Two-dimensional spread-spectrum based channel estimation method

Abstract

This invention provides a channel estimation method based on two-dimension spreading spectrum, which contains time domain receiver and frequency domain receiver receiving channel estimation method, using two-dimension spreading spectrum ideal processing one dimension spreading spectrum signal in time domain and frequency domain, fully utilizing the energy of receiving leading signal and reducing multiple route interference, dividing signal band width into many sub-band width less than relative band width to reduce the influence of channel frequency selectivity and raise the accuracy of channel estimation, said invention can be used for ime domain receiver and frequency domain receiver.

Description

technical field [0001] The invention belongs to the field of electronic technology, such as wireless communication, mobile communication, radar, electronic countermeasures, etc., and particularly relates to a wireless mobile communication system (such as: WCDMA, cdma2000, TD -SCDMA, etc.). Background technique [0002] Figure 1 summarizes the composition of the transmitter of the direct sequence spread spectrum signal without loss of generality: PN sequence generator module 1, multiplier 2, spread spectrum code generator module 3, adder module 4, local carrier 5, radio frequency processing 1 module 6 and transmitting antenna 7. [0003] Transmitter working process: information bit b(t) passes through multiplier module 2 and spread spectrum sequence element α generated by PN sequence generator module 1 n Multiply (α n The chip rate is T c , the original information bit rate is T, and T / T c =N, N is exactly the processing gain of direct sequence spread spectrum, 1≤n≤N), t...

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Problems solved by technology

[0013] (1) The above-mentioned method 1: multi-slot weighted average method, method 2: wavelet base extension method, and method 4: polynomial interpolation method, these methods require guidance data of multiple time periods, and the estimation accuracy is not enough in a rapidly changing channel ;

[0014] (2) In the above-mentioned methods, all channel estimations are carried out in the time domain. In the frequency selective channel, since the responses of each frequency in the channel are different, these methods are not accurate enough in frequency selective channel estimation;

[0015] (3) The calculation of the above-mentioned various methods is cumbersome and the complexity is high;

[0016] (4) The above-mentioned various methods are applicable to various time-domain receivers, such as: time-domain direct-sequence spread spectrum signal time-domain direct receiver, time-domain direct-sequence spread-spectrum signal time-domain Rake (RAKE) receiver, these The channel estimation method is not suitable for frequency domain receivers, such as: time domain direct sequence spread spectrum signal frequency domain equivalent reception, a new receiving method of direct sequence spread spectrum signal (patent: inventor: Tang Youxi Shao Shihai, patent application number : 200410022547.8)

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