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ICC
2007
IEEE

Channel-Matched Spreading Codes for the Downlink of MC-CDMA

9 years 3 days ago
Channel-Matched Spreading Codes for the Downlink of MC-CDMA
Abstract-- This paper concerns the multiple access performance of spreading codes used in the downlink of multicarrier code-division multiple-access (MC-CDMA). Complex-valued spreading codes, particularly polyphase codes, are investigated based on a system model in which modulation formats, equalization/combining schemes, and fading statistics are general. Different from previous approaches, we pay special attention to the influence of channel correlation on the performance of spreading codes and try to take advantage of the channel correlation in the design of spreading codes. We begin by considering a worst-case frequency-selective fading channel characterized by independent and identically distributed (i.i.d.) fading for all subcarriers. Unitary polyphase spreading codes are proven to be optimal among all polyphase codes for the i.i.d. fading channel. Next, optimal spreading codes for a two-user case are derived analytically. We proceed to consider a block-wise correlated fading cha...
Qinghua Shi, Yong Liang Guan, Choi Look Law
Added 16 Aug 2010
Updated 16 Aug 2010
Type Conference
Year 2007
Where ICC
Authors Qinghua Shi, Yong Liang Guan, Choi Look Law
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