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Re: [Discuss-gnuradio] Buffer too small for min_noutput_items (ofdm_carr

From: Aditya Dhananjay
Subject: Re: [Discuss-gnuradio] Buffer too small for min_noutput_items (ofdm_carrier_allocator_cvc)
Date: Wed, 29 Jan 2014 14:56:24 -0500
Dear All,

Here's a little update:

Changing GR_FIXED_BUFFER_SIZE from 32k to 128k solved the problem, but at the cost of quite a slowdown.

The problem was, in hindsight, quite obvious. Not a bug, most definitely. My OFDM implementation just needed way too much memory.

Thanks, and happy hacking to all.

best,
aditya



On Wed, Jan 29, 2014 at 12:19 PM, Aditya Dhananjay <address@hidden> wrote:
Dear All,

I am running OFDM TX-RX in GRC. The parameters used are very similar to those in the TXRX example, with a few differences:

- FFT size changed to 1024
- Pilots aren't placed on fixed subcarriers on every symbol index. Every third symbol index has pilots.
- I've updated sync_word1, sync_word2, occupied_carriers, pilot_carriers, and pilot_symbols to reflect these changes. I've pasted these values at the end of the email for your reference.

When I run the flowgraph, it crashed with:

thread[thread-per-block[14]: <block ofdm_carrier_allocator_cvc (13)>]: Buffer too small for min_noutput_items

The value of best_n is 4, and the value of min_noutput_items is 6.

I had also experimented with a similar pilot placement scheme, but with fft_len = 64. That works fine with no issues.

Any pointers on how to fix this problem? Thanks!

best,
aditya

PARAMETERS USED:

sync_word1:
0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., 1.41421356, 0., -1.41421356, 0., -1.41421356, 0., 1.41421356, 0., 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sync_word2:
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 0, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]


