A 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 the problems of transmitter power efficiency reduction, peak level height, etc.

Inactive Publication Date: 2020-08-04
ARMY ENG UNIV OF PLA
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  • 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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  • A Multi-ary Spread Spectrum Ofdm Modulation Method Based on Orthogonal Complementary Sequence Set
  • A Multi-ary Spread Spectrum Ofdm Modulation Method Based on Orthogonal Complementary Sequence Set
  • A 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, select the subsequence length given in [1] to construct a subsequence of 2 n +1=33 zero-centered complementary pairing sets, so that 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 the unloaded DC subcarrier of OFDM modulation.

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

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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 communication field, in particular to a multi-ary system spread spectrum OFDM modulation method based on an orthogonal complementary sequence set. Background technique [0002] Multi-ary spread spectrum can achieve an optimized balance between transmission rate and processing gain, so it is suitable for communication systems with limited frequency bands and certain requirements for transmission rate. Compared with the traditional direct-sequence spread spectrum method, the multi-ary system spread spectrum obtains a higher data rate by sacrificing a certain processing gain. [0003] Multi-ary spread spectrum can simultaneously map n information bits to 2 n When despreading, use the excellent correlation performance of the spreading sequence to detect the corresponding information bit. Then, the number of spread spectrum sequences is the main factor restricting the transmission rate of the system. The larger the number of s...

Claims

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Application Information

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Patent Type & Authority Patents(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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