一种应用于FM IBOC DAB系统的比特交织编码调制方案

Bit-interleaved coded modulation for FM IBOC broadcasting

提出了一种适用于FM IBOC广播系统的比特交织编码调制方案。此方案结合互补增信删余卷积码(CPPC)和基于迭代译码的比特交织编码调制(BICM-ID)算法。互补增信删余卷积码能有效抵抗FM IBOC系统中面对的第一邻频干扰和无线信道噪声、衰落等干扰。同时,运用基于软判决反馈迭代译码的比特交织编码调制算法,可以不通过扩展频带来提高FM IBOC广播系统在瑞利信道中的编码增益。仿真结果表明,本方案能有效提高FM IBOC广播系统的接收性能。

A bit-interleaved coded modulation （BICM） scheme was proposed for FM in-band on-channel （IBOC） digital audio broadcasting （DAB） systems, which combines complementary punctured-pair convolutional codes （CPPC） and BICM with iterative decoding （BICM-ID）. The CPPC can resist the first adjacent-channel interference, the noise and fading. Meanwhile, by using the BICM-ID algorithm, the scheme can make FM IBOC broadcasting systems yield a better coding gain over Rayleigh fading channels without bandwidth expansion. The simulation results show that the proposed scheme can effectively improve the receiving performance of an FM IBOC system.