主要内容

comm.DBPSKDemodulator

Demodulate using DBPSK method

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Description

Thedbpskdemodulatorobject demodulates a signal that was modulated using the differential binary phase shift keying method. The input is a baseband representation of the modulated signal.

那是解调信号modulated using differential binary phase shift keying:

  1. Define and set up your DBPSK demodulator object. SeeConstruction。

  2. Callstepto demodulate a signal according to the properties ofcomm.DBPSKDemodulator。The behavior ofstepis specific to each object in the toolbox.

Note

Starting in R2016b, instead of using thestep执行由System Object™定义的操作的方法，您可以使用参数调用对象，就像它是一个函数一样。例如，y = step(obj,x)和y = obj(x)perform equivalent operations.

Construction

h = comm.dbpskdemodulator.创建解调器系统对象，H。该对象使用差分二进制相移键控（DBPSK）方法解调输入信号。

h = comm.dbpskdemodulator.(Name,价值)creates a DBPSK demodulator object,H，每个指定属性设置为指定值。您可以以任何顺序指定其他名称值对参数（Name1,价值1,...,NameN,价值N).

h = comm.dbpskdemodulator（阶段，Name,价值)creates a DBPSK demodulator object,H。This object has thePhaseRotationproperty set to阶段和the other specified properties set to the specified values.

Properties

PhaseRotation

额外的相移

Specify the additional phase difference between previous and current modulated bits in radians as a real scalar. The default is0。This value corresponds to the phase difference between previous and current modulated bits when the input is zero.

OutputDataType

数据类型输出

Specify output data type as one ofFull precision|Smallest unsigned integer|double|single|int8|uint8|INT16|uint16|int32|uint32|logical。The default isFull precision。When you set this property toFull precision, the output data type has the same data type as the input. In this case, that value must be a double- or single-precision data type.

方法

step Demodulate using DBPSK method
Common to All System Objects
release

Allow System object property value changes
reset

Reset internal states of System object

Examples

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打开直播脚本

Create a DBPSK modulator and demodulator pair.

dbpskmod = comm.DBPSKModulator(pi/4); dpbpskdemod = comm.DBPSKDemodulator(pi/4);

创建错误率计算器。设定计算delay.property to1to account for the one bit transient caused by the differential modulation

errorRate = comm.ErrorRate('ComputationDelay',1);

Main processing loop steps:

  • Generate 50-bit frames

  • DBPSK modulate

  • Pass through AWGN channel

  • DBPSK demodulate

  • Collect error statistics

forcounter = 1:100 txData = randi([0 1],50,1); modSig = dbpskmod(txData); rxSig = awgn(modSig,7); rxData = dpbpskdemod(rxSig); errorStats = errorRate(txData,rxData);end

Display the error statistics.

ber = errorStats(1)
ber = 0.0040
numErrors = errorStats(2)
numErrors = 20
numbits = errorstats（3）
numbits = 4999.

Algorithms

This object implements the algorithm, inputs, and outputs described on theDBPSK Demodulator Baseband块参考页面。对象属性对应于块参数。

Extended Capabilities

See Also

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Introduced in R2012a

Communications Toolbox Documentation

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Bridging Wireless Communications Design and Testing with MATLAB

Bridging Wireless Communications Design and Testing with MATLAB

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