Aamir Habib

24 Questions 90 Answers 0 Followers

Questions related from Aamir Habib

What is channel hardening in Massive MIMO?. Please explain in details?

What is channel hardening in Massive MIMO?. Please explain in details? I need to understand why it is called hardening. Also why does this phenomenon happen. what effect does it have on system.

15 January 2017 5,204 8 View

Why pilot estimation length for TDD is independent of antenna elements as compared to FDD mode in Massive Mimo?

Channel estimation time for fdd is longer than tdd due to non reciprocity of channels in fdd. Why then does this time depends on number of antennas and independent of antennas for tdd.

26 November 2016 1,510 6 View

What is SOMA for 4.5G?

What is the SOMA(Semi orthogonal multiple access) considered for 4.5 G wireless networks.

21 February 2015 8,700 6 View

Would network densification in future 5G help in reducing cost or other way round? How can the cost be reduced?

Solving the capacity and data rate challenges with network densification could be very expensive in terms of equipment, maintenance, and operations in future 5G. In LTE and LTE-A most of the...

10 January 2015 2,176 3 View

What is the difference between QoS and QoE? What effect would QoE have on future 5G network design?

With respect to future 5G networks which quantity would be more important with respect to the end user service. Is it Quality of Service or Quality of Experience?

10 January 2015 1,167 1 View

What is the best coding based antenna selection for MIMO?

What benefits can we get if we select an antenna on the output of convolution coding and transmit the data on the selected antenna? This scheme is similar to a new scheme called spatial...

22 May 2014 1,968 3 View

Converting air humidity to safe drinking water?

Can anyone tell me the methods of converting water in the air into water which can be used for drinking.

05 May 2014 4,566 12 View

What are the benefits of QuaDRiGa channel models and how do they compare to existing COST models?

QuaDRiGa (QUAsi Deterministic Radio channel GenerAtor). Is it possible to apply QuaDRiGa channel models for simulating massive MIMO.

31 March 2014 5,451 3 View

Super high sampling rate ADC/DAC for 5G networks - any thoughts?

Until now nothing specific is formally defined for 5G requirement, I think it will be highly probable that the system bandwidth will get extended to at least a couple of hundreds MHz. There will...

21 March 2014 9,377 2 View

Adaptive filter applications with wavelet transforms?

Can wavelet transforms be applied to adaptive filter applications like linear prediction, echo cancellation, equalization, channel estimation etc?

19 March 2014 7,982 3 View

What are the most appropriate pilot coordination techniques?

The pilot resources within a cell are orthogonal, but pilot signals suffer from inter-cell interference in multicellular systems. Could anyone suggest a model to reduce pilot contamination?

01 March 2014 8,627 2 View

What is an electromagnetic lens? How could it be useful for wireless communications?

Can it be used to focus radiation from antenna to a specific direction? So far I have only found a paper regarding the application of this. Electromagnetic Lens-focusing Antenna Enabled Massive MIMO

13 February 2014 3,982 4 View

Channel models for massive MIMO?

What would be the channel models for future collocated massive MIMO systems. Should it be the same old MIMO channel models with correlation matrix or something else.

10 February 2014 4,895 1 View

What is a precoder design for Spatial modulation based MIMO?

How could be the precoder matrix be designed for spatial modulation transmitter and receiver.

09 February 2014 6,647 1 View

Can the output of a trellis encoder be used to select a subset of antennas to transmit data?

Antenna subset selection is a techniques in which we have less number of RF chains compared to the total number of antennas. Depending on the channel statistics best possible antennas are selected...

09 February 2014 9,979 1 View

What is the best method for efficient channel estimation with single- RF transmitter?

Done via a single transmit antenna (like in spatial modulation) with minimum number of rx antennas.

09 February 2014 8,106 1 View

What is Non Orthogonal Multiple Access (NOMA) for wireless communications?

Please explain NOMA and its potential use in 5G networks.

26 January 2014 2,364 19 View

What are the major differences between OFDMA and FBMC?

Can someone explain the advantages of using FBMC (Filter Bank Multicarrier) over OFDMA?

26 January 2014 1,163 4 View

What could be the killer applications for 60GHz millimeter future communications?

What do you think the killer application will be for 60GHz and frequencies above that? Wireless uncompressed video? Wireless Gigabit Ethernet for general networking around e.g. a conference...

22 January 2014 4,611 1 View

What are the research challenges of implementing millimeter waves (>60GHz) for 5G networks?

Would it be easier to implement this on handheld devices with augmentation of very large MIMO techniques?

18 January 2014 7,227 7 View

Is their any crude method for MIMO Antenna Subset Selection without first estimating the channel?

Before selecting the best antennas in MIMO, the channels from all antennas are measured/estimated. Definitely if the number of antennas increase with comparatively less number of RF chains, the...

18 January 2014 703 1 View

Extension of USRP boards with multiple antennas?

Currently the USRP I am using for my work can be equipped with 2 RF daughter boards so that you can connect 2 antennas. How can I extend this to more antennas? Can I use the technique of antenna...

16 January 2014 7,845 3 View

How to decode a signal with quite low SNR and in the presence of Doppler shift?

I need some MATLAB code to demodulate the data I have which is BPSK modulated. MAC layer protocol of this data is AX25 UI. BPSK baud rate is 1200bps. I have a good quality frame of this data in a...

07 January 2014 3,069 4 View

Is it possible to use LED lights for indoor localization?

WiFi signals, GSM, and ultrasound signals can be used for indoor LBS. Is it possible to use LED's already installed in an indoor environment for localization purposes. What could be the various...

03 November 2013 5,859 4 View