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Recent content by rmreddy

  1. R

    multi-level C structure interface from matlab to C dll

    Yes, i want to create an array of structure of type 'strucA'. something like this: simConfig->a1[0].e simConfig->a1[0].f simConfig->a1[0].b1.g simConfig->a1[0].b1.h
  2. R

    multi-level C structure interface from matlab to C dll

    Hi, I am trying to link a C dll and run from matlab environment. THe C code has data structure which is of multi-level hierarchy. The c structure looks like this: typedef struct structureB { unsigned short int g; unsigned short int h; float ii; }strucB; typedef struct...
  3. R

    How to transmit the very high data rate ( > 120Mbps)?

    It would be ideal to know what is the application you are intended to workup this system... It plays a major role in deciding on system architecture and framework
  4. R

    Error Correcting Capability of Turbo codes???

    hi, As far as i know there is nothing like error detection capabilities of Turbo codes. Convolutional codes which includes turbo codes fall under error correction codes as compared to Cyclic redundancy Check (CRC) which falls under error detection codes. the basic difference is self-...
  5. R

    Information about parity bits

    turbo extrinsic hi, i guess the TI L1 layer library has Turbo Decoder implementation for WimaX duo-binary PCCC.
  6. R

    Math operations on Q format data

    hello, could anyone tell how to check whether an underflow has occured or not in subtraction or division of fixed point data ....
  7. R

    Floating point vs. Fixed Point Computations

    hi andre, i want data to have same values as it had previously before conversion. typecasting actually truncates a decimal value to nearest integer value which i dont want to happen. i need conversion of floating point data say 0.7071 into Qformat say Q10 like 724 ( 2^10 * 0.7071 = 724 ) and...
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    Math operations on Q format data

    hi all, i need good reference material or C code that performs arithmetic operations like addition, subtraction, multiplication and division on signed Q10 or Q15 data format considering issues like overflow, underflow, trunctation and roudn-off that may arise during operations .... seeking ur...
  9. R

    Floating point vs. Fixed Point Computations

    hi, its seems that lot of guys here have knowledge abt floating point to fixed point conversion and arihtmetic operations on fixed point data. it will be helpful if anyone could share some material relating to floating to fixed point conversion and what are the criteria that sholud be taken...
  10. R

    Interleaver for Turbo decoder

    hi, interleaver do not scramble the data. scrambler or randomizer is a different module that is carried out to reduce PAPR of a signal, whereas interleaving is carried out to make the code word appear as random ( because shanon has stated in his channel capacity theorem that a code word that is...
  11. R

    Iterative decoding....

    first of all i m bit shocked to read that u have implemented iterative decoding on MATLAB. because it involves lot of memory access, indirections and pointers are unavoidable in the implementation of decoding. i wonder to wat extent the code is correct. recently i have developed turbo encoder...
  12. R

    frequency synchronization of OFDM wireless systems

    hi all, it will be of great help if anyone can share their knowledge or material on frequency synchronization of OFDM wireless systems. i will be in a better position if i can get MATLAB simulation of the same.
  13. R

    HW implementation and simulation of PHY/MAC layers of WiMAX

    wimax phy implementation dsp to be frank, its highly challenging and difficult and one can say impossible task to take up implementation on and simulation of PHY/WiMax layers as a graduation project. man, across world thousands of engineers are working on both the layers independently with...
  14. R

    hard and soft demappers

    soft demapper hi all, can anyone explain me whats the differnece between hard and soft demappers. which has the better performance and lower BER.
  15. R

    is it possible to simulate MAC layer of wimax in matlab?

    wimax mac layer testing type no ways man... no ay u can implement wimax MAC on matlab ... there are too many functional modules, sub-modules, modular functions, supporting functions too much of memory constraints, handling pointers, structures, enumerators are difficult in MATLAB ...

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