How do I design a loop filter of DPLL in OFDM system?

Hi all, I am designing a loop filter of DPLL in 802.11ac OFDM system. The DPLL tracking is achieved by pilot symbols inserted into OFDM symbols. Importantly, the coefficients of loop filter...

01 February 2016 3,754 3 View

Does anyone know how to compute the soft output (LLR) of MIMO ZF-SIC/MMSE-SIC detector?

09 October 2015 224 4 View

How can I simulate the algorithm for a IEEE802.11ac PHY layer that can optimally reflect the performance of a real-circuit implementation?

I am working for a semi-conductor company. Now, my assignment is to design IEEE802.11ac PHY layer algorithm. However, the situation of theoretical simulation is very different from that of...

04 May 2015 828 8 View

How do you determine the minimum training frames for MIMO channel estimation over flat fading channel?

The reference I've read indicates that the minimum training frames should be greater or equal to the number of transmitter antennas. Herein, the training frames denote that S = [s1, s2, s3, ......

10 November 2014 332 7 View

Can anyone help with DS-CDMA over multipath?

DS-CDMA is divided into uplink and downlink communications. As for uplink, the users suffer from different channel impulse responses (CIRs). How the receiver estimates these CIRs and cancel it? As...

08 September 2014 9,342 9 View

How can I choose the length and decision delay of an equaliser trained by linear RLS or LMS in a simple BPSK modulation system ?

I am modelling an equaliser trained by linear RLS and LMS in a simple BPSK modulation system. I found a problem that, the short length of equaliser, (e.g. equal to length of CIR), is not able to...

08 September 2014 6,659 12 View

Does anyone know about carrier frequency offset estimation for DS-CDMA?

As for training sequence, we can use the known simples to estimate the channel and then cancel ISI. However, in reality, there are not only frequency-selective channel but also carrier frequency...

08 September 2014 7,232 12 View

Does anyone know how to determine the value of step size in LMS algorithm.?

I wanna to establish a inverse modelling to get a equalizer to combat the multipath channel. However, I found a problem that the training of LMS algorithm is very unstable under the Rayleigh...

07 August 2014 3,636 19 View

Can anyone give me some advice on correlation detection for a Complementary Code Key (CCK) modulation scheme?

My question is about CCK modulation scheme in IEEE 802.11b standard. CCK uses 8 complex polyphase complementary codes to represent a particular 8-bit sequence and achieve 8 chips per symbol. In...

07 August 2014 6,328 4 View

PBCC modulation in IEEE 802.11b - can anyone help?

PBCC is an optional modulation scheme using a binary convolutional coding with 64-state binary convolutional code (BCC) and cover sequence. If the cover sequence is 0, one constellation is used....

07 August 2014 6,003 2 View

What is the most Operating System (OS) which can be INSTALL on Tiny hard devices like Raspberry Pi (RPi) hardware ?

I'm targeting to deploy a mesh network and manually configure MANET routing protocols. I'm preparing scenarios, architectures, and hard devices needed to do that. Are there some step-by-step...

03 March 2021 1,931 5 View

Is there a powerful system for the security of the systems distributed on IoT systems?

Is there a powerful system for the security of the systems distributed on IoT systems?

02 March 2021 3,858 10 View

How can I integrate a routing protocol in a tiny device (e.g. Raspberry Pi)?

Hi Community, I'm facing the issue of integration/compiling a new routing protocol in a WSN simulator. The final goal is to successfully add, configure this routing protocol in hardware devices...

01 March 2021 9,332 6 View

How to choose ANN number of hidden layers and nodes?

Hello, Could you please share any interesting research explaining how to choose the number of hidden layers and nodes per layer in case of regression problems using ANN? Thank you, any help would...

01 March 2021 6,200 3 View

How to improve and implement WBAN MAC and Radio modules under Castalia 3.2 ?

Hello researchers, Hello Castalia3.2 researchers I am a beginner with Castalia, I work on optimization of RFID systems used in wireless body networks. I simulated a WBAN with 10 nodes and one...

28 February 2021 400 1 View

How to sample data to increase presence of solar panels in the images?

I am working on creating deep neural network on geospatial dataset and wanted to know how to do the sampling so that I can increase the presence of solar panels in the images. I cannot use entire...

25 February 2021 3,936 6 View

Satellite orbit estimation using Recurrent Neural Network - what should I use?

Hello, I am a master's student studying in Yonsei Univeristy, Korea. I am trying to estimate the state of satellite, using Neural Network. Below is a simple flow of my study. 1. Train (t0 ~ t1)...

23 February 2021 6,383 3 View

Any methods to train a neural network with random (stochastic) and non-measurable variable?

Dear scholars, I was wondering if there are any scientific methods to train a neural network or ANFIS when one of the input variables is stochastic (random) and more importantly non-measurable?...

17 February 2021 1,909 3 View

Does anyone know what are the pros and cons for using autoencoders instead of CNNs for features extraction in neural networks?

Are there papers that talk about the possible advantages and disadvantages of using autoencoders instead of CNNs for feature extraction in neural network?

15 February 2021 6,952 3 View

What are the popular techniques for pre-processing measurement data in Smart Grid/Power System?

The data collected from various measurement devices often contains erroneous values - such as noise, missing values, etc. What are the popular techniques for pre-processing measurement data in...

14 February 2021 4,642 2 View