However, it is very difficult to obtain the accurate channel coefficients in each symbol duration for the rapidly time-varying channels.
However, for equivalent altitude datasets, the differences between MF7 and CHAOS-4 mainly lie in the way the different models deal with source field separation and, more specifically, with the rapidly time-varying external fields.
Specifically, relying on a basis expansion model (BEM) of the rapidly time-varying channel impulse response, we derive the canonical frequency-domain representation of the minimal norm LTV-ZF equalizer, which allows one to implement it as a parallel bank of linear time-invariant filters having, as input signals, different frequency-shift (FRESH) versions of the received data.
Therefore, shorter SSs due to fragmentation of source block has better PER performance because the preamble and pilot bits that are used to estimate the channel state information are sufficient to cater the rapidly time-varying multipath channel in a highway environment.
The first group of five papers deal with the rapidly time-varying channel modeling and estimation, the next group of seven papers address data transmission under high mobility scenarios, and the last group of six papers are related to fast handover schemes, location prediction, etc.
In order to study adaptive MQAM/OFDM systems, one should investigate first the forms of the SNR and BER expressions in the presence of very rapidly time varying channels.
In an editorial that appears on Sunday, The Des Moines Register describes Mr. Bradley as a visionary leader "whose ideas and approach to governing most closely match the needs" of the rapidly changing times.
I have observed the obvious frustrations that befall any aging behemoth to keep up with the rapidly changing times.
The corresponding highly nonlinear and rapidly time-varying dynamics constitute a significant challenge for the autopilot design.
You literally look at it for 10 seconds (depending upon how long you have been waiting for it -- the longer that is, the more rapidly the time decreases), and then you stuff it in your mouth.
His legislation is facing an uphill fight in the Senate, where it is imperiled by the rapidly diminishing floor time before lawmakers become distracted by the midterm elections.
