Method and device for estimating ratio of average chip energy to total transmit power spectrum density

A method for estimating a ratio of average chip energy to a total transmit power spectrum density (Ec/Ior), comprising:

• according to a group of spreading codes corresponding to an acquired spreading factor (SF), obtaining an estimated value of a total transmit power spectrum density (Ior);
• according to a spreading code of a physical channel to be estimated, obtaining an estimated value of average chip transmit energy (Ec);
• and
• according to the estimated value of the Ior and the estimated value of the Ec, obtaining an estimated value of Ec/Ior;
• according to a protocol that is corresponding to a communication system, obtaining an SF value, wherein the SF value is greater than or equal to a minimum SF value of a common channel, wherein the minimum SF value of the common channel is specified by the protocol;
• wherein the obtaining the estimated value of the Ior according to the group of spreading codes corresponding to the acquired SF comprises:
• according to the group of spreading codes corresponding to the acquired SF, despreading signals on at least one path to obtain a group of first despreading values;
• and
• performing secondary moment estimation and summation on the group of first despreading values to obtain an estimated value of Ior, wherein the performing secondary moment estimation and summation on the group of first despreading values to obtain the estimated value of the Ior comprises:
• performing secondary moment estimation and summation according to the group of first despreading values to obtain a biased estimated value of the Ior;
• or
• performing secondary moment estimation and summation according to the group of first despreading values to obtain a biased estimated value of the Ior;
• and according to the biased estimated value of the Ior and a sum of interference signal energy of more than one physical channels, obtaining an unbiased estimated value of the Ior;
• wherein the despreading the signals on the at least one path to obtain the group of first despreading values according to the group of spreading codes corresponding to the acquired SF comprises:
• according to the group of spreading codes corresponding to the acquired SF, despreading signals on a path with the highest receiving power to obtain the group of first despreading values;
• the performing secondary moment estimation and summation according to the group of first despreading values to obtain the biased estimated value of the Ior comprises:
• according to
• Ior
• ′
• =
• 1
• M
• ⁢
• ∑
• k
• =
• 0
• M
• -
• 1
• ⁢
• ⁢
• ∑
• n
• =
• 1
• L
• /
• M
• ⁢
• ⁢
• A
• chscr
• ,
• M
• ,
• k
• ,
• l
• ,
• n
• 2
• ,
• calculating a biased estimated value of the Ior, wherein Ior′ is a biased estimated value of the Ior, Achscr,M,k,l,n is a group of first despreading values, chscr is a despreading channel identifier, M is an SF value, k is a serial number of a spreading code, wherein k =0, 1, 2, . . . , and (M−1), l is a serial number of the path with the highest receiving power, n is a serial number of a symbol sequence that is used for despreading, L is the number of chips required for single estimation of the Ior, and L is a positive integral multiple of M;
• and
• the obtaining the unbiased estimated value of the Ior according to the biased estimated value of the Ior and the sum of interference signal energy of more than one physical channels comprises:
• according to Ior*=Ior′−L×Pnoise,chip,1 calculating an unbiased estimated value of the Ior, wherein Ior* is an unbiased estimated value of the Ior and Pnoise,chip,1 is chip-level interference signal energy of an acquired path with the highest receiving power.