Subject: [manet] 2:spectrum allocation

From: dgp <[email-masked]>
Date: Fri, 27 Oct 2006 02:10:19 -0700 (PDT)

i figured out something and putting to groups observation.

1. the main conflict was at usage of spectrum by modern cellular operators per channel when the base band is only audio (voice) type duplex in kbytes/sec data rate range.
the base band signal is a sinc signal (sin(x)/x) occupying some bandwidth near zero Hz. It is multiplied by pseudo-random noise type signal note the noise type is very important and the signal shall not have a pattern of any kind to have dominant frequencies in its own frequency spectrum (frequency representation of time domain signal). this 'known noise' is like spread over the wide band with equal -unequal components. THIS becomes the base band NOW. This noise signal is a logic 1/0 high bit rate 'code'. this code is used when audio base band is logic 1 and is inverted (logic 0 is negative, -ve * -ve = + ve and -ve * +ve = -ve) when base band is 0. so the relation of audio (Kbytes/sec) baseband and noise high bit rate signal is XNOR type. the multiplication in time domain is convolution in freq domain. the convolution of sinc (sin(x)/x) with spread spectrum noise is spread spectrum noise. i worked it out. So this spread spectrum is my base band (coded with pseudo-noise
 high data rate). It is obviously transmitted with high frequency carriers. 
At recievers the recieved baseband is deconvoluted by multiplying SAME random code used at transmitter. If you work out multiplication of same random codes generate logic 1 and opposite generate logic 0.(+ve * +ve or -ve * -ve = +ve, -ve * +ve or +ve * -ve = -ve) This same spectrum can be used for more than one base bands (voice). The advantage becomes evident if you imagine a dominant frequency (noise or another application transmitting at that frequencies) inside your spread spectrum. the multiplication of code even though seems to generate the original voice code of logic 1 and 0, the overlapped freq(noise or other application) is spread over speactrum after multiplication at reciever and can be filtered out by signal strength (after deconvolution) at reciever. So, you need high freq transmission for audio and also in a city if there are dominant channels present.
My observation was the used carrier of Mhz IS capable of transmitting higher bit rates than voice etc etc and so i thought it as wastage of spectrum and wanted method to allocate spectrum to low as well as high data rate channels present at mobile nodes. (sorry i deleted my original post, the idea is to have a (human) mobile node wearing many channels like sensor, data storage, communication (audio video), control/data etc which is getting channels allocate different spectrum slots from fixed base stations which have high end ring connectivity for data tapping and also for interzone (cells) data transfers for other applications, problem was as stated allocatation of spectrum to audio and sensor like kbytes/sec channels and video or data storage ports usb etc like mbytes/sec by base station))

I know this is not a MANET application but i am trying to find a way to develope routerless networks with homogeneous mobile nodes by seeing feasibility of such simplex type ad hoc networks with real applications in a building or plant. 

thank you for reply 
D'jay

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