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Multi-ary spread spectrum OFDM modulation method based on orthogonal complementary sequence set

A modulation method and orthogonal sequence technology, applied in the field of communication, can solve problems such as high peak level and low transmitter power efficiency

Inactive Publication Date: 2019-04-12
ARMY ENG UNIV OF PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the peak-to-average ratio of OFDM modulation is high, which directly leads to the reduction of transmitter power efficiency

Method used

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  • Multi-ary spread spectrum OFDM modulation method based on orthogonal complementary sequence set
  • Multi-ary spread spectrum OFDM modulation method based on orthogonal complementary sequence set
  • Multi-ary spread spectrum OFDM modulation method based on orthogonal complementary sequence set

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Embodiment 1

[0025] Assume that the bandwidth limitation and transmission rate of the system require a spreading sequence length of 2 n =32, ie n=5. Then, the length of the subsequence given by Construct 1 in the literature [1] is 2 n +1=33 zero-centered complementary pairing set, let all the first subsequences of the first 32 pairs in the set form the in-phase component binary orthogonal sequence set As shown in formula (1). Let all the second subsequences of the first 32 pairs in this set form the set of orthogonal component binary orthogonal sequences As shown in formula (2). in, The symbol "+" means "1", the symbol "-" means "-1", and the elements in the middle of each sequence satisfy and Corresponds to OFDM modulated no-load DC sub-carriers.

[0026] The two sequence sets S with a length of 33 selected I and S Q are sets of orthogonal sequences, and all 32 sequences in each set satisfy the mutual orthogonality between any two sequences, such as figure 2 shown. fig...

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Abstract

The invention discloses a multi-ary spread spectrum OFDM modulation method based on an orthogonal complementary sequence set, related to the field of communication. Through selecting an orthogonal sequence of 2n in length preferably to form an OFDM modulated complex signal by combining, the mapping of 2n binary data bits can be realized; and the signal after demodulation of a receiving end of thesystem uses the orthogonal performance among the sequences to obtain the best detection and decision; therefore, the transmission rate of the system is greatly improved under the premise of ensuring the bit error rate performance. In addition to the orthogonal performance, the designed complex sequence has a lower peak-to-average ratio, so that the power amplifier efficiency of the OFDM modulationsystem transmitter can be effectively utilized.

Description

technical field [0001] The invention relates to the field of communications, in particular to a multi-ary spread spectrum OFDM modulation method based on a set of orthogonal complementary sequences. Background technique [0002] Multi-ary spread spectrum can achieve an optimal balance between transmission rate and processing gain, so it is suitable for communication systems with limited frequency bands and certain requirements for transmission rates. Compared with the traditional direct-sequence spread spectrum method, the multi-level spread spectrum can obtain a higher data rate by sacrificing a certain processing gain. [0003] Multi-ary spread spectrum can simultaneously map n information bits to 2 n For a certain one of the spread spectrum sequences, the excellent correlation performance of the spread spectrum sequences is used to detect the corresponding information bits during despreading. Then, the number of spreading sequences is the main factor restricting the tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B1/707H04L27/26
CPCH04B1/69H04B1/707H04L27/262H04L27/2627
Inventor 张振宇李晓毅赵有华刘晨润彭天佐曾凡鑫宣贵新陈嘉成
Owner ARMY ENG UNIV OF PLA
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