Random Packet CDMA: Reducing Delay and Increasing Throughput of WLAN Systems
نویسندگان
چکیده
Random Packet CDMA: Reducing Delay and Increasing Throughput of WLAN Systems Roland Kempter and Behrouz Farhang-Boroujeny Department of Electrical and Computer Engineering, University of Utah, USA Abstract— We revisit Random Packet Code Division Multiple Access (RP-CDMA), a recently proposed Physical/MAC layer scheme for wireless CDMA networks. We revise earlier results by adopting a more realistic Spread Aloha model for header transmission and packet sizes with distributions typical for Internet2 traffic. Thanks to timing recovery in the RP-CDMA header and greatly reduced packet collision probability, unlike Spread Aloha, RP-CDMA enables the use of multiuser receivers for data detection. We simulate the throughput characteristics of RP-CDMA with the matched filter, the decorrelator, the MMSE and partitioned spreading demodulation detection and compare performance to Spread Aloha in a base station centric network.
منابع مشابه
Performance of CDMA random access systems with packet combining in fading channels
We analyze the system performance of code-division multiple-access (CDMA) random access systems with linear receivers and packet combing in multipath fading channels. Both slotted and unslotted CDMA systems with random spreading codes are considered. The analysis is based on large systems in which both the offered load and the processing gain tend to infinity but their ratio is fixed. It is rel...
متن کاملHandoff Performance of Delay-Insensitive Data Services in DS-CDMA Systems
We investigate the performance of handoff policies for data services and voice services in a DS-CDMA system with respect to delay sensitivity. A slotted ALOHA random access scheme on the reverse link is employed to support data services. A soft handoff policy, hard handoff policy and restricted-transmission policy for data packets in a soft handoff region are compared in terms of throughput, sy...
متن کاملExploitation of Historical Signals in Large Packet-Switched CDMA Random Access Systems
This paper proposes an approach to exploitation of retransmission diversity embedded in multiple packet transmissions of a large CDMA random access system. In the approach, the interference signals caused by packets that have been successfully demodulated previously are first subtracted thus reducing interference. Second, all signals received in slots when the desired packet was transmitted are...
متن کاملSustainable Throughput of Wireless LANs with Multi-Packet Reception Capability under Bounded Delay-Moment Requirements
With the rapid proliferation of broadband wireless services, it is of paramount importance to understand how fast data can be sent through a wireless local area network (WLAN). Thanks to a large body of research following the seminal work of Bianchi, WLAN throughput under saturated traffic condition has been well understood. By contrast, prior investigations on throughput performance under unsa...
متن کاملPerformance of CDMA slotted ALOHA multiple access with multiuser detection
of this work is to assess the impact of such MU detecPacketized random access based on Code Division Multiple Access (CDMA) is considered. Our primary aim is to assess the impact of (uncoded) multi-user (MU) detectors on the performance of CDMA with slotted ALOHA. The impact of respective multiple packet reception capability for the matched filter and MMSE detector on delay/throughput improveme...
متن کامل