Anti-multiaddress interfering direct sequence spread spectrum communication system
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A direct sequence spread spectrum, communication system technology, applied in the field of direct sequence spread spectrum wireless communication, can solve the problems of newly added users unable to receive correct information, total interference value exceeding, and high multiple access interference
Inactive Publication Date: 2008-08-27
HARBIN INST OF TECH
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[0003] The present invention aims to solve the problem that when new users are added in the overlapping area of base station coverage, the total interference value received by the system exceeds the interfer
Method used
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specific Embodiment approach 1
[0030] Embodiment 1: This embodiment is described in conjunction with FIG. 1a and FIG. 1b. The transmitter of the anti-multiple access interference direct sequence spread spectrum communication system of this embodiment is composed of the following parts:
[0031] The serial / parallel converter 1 is used to divide the original information data into I and Q two-way signals, and send the two-way signals to the first frequency spreader 6 and the second frequency spreader 7 respectively;
[0032] The first frequency spreader 6 and the second frequency spreader 7 are used to spread the I and Q signals respectively, and send them to the first binary frequency modulator 8 and the second binary frequency modulator respectively 10;
[0033] The first pseudo-random code generator 2 and the second pseudo-random code generator 3 are used to generate different pseudo-random code sequences, which are sent to the first frequency spreader 6 and the second frequency spreader 7;
[0034] The mu...
specific Embodiment approach 2
[0052] Specific embodiment two: in conjunction with Fig. 1a, Fig. 1b and figure 2 This embodiment is described. In this embodiment, it is assumed that there are three users A1, B1, and C1 in the overlapping coverage area of the three base stations A, B, and C, and the users A1, B1, and C1 communicate with the three base stations A, B, and C respectively. At this time, user A2 joins, and A2 communicates with base station A. Calculate as follows by multiple access interference calculation module 11:
[0053] The signal transmitted by base station A to user A1 is:
[0054] S A1 (t)=S A1I (t)+S A1Q (t)
[0055] in
[0056] S A1I (t)=A 1 d A1I (t-τ A1I )PN A1I (t-τ A1I )cos(2πf c t+φ A1 )
[0057] S A1Q (t)=A 1 d A1Q (t-τ A1Q )PN A1Q (t-τ A1Q )sin(2πf c t+φ A1 )
[0058] S in the formula A1I (t) is the channel I signal of A1 user, S A1Q (t) is the Q channel signal of A1 user, A 1 is the magnitude, d A1I (t-τ A1I ) is the I road information data, d A1...
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Abstract
Disclosed is a direct sequence spread spectrum communication system which resists the multiple access interference and relates to the direct sequence spread spectrum wireless communication field, aiming at solving the problems that the multiple access interference is high and the new user can not receive the correct information. A multiple access interference computation module (11) is added to the transmitter of the direct sequence spread spectrum communication system in the prior art for figuring out the initial phase value; the computed initial phase value is transmitted to a first initial phase generator (12); the first initial phase generator (12) is used for generating the initial phase, receiving the initial phase parameter computed by the multiple access interference computation module (11) and sending the initial parameter to a first carrier generator (13); a second initial phase generator (17) is added to the receiver of the direct sequence spread spectrum communication system in the prior art for generating the initial phase parameter the same as the initial phase parameter generated by the first initial phase generator in the transmitter and sending the initial phase parameter to a second carrier generator (18). Compared with the direct sequence spread spectrum communication in the prior art, the direct sequence spread spectrum communication system which resists the multiple access interference improves the system capacity; the implementation method is simple and effective.
Description
technical field [0001] The present invention relates to the field of direct-sequence spread spectrum wireless communication, in particular to the method of reducing the multiple-access interference of newly added users in overlapping coverage areas of other base stations on the premise of not increasing the multiple-access interference of existing users in direct-sequence spread spectrum communication device. Background technique [0002] The transmitting end of the spread spectrum communication system modulates the information data to be transmitted by a pseudo-random code (spreading sequence) to achieve spectrum expansion before transmission, and the receiving end uses the same code for demodulation and related processing to restore the original information data. This communication method is opposite to the common narrowband communication method. After spreading the spectrum, broadband communication, and then correlation processing restores the narrowband to demodulate the...
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