, it is a gendral term used to call 802.11a/b/g. WLAN stands for all 802.11 stands, it includes a/b/g/d/h/j/i.

## Help with WLAN 802.11g physical layer (OFDM) simulation using Simulink

802.11a Frequency- 5 GHz Typical Data Rate - 23 Mbit/s Max Data rate ? 54 Mbit/s Range ? 115 feet 802.11g Frequency - 2.4 GHz Typical Data Rate ? 19 Mbit/s Max Data rate - 54 Mbit/s Range ? 125 feet but let me give ans asnswer for 802.11b to 802.11g

## Simulation measure for a wlan system...

I am working on a simulator for the 802.11a standard. The last few weeks some channel estimation methods has been implemented and at this moment in time I am about to evaluate them. PER(packet error rate) is the performance measure to be used. By googling it seems like some people prefer to plot PER vs SNR(signal to noise ratio), while other peopl

Most of the 802.11a/b/g/n transceiver provide RSSI signal for baseband and MAC chip. Why BB/MAC chip need this signal? What will BB/MAC do with this RSSI signal? When will the BB/MAC sample the RSSI value? Regards, HM

## Original 802.11 FHSS 1Mbps still alive?

Yes, most of the actual 802.11 systems support 1Mbps. Actually when a 802.11 system is doing a frequency band scanning this is done at lowest data rate, to get the lowest noise floor.

## DC offset calibration time

In 802.11a/b/g WLAN transceiver direct convertion TX/RX are commonly used. Direct conversion system needs DC offset calibration and LO leakage and I/Q imbalance calibration to ensure the transceiver performance. Some of these calibrations will be done when power-up. Some of them will be done in each transmite or receiver frame. Can anyone tell me w

## What's turbo mode of 802.11a/b/g?

Hi, What's turbo mode of 802.11a/b/g? Any paper related on this? Regards, hmsheng

## LANforge WiFIRE 802.11a/b/g software

Hi, any info on LANforge WiFIRE 802.11a/b/g software.? pls. share

## Design of filter for 5 Ghz voice transmission

Please give more information. Building Filter around 5Ghz is entering into the black magic of RF. What do you want to filter and for what purpose? I am guessing you are wanting to use Wifi 802.11a, is this correct? Is the filter for ACLR? Combining / Duplexing TX and RX?

## IEEE 802.11 simulink ofdm model

Hi, all of you. Now I'm reading the Standard IEEE 802.11a. But I could not understand the details in the protocol. I wonder if some one has IEEE 802.11 simulink ofdm model? would you please share it ot me?That would be a great help to me. I really appreciate for your help. Thanks again.

Hi, I have designed IEEE 802.11a model using simulink. Now I want to try different equalizers provided in Simulink to check the performance of the system under multipath channel model. I believe that these equalizers expect complex input (signal constellation vector) for comparison. I am little confused here. How can I use (...)

## Design the 802.11a baseband tranceiver module using FPGA

I begin to design the 802.11a baseband module using FPGA. But I have not any experience about the design process. Could you comment me some documents and resource to start doing the design? Thank you very much

## ieee 802.11a parameters..

Hi! I need the list of parameters of ieee 802.11a. And one issue which I don't understand that how many users can send the data at the time in WiFi(802.11) or WiMAX(802.16d)? pls example thanks!

A better way to visually understanding is to view the webinars on creating a simulink model of IEEE 802.11a by using real time is a step by step quite helpful

## OFDM Symbol overlapping in 802.11a

Hi all, I am trying to simulate the wifi 802.11a, and i have a little matter, can any one tell me why while the OFDM symbols are appended there is always an overlapping and sum of the last time sample with the first sample of the next symbol, thanks in advance bets regards

## Where IEEE 802.11 Standard Use

IEEE 802.11 and some supplements are downloadable at no charge from IEEE

## How I can calculate Eb/N0 with ofdm system?

Hello I am simulink on 802.11a that is in math work to convert to 802.11p.But I do not know how I can calculate Eb/N0 with ofdm systam and cycle prefix and pilot and coding also what is theorical curve for that.I wiil be happy if some one ask my question

