This document provides updates to IEEE Std 802.16's MIB for the MAC, PHY and asso- ciated management procedures in order to accommodate recent extensions to the standard.

IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions

In-band full-duplex (IBFD) technology can enable unique system capabilities and network architectures by allowing devices to transmit and receive on the same frequency at the same time. While previously considered impossible, this ability can now be used to optimize resource sharing within the crowded frequency spectrum for various communication systems, including 5G new radio. The potential of these IBFD systems can only be realized if each device incorporates a sufficient number of self-interference cancellation techniques to ensure that its receivers do not saturate. This tutorial survey offers the most comprehensive collection to date of these techniques and discusses how all of them can be implemented within the different domains of a typical transceiver. In addition, the results of a novel IBFD system study are presented for more than 50 demonstrated communication systems with more than 80 different measurement scenarios. The various system parameters are then combined into a new figure of merit, which can be used to propel future research and accelerate the inclusion of IBFD technology within an upcoming wireless standard.

In-Band Full-Duplex Technology: Techniques and Systems Survey

Fast and reliable time and frequency synchronization is crucial for packet-based orthogonal frequency division multiplex (OFDM) systems. In this paper we compare and analyze preambles for OFDM systems based on repeated OFDM data symbols or repeated short pseudonoise sequences (PN-sequences). We make an analytical evaluation for AWGN channels and simulate the performance in oneand two-tap Rayleigh fading channels. The PN-based preamble gives better detection properties in terms of lower false detection probability and lower probability of missing the synchronization signal. The PN-based preamble has low peak-to-average power ratio and it makes it possible to use an ADC with one-bit quantization in stand-by mode. For frequency offset estimation both preambles give similar performance, but the PN-based preamble allows for a greater reduction in stand-by mode power consumption.

Time and Frequency Synchronization for BRAN using PN-sequence Preambles

A block-request streaming system provides for improvements in the user experience and bandwidth efficiency of such systems, typically using an ingestion system that generates data in a form to be served by a conventional file server (HTTP, FTP, or the like), wherein the ingestion system intakes content and prepares it as files or data elements to be served by the file server, which might or might not include a cache. A client device can be adapted to take advantage of the ingestion process as well as including improvements that make for a better presentation independent of the ingestion process. In the block-request streaming system, the an ingestion system generates data according to erasure codes and the client device, through various selection and timing of requests for media data and redundant data, can efficiently decode media to provide for presentations.

Enhanced block-request streaming using cooperative parallel HTTP and forward error correction

The embodiments described herein methods and devices that enhance the endurance of a non-volatile memory (e.g., flash memory). The method includes obtaining, for each of the plurality of die, an endurance metric. The method also includes sorting the plurality of die into a plurality of die groups based on their corresponding endurance metrics, where each die group includes one or more die and each die group is associated with a range of endurance metrics. In response to a write command specifying a set of write data, the method further includes writing the write data to the non-volatile memory by writing in parallel subsets of the write data to the one or more die assigned to a single die group of the plurality of die groups.

Device and method for managing die groups

The next-generation wireless systems are expected to support data rates of more than 100 Mbps in the outdoor environment. In order to support such large payloads, the polarized antenna can be employed as one of candidate technologies. Recently, the third generation partnership standards bodies (3GPP/3GPP2) have defined a cross-polarized channel model in SCM-E for MIMO systems, but this model is quite complex and too many parameters are included. The SCM-E channel model generates only single channel output for each time instant, therefore it is not so appropriate to apply the SCM-E channel model directly to MIMO spatial multiplexing or receive combining systems. In this paper, we provide practical but simple dual-polarized channel models, which take into account both cross-polarization discrimination (XPD) and Rician K-factor. We verify the proposed channel model by observing the XPD and correlation values among polarized channels. In addition, BER & PER performances and system throughput using MRC and EGC combining at Rx side are simulated in this paper. The simulation results show the dramatically increased system throughput by the adoption of dual-polarized antenna.

SISO polarized flat fading channel modeling for dual-polarized antenna systems

The present invention relates to a method for automatic gain control (AGC) before an initial synchronization of a mobile station modem in OFDM system, and an apparatus thereof. The AGC apparatus includes: an initial synchronization inspector that verifies whether an initial synchronization for an input block sample (k) signal has been performed; a frame divider that divides a frame into predetermined intervals B(k) for the input block sample(k) signal in the case that the initial synchronization has not been performed; a reference value inspector that compares a difference value Pref-Pcalc, between a predetermined reference value Pref and sample data average energy Pcalc, with a predetermined value; a count controller that increases or decreases the count when the difference value Pref-Pcalc compared by the reference value inspector is greater or less than the predetermined value; a count inspector that inspects whether the count is greater or less than 0 when the input block sample (k) reaches a maximum value MAX; and a gain controller which increases or decreases the gain, level by level, according to the count inspection result of the count inspector.

Method for automatic gain control before initial synchronization in ofdm system and apparatus thereof

A simple detector named QR-LRL for MIMO systems was proposed in [7] and it was shown that QR-LRL approached the hard-output ML performance. However, its soft-output performance is not capable of approaching the near ML performance. In this letter, we propose a novel detection method which can generate reliable soft-outputs while avoiding the empty vector set problem. The proposed detector efficiently uses the upper triangular structure in QR decomposition. Simulation results show that the proposed detector can approach the near soft-output ML performance as well as hard-output with feasible complexity.

Efficient Soft-Output Generation Method for Spatially Multiplexed MIMO Systems

A cell search device using an appropriate preamble for a downlink of a cellular system using an orthogonal frequency division multiplexing access (OFDMA) scheme and a method thereof is disclosed. The cell search device for a terminal of a cellular system using an orthogonal frequency division multiplexing access scheme includes when the terminal receives a preamble symbol from a base station, a PN code and phase delay estimating unit for generating a code with the received preamble symbol and a combination of a PN code and a Walsh code, calculating a correlation value therebetween using a differential demodulation for the codes to detect the PN code, a plurality of Walsh codes, and an error of a time delay, and estimating a component of a phase delay for the time delay; and a Walsh code estimating unit for minimizing the influence of the time error using the phase delay and the PN code information obtained by the differential demodulation of the PN code and phase delay estimating unit and estimating a Walsh code for the corresponding cell by synchronization demodulation.

Cell search device of cellular system using ofdma scheme and method thereof

This paper presents the implementation and performance of the OFDMA modulator based on the IEEE 802.16a standard. We present the bit-word length for subblocks of modulator to support the acceptable performance and lower complexity. To show the signal quality of transmit signal, the error vector magnitude (EVM) of designed modulator is simulated under ideal demodulation process. We also analyze the peak average power ratio (PAPR) characteristics of transmitted signal, which is almost same for any modulation schemes and the number of subchannels, but the probability distribution of transmitted signal varies depending on the number of subchannels.

Youn-Ok Park

Papers

SISO polarized flat fading channel modeling for dual-polarized antenna systems

Method for automatic gain control before initial synchronization in ofdm system and apparatus thereof

Efficient Soft-Output Generation Method for Spatially Multiplexed MIMO Systems

Cell search device of cellular system using ofdma scheme and method thereof

A design and performance analysis of OFDMA modulator based on IEEE 802.16a standard