This paper proposes a phase shift scheme in cyclic delay diversity (CDD) for single-carrier frequency division multiple access (SC-FDMA) in Internet of Things (IoT) applications. The proposed scheme is assumed to be applied to the uplink of Long Term Evolution (LTE) systems. Since the transmission rates of IoT applications are small, each uplink connection may occupy less than 12 subcarriers that corresponds to one resource block (RB) of the LTE. Since the length of the data sequence in time domain is short so that CDD may provide limited frequency diversity. The proposed scheme shifts the phases of the data symbols in time domain and spreads each subcarrier component over multiple subcarriers. Thus, more diversity gain can be realized with CDD. Numerical results obtained through computer simulation shows that the proposed scheme improves the performance by about 5-7 dB at the bit error rate (BER) of 104 for the data sequence length of 4.
|Title of host publication
|2015 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2015
|Institute of Electrical and Electronics Engineers Inc.
|Number of pages
|Published - 2016 Mar 11
|International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2015 - Nusa Dua, Bali, Indonesia
Duration: 2015 Nov 9 → 2015 Nov 12
|International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2015
|Nusa Dua, Bali
|15/11/9 → 15/11/12
ASJC Scopus subject areas
- Artificial Intelligence
- Computer Networks and Communications
- Signal Processing