To do this, you should position your APs so that adjacent APs use non-overlapping channels. For example, place...
the AP on channel 1 next to APs using channels 6 and 11. The AP using channel 6 should be next to APs using channels 11 and 1. And so on. The coverage area of each AP should overlap with the next AP enough to avoid leaving holes, but not so much that stations bounce back and forth between adjacent APs. (Stations automatically roam to the AP with the strongest signal.) To learn more about WLAN layout, I recommend reading the CWNA Study Guide from Planet3 Wireless.
That guide also discusses the use of wireless repeaters. Repeaters are primarily useful when you don't have wired network access for all of your access points. Repeaters let you use wireless to connect your APs to each other. If wired network access is readily available in the locations where you want to place your APs, then repeater mode is not your best option.
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