TY - GEN
T1 - Average BER perfomance and spectral efficiency for MIMO orthogonal MC DS-CDMA system over Nakagami-m fading channels
AU - Mark, James Osuru
AU - Saad, Mohamad Naufal Mohamad
AU - Samir, Brahim Belhaouari
PY - 2011
Y1 - 2011
N2 - Multiple Input Multiple Output (MIMO) systems have appeared as one of the promising approaches for increasing the capacity and lowering symbol or bit error probability of the wireless communication systems without increasing the bandwidth or the transmission power of the system. In this paper, we investigate the average channel capacity and bit error probability for MIMO orthogonal multicarrier direct Sequence Code Division Multiple Access (OMC DS-CDMA) system in Nakagami-m fading environment. We also consider the influence of the normalized space between two adjacent subcarriers of the system in average channel capacity analysis. Gaussian approximation method is employed to model multiuser interference (MUI) which mostly degrades the system operation. Hence, probability density function (PDF) of the instantaneous signal to interference noise ratio (SINR) is derived using Characteristic Function (CF) based method. Therefore, the exact closed form expression for the average channel capacity is derived by taking the expectation of Shannon channel capacity over the PDF of SINR. The results reveal that the average channel capacity of the MIMO OMC DS-CDMA system outperforms that of the conventional OMC DS-CDMA system. Similarly, we observe that MIMO MC DS-CDMA system has better spectral efficiency and bit error rate performance enhancement. Thus, we confirm the numerical results using Monte Carlo simulation technique.
AB - Multiple Input Multiple Output (MIMO) systems have appeared as one of the promising approaches for increasing the capacity and lowering symbol or bit error probability of the wireless communication systems without increasing the bandwidth or the transmission power of the system. In this paper, we investigate the average channel capacity and bit error probability for MIMO orthogonal multicarrier direct Sequence Code Division Multiple Access (OMC DS-CDMA) system in Nakagami-m fading environment. We also consider the influence of the normalized space between two adjacent subcarriers of the system in average channel capacity analysis. Gaussian approximation method is employed to model multiuser interference (MUI) which mostly degrades the system operation. Hence, probability density function (PDF) of the instantaneous signal to interference noise ratio (SINR) is derived using Characteristic Function (CF) based method. Therefore, the exact closed form expression for the average channel capacity is derived by taking the expectation of Shannon channel capacity over the PDF of SINR. The results reveal that the average channel capacity of the MIMO OMC DS-CDMA system outperforms that of the conventional OMC DS-CDMA system. Similarly, we observe that MIMO MC DS-CDMA system has better spectral efficiency and bit error rate performance enhancement. Thus, we confirm the numerical results using Monte Carlo simulation technique.
KW - Average bit error probability
KW - Average channel capacity
KW - CF
KW - Gaussian approximation
KW - MC-CDMA
KW - MIMO systems
KW - Nakagami-m fading
KW - OMC DS-CDMA systems
UR - http://www.scopus.com/inward/record.url?scp=84857067096&partnerID=8YFLogxK
U2 - 10.1109/NatPC.2011.6136421
DO - 10.1109/NatPC.2011.6136421
M3 - Conference contribution
AN - SCOPUS:84857067096
SN - 9781457718847
T3 - 2011 National Postgraduate Conference - Energy and Sustainability: Exploring the Innovative Minds, NPC 2011
BT - 2011 National Postgraduate Conference - Energy and Sustainability
T2 - 3rd National Postgraduate Conference - Energy and Sustainability: Exploring the Innovative Minds, NPC 2011
Y2 - 19 September 2011 through 20 September 2011
ER -