Advanced Technology in Teaching pp 729-735 | Cite as
An Improved Code Modulation Scheme Based on BICM for IBOC-FM
Abstract
In-Band On-Channel(IBOC) digital audio broadcasting(DAB) is a method of digital audio radio, which could transmit analog FM and digital audio simultaneously. However, due to the existence of fading and interference in FM bands, and transmit capacity has reached its limitations for the bandwidth, thus, adding digital transmission availability in the crowded FM band is a challenging proposition. Diversity is one of the crucial techniques for digital transmission. Bit-interleaved coded modulation (BICM) can provide spatial diversity without occupying high bandwidth. Meanwhile, Low Density Parity Check( LDPC) code with low density scheme can be a better choice as IBOC FM system which allows a certain degree of freedom in design, In this paper, a type of coded modulation scheme was proposed in Hybrid in-band on-channel system, by use of BICM embedded into LDPC code is instead of BICM embedded convolutional codes for IBOC FM system, would result in coding gains without bandwidth expansion. The simulation results show that the proposed scheme can effectively improve the receiving performance of an FM IBOC system over Rayleigh fading channels. When BER is below 10− 4 can achieve more than 2dB coding gains.
Keywords
IBOC FM LDPC diversity BICM Rayleigh fading channelsPreview
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