gnuradio - GnuRadio 上的 GMSK 传输问题
问题描述
我正在尝试实施相当简单的方案来将数据从一个 sdr 板传输到另一个板。我正在使用 GnuRadio 3.7.14,我的同伴方案看起来像这样
源文件是一个 96 字节长的二进制文件,看起来像这样
00000000 00 00 00 ff aa aa aa aa aa aa aa aa aa aa aa aa |................|
00000010 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00000020 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00000030 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000060
在输出时,我希望在一些噪音之后会重复输入模式(可能有一些错误),但实际上它看起来像这样
00004610 00 00 00 1f f5 55 55 55 55 55 55 55 55 55 55 55 |.....UUUUUUUUUUU|
00004620 55 55 55 55 55 55 55 55 53 63 eb ea aa a8 aa aa |UUUUUUUUSc......|
00004630 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004640 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004650 80 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004660 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 88 |................|
00004670 80 00 00 7f d5 55 55 55 55 55 55 55 55 55 55 55 |.....UUUUUUUUUUU|
00004680 55 55 55 55 55 55 55 0d 0b a2 aa aa aa aa aa aa |UUUUUUU.........|
00004690 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
000046a0 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
000046b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000046c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000046d0 00 00 01 ff 55 55 55 55 55 55 55 55 55 55 55 51 |....UUUUUUUUUUUQ|
000046e0 15 61 55 31 75 fc aa aa aa aa aa aa aa aa aa aa |.aU1u...........|
000046f0 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004700 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa a8 |................|
00004710 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004720 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004730 00 00 03 fe aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004740 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004750 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004760 aa aa 9a ac 6e 8a db 59 3c ae aa b8 aa ac aa a8 |....n..Y<.......|
00004770 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004780 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004790 00 00 07 fd 55 55 55 55 55 55 55 55 55 55 55 55 |....UUUUUUUUUUUU|
000047a0 55 55 55 55 55 55 55 55 55 45 55 55 55 55 5b 55 |UUUUUUUUUEUUUU[U|
000047b0 28 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |(...............|
000047c0 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa a0 |................|
000047d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000047e0 00 00 00 00 00 00 00 00 00 00 00 00 01 40 20 00 |.............@ .|
000047f0 00 00 1f f5 55 55 55 55 55 55 55 55 55 55 55 55 |....UUUUUUUUUUUU|
00004800 55 55 55 55 55 55 55 55 55 55 55 55 55 64 ab aa |UUUUUUUUUUUUUd..|
00004810 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004820 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa 80 |................|
00004830 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004840 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004850 00 00 7f d5 55 55 55 55 55 55 55 55 55 55 55 55 |....UUUUUUUUUUUU|
00004860 55 55 55 55 55 55 55 6e aa aa aa aa aa aa aa aa |UUUUUUUn........|
00004870 aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
00004880 aa aa aa aa aa aa aa aa aa aa aa a8 ab b3 54 00 |..............T.|
00004890 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000048a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000048b0 00 03 fe aa aa aa aa aa aa aa aa aa aa aa aa aa |................|
000048c0 aa aa aa aa aa aa a8 5d 15 55 55 55 55 55 55 55 |.......].UUUUUUU|
000048d0 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 55 |UUUUUUUUUUUUUUUU|
000048e0 55 55 55 55 55 55 55 55 55 55 41 56 b6 aa a0 00 |UUUUUUUUUUAV....|
000048f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00004900 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
我手动获取了这段输出文件,因此它与输入对齐。所以,在这里我看到了两个问题(我认为有一个原因):
- 字节 0xAA (10101010b) 在消息的某些部分切换到 0x55(01010101b),反之亦然
- 消息的开头“滑出”,字符串 47f0 和 4610 之间有 8 位差异
明显的原因是接收者获得的比特数量与发送者发送的不同,但我怀疑究竟是什么导致了这种行为?我该如何调试它以找出问题所在?
关于我的设置的几句话:我使用 3 个板,一个 USRP B210,一个 Limesdr-USB 和一个 Limesdr-Mini。我至少在 4 种不同的组合中尝试了这个实验,包括从电路板发送到自身,并且每次都收到相同的结果。板子似乎没问题,它们成功地接收 fm 广播并通过 fm 彼此发送/接收声音。
谢谢!
解决方案
实际上我发现了类似的问题,那里给出的食谱也对我有用。 在 GNU Radio 中使用 Xlating 滤波器进行 GFSK 解调
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