Reduction of spectral leakage in OFDM system

Abstract

A resource block (RB)-based multicarrier modulation (MCM) transmitter and receiver structure for spectral agile systems are disclosed. The transmitter and the receiver are capable of sharing opportunistically available and non-contiguous channels with other users. The RB-MCM partitions the available spectrum, contiguous or non-contiguous, into multiple RBs (same or different sizes), applies a baseband MCM or single carrier modulation, or coded single carrier or multicarrier schemes in each RB with a type of spectral leakage reduction technique, and applies RB modulation for each RB to modulate the signal from baseband to the frequency band of that RB. At the receiver, the received signal may be filtered and RB demodulation may be applied to put each RB signal in baseband and a baseband multicarrier or single carrier or coded single carrier or coded multicarrier demodulation may be applied to each RB signal. Different RBs may use different modulation schemes.

Description

[0001] Cross References to Related Applications [0002] This application claims U.S. Provisional Application No. 61 / 731,356, filed November 29, 2012, U.S. Provisional Application No. 61 / 767,556, filed February 21, 2013, and U.S. Provisional Application No. 61 / 767,556, filed March 7, 2013 To the benefit of No. 61 / 774,452, the contents of which are hereby incorporated by reference. Background technique [0003] Multi-carrier modulation (MCM) techniques allow data sets to be transmitted over multiple narrowband subcarriers. By utilizing advanced wideband modulation and coding schemes, MCM systems can achieve higher spectral efficiency in frequency-selective channels than systems using single-carrier modulation techniques. [0004] Orthogonal Frequency Division Multiplexing (OFDM) is an example of an MCM technique used in a wireless communication system. OFDM divides the total bandwidth into multiple orthogonal sub-bands that overlap in frequency and can be efficiently implemen...

AI Technical Summary

Problems solved by technology

In practice, however, the large number of rectangular pulse sidelobes within OFDM creates challenging problems (including large amounts of intercarrier interference when the system is not fully synchronized), and there are too many out-of-band emissions (OOBE), which will Limiting the efficiency of OFDM in networks with dynamic channel access capabilities

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