## Quartus II Support for Modelsim 5.7g ?

Hello all ... I am using Altera's FFT V 7.2 (FFT Megacore Function) in my project 'PHY Layer Designing of 802.11a Transmitter'. While trying to simulte the FFT Core in modelsim 5.7g (Through TCL Script) using the same approach as mentioned in the guide of 'FFT MegaCore', the following error comes, { # Model Technology ModelSim SE vlog 5.7

## Problem in FPGA Designing of 802.11a Transmitter

Hello all ... Im working on the specified project for the past 4 months as my first HDL Project n im having a difficulty in deciding the format suitable for representing the floating point values of I n Q in the mapper module. The mapper maps the bits as per the constellation table n the values after multiplication with the normalization fact

## Viterbi decoding of 16-QAM

IEEE 802.11a WLAN model: Screenshot:

## HELP: Matching dual band antenna

Hi all, I'm matching a dual band antenna (802.11a/b/g) using matching circuits now. Does anyone know how to match the antenna with dual frequecy bands? And does anyone have any reference of articles or books to discuss how to match an antenna using L-network or pi-network? I'm very appreciate for your help. Thanks in advance.

## Any book helpful in designing h/w of Wi-Fi OFDM PHY layer

hello friends .. im in initial stage of desiging h/w of 802.11a complaint PHY layer .. and need some reference book dedicated toward hardware designing of OFDM PHY .. or any paper / document would equally be useful .. waiting for a reply .. Regards Syed Shaheer Javaid ..

## Any one in PHY implementation of 802.11a

Hello all .. Im designing hardware of PHY layer of Wi-Fi (transmitter part only) and after going through the standard and related hardware I still hav some queries un-answered . My first problem deals with the input and output ports of the PHY layer i.e. if i want to represent my whole hardware design in a BLACK BOX form .. what will be the

## help needed ADS_what should be the IF for dual band

hello every one, I am doing sytem level designing(in ADS) of dual standard LOW IF receiver(Bluetooth+WLAN 802.11a),coulld you pls suggest me what shoult be my IF for the design,and which topology would be good. thnaks in advance vivek1214

## help in ADS_designing of dual band receiver what shoul be IF

hello every one, I am doing sytem level designing(in ADS) of dual standard LOW IF receiver(Bluetooth+WLAN 802.11a),coulld you pls suggest me what shoult be my IF for the design,and which topology would be good. thnaks in advance vivek1214

## Let's talk about the transceiver in WLAN

We will design a transceiver in WLAN we should simulate the system architecture in Matlab or ADS at first to evaluate the parameters of the all blocks(LNA,MIXER,LPF,etc),such as gain,p-1db,IIP3,NF,etc.If we get the parameters,we can design circuits of the blocks in CADENCE.But I am confused now,how can i model the blocks in Matlab or A

## Does IEEE 802.11a protocol operate on network or physical layer?

can anyone tell me whether ieee 802.11a protocol operates on network layer or physical layer? and why that layer only?

## Passband ripple for IEEE 802.11a

Hi all, I can't find anything in IEEE 802.11a talking about the maximum passband ripple. Can anybody help?

## FCC band-edge test for 802.11b, 802.11g and 802.11a

Can anyone tell me the FCC band-edge test spec. for 802.11b, 802.11g and 802.11a and how to slove the band-edge problem? Because my AP Router failed in this certification item and I still can not find way to solve this problem. Best Regard Thanks

## Compensation schemes in wireless networks

you are progressing with what wireless technologies 802.11a/b/g or wimax r u talking , abt front end design thanks n regarsd eswar

## Whether 5GHz UNN band is using in India or not?

Hi friends, I want to know whether in India we are using 5GHz UNN band for 802.11a(OFDM) or still we are using 2.4GHz range frequency ? Thanks in advance, Goud

## A silly wi-fi question

In Wi-Fi g or 802.11a version. the 802.11a in particulator can go from 33Ghz go to 64Ghz usa regulatory. Now more frequency is more power and more unhealthy? thanks

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