TY - GEN
T1 - Orthogonal codes for MAI-free MC-CDMA with Carrier Frequency Offsets (CFO)
AU - Tadjpour, Layla
AU - Tsai, Shang-Ho
AU - Kuo, C. C.Jay
PY - 2006/12/1
Y1 - 2006/12/1
N2 - The performance of MC-CDMA in the presence of carrier frequency offsets (CFO) can be severely degraded due to multiaccess interference (MAI). It is shown in this work that a properly chosen subset of real Hadamard-Walsh or exponential codes can achieve zero MAI in a CFO environment. For a channel of length L and a number G of power of 2 with G ≥ L, we prove that I + log 2 (N/G) Hadamard-Walsh codewords or N/G exponential codewords can achieve zero MAI under any CFO level. Simulation results are given to corroborate derived theoretical results and evaluate the performance of MC-CDMA with a variable number of users in a CFO environment.
AB - The performance of MC-CDMA in the presence of carrier frequency offsets (CFO) can be severely degraded due to multiaccess interference (MAI). It is shown in this work that a properly chosen subset of real Hadamard-Walsh or exponential codes can achieve zero MAI in a CFO environment. For a channel of length L and a number G of power of 2 with G ≥ L, we prove that I + log 2 (N/G) Hadamard-Walsh codewords or N/G exponential codewords can achieve zero MAI under any CFO level. Simulation results are given to corroborate derived theoretical results and evaluate the performance of MC-CDMA with a variable number of users in a CFO environment.
UR - http://www.scopus.com/inward/record.url?scp=50949120516&partnerID=8YFLogxK
U2 - 10.1109/GLOCOM.2006.605
DO - 10.1109/GLOCOM.2006.605
M3 - Conference contribution
AN - SCOPUS:50949120516
SN - 142440357X
SN - 9781424403578
T3 - GLOBECOM - IEEE Global Telecommunications Conference
BT - IEEE GLOBECOM 2006 - 2006 Global Telecommunications Conference
T2 - IEEE GLOBECOM 2006 - 2006 Global Telecommunications Conference
Y2 - 27 November 2006 through 1 December 2006
ER -