Hello. I got these question while viewing old articles. Could anyone please answer next two ? 1. Under what conditions is the available...

Hello. I got these question while viewing old articles. Could anyone please answer next two ? 1. Under what conditions is the available bandwidth of a digital system Fs Hz instead of Fs/2 Hz? 2. What two PSK modulation orders differ exactly by a factor of two in spectral efficiency? Many thanks !

Hi, "3pi/8", "pi/4" are used in some modulation schemes. I find it is really difficult to pronounce it in English. Similar question...

Hi, "3pi/8", "pi/4" are used in some modulation schemes. I find it is really difficult to pronounce it in English. Similar question about 3.2^4. How do you spell them? Could you tell me that? Thanks in advance.

need help regarding how to identofy that signal is GMSK modulated ..plzz give advise in this regard.. ...

need help regarding how to identofy that signal is GMSK modulated ..plzz give advise in this regard.. regards, ravi.

Hello, I read in a paper that energy for synchronizers is embedded in excess bandwidth of modulation signal. What exactly does it mean? Can...

Hello, I read in a paper that energy for synchronizers is embedded in excess bandwidth of modulation signal. What exactly does it mean? Can someone please help in explaining this concept? Thanks.

Hi there, Can anyone explain why this code is not right for amplitude modulation vst? (steinberg kit) Trem= (1- fDepth) + fDepth * (sin...

Hi there, Can anyone explain why this code is not right for amplitude modulation vst? (steinberg kit) Trem= (1- fDepth) + fDepth * (sin ((2 * PI * 10)* getSampleRate())

what are orthogonal signals?? Why is CODFM modulation used for terrestrial digital TV? I can't find the correct info on the web. can anyone...

what are orthogonal signals?? Why is CODFM modulation used for terrestrial digital TV? I can't find the correct info on the web. can anyone help me?

I was just wondering if there is a standard modulation scheme known as BPSK-16. I've seen it as a configuration option on a device, and I'm...

I was just wondering if there is a standard modulation scheme known as BPSK-16. I've seen it as a configuration option on a device, and I'm wondering if there is a spec for it.

What is the estimated bandwidth using Carson's rule when your separation is 19.8 kHz, the baud rate 19.2 kBaud/s modulation is FSK, NRZ line...

What is the estimated bandwidth using Carson's rule when your separation is 19.8 kHz, the baud rate 19.2 kBaud/s modulation is FSK, NRZ line coding and the crystal tolerance is negligible? Thanks

I'm thinking about the following: We know that BPSK has a mutual-information capacity around 0 dB (some say, 0.2 dB by a different argument,...

I'm thinking about the following: We know that BPSK has a mutual-information capacity around 0 dB (some say, 0.2 dB by a different argument, but it's close), and that this is ... most would calculate, 1.2 dB off from the channel capacity. Does 2-MSK have the same capacity? Or is it somehow compromised by whatever small factor? (Yes, lame question, I should be able to convince myself ...

dunno if this is of any interest, but once in a while, even within the *same* discipline, you get these opposing (or at least...

dunno if this is of any interest, but once in a while, even within the *same* discipline, you get these opposing (or at least different) meanings for the same set of words or letters. like "modulate" or "modulation". what it means to communications engineers is a bit different than what it means to musicians. but in audio/music DSP, we run across both contexts. another is "sample" (sin...

Hi, In the document of GSM 05.01, it gives the average modulation rate: 1625 -------- = 270.83 kbit/s 6 My question is : How the...

Hi, In the document of GSM 05.01, it gives the average modulation rate: 1625 -------- = 270.83 kbit/s 6 My question is : How the 1625 and 6 are obtained? Could you tell me that? Thanks in advance

In 3GPP LTE, we use AMC (Adaptive Modulation and coding). It is well known that performance of AMC depends on the speed of UE. Is there any way...

In 3GPP LTE, we use AMC (Adaptive Modulation and coding). It is well known that performance of AMC depends on the speed of UE. Is there any way to track the speed of UE ?

For OFDM system with the sampling frequency of 50MHz and BPSK modulation scheme,what will be the data rate at physical layer? Will it...

For OFDM system with the sampling frequency of 50MHz and BPSK modulation scheme,what will be the data rate at physical layer? Will it be 50Mbits/second as well? Please help. Thanks.

i have a small doubt .. what do you mean by a estimate of a filter and estimate of a channel? And what is the use of modulation of a filter...

i have a small doubt .. what do you mean by a estimate of a filter and estimate of a channel? And what is the use of modulation of a filter with a DFT or cosine etc? Please help me geeks. .

With the wealth of knowledge sloshing around here, can someone point me to a reference/reading for generation of FM using sawtooth...

With the wealth of knowledge sloshing around here, can someone point me to a reference/reading for generation of FM using sawtooth pulses? That's all i have to go on, well, that, and the fact that there was a bandlimiting filter prior to the FM modulation and then translation to IF. Any suggestions? This is probably a common technique with a funny name. col

I just wanted to know how DMT reduces crosstalk in xDSL systems. Since the modulation is DMT based and DFT is used to modulate the careers . But...

I just wanted to know how DMT reduces crosstalk in xDSL systems. Since the modulation is DMT based and DFT is used to modulate the careers . But how it is effective in reducing the crosstalk as comapred to CAP/QAM.

Hi, Can anyone please explain me the difference between pi/4 QPSK and pi/4 DQPSK? Recently i came accross these 2 termilogies. If You have any...

Hi, Can anyone please explain me the difference between pi/4 QPSK and pi/4 DQPSK? Recently i came accross these 2 termilogies. If You have any good reference explaining these 2 Modulation types, can you please share the same?

Hello, I am new in OFDMA for 802.16, I wonder how can we calculate bit per symbol in wimax ? does this depnds on modulation and coding ?...

Hello, I am new in OFDMA for 802.16, I wonder how can we calculate bit per symbol in wimax ? does this depnds on modulation and coding ? supposing that we QPSK 3/4 ? how can I know the number of bit per symbol ? thanks, Aleen

Hi all, I have designed ssb modulator with HT in Matlab Simulink. The unwanted components (lower or higher) has attenuation 35dB. My...

Hi all, I have designed ssb modulator with HT in Matlab Simulink. The unwanted components (lower or higher) has attenuation 35dB. My question is can I get better results with this SSB method. Thank you in advance, Amir

I sat down today to get in a little bit of work over the weekend on a communications project I'm doing for a customer. The channel is not only...

I sat down today to get in a little bit of work over the weekend on a communications project I'm doing for a customer. The channel is not only highly dispersive, but I'm stuck with a legacy modulation method that does not cough up a non-correlated mix of symbols, and at any rate the system as a whole is used for feedback where you just can't throw away a bunch of time waiting for acquis...