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sdr/fcch: Add equation for the up/down/dual chirps doc 

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2011-10-19 08:31:18 +02:00
parent 93848d25af
commit 63e9d84adb
1 changed files with 18 additions and 4 deletions
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22
src/sdr/fcch.c
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@ -49,7 +49,13 @@
* \param[in] up_down Selects chirp direction (0=down 1=up)
* \returns A newly allocated complex vector containing the chirp
*
* The length will be 117 * sps
* Up-Chirp: \f$\frac{\sqrt{2}}{2}\cdot e^{j\left(
* 0.64\pi\left(t-\frac{T}{2}\right)^2/T^2\right)}\f$
*
* Down-Chirp: \f$\frac{\sqrt{2}}{2}\cdot e^{-j\left(
* 0.64\pi\left(t-\frac{T}{2}\right)^2/T^2\right)}\f$
*
* The length will be 117 * sps
*/
static struct osmo_cxvec *
gmr1_sdr_fcch_gen_up_down_chirp(int sps, int up_down)
@ -85,7 +91,10 @@ gmr1_sdr_fcch_gen_up_down_chirp(int sps, int up_down)
* \param[in] sps Oversampling rate
* \returns A newly allocated complex vector containing the chirp
*
* The length will be 117 * sps
* \f$\frac{\sqrt{2}}{2}\cdot e^{j\left(
* 0.64\pi\left(t-\frac{T}{2}\right)^2/T^2\right)}\f$
*
* The length will be 117 * sps
*/
static struct osmo_cxvec *
gmr1_sdr_fcch_gen_up_chirp(int sps)
@ -97,7 +106,10 @@ gmr1_sdr_fcch_gen_up_chirp(int sps)
* \param[in] sps Oversampling rate
* \returns A newly allocated complex vector containing the chirp
*
* The length will be 117 * sps
* \f$\frac{\sqrt{2}}{2}\cdot e^{-j\left(
* 0.64\pi\left(t-\frac{T}{2}\right)^2/T^2\right)}\f$
*
* The length will be 117 * sps
*/
static struct osmo_cxvec *
gmr1_sdr_fcch_gen_down_chirp(int sps)
@ -109,7 +121,9 @@ gmr1_sdr_fcch_gen_down_chirp(int sps)
* \param[in] sps Oversampling rate
* \returns A newly allocated complex vector containing the dual chirp
*
* The length will be 117 * sps. The vector is also 'real only'.
* \f$\sqrt{2}\cdot\cos\left(0.64\pi\left(t-\frac{T}{2}\right)^2/\;T^2\right)\f$
*
* The length will be 117 * sps. The vector is also 'real only'.
*/
static struct osmo_cxvec *
gmr1_sdr_fcch_gen_dual_chirp(int sps)