The throughput depends on how optimal and fast the program you write is. I'm not familar with Turbo decoder theory. In 2007, we used turbo decoder from IT++ libary (http://sourceforge.net/apps/wordpress/itpp/). It is faster than that we wrote. It supports a 64 kbps (One CPU) and 384 kbps (maybe 3 CPUs, I don't remember.) TD-SCDMA PHY layer in realtime. Another method is to use SIMD optimization.
Lin 2010/1/16 万千 <henghax...@126.com> > Dear all, > I am new to GNU Radio. I am building a transceiver with turbo encoder > and FQPSK modulator. At the receiver, FQPSK demodulator softly demodulates > the received signals with BCJR algorithm (FQPSK can be viewed as a two-bit > input TCM with 16 states). I simulated the system using C++ code. The length > of a frame into the turbo encoder is 1024. The generator polynomial is (013, > 015). 8 iterations are taken. The three metrics of alpha, beta and gamma are > calculated by using LUT to speed up the simulation. But I found that it > still is a little bit slow. The turbo decoding operation of a frame takes > about 0.064s (the simulation runs on a computer with 2 CPU of 3.0GHz and 2G > memory). So I think if the turbo decoding is done by software, the > throughput will be rather slow. > I checked the mailing list in 2006-05, in which it is said that > throughput is very slow with extension to turbo decoding. But I am still > wondering with some easy improvements, the throughput can be increased > significantly. Further, if iterative phase synchronization is done by > software, the receiving time of a frame will be intolerable. So I wonder > whether the software define radio is suited for the transceiver that I > mentioned above and GNU Radio is really real-time. > > thanks > Neil > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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