图3 发送通路Fig.3 Transmitter diagram 接收通路如图4所示,接收通路分为两路,一路通过天线将接收到的信号进行放大,下变频到基带,进行滤波后转换为数字信号,主要包括低噪声放大器、下变频混频器、滤波器和模数转换器等部件;另一路通过电力线将接收到的信号放大和滤波后转换为数字信号,主要包括两级自动增益放大器、滤...
These complex source symbols are treated by the transmitter as though they are in the frequency-domain and are the inputs to an IFFT block that transforms the data into the time-domain. The IFFT takes in N source symbols at a time where N is the number of subcarriers in the system. ...
interleaving, and convolutional encoding purposes. These parameters are shared between the transmitter and receiver. The system uses a 7th-degree scrambler polynomial, interleaving depth of 12 for header data and 18 for payload data, a base convolutional coding rate of 1/2, and...
The simulink model simulates the fixed-point and latency behavior and generates HDL code.A block diagram of the transmitter design is shown.A block diagram of the receiver design is shown.This example is part of a related set of examples for custom OFDM communication systems. For more ...
1. Block diagrams of DCO-OFDM scheme: (a)-transmitter, (b)-receiver. An optical power efficient alternative to DCO-OFDM is ACO-OFDM [8] where data are carried and mapped to only the odd IFFT subcarriers inputs with all the even inputs set to zero. The resulting bipolar signal at ...
Concepts of Orthogonal Frequency Division Multiplexing (OFDM) and 802.11 WLAN It’s important to have a fundamental understanding of Orthogonal Frequency Division Multiplexing (OFDM) because this technology is a basic building block for many of the current modulation schemes including; 802.11WLAN, 802.16...
The sample rate after the Vector Decimator block is 61.44 Msps, as expected by OFDM TxRx subsystem for its processing. The OFDM TxRx subsystem contains the functionality to be implemented on the PL. This subsystem contains an OFDM Transmitter and an OFDM Receiver connected back-to-back. This ...
An Orthogonal Frequency Division Multiplexer (OFDM) transmitter and receiver apparatus consistent with certain embodiments of the present invention receives data to be transmitted and maps (204) a first portion of the data to a first polarization state and a second portion of the data to a second...
switching time requirements can be very stringent (less than 100 ps) at both the transmitter and receiver; the receiver signal processing is very sensitive to group delay variations introduced by analog front-end components; and spectral resources are potentially wasted in order to avoid narrowband ...
To receive a particular signal, the receiver needs to know the signature sequence for that user in order to align the carrier phases for the coherent combining operation. Figure 2.1 is a block diagram of an OFDM-SS transmitter/receiver pair. As shown in the figure, carrier generation is ...