Improved Performance of Companded OFDM System using Non Symmetric Approach

Er. Piyush Vyas; Mr. Tejas Maniar

Companding transforms signals useful under assumption of infinite bandwidth. Under band limited conditions Out of band radiation (OBR) parameter filters out. So bandwidth is a factor that decides the filtering out OBR on the performance of companded OFDM systems. As a result filtering becomes essential under band limited conditions in turn this does deteriorate the system performance signifi-cantly. In this paper method proposed to overcome the perfor-mance degradation of various aspects on linear/nonlinear companders using for digital modulation techniques, method called non linear symmetric scheme based on the use of curve fitting method to find out a suitable polynomial to be used for decompanding at the receiver in sufficient bandwidth condi-tions. This method indeed improves the performance in com-parison in various aspects like PAPR, BER, OBR, functions of FFT, IFFT etc. to existing symmetric methods when filter-ing is necessary for band limited conditions.

Select Volume / Issues:

• Volume 3 Issue 5, Sept. 2012

Year:

2012

Type of Publication:

Article

Keywords:

Companding; OFDMA; CDMA; TDMA; FDMA; Digital Techniques and their performance

Journal:

IJECCE

Volume:

3

Number:

5

Pages:

1124-1129

Month:

Sept.