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Personal, Indoor and Mobile Radio Communications

About: Personal, Indoor and Mobile Radio Communications is an academic conference. The conference publishes majorly in the area(s): Communication channel & Fading. Over the lifetime, 12472 publication(s) have been published by the conference receiving 124248 citation(s). more

Topics: Communication channel, Fading, MIMO more

Proceedings ArticleDOI: 10.1109/PIMRC.2013.6666156
Hosein Nikopour1, Hadi Baligh1Institutions (1)
25 Nov 2013-
Abstract: Multicarrier CDMA is a multiplexing approach in which modulated QAM symbols are spread over multiple OFDMA tones by using a generally complex spreading sequence. Effectively, a QAM symbol is repeated over multiple tones. Low density signature (LDS) is a version of CDMA with low density spreading sequence allowing us to take advantage of a near optimal ML receiver with practically feasible complexity. In this paper, we propose a new multiple access scheme so called sparse code multiple access (SCMA) which still enjoys the low complexity reception technique but with better performance compared to LDS. In SCMA, the procedure of bit to QAM symbol mapping and spreading are combined together and incoming bits are directly mapped to a multidimensional codeword of an SCMA codebook set. Each layer or user has its dedicated codebook. Shaping gain of a multidimensional constellation is the main source of the performance improvement in comparison to the simple repetition of QAM symbols in LDS. In general, SCMA codebook design is an optimization problem. A systematic sub-optimal approach is proposed here for SCMA codebook design. more

Topics: Codebook (56%), QAM (55%), Code division multiple access (54%) more

1,006 Citations

Proceedings ArticleDOI: 10.1109/PIMRC.2013.6666209
25 Nov 2013-
Abstract: As a promising downlink multiple access scheme for further LTE enhancement and future radio access (FRA), this paper investigates the system-level performance of non-orthogonal multiple access (NOMA) with a successive interference canceller (SIC) on the receiver side. The goal is to clarify the potential gains of NOMA over orthogonal multiple access (OMA) such as OFDMA, taking into account key link adaptation functionalities of the LTE radio interface such as adaptive modulation and coding (AMC), hybrid automatic repeat request (HARQ), time/frequency-domain scheduling, and outer loop link adaptation (OLLA), in addition to NOMA specific functionalities such as dynamic multi-user power allocation. Based on computer simulations, we show under multiple configurations that the system-level performance achieved by NOMA is superior to that for OMA. more

Topics: Link adaptation (59%), Radio resource management (56%), Noma (52%) more

726 Citations

Open accessProceedings ArticleDOI: 10.1109/PIMRC.1996.567423
15 Oct 1996-
Abstract: The IEEE 802.11 protocol for wireless local area networks adopts a CSMA/CA protocol with exponential backoff as medium access control technique. As the throughput performance of such a scheme becomes critical when the number of mobile stations increases, in this paper we propose an adaptive contention window mechanism, which dynamically selects the optimal backoff window according to the estimate of the number of contending stations. We show that this technique leads to stable behavior, and it outperforms the standard protocol when the network load and the number of mobile stations are high. We also investigate the CSMA/CA with the optional RTS/CTS technique, and we show that our adaptive technique reaches better performance only when the packet size is short. Finally, the performance of a system environment with hidden terminals show that the RTS/CTS mechanism, which can also be used in conjunction with the adaptive contention window mechanism, provides significant improvements. more

633 Citations

Proceedings ArticleDOI: 10.1109/PIMRC.2005.1651855
K. Brueninghaus1, D. Astely, T. Salzer, S. Visuri  +3 moreInstitutions (1)
11 Sep 2005-
Abstract: This paper gives an overview of some so-called link performance models used in system level simulations to determine the link packet error rate (PER) at reduced complexity. A subset of link performance models is evaluated in terms of PER prediction accuracy focusing on a single receive and transmit antenna OFDM link with different coding options and channel characteristics. The results demonstrate that a mutual-information based metric which accounts for the modulation alphabet is preferable in the considered cases and, furthermore, applicable to the large class of MIMO-OFDM transmission techniques with linear pre- and post-processing more

Topics: Link adaptation (67%), Packet radio (55%), Orthogonal frequency-division multiplexing (53%) more

501 Citations

Proceedings ArticleDOI: 10.1109/PIMRC.2007.4394515
Holger Claussen1Institutions (1)
04 Dec 2007-
Abstract: In this paper, the feasibility of user deployed femtocells in the same frequency band as an existing macrocell network is investigated. Key requirements for co-channel operation of femtocells such as auto-configuration and public access are discussed. A method for power control for pilot and data that ensures a constant femtocell radius in the downlink and a low pre-definable uplink performance impact to the macrocells is proposed, and the theoretical performance of randomly deployed femtocells in such a hierarchical cell structure is analysed for one example of a cellular UMTS network using system level simulations. The resulting impact on the existing macrocellular network is also investigated. more

Topics: Macrocell (60%), Hierarchical cell structure (57%), Femtocell (55%) more

484 Citations

No. of papers from the Conference in previous years

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Conference's top 5 most impactful authors

Rahim Tafazolli

45 papers, 332 citations

Wenbo Wang

39 papers, 554 citations

Harald Haas

34 papers, 1.1K citations

Mohamed-Slim Alouini

26 papers, 282 citations

Andrew R Nix

25 papers, 342 citations

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