Implementing QPSK modulator and demodulator in MATLAB
| Date | Contributor | Description | Rating |
|---|---|---|---|
| 19 Mar 2012 | mmmaaa bbb | 5 |
|
| 21 Oct 2010 | Mathuranathan Viswanathan |
In digital modulation techniques a set of basis functions are chosen for a particular modulation scheme.Generally the basis functions are orthogonal to each other. Basis functions can be derived using 'Gram Schmidt orthogonalization' procedure.Once the basis function are chosen, any vector in the signal space can be represented as a linear combination of the basis functions. In Quadrature Phase Shift Keying (QPSK) two sinusoids (sin and cos) are taken as basis functions for modulation. Modulation is achieved by varying thephase of the basis functions depending on the message symbols. In QPSK, modulation is symbol based,where one symbol contains 2 bits. |
5 |
| Tag | Applied By | Date/Time |
|---|---|---|
| demodulation | Hengda Ding | 7 Jan 2013 at 9:13am |
| qpsk | Paul | 17 Nov 2012 at 5:55pm |
| pi/4 qpsk | Farheen fauziya | 7 Oct 2012 at 1:25am |
| qpsk | Farheen fauziya | 4 Oct 2012 at 6:01am |
| qpsk | wave1 | 28 Aug 2012 at 7:59am |
| qpsk | Hans Gram | 24 Apr 2012 at 4:53am |
| ber | Hans Gram | 24 Apr 2012 at 4:52am |
| basis function | Andrew | 12 Apr 2012 at 2:32am |
| qpsk | Vinay Sagar Deekonda | 24 Mar 2012 at 10:19pm |
| demodulation | BRT | 7 Mar 2012 at 4:00pm |
| basis function | abdul | 4 Mar 2012 at 8:19am |
| qpsk | Lemariey | 2 Feb 2012 at 6:50am |
| communications | Ofri | 7 Jan 2012 at 3:02pm |
| demodulation | ant1bball | 31 Dec 2011 at 8:53am |
| modulation | prayugo ardi wibowo | 28 Dec 2011 at 1:16am |
| qpsk | ahmad | 25 Dec 2011 at 2:20pm |
| modulation | Dung | 14 Dec 2011 at 10:37am |
| qpsk | A SH | 2 Dec 2011 at 3:21pm |
| pi/4-qpsk | naeem shaikh | 31 Oct 2011 at 3:53am |
| ber | via | 6 Oct 2011 at 10:28am |
| modulation | umesh | 25 Sep 2011 at 1:39pm |
| basis function | Muhammad Ali | 23 May 2011 at 12:26pm |
| qpsk | ahmd mmdoh | 21 May 2011 at 3:38am |
| simulation | Mervyn | 2 May 2011 at 8:52am |
| qpsk | A Quan | 27 Apr 2011 at 12:41am |
| demodulation | Robi Dahal | 7 Dec 2010 at 2:32pm |
| demodulation | younes elkhlifi | 27 Nov 2010 at 5:33am |
| basis function | NANDA kumar | 22 Oct 2010 at 8:05am |
| threshold detector | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| demodulation | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| modulation | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| constellation | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| phase shift | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| basis function | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| implementation | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| communications | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| simulation | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| signal processing | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| digital communication | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| pi/4-qpsk | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| pi/4 qpsk | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| eb/no | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| snr per bit | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| snr | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| ber | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |
| qpsk | Mathuranathan Viswanathan | 21 Oct 2010 at 11:21am |