Title :
Performance comparison of Single Carrier Modulation with frequency domain equalization an OFDM for wireless communications
Author :
Khan, U. ; Baig, S. ; Mughal, M.J.
Author_Institution :
Fac. of Electron. Eng., Ghulam Ishaq Khan Inst. of Eng. Sci. & Technol., Swabi, Pakistan
Abstract :
Orthogonal Frequency Division Multiplexing (OFDM) has the inherent problem of high peak to average power ratio (PAPR). Moreover, it suffers from high sensitivity to frequency offsets and narrowband interference (NBI). Contrary to this, Single Carrier Modulation (SCM) offers smaller PAPR and reduced sensitivity to NBI. However, it requires an efficient channel equalization technique. In literature, frequency domain channel equalization has been proposed for SCM systems in wireless communications. It also possesses the advantage of lower complexity in signal processing, as in the case of OFDM. This paper presents performance comparison between OFDM and SCM with frequency domain equalization for multipath wireless channel. SCM utilizes minimum mean square error (MMSE) algorithm for the training of the frequency domain equalizer. It is shown that SCM employing a frequency domain MMSE equalizer has a better bit error rate (BER) performance than OFDM. Also, the performance comparison of SCM and OFDM systems in the presence of NBI over additive white gaussian noise (AWGN) link shows that SCM is less sensitive to NBI.
Keywords :
OFDM modulation; equalisers; mean square error methods; radiocommunication; wireless channels; OFDM; frequency domain channel equalization; frequency domain equalization; minimum mean square error algorithm; multipath wireless channel; narrowband interference; orthogonal frequency division multiplexing; performance comparison; single carrier modulation; wireless communications; AWGN; Bit error rate; Equalizers; Frequency domain analysis; Frequency modulation; Narrowband; OFDM modulation; Peak to average power ratio; Signal processing algorithms; Wireless communication; Minimum Mean Square Error Equalization; narrowband interference (NBI);
Conference_Titel :
Emerging Technologies, 2009. ICET 2009. International Conference on
Conference_Location :
Islamabad
Print_ISBN :
978-1-4244-5630-7
Electronic_ISBN :
978-1-4244-5631-4
DOI :
10.1109/ICET.2009.5353158