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The TD-LTE system is envisaged to adopt dynamic time division duplexing (TDD) transmissions for small cells to adapt their communication service to the fast variation of downlink (DL) and uplink (UL) traffic demands. However, different DL/UL directions for the same subframe in adjacent cells will result in new destructive interference components, i.e., eNB-to-eNB and UE-to-UE, with levels that can...
Significant progress has been made in the past few years on Dynamic Spectrum Access (DSA) wireless networks which seek to use RF spectrum more efficiently and dynamically. For example, many measurements of current spectrum utilization are available and theoretical analyses and computational simulations of DSA networks abound. In sharp contrast, few network systems, particularly those with a decentralized...
Routing is one of the key technologies of wireless mesh networks. Current routing algorithms generally define a routing metric with some parameters by taking their weighted average. However, the weight is not easy to value in practice and now the parameters needed are not usually supported by drivers of commercial wireless cards either. In this paper, we comprehensively consider hop counts, channel...
Equipping each node with multiple radios can substantially increase the capacity of wireless mesh networks, because in that way neighbor links can be assigned distinct channels to avoid interference. However, the aggregate network interference still may not be sufficiently reduced due to a rough channel assignment. This paper focuses on the static channel assignment issue of multi-radio multi-channel...
Dynamic spectrum access (DSA) provides a more flexible spectrum management method versus the current command and control method and promises much higher spectrum utilization efficiency. By this paradigm, secondary users can use vacant spectrum while guaranteeing non-interference to incumbent users. Therefore, spectrum awareness is a required function in DSA, and cooperative spectrum sensing is widely...
Most WSN routing protocols select route based on hop count. Efficient routing metric should consider both inter-flow and intra-flow interference. A new minimum route-interference routing metric for multi-radio WMN is proposed. The path which has a minimum total interference can be found by using this metric. Simulation result shows that network performance can be significantly improved with the new...
Network topology does not change dynamically in wireless mesh networks. Most of the end-to-end traffic flows are between mesh nodes and gateways. A tree-base routing algorithm is suitable for such network architecture. When using multichannel and multi-interface, routing algorithm and channel assignment is codependent. They should be combined together to fully exploit the network capacity. We propose...
A universal classifier synchronizer and demodulator (UCSD) is conceived as a self-contained system which forms the heart of a truly cognitive receiver. It can automatically interpret features of the received signal to accomplish physical layer classification, synchronization and demodulation without any priori information about the waveform from the transmitter side. In this paper we propose a cognitive...
This paper introduces important cognitive radio developments like spectrum sharing, learning and adaptation algorithms, and the software and hardware architecture to support these functions. A cognitive radio is defined here as a transceiver that is aware of its environment and can combine this awareness with knowledge of its user's priorities, needs, operational procedures, and governing regulatory...
Algebraic soft-decision decoding [4] is a recent breakthrough in decoding of Reed-Solomon codes and it achieves significant decoding gain over conventional hard-decision decoding. In the bivariate polynomial factorization step of the new decoding algorithm, solving polynomial equations is required and it may contribute to a significant portion of the overall decoding latency. In this paper, we present...
This paper presents an FPGA implementation of a high-speed interpolation processor for algebraic soft-decision decoding of Reed-Solomon codes. In the design, pipelining and parallel processing techniques are exploited to increase the decoding throughput. In addition, different parts of the interpolation processor are properly scheduled to achieve maximum overlap in processing time for the computations...
Algebraic soft-decision decoding [4] is a recent breakthrough in decoding of Reed-Solomon codes and significant decoding gain can be achieved over conventional hard-decision decoding. Bivariate polynomial factorization is an important step of the new decoding algorithm and contributes to a significant portion of the overall decoding latency. In this paper, a novel architecture based on direct root...
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