Research On The Bit-interleaved Coded Modulation Systems And The Single Frequency Network

With the explosive growth in the volume of business communications needs, can be usedfor mobile communication spectrum resources become tighter, and high-speed broadbandtransmission of complex multi-path environment is very harsh. Spectrum resources to addressthe explosive growth of communication services with the contradictions, we must seek a newtheory of innovation and breakthrough, the spectral efficiency of mobile networks, users havea significant capacity increase, while ensuring transmission reliability.The subjects of this paper is based on bit-Turbo product codes interleaved codedmodulation system. First, the study group as a sub-code code turbo product code of the softinput soft output decoding algorithm based on the product code to further study combined withefficient modulation communication scheme. Bit-interleaved coded modulation is able toapproach the channel capacity of coded modulation techniques, the paper provides a brieftheoretical basis of its analysis, the fading channel simulation of product codes and M-QAMmodulation scheme with coding. to further improve system performance, increase the diversitygain, this paper presents a constellation rotation based on the improvement program.Simulation results fully reflect the improved system in the fading channel effectiveness.The researchers then bit-interleaved coded modulation systems, a new networkingsolution with frequency. Frequency part of the network with the theoretical basis of BeijingUniversity of Posts and Professor Li Daoben’s superimposed coding multiplexing multipleaccess (Overlapped Code Division Multiple Access, OVCDMA) technology. Principle offour-color-based network, that is, each code corresponding to a color, each adjacent cell usingthe same frequency band, the frequency reuse factor of1, but complementary code betweenthe different neighboring cells by4-order distinction between broad complementary sequenceplot, the spectral efficiency of each cell is the same. The technology to ensure spectrumefficiency, based on the adjacent cell interference can be completely eliminated signal toensure transmission reliability, technical design performance to advanced level.Finally, the simulation program for traditional, low efficiency of pure software simulation,hardware emulation is not flexible enough pure shortcomings and propose an FPGA-basedSystem Generator hardware co-simulation platform for networking systems on the same frequency under the conditions in a variety of parameters error performance of the hardwareco-simulation and the results analyzed. Simulation hardware co-simulation system not onlyfast, flexible and convenient to use, with friendly interface, high reliability and simulation, thesimulation results to the business system into a short cycle, code reuse is high.