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Ofdma Transmitter and Receiver Based on Segmented Spread Spectrum

A segmented, transmitter technology, applied in the field of communication networks, can solve problems such as inability to fully utilize spectrum fragments, lack of expansion gain, etc.

Active Publication Date: 2017-07-21
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, pure OFDMA transceivers cannot fully utilize the underutilized spectrum fragments due to the lack of spreading gain

Method used

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  • Ofdma Transmitter and Receiver Based on Segmented Spread Spectrum
  • Ofdma Transmitter and Receiver Based on Segmented Spread Spectrum
  • Ofdma Transmitter and Receiver Based on Segmented Spread Spectrum

Examples

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Embodiment Construction

[0050] The PSS-OFDMA transceiver of the present invention can be applied to, for example, a DSA network. It introduces multiple independent circular convolutions with variable lengths, so as to expand multiple independent symbol sub-streams on different underused aggregation sub-bands respectively. Each circular convolution calculation is performed between a complex quadratic sequence and a symbol substream, wherein the length of the symbol substream is set to not exceed the length of the complex quadratic sequence to obtain spreading gain. Typically, the symbol substreams are compensated for multiple zeros to have a length consistent with the length of the complex quadratic sequence. The output symbols of each circular convolution are transmitted on a reusable subband, which may consist of contiguous or non-contiguous subcarriers, where each subcarrier is assigned to a symbol. In particular, with the help of a well-designed complex quadratic sequence, the output symbol of ea...

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Abstract

The present invention provides an adaptive PSS-OFDMA transmitter and receiver. Compared with the existing OFDMA transmitter, a segmented spread spectrum module is added, which includes a data mapping unit, which is used to perform data mapping on the serial data stream according to the data mapping criteria and adaptive parameters, and generate K parallel symbol sub- The stream segmented spreading unit is used to perform independent spread spectrum processing on each of the K parallel symbol substreams to generate K spread parallel symbol substreams and a subcarrier mapping unit for adaptive The permutation matrix P in the parameter performs subcarrier mapping on the K spread-spectrum parallel symbol substreams to generate N subcarrier-mapped parallel symbols s'=[s'[0] s'[1] ... s' [N‑1]]T. The added segmented spread spectrum and despread module uses a non-binary sequence to perform spread spectrum processing on subbands of arbitrary length, so it can adaptively meet the requirements of the dynamic stepped spectrum mask, thereby improving the dynamic spectrum. Reuse efficiency of underused spectrum fragments in access systems.

Description

technical field [0001] The present application relates to a communication network, in particular to an adaptive segmented spread spectrum (piece-wise spread spectrum, PSS) orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA) transmitter in a dynamic spectrum access communication network and receiver. Background technique [0002] Dynamic spectrum access (dynamic spectrum access, DSA) is to deal with the increasingly serious spectrum congestion problem from the perspective of changing the spectrum allocation mode. In order to fully utilize those underutilized frequency bands, the dynamic spectrum access network with hierarchical layering allows spectrum underlay, so that the transceivers with cognitive functions can both detect and utilize those underutilized frequency bands. frequency band while limiting its interference strength to a certain spectrum mask imposed by the primary system. With the emergence of LTE, WiMAX, WiFi ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L5/00H04L25/03H04L1/00H04B1/71
Inventor 郭海友
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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