On Multicarrier Detection and Coherent CDMA Mobile Receiver Radio Systems with Joint Antenna Diversity

The combination of code division multiple access(CDMA) and multicarrier (MC) transmission techniques,termed MC-CDMA, is considered a promising alternative toconventional DS (direct sequence)-CDMA. For this reason, recent research activities haveconcentrated on the application of MC-CDMA to mobileradio systems. In this paper an MC-CDMA concept which iswell suited for mobile radio applications is described. The described MC-CDMA concept overcomesdisadvantages of previously proposed concepts. InMC-CDMA mobile radio systems, signal reception isimpaired by time-varying multipath propagation. Theimpairments can be reduced by applying diversitytechniques. Coherent receiver antenna diversity (CRAD)is especially attractive because only the signalprocessing at the receivers must be modified. In thiscommunication, the application of CRAD in combination withjoint detection (JD) techniques to the more criticaluplink of MC-CDMA mobile radio systems is investigated.It is explained that the deployment of JD techniques for CRAD is an effective countermeasure againstthe influence of the mobile radio channel on the systemperformance. Four JD techniques for CRAD which areapplicable to MC-CDMA are presented. Their performances are studied in bad urban, typical urban, andtypical macrocellular environments. It is shown thatMC-CDMA allows a favorable performance compared to otherCDMA concepts.     

Coverage of MC/JD-CDMA based macrocellular radio systems

A method for analysing the coverage of cellular radio systems is explained and applied to multicarrier joint detection code division multiple access (MC/JD-CDMA). The method comprises a link analysis which explicitly considers a quality of service criterion combined with a requirement on the area probability of service     

Performance of rate compatible punctured Turbo-codes for mobileradio applications

Future mobile radio systems like the European UMTS (universal mobile telecommunications system) will provide packet oriented data services with data rates up to 2 Mbit/s. Therefore, flexible and adaptive error correction coding must be deployed. Recently, rate compatible punctured Turbo-codes (RCPTCs) have been proposed. The authors discuss a design method for such codes and illustrate its viability by showing the performance results for an RCPTC with a block size of 672 bits     

Uplink spectral efficiency of multicarrier joint detection codedivision multiple access based cellular radio systems

The uplink spectral efficiency of multicarrier joint detection code division multiple access (MC/JD-CDMA) based cellular radio systems is determined in a macrocellular environment. Results are presented for two different slow power control schemes and speech transmission at 8 kbit/s per mobile. Cellular networks with a cluster order of three to four facilitate a most favourable performance