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multi-level modulation
Vertaling van "multi-level modulation" in Japans
多値変調
The effect of increased data volume due to error correction and repetition is reduced by the increased transmission speed obtained by multi-level modulation, and the sensitivity can be improved even though the effective transmission speed is the same as the conventional method.
そして多値変調で得られた通信速度の向上分で、エラー訂正や繰り返しなどによるデータ 量増加の影響を軽減し、結果として、実効通信速度を従来と同じにしても感度を向上させることが可能で す。
A demodulator includes: a first specification unit for specifying a received signal point on the basis of a multi-level modulation signal; a second specification unit for specifying a likelihood of the value of a specific bit, the hard decision boundary on a signal plane of the bit being parallel to one of two axes of the plane among a plurality of data bits specified from the received signal point, on the basis of a distance between the received signal point and the boundary of the specific bit; a decoding unit for performing soft-decision decoding using the likelihood with regard to the value of the specific bit; and a third specification unit for specifying, from among a plurality of modulation signal points, a plurality of candidate signal points corresponding to candidate data having the value of the decoded specific bit among data corresponding to each of modulation signal points, and specifying the value of a bit other than the specific bit by using data correlated with a candidate signal point from which the distance to the received signal point is shortest.
復調装置は、多値変調信号に基づき受信信号点を特定する第１特定部と、受信信号点から特定されるデータの複数のビットのうち、信号平面での硬判定境界が該平面の２軸の一方と平行な特定ビットの値の尤度を、受信信号点と該特定ビットの境界との距離に基づき特定する第２特定部と、特定ビットの値について該尤度を用いて軟判定復号する復号部と、複数の変調信号点の中から、変調信号点の各々に対応するデータのうち復号された特定ビットの値を有する候補データに対応する複数の候補信号点を特定し、受信信号点までの距離が最も短い候補信号点に対応づけられたデータを用いて、特定ビット以外のビットの値を特定する第３特定部と、を含む。
The signal quality required for multi-level modulation of 16-QAM has been achieved by using a lower-order multiplication technique and combining many stages of amplifier circuits and the built-in higher-harmonic-suppressing filter.
逓倍数［用語2］を下げた構成とし、多段の増幅回路と内蔵の高調波抑圧フィルタを組み合わせることで、16 QAM［用語3］の多値変調に必要な信号品質を達成している。
DMT divides the data into multiple subcarriers (carrier waves), and multi-level modulation is used for each subcarrier to achieve high transmission speeds (Figure 2).
DMT技術はデータを多数のサブキャリア（搬送波）に分割し、それぞれのサブキャリアに多値変調を用いることで高速伝送を実現するという特長があります（図2 ） 。
Amendment History Ver. Amendment or Enactment Date Amendment summary 2.0 03.17.2015 This Standard shall be revised in Ver..0 for widening of the occupied frequency band, the addition of the orthogonal frequency-division multiplexing method, the addition the multi-level modulation method and the modification of measurement method for the implementation of enlarging transmission capacity with considering the purpose of utilization as the entrance link and backhaul in LTE, etc. mobile communication system in accordance with the regulation maintenance by Ministry of Internal Affairs and Communications (Notification No. 83, 1991).
改定の概要 版数 策定又は改定日 改定の概要 2.0版 2015.03.17 総務省における制度整備（総務省告示第83号、平成3年）に対応し、LTE等移動通信システムのエントランス回線やバックホールとしての利用を目的とした伝送容量の大容量化実現のため、利用周波数帯の広帯域化及び直交周波数分割多重方式及び多値変調方式の追加、測定法に関する変更を行うものである。
A signal processing means, comprising: a carrier compensation means that generates two carrier compensation signals for two polarization signals, by compensating phase difference and frequency difference between signal light and local light; a symbol determination means that demodulates the two carrier compensation signals according to a signal arrangement for multi-level modulation; a symbol rough determination means that demodulates the two carrier compensation signals according to a signal arrangement having a reduced number of levels for multi-level modulation; a selection means that selects either the output from the symbol determination means or the output from the symbol rough determination means; and a coefficient setting means that refreshes a filter coefficient for a polarization-separation means, using the output selected by the selection means.
信号処理手段は、２つの偏波信号について、信号光と局所光の位相差及び周波数差を補償することにより、２つのキャリア補償信号を生成するキャリア補償手段と、２つのキャリア補償信号を、多値変調の信号配置に従って復調するシンボル判定手段と、２つのキャリア補償信号を、多値変調の多値数を減らした信号配置に従って復調するシンボル概判定手段と、シンボル判定手段の出力とシンボル概判定手段の出力の一方を選択する選択手段と、選択手段が選択した出力を用いて、偏波分離手段のフィルタ係数を更新する係数設定手段と、を備える。
Up until now, however, compensating for the nonlinear optical effects of multi-level modulation signals within the optical fiber was difficult because the extremely large scale of the circuit made circuit implementation difficult.
しかしながら、これまで多値変調信号が受ける光ファイバ中の非線形光学効果を補償する回路は規模が非常に大きく回路実装が困難であるという課題があり、長距離化の主要制限要因となっていました。
The optical transmitter comprises: a mapping unit for mapping the data sequence and converting the data sequence into multi-level data on the basis of multi-level modulation information indicating the multiple levels for the modulation; a D/A converter for converting the multi-level data output from the mapping unit into an analog signal; an optical modulator which is driven on the basis of an analog signal output from the D/A converter and modulates the light from the light source; and a bias control unit for setting a control polarity for DC bias control in the optical modulator on the basis of the multi-level modulation information.
Synoniemen voor multi-level modulation in het Engels
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