On the Achievable Rate of OFDM With Index Modulation
On the Achievable Rate of OFDM With Index Modulation
复制标题
DOI：
10.1109/tsp.2015.2500880
复制
发表时间：
2016-04
影响因子：
5.4
通讯作者：
Miaowen Wen;Xiang Cheng;Meng Ma;B. Jiao;H. Poor
中科院分区：
文献类型：
--
作者：
Miaowen Wen;Xiang Cheng;Meng Ma;B. Jiao;H. Poor
正交频分复用指数调制（OFDM- im）是近年来发展起来的一种将空间调制原理扩展到OFDM子载波的传输技术。本文从可实现速率的角度研究了OFDM-IM的性能，假设接收端有m星座和信道状态信息。在此基础上，提出了一种用于子载波使用的交错分组方法。与现有的分组方法相比，该分组方法可以更好地利用频率选择性衰落信道上的分集效应，特别是当子载波组内任意两个子载波的间距大于相干带宽时。数值结果表明，在小M和一定信噪比范围内，交织分组OFDM- im优于传统OFDM。最后，研究了调制类型对OFDM-IM性能的影响。在相移键控方面，OFDM- im技术比正交调幅技术更具有优越性。
Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a recently developed transmission technique that extends the principle of spatial modulation to OFDM subcarriers. In this paper, the performance of OFDM-IM is studied in terms of the achievable rate assuming an M-ary constellation and that channel state information is available at the receiver. A closed-form lower bound is derived, based on which an interleaved grouping method is proposed for the use of subcarriers. In comparison with the existing grouping method, the proposed one can better benefit from the diversity effects over frequency-selective fading channels, especially when the spacing of any two subcarriers within a subcarrier group is larger than the coherence bandwidth. Through numerical results, it is revealed that OFDM-IM with interleaved grouping outperforms classical OFDM for small M and certain ranges of signal-to-noise ratio. Finally, the effects of modulation types on the performance of OFDM-IM are studied. It is found that the superiority of OFDM-IM over classical OFDM is greater for phase-shift keying than for quadrature amplitude modulation.