Consider a 16-QASK signal v_vs (t) k_1 u_1(t) + k_2 u_2(t) where k_1, k_2 elemen

Question

Consider a 16-QASK signal v_vs (t) k_1 u_1(t) + k_2 u_2(t) where k_1, k_2 elementof {0, 2, 4, 6}, u_1(t) = squareroot 2/T_s, cos omga_0 t, u_1(t) = squareroot 2/T_s sin omega_0 t with T_s = 4 seconds. Draw the symbols in the 2-dimensional signal space defined by u_1(t), u_2(t); Determine the DC component and the average symbol energy; Determine the symbol distance, bit interval, bit rate, and bandwidth; Design another 16-QASK system that most efficiently utilizes the energy and achieves the same performance of the given system. Draw the symbols of your designed system in the 2-dimensional signal space.

Explanation / Answer

DDL (Data Definition Language) is used to define data structures stored in the database. DDL statements allow to create, modify or destroy individual database objects. Object types allowed depend on the DBMS used, and usually include databases, users, tables and some smaller housekeeping objects like roles and indexes. DML (Data Manipulation Language) is used to query and change data stored in the database. DML statements allow to select, insert, update and delete data in the tables. Sometimes pure select statements are not classified as part of DML, since they don’t change the state of the data. All SQL DML statements are declarative. DCL (Data Control Language) is used to control access to data stored in the database. DCL statements operate with privileges and allow to grant and revoke privileges on applying certain DDL and DML commands to certain database objects. TCL (Transaction Control Language) is used to control processing of transactions in the database. Usual TCL statements are commit to apply the changes introduced by the transaction, rollback to undo them and savepoint to divide the transaction into several smaller parts

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