name: CDD
full_form: Cyclic Delay Diversity
context: Notation used in this subclause: P t: number of physical channels for timeslot t , Pt = 1..2 for uplink ; Pt = 1...16 for downlink Utp: capacity in bits for the physical channel p in timeslot t Ut.: total number of bits to be assigned for timeslot t bsp: number of consecutive bits to assign per code for downlink all bsp = 1 for uplink if SF1 >= SF2 then bs1 = 1 ; bs2 = SF1/SF2 ; if SF2 > SF1 then bs1 = SF2/SF1; bs2 = 1 ; fbp: number of already written bits for each code pos: intermediate calculation variable for p=1 to P t -- reset number of already written bits for every physical channel fbp = 0 end for p = 1 -- start with PhCH #1 for k=1 to Ut. do while (fbp == Utp) -- physical channel filled up already ? p = ( p mod Pt )+1 ; end do if (p mod 2) == 0 pos = Utp - fbp -- reverse order else pos = fbp + 1 -- forward order endif wtp,pos = gt,k -- assignment fbp = fbp + 1 -- Increment number of already written bits if (fbp mod bsp) == 0 -- Conditional change to the next physical channel p
description: Cyclic Delay Diversity (CDD) is a transmission mode used in wireless communication systems, specifically in the context of Multiple-Input Multiple-Output (MIMO) and Carrier Aggregation (CA). It is designed to improve the performance of downlink transmissions by introducing cyclic delays between different transmit antennas or antenna ports. The provided context from 3GPP TS 36.101 highlights CDD's application in various carrier aggregation scenarios, emphasizing its role in enhancing signal quality and reliability.
explanation: CDD is classified under Technology because the context describes it as a method for improving transmission performance in wireless communication systems, detailing its application in specific technical scenarios such as carrier aggregation and MIMO configurations. The emphasis on tables and test parameters further supports this classification, indicating CDD's role as a technological approach rather than a network function, interface, or service.
section_title: 8.2.1.3.1	Minimum Requirement 2 Tx Antenna Port
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