occupied_carriers:
 ((-413, -412, -411, -409, -408, -407, -405, -404, -403, -401, -400, -399, -397, -396, -395, -393, -392, -391, -389, -388, -387, -385, -384, -383, -381, -380, -379, -377, -376, -375, -373, -372, -371, -369, -368, -367, -365, -364, -363, -361, -360, -359, -357, -356, -355, -353, -352, -351, -349, -348, -347, -345, -344, -343, -341, -340, -339, -337, -336, -335, -333, -332, -331, -329, -328, -327, -325, -324, -323, -321, -320, -319, -317, -316, -315, -313, -312, -311, -309, -308, -307, -305, -304, -303, -301, -300, -299, -297, -296, -295, -293, -292, -291, -289, -288, -287, -285, -284, -283, -281, -280, -279, -277, -276, -275, -273, -272, -271, -269, -268, -267, -265, -264, -263, -261, -260, -259, -257, -256, -255, -253, -252, -251, -249, -248, -247, -245, -244, -243, -241, -240, -239, -237, -236, -235, -233, -232, -231, -229, -228, -227, -225, -224, -223, -221, -220, -219, -217, -216, -215, -213, -212, -211, -209, -208, -207, -205, -204, -203, -201, -200, -199, -197, -196, -195, -193, -192, -191, -189, -188, -187, -185, -184, -183, -181, -180, -179, -177, -176, -175, -173, -172, -171, -169, -168, -167, -165, -164, -163, -161, -160, -159, -157, -156, -155, -153, -152, -151, -149, -148, -147, -145, -144, -143, -141, -140, -139, -137, -136, -135, -133, -132, -131, -129, -128, -127, -125, -124, -123, -121, -120, -119, -117, -116, -115, -113, -112, -111, -109, -108, -107, -105, -104, -103, -101, -100, -99, -97, -96, -95, -93, -92, -91, -89, -88, -87, -85, -84, -83, -81, -80, -79, -77, -76, -75, -73, -72, -71, -69, -68, -67, -65, -64, -63, -61, -60, -59, -57, -56, -55, -53, -52, -51, -49, -48, -47, -45, -44, -43, -41, -40, -39, -37, -36, -35, -33, -32, -31, -29, -28, -27, -25, -24, -23, -21, -20, -19, -17, -16, -15, -13, -12, -11, -9, -8, -7, -5, -4, -3, -1, 1, 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17, 19, 20, 21, 23, 24, 25, 27, 28, 29, 31, 32, 33, 35, 36, 37, 39, 40, 41, 43, 44, 45, 47, 48, 49, 51, 52, 53, 55, 56, 57, 59, 60, 61, 63, 64, 65, 67, 68, 69, 71, 72, 73, 75, 76, 77, 79, 80, 81, 83, 84, 85, 87, 88, 89, 91, 92, 93, 95, 96, 97, 99, 100, 101, 103, 104, 105, 107, 108, 109, 111, 112, 113, 115, 116, 117, 119, 120, 121, 123, 124, 125, 127, 128, 129, 131, 132, 133, 135, 136, 137, 139, 140, 141, 143, 144, 145, 147, 148, 149, 151, 152, 153, 155, 156, 157, 159, 160, 161, 163, 164, 165, 167, 168, 169, 171, 172, 173, 175, 176, 177, 179, 180, 181, 183, 184, 185, 187, 188, 189, 191, 192, 193, 195, 196, 197, 199, 200, 201, 203, 204, 205, 207, 208, 209, 211, 212, 213, 215, 216, 217, 219, 220, 221, 223, 224, 225, 227, 228, 229, 231, 232, 233, 235, 236, 237, 239, 240, 241, 243, 244, 245, 247, 248, 249, 251, 252, 253, 255, 256, 257, 259, 260, 261, 263, 264, 265, 267, 268, 269, 271, 272, 273, 275, 276, 277, 279, 280, 281, 283, 284, 285, 287, 288, 289, 291, 292, 293, 295, 296, 297, 299, 300, 301, 303, 304, 305, 307, 308, 309, 311, 312, 313, 315, 316, 317, 319, 320, 321, 323, 324, 325, 327, 328, 329, 331, 332, 333, 335, 336, 337, 339, 340, 341, 343, 344, 345, 347, 348, 349, 351, 352, 353, 355, 356, 357, 359, 360, 361, 363, 364, 365, 367, 368, 369, 371, 372, 373, 375, 376, 377, 379, 380, 381, 383, 384, 385, 387, 388, 389, 391, 392, 393, 395, 396, 397, 399, 400, 401, 403, 404, 405, 407, 408, 409, 411, 412, 413),(range(-414,0)+range(1,415)),(range(-414,0)+range(1,415)),)


pilot_carriers:
((-414, -410, -406, -402, -398, -394, -390, -386, -382, -378, -374, -370, -366, -362, -358, -354, -350, -346, -342, -338, -334, -330, -326, -322, -318, -314, -310, -306, -302, -298, -294, -290, -286, -282, -278, -274, -270, -266, -262, -258, -254, -250, -246, -242, -238, -234, -230, -226, -222, -218, -214, -210, -206, -202, -198, -194, -190, -186, -182, -178, -174, -170, -166, -162, -158, -154, -150, -146, -142, -138, -134, -130, -126, -122, -118, -114, -110, -106, -102, -98, -94, -90, -86, -82, -78, -74, -70, -66, -62, -58, -54, -50, -46, -42, -38, -34, -30, -26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46, 50, 54, 58, 62, 66, 70, 74, 78, 82, 86, 90, 94, 98, 102, 106, 110, 114, 118, 122, 126, 130, 134, 138, 142, 146, 150, 154, 158, 162, 166, 170, 174, 178, 182, 186, 190, 194, 198, 202, 206, 210, 214, 218, 222, 226, 230, 234, 238, 242, 246, 250, 254, 258, 262, 266, 270, 274, 278, 282, 286, 290, 294, 298, 302, 306, 310, 314, 318, 322, 326, 330, 334, 338, 342, 346, 350, 354, 358, 362, 366, 370, 374, 378, 382, 386, 390, 394, 398, 402, 406, 410, 414), (), (),)

pilot_symbols:
((0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j, 0.7+0.7j, -0.7+0.7j, -0.7-0.7j, 0.7-0.7j),(),(),)

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