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etha and theta are the loop's transfer function parameters. You can read the first chapter of any PLL book, I recomend Urlich Rohde's book. Usually when you design a PLL it has a loop filter. Ther order of this filter determines the order of the loop. I guess you have a second order loop and...
qam demodulation
Hi: Im working on the same kind of project for MS investigation. The objective is a multimode platform for CDMA and OFDM based systems. Im also using Xilinx System Generator.
Even if it is a difficult project you can get started with the simple things. Try to make your own...
Re: Capacity of Fading Channel through Mutal Information ???
In this paper you can find the penalty on capacity when a channel has correlated coeficients. Page 6 and so on. I've posted it on another link:
Re: QPSK in CDMA?
The last actualizacions for CDMA systems like HSPDA specify higher order modulations like 16QAM. This is what allows UMTS systems to raise the throughput.
However it doesnt mean it is better that QPSK (or that 8PSK is better that QPSK). The problem is that points in the...
Hi:
The QAM modulator receives the information from the channel and asume it is afected by noise. So for example if we use 4QAM, the symbols used to modulate the signals are +1,-1 for the I-channel and +1,-1 for the Q-channel. After the channel, we have the symbolos plus noise, so for example...
I found out a way of generating the I and Q symbols algorithmically with gray mapping. I've used it for QPSK and 16QAM. I will explain it for 16QAM. The following table lists the output symbols given the four input bits (Remember that we have to wait for 2 bits to generate a QPSK symbol and for...
Re: CTC in WiMax
If you have implemented convolutional codes you should first try to make a recursive encoder which is very easy (feed back one of the modulo 2 adders). Codes (3, [5 7]) can be a good start. Then you have to concatenate it in parallel with another encoder. Parallel concatenation...
pcb yagi antenna
I use sometimes 4nec2 simulator. It is free and easy to use. The problem is that you cant undo. Ive simulated uda-yagi antennas on that SW.
Mario
Re: modelling feeds
Can you explain a litlle bit more? I am simulating CPW feeds and what I do is to define the port exitation and before the sweep analisys I check the port field display. If the mode is fine then I continue with the simulation. Defining ports may be tricky, remember to define...
The wireless channel has a multipath propagation characteristic. The key concept these days is spacial diversity and it refers to how can we use the multipath nature of the channel to receive the signal through say: r separate antennas. The r signals can be used to improve de reception when...
CDMA stands for code division multiple acces. It started as a militar project but Qualcomm iniciated a standard for digital mobile telephony known as IS-95 or CDMAone (IS-95 and GSM are the mayor players on celular deployment today for 2G telephony). For 3G evolution UMTS/WCDMA (wideband CDMA)...
convolutional turbo encoder
If you understand convolutional coding you should try reading C. Berrou's paper, he proposed turbo codes explaining why they use recorsive systematic encoder and interleaving. Try some research on the MAP algorithm and the concept of soft output decoders...
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