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Hello to everyone,
I am currently working on a MATLAB project regarding the implementation of different adapting modulaction and coding (AMC) algorithms for a mobile TDMA communication system based on an existing Matlab simulation tool developed in cooparation with my university and a company...
h is not a channel, it is a vector (note that the size is 1 x 16). As you know, the inner product of a complex-valued vector h with its adjoint (conjugate transpose) hH equals to its squared norm. The channel is assumed to be known I guess. If it is that the case you do not need the expectation...
Ok, I will try to explain it differently.
The local loop is the connection between the customer and the telco. Usually it is one or two telephone cables. Each telephone cable consists of two copper wires.
ISDN is a fully digital network, as the name implies (Integrated Services Digital...
If I understand your question, you want to understand the physical meaning of complex-valued quantities, not just in DFT, but in general.
A mathematical model is a representation of a physical phenomenon or process, and idealized version of reality with emphasis on some characteristics of it...
What means ideal channel? Well, the output of an ideal channel may have some time delay compared with the input, and it may have a different amplitude than the input (just a scale change), but otherwise it must have the same shape as the input (i.e., no distortion). In other words, an ideal...
It's been a long time since this has posted, but since it has not been answered yet, I decided to answer it.
Well, PCM it is a baseband modulation scheme (also known as pulse modulation), that is, simply stated, the transmitted signals are pulses, whereas PSK, FSK etc. are examples of bandpass...
In dial-up internet access, the channel is analog (i.e., the telephone 2-wire cable). The same bandwidth with Plain Old Telephone Service (POTS), that is, analog telephony, is used, which is 3.1 kHz (spectrum from 300 Hz up to 3.4 kHz). It turns out from the Shannon-Hartley law,
C=Blog2(1+S/N)...
OFDMA is an extension of OFDM from a modulation method to a multiple-access method, and it is used for the same reasons that OFDM is used, i.e., mainly provides high data rate and at the same time eliminates ISI without the need of complex channel equalizers and channel estimation - something...
It is often the case when the receiver requires knowledge of the channel impulse response (CIR) - e.g., the equalizer needs this channel state information (CSI) in order to remove the intersymbol interference (ISI). This knowledge is usually provided by a separate channel estimator at the...
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