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Pre-processing (PP) of received symbol vector and channel matrices is an essential pre-requisite operation for Sphere Decoder (SD)-based detection of Multiple-Input Multiple-Output (MIMO) wireless systems. PP is a highly complex operation, but relative to the total SD workload it represents a relatively small fraction of the overall computational cost of detecting an OFDM MIMO frame in standards such as 802.11n. Despite this, real-time PP architectures are highly inefficient, dominating the resource cost of real-time SD architectures. This paper resolves this issue. By reorganising the ordering and QR decomposition sub operations of PP, we describe a Field Programmable Gate Array (FPGA)-based PP architecture for the Fixed Complexity Sphere Decoder (FSD) applied to 4 × 4 802.11n MIMO which reduces resource cost by 50% as compared to state-of-the-art solutions whilst maintaining real-time performance.
|Pages||1250 - 1253|
|Number of pages||4|
|Publication status||Published - Dec 2013|
|Event||Global Conference on Signal and Information Processing (GlobalSIP), 2013 IEEE - Austin, United States|
Duration: 03 Dec 2013 → 05 Dec 2013
|Conference||Global Conference on Signal and Information Processing (GlobalSIP), 2013 IEEE|
|Period||03/12/2013 → 05/12/2013|
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