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Can LDPC and Bit-loaded OFDM be combined efficiently?

Hi guys I have a question about the use of LDPC codes and different bit- loadings which naturally occur as part of a large number of OFDM systems (802.16e, for example). I have seem a few methods...

3D coherence function

I am trying to find the correlation between two EEG signals as a function of their frequencies: Cxy (fx, fy). MATLAB has something similiar in the signal processing toolbox: the magnitude squar...

Digital Up Conversion - low signal power and SNR

Hi, Signal in digital domain: Centre at 10Mhz, with bandwidth of 10Mhz. The signal is sampled by a DAC at the rate of 80Mhz. Analog output: Fundamental at 10Mhz and many images following tha...

DTMF ENERGY LEVELS [2 articles]

Hi all, I am new to Goertzel algorithm so having some basic doubts about its implementation. As per thr standatd Q.24 (AT&T) Power levels per frequency = 0 to -25 dBm; what does this actually mea...

AWGN Noise with OFDM Signal [2 articles]

Hi, I'm simulating an OFDM system with Multipath and AWGN channels. One thing that i'm observing is that whenever I simulate the system on baseband the AWGN command adds almost the correct noise but w...

How to accurately calculate the instantaneous frequency for a clip of speech [5 articles]

hi,every one; How to accurately calculate the instantaneous frequency for a clip of speech? and with high frequcy resolution?? for example: [d,sr] = wavread('xx.wav'); % a slip of sound;...

Thanks

Thanks for providing valueable information. i am clear now ...

Reading FM sample File [4 articles]

Hi, All I have downloaded nbfm.dat from web which contains FM voice communication centered at 5.75 Mhz, sampled at 20 mega samples/s stored in 2's complement, little endian integer format. The file ...

frequency resolution issue [20 articles]

Hi all,I am a newer in DSP. I have a frequency resolution problem, need your suggestions and comments. My problem depends on frequency resolution. Basically I need the frequency resolution around 0...

ANC with wrong reference signal [6 articles]

Hi Guys, I work with a ANC for my studies, and I have the following problem: Algorithm: FxLMS with two weight factors scaling sine and cosine oscillators in order to synthesize an 'anti-vibrati...