rate cdma systems
RSS rate cdma systemsConvergence Analysis of Iteratively Detected Time Hopping and DS-CDMA Ultrawide Bandwidth Systems by EXIT Charts
White Paper This paper presents a novel analysis on the decoding convergence of Time Hopping (TH) and Direct Sequence (DS) Code-Division Multiple-Access (CDMA) Ultrawide Bandwidth (UWB) systems when communicating over multipath Nakagami channels. [11 Jul 2008]
Hybrid PIM-CDMA for Optical Wireless Networks
White Paper Results obtained show that hybrid PIM-CDMA offers higher transmission bit rate compared with hybrid pulse position modulation (PPM) - CDMA and on-and off keying (OOK) - CDMA at fixed slot rate condition, but offers marginally higher bit error rate. [03 Jul 2008]
A New CDMA/SDMA Structure With Transmit Diversity
White Paper Here these two techniques are combined to produce a new cooperative diversity architecture for CDMA/SDMA cellular systems using a space time block code. The bit error rate performance for this architecture with the UMTS UTRA TDD and TD-SCDMA... [03 Jul 2008]
Decentralized and Fair Rate Control in a Multi-Sector CDMA System
White Paper This paper examines such optimal resource allocation through non-uniform rate assignment in a CDMA system, using a proportional fair scheme. It also examines distributed algorithms for such a rate assignment, and their performance in dynamic systems. [03 Jul 2008]
Comparison of W-CDMA and cdma2000
White Paper This advantage of W-CDMA mainly results from the higher coverage of high-bit-rate services.cdma2000's 1xEV systems are technologically exhausted when capacity is concerned, while W-CDMA still holds potential by introducing HSDPA. [03 Jul 2008]
Interference Cancellation for Multirate Multiuser Systems
White Paper In the work discussed in this paper, the authors compare multistage Successive Interference Cancellation (SIC) and multistage Parallel Interference Cancellation (PIC) under two different realistic dual rate asynchronous DS CDMA schemes. [03 Jul 2008]
Optimal Time-Hopping Scheme for CDMA Air Interface in Broad-Band Wireless Systems
White Paper Time-hopping techniques have been applied in Direct Sequence Code Division Multiple Access (DS-CDMA) to reduce the harmful effects of a sudden power surge in the received signals. For both cases, the Bit-Error Rate (BER) increases significantly for... [03 Jul 2008]
Variable Bit Allocation for FH-CDMA Wireless Communication Systems
White Paper This paper shows that the maximum throughput bit-rate/channel-assignment problem is NP-hard. In the wireless indoor environment, the channel may vary slowly as users and the interferers may move at slow speeds. [03 Jul 2008]
The cdma2000 High Rate Packet Data System
White Paper Code division multiple access (CDMA) technology was introduced in cellular systems in the early 1990s with the development of the IS-95 standard. The experience gained through commercial deployment of IS-95 based networks has shown that on average... [03 Jul 2008]
Femtocells to speed arrival of next-gen mobile networks?
News Saunders added: "It isn't a technology that we think is specific to just one of the flavours of mobile air interface - UMTS or GSM or CDMA or WiMax, for that matter - we actually think femotcells bring things to all those technologies. [30 Jun 2008]
Proposal of Adaptive Downlink Modulation Using OFDM and MC-CDMA for Future Mobile Communications System
White Paper In this paper, an adaptive downlink modulation using OFDM and MC-CDMA is presented for maximizing the system capacity and actualizing QoS (Quality of Service) control of future mobile communications. To meet the strong demand for broadband... [10 Apr 2008]
Joint Uplink and Downlink Capacity Considerations in Admission Control in Multiservice CDMA/HSDPA Systems
White Paper Those two links are asymmetric in the case of CDMA-based High Data Rate (HDR)/High-Speed Downlink Packet Access (HSDPA) systems, the uplink being much slower than the downlink and thus, in some cases, restrictive in terms of the achievable... [20 Dec 2007]
Performance Evaluation of TCP Under Dynamic Allocation Scheme for Down Link Transmission Rate in W-CDMA Systems
W-CDMA standardized in 3GPP (standardizing IMT-2000) allows dynamic allocation of transmission rates to flows over a wireless link in response to changing link condition for each flow, which is thought to be essential for next generation mobile... [06 Dec 2007]
Performance Evaluation of TCP Under Dynamic Allocation Scheme for Down Link Transmission Rate in W-CDMA Systems
White Paper W-CDMA standardized in 3GPP (standardizing IMT-2000) allows dynamic allocation of transmission rates to flows over a wireless link in response to changing link condition for each flow, which is thought to be essential for next generation mobile... [05 Dec 2007]
Multi-Code Multicarrier CDMA: Performance Analysis
White Paper This indicates that MC-MC-CDMA should be seriously considered for next generation cellular systems. A novel multi-code multicarrier code division multiple access (MC-MC-CDMA) system is proposed and analyzed in a frequency selective fading channel. [04 Jul 2007]
