Frequency domain equalisation in CDMA detection

✍ Scribed by Martoyo, Ihan ;Jondral, Friedrich K.

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 361 KB
• Volume: 19
• Category: Article
• ISSN: 1124-318X
• DOI: 10.1002/ett.1177

✦ Synopsis

Abstract

The present paper introduces frequency domain equalisation (FDE) as an efficient means for single‐user detection (SUD) in universal mobile telecommunication systems (UMTS) handhelds. Such an SUD is, at least partially, able to remove multiple access interference (MAI) like a multi‐user detector (MUD), however with several important advantages

the operation principle of an FDE‐SUD is simple and easy to understand,

the FDE‐SUD shows low numerical complexity and therefore,

it is not power hungry like an MUD.

The problem of applying FDE without zero‐padding or cyclic‐prefix insertion is solved by using the overlap‐cut method. In this paper we also prove that the performance of the FDE‐SUD is practically identical to that of linear MUD for a fully loaded UMTS cell. Furthermore, armed with the idea of FDE for code division multiple access (CDMA), we can construct a common receiver structure for CDMA, time division multiple access (TDMA), orthogonal frequency division multiplexing (OFDM) and multi‐carrier CDMA (MC‐CDMA) systems. This is an extremely useful idea in enabling a software‐defined radio (SDR) which can operate seamlessly in several environments such as UMTS, the IEEE 802.11a and WiMaX. FDE based receivers could be one important building‐block for the next generation mobile communications. Copyright © 2008 John Wiley & Sons, Ltd.